And Group Viii Metal Containing (i.e., Iron Or Platinum Group) Patents (Class 502/207)
  • Patent number: 4956326
    Abstract: A catalyst for dehalogenation of a halide comprising a corrosion-resistant ceramic or graphite having a surface area of 5.0 m.sup.2 /g or less and, supported thereon, at least one of a platinum group metal and a silicide thereof, and a method of dehalogenation of a halide using this catalyst.
    Type: Grant
    Filed: July 10, 1987
    Date of Patent: September 11, 1990
    Assignees: Chiyoda Chemical Engineering & Construction Co., Ltd., Nippon Kokan Co., Ltd.
    Inventors: Noriyuki Yoneda, Toshiji Makabe, Jun Kaita, Munekazu Nakamura, Yoshiko Endoh, Hidehiko Kudoh, Shunji Higashi
  • Patent number: 4912081
    Abstract: Compositions comprising boron-promoted reducible metal oxides (especially reducible oxides of Mn) containing alkali and alkaline earth metal components are disclosed, as well as use thereof for hydrocarbon conversions characterized by formation of by-product water. Particular processes comprise the conversion of methane to higher hydrocarbons and the dehydrogenation of dehydrogenatable hydrocarbons, e.g., dehydrogenation of C.sub.2 -C.sub.5 alkanes to form the corresponding olefins.
    Type: Grant
    Filed: February 2, 1989
    Date of Patent: March 27, 1990
    Assignee: Atlantic Richfield Company
    Inventors: John A. Sofranko, Robert G. Gastinger, C. Andrew Jones
  • Patent number: 4895822
    Abstract: Hydrocracking catalysts are disclosed which comprise specified amounts of selected inorganic oxides and specified amounts of selected metal components carried thereon. The carrier is essentially derived from solid-phase modification with specified amounts of a selected class of fluorine compounds. Mineral oils are selectively processable with high catalytic activity and at maximum yield.
    Type: Grant
    Filed: April 25, 1988
    Date of Patent: January 23, 1990
    Assignee: Nippon Oil Co., Ltd.
    Inventors: Hajime Okazaki, Michiaki Adachi, Masaru Ushio
  • Patent number: 4895821
    Abstract: This invention relates to a process for the manufacture of catalysts for the reduction of nitrogen oxides in exhaust gases or for chemical air cleaning processes, in which catalyst moldings are produced from iron oxide or mixtures of iron oxide and chromium oxide and/or manganese oxide, which are reduced to grain sizes less than 2 mm, with the use of inorganic binders and sulfuric acid, and with the possible addition of activating additives.
    Type: Grant
    Filed: August 12, 1988
    Date of Patent: January 23, 1990
    Assignees: Didier-Werke AG, Didier Engineering GmbH
    Inventors: Hartmut Kainer, Eugen Buhler, Daniel Grimm, Wilfried Schenelle, Claus Flockenhaus, Karl-Heinrich Laue, Klaus Merkel
  • Patent number: 4871706
    Abstract: Disclosed is the reaction of C.sub.3 to C.sub.4 paraffins with O.sub.2 and NH.sub.3 to make .alpha.,.beta.-unsaturated nitriles and olefins, using certain complex metal oxide catalysts containing V, Sb, W and certain optional elements.
    Type: Grant
    Filed: December 16, 1987
    Date of Patent: October 3, 1989
    Assignee: The Standard Oil Company
    Inventors: James F. Brazdil, Jr., Linda C. Glaeser, Mark A. Toft
  • Patent number: 4863888
    Abstract: The preparation, structure, and properties of solid inorganic materials containing cobalt, boron, oxygen and, optionally, aluminum, is described. Also described is the use of such materials in catalytic compositions for the conversion of organic compounds. In particular, the new material Co(BO.sub.2)OH is described as well as the use of such material in various catalyzed processes including oxidation of organic compound processes. A particularly useful process is a heterogeneous catalyzed partial oxidation of an alkylaromatic followed by complete oxidation to an aromatic polycarboxlic acid in a water phase.
    Type: Grant
    Filed: April 29, 1988
    Date of Patent: September 5, 1989
    Assignee: Amoco Corporation
    Inventors: Judith B. Melville, L. Charles Hardy, David A. Young
  • Patent number: 4861746
    Abstract: A catalyst for hydrotreating a heavy hydrocarbon oil which comprises a porous refractory inorganic oxide carrier component and at least one hydrogenating active metal component selected from nickel, cobalt and the like, the metal component concentration in the cross-section of the catalyst being the highest between the center of the cross-section and the periphery thereof.
    Type: Grant
    Filed: January 27, 1988
    Date of Patent: August 29, 1989
    Assignees: Nippon Oil Co., Ltd., Petroleum Energy Center Foundation
    Inventors: Yasuyuki Oishi, Akira Inoue
  • Patent number: 4853357
    Abstract: The additional of redox-active metal components and ligands, alternatively or simultaneously, results in increased conversion and selectivity in the palladium-catalyzed oxidation of olefins to carbonyl products in the presence of polyoxoanions. In preferred modes, heteropolyoxoanions and Isopolyoxoanions containing tungsten, molybdenum and vanadium, individually or in combination, are described. The use of copper as the redox-active metal component shows reduced allylic reactivity. The elimination of chloride from the catalyst system provides substantial engineering advantages over the prior art, particularly, the reduction of corrosion and chloro-organic by-product formation. The use of redox-active metal components and/or ligands makes the palladium-polyoxoanion catalyst system industrially practicable.
    Type: Grant
    Filed: September 30, 1987
    Date of Patent: August 1, 1989
    Assignee: Catalytica Associates
    Inventors: Janis Vasilevskis, Jacques C. De Deken, Robert J. Saxton, Paul R. Wentrcek, Jere D. Fellmann, Lyubov S. Kipnis
  • Patent number: 4845064
    Abstract: Catalysts for the preparation of alkyl halides produced by reacting (1) transition metal carbonyl complex capable of oxidatively adding H.sub.2 or HCl and (2) a Lewis acid from the group consisting of aluminum halides, antimony halides and mixtures thereof, with an adsorbent solid containing surface hydroxyl groups, in a solvent.
    Type: Grant
    Filed: January 6, 1987
    Date of Patent: July 4, 1989
    Assignee: University of Florida
    Inventors: Russell S. Drago, Cindy S. Goldstein
  • Patent number: 4829040
    Abstract: Mild hydrocracking is accomplished with a catalyst containing an intermediate pore molecular sieve, such as silicalite or a ZSM-5 type zeolite.
    Type: Grant
    Filed: June 19, 1987
    Date of Patent: May 9, 1989
    Assignee: Union Oil Company of California
    Inventor: John W. Ward
  • Patent number: 4824482
    Abstract: Diffusion aluminizing, when applied to titanium is effected with little or no activator to produce more uniform case and less etching.Workpieces are very rapidly pack-diffusion coated by using an excess of energizers in the pack, heating the retort containing the packed workpieces at a rate that brings the workpieces to diffusion-coating temperature and then completing the diffusion coating, all in less than 50 minutes, then cooling the retort.Diffusion aluminizing can also be applied to foils and powder to make pyrophoric product after leaching out much of the introduced aluminum. Powder can also be diffusion boronized. Pyrophoric boron-containing iron or nickel powder mixed with Ba(NO.sub.3).sub.2 will ignite to cause generation of large quantity of NO.sub.2 gas, and generation is improved when powdered boron and/or an oxidizer like NaClO.sub.3 is added.
    Type: Grant
    Filed: March 4, 1985
    Date of Patent: April 25, 1989
    Assignee: Alloy Surfaces Company, Inc.
    Inventor: Alfonso L. Baldi
  • Patent number: 4816538
    Abstract: A process for producing a high octane gasoline from a hydrocarbon feedstock in which the feedstock is contacted in the presence of hydrogen under hydrocracking conditions, preferably ammonia-rich hydrocracking conditions, with a hydrocracking catalyst comprising at least one hydrogenation metal component in combination with a cracking component. The preferred cracking components are Y zeolites and the catalyst preferably contains a nickel hydrogenation metal component, particularly in an amount greater than 13 weight percent, calculated as NiO. The catalyst may also contain a Group VIB metal component, such as a molybdenum component, particularly in a mole ratio greater than about 2 to 1, calculated as NiO to Group VIB metal trioxide. It has been found that such a process produces gasoline fractions having substantially increased research and motor octane numbers.
    Type: Grant
    Filed: August 4, 1987
    Date of Patent: March 28, 1989
    Assignee: Union Oil Company of California
    Inventor: Suheil F. Abdo
  • Patent number: 4798817
    Abstract: An SCR catalyst consisting essentially of iron sulfate or oxysulfur iron compound carried by a mixture of ceria and alumina on a support.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: January 17, 1989
    Assignee: Johnson Matthey, Inc.
    Inventors: E. Robert Becker, Hyun J. Jung
  • Patent number: 4788173
    Abstract: Ammoxidation of C.sub.3 to C.sub.5 acyclic alkanes with NH.sub.3 and O.sub.2 using (1) a mole ratio of alkane:NH.sub.3 in the range from 2 to 16 and a mole ratio of alkane:O.sub.2 in the range 1 to 10 and (2) a mixture of particulate catalyst compositions, the first being especially effective to promote formation of an unsaturated nitrile and an olefin from the paraffin, and the second catalyst composition being especially effective to promote the conversion of the olefin to the unsaturated nitrile. Catalytic compositions useful in the process are disclosed.
    Type: Grant
    Filed: July 21, 1986
    Date of Patent: November 29, 1988
    Assignee: The Standard Oil Company
    Inventors: Linda C. Glaeser, James F. Brazdil
  • Patent number: 4755497
    Abstract: The invention is a solid state preparation of copper aluminum borate catalyst comprising: dry mixing solid reagents comprising suitable precursors of copper oxide (CuO), aluminum oxide (Al.sub.2 O.sub.3) and boron oxide (B.sub.2 O.sub.3) with a solid binder which aids compaction of the solid reagents, is essentially inert to said reagents, and burns away upon calcination, said dry mixing resulting in formation of a superficially dry copper aluminum borate precursor; compacting the dry precursor; and calcining the precursor at a sufficiently high temperature to form crystalline copper aluminum borate.
    Type: Grant
    Filed: October 28, 1986
    Date of Patent: July 5, 1988
    Assignee: Amoco Corporation
    Inventors: Richard E. De Simone, Eric J. Moore, Bruce I. Rosen
  • Patent number: 4746641
    Abstract: Disclosed is a process for ammoxidation of paraffins containing 2-5 C atoms over a vanadium-antimony oxide catalyst, the catalyst, and a precursor slurry for making such catalyst.
    Type: Grant
    Filed: April 17, 1985
    Date of Patent: May 24, 1988
    Assignee: Standard Oil Company
    Inventors: Andrew T. Guttmann, Robert K. Grasselli, James F. Brazdil
  • Patent number: 4743574
    Abstract: A cobalt-molybdenum catalyst and a method for preparing same, said catalyst useful for the hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) of distillates of petroleum. The catalyst is supported by aluminum phosphate or an aluminum borate. In a preferred embodiment the catalyst has a low cobalt content, between 0.5% and 2.0% by weight calculated as CoO, and a molybdenum content of between 10% and 20% by weight, calculated as MoO.sub.3. The phosphorus or boron compounds added to the aluminum before the impregnation of the active metals prevents the formation of undesirable compounds of the CoAl.sub.2 O.sub.4 type, which is inactive in HDS. It is for that reason that the catalyst has a formulation with 70% less cobalt than the previous state-of-the-art catalysts. Very small crystals, highly dispersed on the surface of the catalyst, whose formula is CoMoO.sub.4, are responsible for the stability and the high level of activity in HDS and HDN which results.
    Type: Grant
    Filed: January 9, 1986
    Date of Patent: May 10, 1988
    Assignee: Intevep, S.A.
    Inventors: Alfredo L. Morales, Juan J. Garcia
  • Patent number: 4729979
    Abstract: Copper aluminum borate which is reducible under Temperature Programmed Reduction at a temperature no more than 350.degree. C. and/or has a surface area of at least 5 m.sup.2 /g and a pore volume of at least 0.04 cc per gram.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: March 8, 1988
    Assignee: Amoco Corporation
    Inventor: Alex Zletz
  • Patent number: 4725570
    Abstract: A method to increase hydrocarbon conversion activity of a catalyst comprising an AMS-1B crystalline borosilicate molecular sieve incorporated into a matrix comprises contacting said composition at least once with an aqueous solution containing an ammonium salt and then drying and calcining the resulting composition.
    Type: Grant
    Filed: November 19, 1985
    Date of Patent: February 16, 1988
    Assignee: Amoco Corporation
    Inventors: David L. Sikkenga, Muin S. Haddad
  • Patent number: 4724226
    Abstract: A boria promoted hydrotreating catalyst is made having a microporous region with high surface area for desulfurization and preferably a macroporous region to transport large metal containing molecules into the interior of the catalyst particle. The alumina support has 0.1 to 5% boria to form a hydrotreating catalyst which minimizes the formation of tetrahedrally coordinated boron. It is calcined to a temperature of 1400.degree. F. or less to maintain a high desulfurization activity. Conventional hydrotreating catalytic elements from Groups VB, VIB, VIIIB and VA of the Periodic Table are added. Less than 75% of the boron is in tetrahedral coordination as measured by Magic Angle Spinning .sup.11 B NMR.
    Type: Grant
    Filed: September 23, 1986
    Date of Patent: February 9, 1988
    Assignee: W. R. Grace & Co.
    Inventors: Wu-Cheng Cheng, Carmo J. Pereira
  • Patent number: 4720474
    Abstract: The addition of redox-active metal components and ligands, alternatively or simultaneously, results in increased conversion and selectivity in the palladium-catalyzed oxidation of olefins to carbonyl products in the presence of polyoxoanions. In preferred modes, heteropolyoxoanions and isopolyoxoanions containing tungsten, molybdenum and vanadium, individually or in combination, are described. The use of copper as the redox-active metal component shows reduced allylic reactivity. The elimination of chloride from the catalyst system provides substantial engineering advantages over the prior art, particularly, the reduction of corrosion and chloro-organic by-product formation. The use of redox-active metal components and/or ligands makes the palladium-polyoxoanion catalyst system industrially practicable.
    Type: Grant
    Filed: September 24, 1985
    Date of Patent: January 19, 1988
    Assignee: Catalytica Associates
    Inventors: Janis Vasilevskis, Jacques C. De Deken, Robert J. Saxton, Paul R. Wentrcek, Jere D. Fellmann, Lyubov S. Kipnis
  • Patent number: 4717701
    Abstract: Density and flexural modulus of olefin polymers can be controlled using a chromium catalyst on a iron and aluminum phosphate and/or polyphosphate gel base.
    Type: Grant
    Filed: August 13, 1986
    Date of Patent: January 5, 1988
    Assignee: Phillips Petroleum Company
    Inventor: Max P. McDaniel
  • Patent number: 4696911
    Abstract: Nickel boride hydrogenation catalysts stabilized with polyvinylpyrrolidone, having constant excellent quality, are prepared by incorporating glycerol monooleate before the alcohol is evaporated off.
    Type: Grant
    Filed: October 16, 1986
    Date of Patent: September 29, 1987
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Hiepke Boerma, Rudolph O. de Jongh, Cornelis Van Dijk
  • Patent number: 4672049
    Abstract: This invention provides a novel hydrocracking catalyst composition that contains Zeolite Beta having a framework boron content, a solid source of alumina, and a hydrogenation component. It further provides a low-pressure hydrocracking process that uses such composition.
    Type: Grant
    Filed: March 5, 1986
    Date of Patent: June 9, 1987
    Assignee: Mobil Oil Corporation
    Inventors: Nai Yuen Chen, Tracy J. Huang
  • Patent number: 4659687
    Abstract: Novel alumina-supported nickel boride catalysts prepared by the borohydride promoted reduction of nickel arsenate are described. Method of catalyst preparation and process for hydrogenation of acetylenic and diolefinic compounds employing the invention catalysts are also described.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: April 21, 1987
    Assignee: Phillips Petroleum Company
    Inventor: Ted H. Cymbaluk
  • Patent number: 4645753
    Abstract: Composition comprising a crystalline aluminum borate and from about 0.05 to 50 wt % at least one compound selected from the group consisting of an alkali metal and alkaline earth metal compound based on the weight of the aluminum borate.
    Type: Grant
    Filed: March 13, 1985
    Date of Patent: February 24, 1987
    Assignee: Standard Oil Company
    Inventors: Alex Zletz, Larry C. Satek, Jeffrey T. Miller
  • Patent number: 4636487
    Abstract: A highly active promoted catalyst, for use in hydrotreating oils, comprising a support, selected from the group consisting of alumina, silica and silica-alumina, and a promoter comprising a hydroxymercaptide of one or more metals, wherein said metals are selected from Group IB, Group VIB, Group VIIB or Group VIII of the Periodic Table, is economically produced without the use of a high temperature calcination or high temperature presulfiding step. In accordance with the invention, the hydroxymercaptide promoter used in said promoted catalyst may be the reaction product of a mercaptoalcohol and one or more metal compounds, wherein said metal compounds comprise metals selected from Group IB, Group VIB, Group VIIB or Group VIII of the Periodic Table.
    Type: Grant
    Filed: September 16, 1985
    Date of Patent: January 13, 1987
    Assignee: Phillips Petroleum Company
    Inventors: Stephen L. Parrott, Simon G. Kukes, Howard F. Efner
  • Patent number: 4600701
    Abstract: The invention provides a novel, active hydrogenation catalyst comprising nickelboride stabilized with a vinylpyrrolidone group containing polymer, said catalyst satisfies a certain activity test in the hydrogenation of soybean oil. The invention further provides a method for the preparation of said catalyst involving the use of a nickel salt containing less than 6, preferably less than 5 molecules of crystal water.
    Type: Grant
    Filed: April 12, 1985
    Date of Patent: July 15, 1986
    Assignee: Internationale Octroi Maatschappij "Octropa" B.V.
    Inventors: Rudolph O. de Jongh, Cornelis van Dijk
  • Patent number: 4551441
    Abstract: A finely divided nickel boride hydrogenation catalyst which is stabilized with an organic linear polymer dispersed in a fatty substance like a triglyceride oil or a fatty amide is provided. The catalyst is stable upon storage and has a good selectivity. This catalyst yields excellent results in hydrogenation processes.
    Type: Grant
    Filed: July 11, 1984
    Date of Patent: November 5, 1985
    Assignee: Internationale Octrooi Maatscappij "Octropa" B.V.
    Inventors: Cornelis Van Dijk, Rudolph O. De Jongh
  • Patent number: 4537867
    Abstract: Iron-cobalt spinels which contain low levels of cobalt, in an iron/cobalt atomic ratio of 7:1 to 35:1, are converted to Fischer-Tropsch catalysts upon reduction and carbiding that exhibit high activity and selectivity to C.sub.2 --C.sub.6 olefins and low CH.sub.4 production.
    Type: Grant
    Filed: December 14, 1983
    Date of Patent: August 27, 1985
    Assignee: Exxon Research and Engineering Co.
    Inventors: Rocco A. Fiato, Stuart L. Soled, Angelo A. Montagna
  • Patent number: 4497909
    Abstract: Novel catalyst compositions are provided comprising a silica/alumina carrier having a silica content less than about 40% by weight and at least one noble metal component of Group VIII of the Periodic Table and wherein the catalyst contains (1) pores having a diameter of smaller than 600 .ANG. occupying at least 90% of the total pore volume and (2) pores having a diameter of 150 to 600 .ANG. occupying at least about 40% of the total volume of the pores having a diameter of smaller than 600 .ANG.. This catalyst is particularly useful in the production of jet fuels and white oils.
    Type: Grant
    Filed: August 6, 1981
    Date of Patent: February 5, 1985
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Takuji Itoh, Ikuo Akitsuki
  • Patent number: 4473707
    Abstract: A process is provided for the preparation of coated iron phosphorus oxide containing catalysts useful in the oxydehydrogenation of saturated carboxylic acids, wherein the catalysts are prepared by partially wetting a carrier or support in an aqueous silica solution/suspension, contacting the partially wet carrier with a powder of the iron phosphorus oxide catalyst, drying and calcining.
    Type: Grant
    Filed: June 28, 1982
    Date of Patent: September 25, 1984
    Assignee: The Standard Oil Company
    Inventors: Harry H. I. Teng, S. Erik Pedersen
  • Patent number: 4464480
    Abstract: Improved catalyst systems which may be used for a wide variety of chemical reactions such as gas conversion reactions may be prepared by impregnating a transition metal compound which may contain a structural promoter with a nonaqueous solution of an alkali metal superhydride in order to provide a more uniform distribution of the chemical promoter on the active surface of the catalyst. As an example, iron oxide which has been structurally promoted with aluminum may be impregnated with a nonaqueous solution of potassium triethyl-borohydride to prepare an active gas conversion catalyst.
    Type: Grant
    Filed: May 27, 1983
    Date of Patent: August 7, 1984
    Assignee: UOP Inc.
    Inventors: Hassan Windawi, Randy J. Lawson
  • Patent number: 4440870
    Abstract: Novel borate catalyst systems useful for the esterification of olefins are described. The catalyst system is made up of two or more transition metal borates which are co-precipitated. Typical are the zirconyl-cobalt borate, zirconyl-nickel borate and vanadyl-cobalt borate systems.
    Type: Grant
    Filed: July 28, 1982
    Date of Patent: April 3, 1984
    Assignee: Texaco Inc.
    Inventors: John R. Sanderson, Lewis W. Watts, Jr., Walter H. Brader, Jr.
  • Patent number: 4439542
    Abstract: Novel heterogeneous boride catalysts comprising a polyborane anion and a Group VIII metal for the treatment of carbonaceous materials. The catalyst is prepared by the steps of contacting a polyborane anion with a salt of a Group VIII metal in the presence of a solvent to form a catalyst precursor, removing the solvent and, heating the precursor under hydrogen at a pressure of at least about 3.45 MPa at a temperature of from about 200.degree. C. to about 600.degree. C. Treatment of carbonaceous materials includes the steps of contacting the carbonaceous material with the heterogeneous boride catalyst and with hydrogen in the presence of a solvent in a reactor, pressurizing the reactor with hydrogen to at least about 3.45 MPa and, heating the reactor to a temperature of about 200.degree. C. to about 600.degree. C. The heterogeneous boride catalyst can also be prepared in situ.
    Type: Grant
    Filed: August 17, 1982
    Date of Patent: March 27, 1984
    Assignee: The Standard Oil Company
    Inventor: Alan Bonny
  • Patent number: 4424141
    Abstract: Bismuth molybdate catalysts formed from a precatalyst slurry which uses an organic liquid or mixture of an organic liquid and water as the liquid medium of the slurry exhibit superior catalytic properties.
    Type: Grant
    Filed: January 5, 1981
    Date of Patent: January 3, 1984
    Assignee: The Standard Oil Co.
    Inventors: Robert K. Grasselli, Dev D. Suresh, Maria S. Friedrich
  • Patent number: 4424142
    Abstract: A catalyst for the hydrotreatment of heavy hydrocarbon oils, which is prepared by supporting more than 2% by weight of VS.sub.x, wherein x represents about 1.1-1.59 in terms of an atomic ratio of S/V, on a substrate composed of a clay mineral which consists of magnesium silicate as a major component and having a double-chain structure and a process for preparing the catalyst are provided. The catalyst is prepared by accumulating the VS.sub.x on the substrate using a heavy hydrocarbon oil which contains particularly large amounts of vanadium and sulfur.
    Type: Grant
    Filed: March 12, 1981
    Date of Patent: January 3, 1984
    Assignee: Chiyoda Chemical Engineering & Construction Co., Ltd.
    Inventors: Sachio Asaoka, Yoshimi Shiroto, Munekazu Nakamura, Takeo Ono
  • Patent number: 4422960
    Abstract: A catalyst for hydrotreating a heavy hydrocarbon oil containing asphaltenes comprises a porous carrier composed of one or more inorganic oxides of at least one element selected from among those of Groups II, III and IV of the Periodic Table, and at least one catalytic metal component composited with the carrier. The metal of the catalytic metal component is selected from among those of Groups VB, VIB, VIII and IB of the Periodic Table. The catalyst contains about 1 to 30% by weight of such catalytic metal component and has the following pore characteristics with regard to its pores having a diameter of 75 .ANG. or more: an average pore diameter APD of about 180 to 500 .ANG., a total pore volume PV, expressed in cc/g, being equal to or greater than a value X ##EQU1## the volume of pores with a diameter of about 180 to 500 .ANG. being at least about 0.2 cc/g, the volume of pores with a diameter of at least 1,500 .ANG. being not greater than about 0.03 cc/g, and a total surface area being at least about 60 m.
    Type: Grant
    Filed: December 14, 1980
    Date of Patent: December 27, 1983
    Assignee: Chiyoda Chemical Engineering & Construction Co., Ltd.
    Inventors: Yoshimi Shiroto, Takeo Ono, Sachio Asaoka, Munekazu Nakamura