Abstract: Molecular sieve compositions have been synthesized which are resistant to the loss of framework atoms. Specifically, the molecular sieves of the invention have the empirical formulamA: (M.sub.w Al.sub.x Si.sub.y)O.sub.2where A is at least one rare earth metal, M is chromium or titanium and "m", "w", "x" and "y" are the mole fractions of A, M, Al and Si respectively. Applicants have discovered that the rare earth metals prevent loss of chromium and titanium from the framework and degradation of the molecular sieve. Along with the composition, a process for preparing the composition and processes using the composition are disclosed and claimed.

Abstract: Forms of zeolite Omega synthesized by hydrothermal crystallization from reaction systems containing alkali metal cations and organic templating agents, modified by calcination in air, ion-exchange, steam calcination and treatment with a low-pH aqueous ammonium ion solution, are significantly improved with respect to surface area, catalytic activity and adsorption capacities for large molecular species. A catalyst comprising zeolite Omega is effective for isomerization of aromatics and aliphatics.

Abstract: Forms of zeolite Omega synthesized by hydrothermal crystallization from reaction systems containing alkali metal cations and organic templating agents, modified by calcination in air, ion-exchange, steam calcination and treatment with a low-pH aqueous ammonium ion solution, are significantly improved with respect to surface area, catalytic activity and adsorption capacities for large molecular species.The zeolite compositions of the invention may be used in a variety of hydrocarbon conversion reactions.

Abstract: Hydrocarbon conversion reactions are carried out over a catalyst composition containing forms of zeolite Omega synthesized by hydrothermal crystallization from reaction systems containing alkali metal cations and organic templating agents which have been modified by calcination in air, ion-exchange, steam calcination and treatment with a low-pH aqueous ammonium ion solution.

Abstract: Novel catalyst compositions comprising a metal hydrogenation component and a modified form of zeolite Y are found to be highly effective in the hydrocarbon conversion processes carried out in the presence of added hydrogen and involving hydrogenation as an essential reaction mechanism. The modified form of zeolite Y is prepared from a starting zeolite Y which has been ammonium cation exchanged to lower the alkali metal content to less than 3.0 weight percent. The starting composition is then steamed at temperatures above about 550.degree. C. to reduce the unit cell dimension and then contacted with an aqueous ammonium ion solution having a pH below about 4 to increase the bulk Si/Al.sub.2 ratio to the range of about 6.5 to 20.

Abstract: The combination of a steam-stabilized form of zeolite Y, known in the art as Y-85, and a form of zeolite beta which has been modified to maximize the weak acid sites and minimize the strong acid sites, is found to be a uniquely effective acidic component of a hydrocracking catalyst for the production of gasoline. Both the catalyst composition and the hydrocracking process utilizing the catalyst are disclosed.

Abstract: Zeolite LZ-202 and other zeolites synthesized in the absence of organic templating agents and having a crystal structure isotypic with the mineral mazzite are subjected to a three-step treatment to greatly increase their surface area, catalytic activity and adsorptive capacity for adsorbates having molecular dimensions as large as the SF.sub.6 molecule. The treatment steps involve an initial conventional NH.sub.4.sup.+ ion-exchange, steaming at temperatures in excess of 300.degree. C. and a low-pH NH.sub.4.sup.+ ion-exchange at pH values below 4.0.

Abstract: The combination of a steam-stabilized form of zeolite Y, known in the art as Y-85, and a form of zeolite beta which has been modified to maximize the weak acid sites and minimize the strong acid sites, is found to be a uniquely effective acidic component of a hydrocracking catalyst for the production of gasoline. Both the catalyst composition and the hydrocracking process utilizing the catalyst are disclosed.

Abstract: Forms of zeolite Omega synthesized by hydrothermal crystallization from reaction systems containing alkali metal cations and organic templating agents, modified by calcination in air, ion-exchange, steam calcination and treatment with a low-pH aqueous ammonium ion solution, are significantly improved with respect to surface area, catalytic activity and adsorption capacities for large molecular species.

Abstract: Process for hydrocracking a crude oil feed, hydrocracking catalyst employed therein and the process for its preparation.

Abstract: Novel catalyst bases are described which are prepared by hydrothermally treating an ammonium ion exchanged sodium Y zeolite followed by low pH ammonium ion exchange to produce highly crystalline zeolite catalyst base. Catalysts incorporating such novel zeolite catalyst bases, as well as hydrocracking and fluid catalytic cracking processes for the production of gasoline products utilizing catalysts incorporating such novel catalyst bases, are also described.

Abstract: A process for hydrocracking a crude oil feed, a hydrocracking catalyst employed therein, and a process for the preparation of this catalyst are disclosed. The hydrocracking catalyst comprises a zeolitic aluminosilicate which has an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of at least 6 and which has been treated by (i) thermal treatment at an effective temperature and for an effective time in the presence of steam, followed by (ii) ion-exchange with a solution containing ammonium ion; and (2) an effective amount of a hydrogenation component. In a preferred embodiment, the starting crystalline zeolitic aluminosilicate is a Y-type zeolite having an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of at least about 9 and a unit cell dimension (a.sub.o) of less than about 24.55 .ANG., and the steam treatment is carried out for a period sufficient to cause a decrease of not more than about 0.1 .ANG. in the unit cell dimension, thereby producing a Y-type zeolite product having a SiO.sub.2 /Al.sub.2 O.sub.

Abstract: This invention relates to a method for catalytically reducing one or more nitrogen oxides from a gaseous stream containing one or more nitrogen oxides and optionally one or more sulfur oxides which comprises contacting said gaseous stream and ammonia with a microporous molecular sieve composition at effective reduction conditions in which the amount of ammonia in said method is excessive over the stoichiometric amount necessary for catalytically reducing one or more nitrogen oxides from said gaseous stream, wherein said microporous molecular sieve composition is (i) optionally acid treated with an inorganic or organic acid, (ii) hydrogen-forming cation exchanged and (iii) optionally metal cation exchanged, prior to said contacting in said method, and wherein at least a portion of excessive ammonia in said method is oxidized without substantial adverse effect on catalytically reducing one or more nitrogen oxides from said gaseous stream.

Abstract: Catalytic cracking catalysts, the process of their preparation and the process of their use. The cracking catalyst comprises a zeolite having a mole ratio of oxides in the dehydrated state of (0.85-1.1) M.sub.2/n O:Al.sub.2 O.sub.3 :xSiO.sub.2 wherein "M" is a cation having a valence of "n", "x" has a value greater than 6.0, has a x-ray powder diffraction pattern having at least the d-spacings of Table A, has extraneous silicon atoms in the crystal lattice in the form of framework SiO.sub.4 tetrahedra and has been thermally treated and/or cation exchanged with a multivalent cation. The catalyst of the instant invention are unique in the fact that the zeolitic aluminosilicate has less than 1.2 weight percent Na.sub.2 O and such is achieved without the requirement of a pre-calcination step.

Abstract: Process for hydrocracking a crude oil feed, hydrocracking catalyst employed therein and the process for its preparation. The instant invention employs new aluminosilicate zeolite catalysts derived from a new zeolites denominated "LZ-210" which provide hydrocracking catalysts which demonstrate improved activity in first and/or second stage operation.

Abstract: Catalytic cracking catalysts, the process of their preparation and the process of their use. The cracking catalyst comprises a zeolite having a mole ratio of oxides in the dehydrated state of (0.85-1.1) M.sub.2/n O:Al.sub.2 O.sub.3 :xSiO.sub.2 wherein "M" is a cation having a valence of "n", "x" has a value greater than 6.0, has a x-ray powder diffraction pattern having at least the d-spacings of Table A, has extraneous silicon atoms in the crystal lattice in the form of framework SiO.sub.4 tetrahedra and has been thermally treated and/or cation exchanged with a multivalent cation. The catalyst of the instant invention are unique in the fact that the zeolitic aluminosilicate has less than 1.2 weight percent Na.sub.2 O and such is achieved without the requirement of a pre-calcination step.

Abstract: A spent catalyst comprising a zeolite base and an active metal such as a Group VIII noble metal is rejuvenated by contacting the catalyst with an aqueous solution containing urea.

Abstract: Molecular sieve catalyst compositions having decreased catalytic activity as a result of accumulating more than 2 weight-% carbonaceous coke deposits are restored essentially to their pre-coked activity by heating an essentially homogeneous mixture of particles thereof with particles of an inert refractory material in the weight ratio of from 1:2 to 1:10 in air at a temperature of from 500.degree. C. to 725.degree. C. for a period of time sufficient to decrease the carbonaceous coke to less than two weight percent.