Abstract: The present invention relates to a process for the oligomerization of light olefins or mixtures thereof, wherein a reaction is brought about between olefins with a carbon number of between 2 and 20 and synthetic zeolites containing silicon, titanium and gallium oxides which in the calcined, anyhdrous state have the following empirical formula:pHGaO.sub.2 .multidot.qZTiO.sub.2 .multidot.SiO.sub.2,where p is of a value greater than zero and less than or equal to 0.050 and q is of value greater than zero and less than or equal to 0.025, with the H.sup.+ of HGaO.sub.2 being at least partly exchangeable or exchanged with cations.

Abstract: A process is disclosed for oligomerizing light olefins or their mixtures, which consists in reacting said olefins, possibly diluted with an inert gas, by means of synthetic zeolites containing oxides of silicon, titanium and aluminum, which have, in their calcined and anhydrous state, the following empirical formula:pHAlO.sub.2 .multidot.qTiO.sub.2 .multidot.SiO.sub.2'wherein p has a vlue larger than zero and smaller than, or equal to, 0.050 and g has a value larger than zero and smaller than, or equal to, 0.025, and the H.sup.+ of HAlO.sub.2 can be at least partially substitutable or substituted with cations.

Abstract: A process is disclosed for oligomerizing light olefins or mixtures thereof, which consists in reacting said olefins, possibly diluted with an inert gas, by means of synthetic zeolites containing oxides of silicon, titanium and iron, having, in their calcined and anhydrous state, the following empirical formula:pHFeO.sub.2. qTiO.sub.2.SiO.sub.2,wherein p has a value larger than zero and smaller than, or equal to, 0.050 and g has a value larger than zero and smaller than, or equal to 0.025, and the H.sup.+ of HFeO.sub.2 can be at least partially substitutable or substituted with cations.

Abstract: A catalytic system and process for producing mixtures of methanol and higher alcohols from synthesis gas, the catalytic system comprising zinc, chromium, copper, one or more alkaline metals, and possibly one or more metals chosen from molybdenum, manganese, lanthanium, cerium, aluminium, titanium and vanadium, either all or only part of said elements being chemically bonded to oxygen and/or together.

Abstract: The invention provides a silica-based crystalline material that incorporates titanium into the crystal lattice. A process for preparing this material is also disclosed which is based on the reaction of silica, tetra-alkyl orthotitante and tetrapropyl-ammonium hydroxide.

Abstract: The invention is concerned with particular crystalline silica materials that contain boron in the crystal lattice. These materials are useful as catalysts for many reactions.

Abstract: A catalytic system and process for producing mixtures of methanol and higher alcohols from synthesis gas, the catalytic system comprising zinc, chromium, copper, one or more alkaline metals, and possibly one or more metals chosen from molybdenum, manganese, lanthanum, cerium, aluminum, titanium and vanadium, either all or only part of said elements being chemically bonded to oxygen and/or together.

Abstract: In the process for dehydrating an aliphatic alcohol to convert same into the corresponding ether, the improvement consisting in that the catalyst is an active alumina on the surface of which a layer of a silicon compound has been deposited. Long life of the catalyst and improved conversion rates are the main advantages.

Abstract: In the reaction of conversion of nitriles to amides, more particularly, but not exclusively, acrylonitrile to acrylamide, the improvement consisting in the adoption, as a catalyst, of a copper-based catalyst which is prepared by reacting an organic copper chelate with aluminum-alkyl and/or an aluminum hydride. Higher yields and higher selectivity are obtained over the usual copper-based catalysts.

Abstract: A process is disclosed for preparing tertiary olefins having a high degree of purity and in good yields starting from tertiary ethers such as methyltert.butyl ether and in which the improvement comprises using an extremely efficient catalyst system which consists of a crystalline silica having a high specific surface area and which has been modified by an oxide of a metallic cation having an at least partially amphoteric character. Such catalyst may be, if appropriate, accompanied by an alumina-modified silica as an adjuvant co-catalyst.

Abstract: A method for the production of dimethyl ether by catalytical reaction between carbon monoxide and hydrogen is disclosed, in which an improved catalyst system is used. The improved catalyst is composed of a mixture of oxides and/or salts of metals such as Al, Cr, La, Mn, Cu, Zn and their mixtures which have been subjected to a stabilization process with a compound of silicon having substituents of various natures; such as hydrocarbonaceous radicals, and halogens. This catalyst is a considerable advance over the prior art.

Abstract: A process for preparing acrylonitrile comprising feeding propylene, ammonia and oxygen at ratios between 1/0.7/1 and 1/1.4/3 and at temperatures between 350.degree. C. and 550.degree. C., at pressures between 1 atm. and 5 atm. over a catalyst consisting essentially of one having the general formula:W.sub.a M.sub.b Me.sub.c viii O.sub.dwherein W is tungsten; M is bismuth; Me viii is iron; and O is oxygen, and wherein the tungsten is present in gram atomic amounts greater than the gram atomic amounts of each individual remaining metal component or the sum of the remaining components and a is 1; b is 0.04 to 0.8; c is 0.08 to 0.8; and d is 2.5 to 9.5, said catalyst having been calcined at a temperature in the range of from 400.degree. C. to 800.degree. C. for from 1 to 60 hours.

Abstract: A new catalyst is described which is useful in the ammoxidation or oxidation of olefins. It consists of a mixture of oxidation compounds of uranium, tellurium and molybdenum, which may be accompanied by an activator consisting of an oxidation compound of an element selected from groups Ib, IIa, IIb, IIIa, IIIb, IVa, Va, VIb, VIIb and VIII of the periodic system, and is represented by the formula: U.sub.a Te.sub.b Mo.sub.c Me.sub.d X wherein, U is uranium, Te is tellurium, Mo is molybdenum, Me is the activator element, X is the oxygen necessary for saturating the other valences, a is 1, b is 1 to 8, c is 0.1 to 1 and d is 0 to 5. In the use of that catalyst, unsaturated nitriles are prepared by contacting a mixture, in vapor phase, of an olefin, ammonia and oxygen or a gas containing oxygen in the presence of the catalyst; and olefins are converted to oxygen containing compounds or dienes by contacting, in vapor phase, a mixture of the olefin and oxygen in the presence of the catalyst.

Abstract: The invention relates to the skeleton isomerization of alkenes and, more particularly, to the catalyst for the isomerization reaction, the catalyst being prepared by treating an oxide of a metal of the group comprising aluminium, titanium, magnesium, silicon, chrome, zirconium, iron and their mixtures, preferably an active alumina, with a silicon compound, preferably an alkyl ester of the orthosilicic acid, and then subjecting the thus treated oxide to drying and to a controlled oxidation. Thus catalyst is obtained which permits higher yields and selectivity of the isomerization reaction to be achieved, as well as a longer operative life of the catalyst before the regeneration thereof.

Abstract: The mechanical and thermal properties of aluminum oxide, such as .gamma. alumina, adapted for use as a catalyst or catalyst carrier are improved through a treatment thereof with a silicon compound containing hydrolyzable radicals, such as methyl orthosilicate, in which the aluminum compound is impregnated with the silicon compound or a solution thereof in a compatible organic solvent whose boiling point is lower than the boiling point of the silicon compound. The impregnated aluminum oxide is slowly brought to the boiling temperature of the silicon compound in an inert atmosphere so as to cause silicon compound to react with the aluminum oxide and to distill off reaction products and excess silicon compound. The hydrolyzable groups bound to the silicon compound on the aluminum oxide are then reacted with water and distilled off.

Abstract: The mechanical and thermal properties of aluminum oxide, such as .gamma. alumina, adapted for use as a catalyst or catalyst carrier are improved through a treatment thereof with a silicon compound such as an alkyl orthosilicate in which the aluminum oxide is impregnated with the silicon compound or a solution thereof in a compatible organic solvent whose boiling point is lower than the boiling point of the silicon compound. The impregnated aluminum oxide is dried at a temperature in the range from above the boiling point of the silicon compound to 500.degree. C and is then subjected to controlled oxidation.

Abstract: A method is disclosed for preparing tertiary olefins starting from the corresponding tertiary ethers, the improvement consisting in contacting the ether with a catalyst composed by active alumina modified by reaction with a silicon compound selected among those corresponding to the general formula: ##STR1## wherein X,Y,Z and W can be --R, --OR, --Cl, --Br, --SiH.sub.3 , --COOR, --Sih.sub.n O.sub.m, R being hydrogen, an alkyl, cycloalkyl, aryl, aralkyl or alkyl-cycloalkyl radical of from 1 to 30 carbon atoms, n and m being integers comprised between 1 and 3. The advantages afforded by the invention are mainly the nearly quantitative yields and the high purity of the end products.

Abstract: A catalyst useful in the ammoxidation or oxidation of olefins consisting of a mixture of uranium oxide and tellurium oxide wherein the Te/U atomic ratio is in the range from 2 to 5. Also disclosed is a catalyst as defined above which is supported on a carrier.

Abstract: The mechanical and thermal properties of aluminum oxide, such as .gamma. alumina, adapted for use as a catalyst or catalyst carrier are improved through a treatment thereof with a silicon compound such as an alkyl orthosilicate in which the aluminum oxide is impregnated with the silicon compound or a solution thereof in a compatible organic solvent whose boiling point is lower than the boiling point of the silicon compound. The impregnated aluminum oxide is dried at a temperature in the range from above the boiling point of the silicon compound to 500.degree. C. and is then subjected to controlled oxidation.