Abstract:
Alumina-composited zeolite catalysts are activated by contact with an aqueous ammonium solution under ammonia gas pressure such that a pH of at least about 8 is maintained in the solution. The treated zeolite may thereafter be calcined without prior ammonium-exchange to provide the zeolite in the hydrogen form.
Abstract:
The acidity of a zeolite catalyst is reduced by calcination in an essentially water-free atmosphere at temperatures above 700.degree. C., preferably from 725.degree. to 800.degree. C., to reduce the alpha value to less than about 10 percent of its original value. The low acidity catalysts produced in this way may be used for conversions requiring low acidity, shape selective catalysis, including dewaxing. The calcined, low acidity catalysts exhibit improved dewaxing activity.
Abstract:
A process for the production of lubricant oil range hydrocarbon having increased viscosity index by oligomerization of lower olefins over medium pore shape selective acid zeolite catalyst. The preferred oligomerization process is conducted using 50 ppm to 5 weight percent of water vapor as cofeed, based on olefin and acid ZSM-5 zeolite.
Abstract:
The ion-exchange capacity and acid catalytic activity of a ZSM-5 type zeolite are increased by treatment of a physical mixture of the zeolite and an inorganic oxide with water in the presence of an alkali metal cation.Specifically, the catalyst is prepared by contacting a mixture of a crystalline zeolite having a silica to alumina ratio above 12 and a Constraint Index between about 1 and about 12, and a solid source of aluminum with liquid water in the presence of an activating amount of an alkali metal cation and under a combination of conditions including a temperature up to about 370.degree. C. for less than about an hour to about 100 hours to induce increased activity to the zeolite.
Abstract:
There is provided a process for activating a zeolite with an aluminum phosphate material. The process comprises hydrothermally treating an intimate mixture of the zeolite and an effective amount of aluminum phosphate activating agent in contact with an aqueous liquid phase under reaction conditions to increase the cracking activity of the mixture. Examples of zeolites which may be activated include low acidity zeolites such as boron-containing ZSM-5, boron-containing zeolite Beta and high silica ZSM-5. The aluminum phosphate may be in the form of a microporous, crystalline framework material such as AlPO.sub.4 -5.
Abstract:
The ion-exchange capacity and acid catalytic activity of a ZSM-5 type zeolite are increased by treatment of a physical mixture of the zeolite and a solid source of aluminum with water in the presence of an alkali metal compound activating agent and an alkali metal salt of a mineral acid.
Abstract:
A process is provided for converting feedstock comprising oxygenates to product comprising hydrocarbons over a catalyst comprising a high silica crystalline zeolite which has been treated sequentially by contact with a dilute hydrogen fluoride solution and then by contact with aluminum chloride vapor.
Abstract:
Disclosed is a method and apparatus for producing distillate and/or lubes which employ integrating catalytic (or thermal) dehydrogenation of paraffins with MOGDL. The process feeds the product from a low temperature propane and/or butane dehydrogenation zone into a first catalytic reactor zone, which operates at low pressure and contains zeolite oligomerization catalysts, where the low molecular weight olefins are reacted to primarily gasoline range materials. These gasoline range materials can then be pressurized to the pressure required for reacting to distillate in a second catalytic reactor zone operating at high pressure and containing a zeolite oligomerization catalyst. The distillate is subsequently sent to a hydrotreating unit and product separation zone to form lubes and other finished products.
Abstract:
A process is provided for conducting organic compound conversion over a catalyst comprising a crystalline zeolite which has been treated by impregnation with an ammoniacal aluminum fluoride solution, contact with an ammonium salt solution, and calcination.
Abstract:
A process for the conversion of alcohols and/or ethers to diesel fuel hydrocarbon mixtures comprising contacting alcohols and/or ethers with large pore zeolites, such as rare-earth Y aluminosilicate under elevated pressures and temperatures below about 600.degree. F.