摘要:
Alkyl aromatic compounds are prepared by alkylating an alkylatable aromatic compound with a paraffin alkylating agent under alkylation reaction conditions in the presence of catalyst comprising synthetic porous crystalline material characterized by an X-ray diffraction pattern including interplanar d-spacings at 12.36.+-.0.4, 11.03.+-.0.2, 8.83.+-.0.14, 6.18.+-.0.12, 6.00.+-.0.10, 4.06.+-.0.07, 3.91.+-.0.07, and 3.42.+-.0.06 Angstroms.
摘要:
A process for shape selective hydrocarbon conversion involves contacting a hydrocarbon feedstream under conversion conditions with a catalytic molecular sieve which has been modified by treatment with an amino silane polymer while molecular sieve acid sites are protected. When the process is toluene disproportionation, a toluene feedstream may also contain a second silicon source which is a high pxylene selectivating agent. The invention also includes the modification method and the shape selective catalyst which results from the modification.
摘要:
There is provided a catalyst comprising a heteropoly acid, such as phosphotungstic acid, supported on a mesoporous crystalline material, such as M41S. A particular form of this M41S support is designated as MCM-41. There is also provided a method for preparing this catalyst by impregnating the heteropoly acid on the support. There is also provided a process for using this catalyst to catalyze acid catalyzed reactions, such as the isomerization of paraffins and the alkylation of aromatics.
摘要:
There is provided a catalyst comprising MCM-36 and a hydrogenation/dehydrogenation component. A particular example of such a catalyst comprises MCM-36, nickel and tungsten.
摘要:
A process for producing high quality lubricants by the hydrocracking and hydroisomerization of petroleum waxes uses a catalyst which is based on an ultra-large pore crystalline material. The crystalline material exhibits unusually large pores of at least 13 .ANG. diameter and a high sorption capacity demonstrated by its benzene adsorption capacity of greater than about 15 grams benzene/100 grams at 50 torr and 25.degree. C. The crystalline material is characterized by an X-ray diffraction pattern with at least one d-spacing greater than about 18 .ANG. and in a particularly preferred form, a hexagonal arrangement of pores of at least 13 .ANG. diameter which can be indexed with a d.sub.100 value greater than about 18 .ANG.. The hydrocracking catalysts based on these materials are capable of producing lube products with a high VI of at least 120 and usually higher, values of 135 and higher e.g. 143. the lube products are produced in good yield from feeds which may contain down to about 30 percent wax content, although wax contents of at least 50 percent are preferred for the highest quality products. The catalysts achieve this result without the use of fluorine or other promoters.
摘要:
A method is provided for reducing NO.sub.x for high flow applications such as NO.sub.x abatement in an exhaust gas from an internal combustion engine operating under lean burn conditions wherein NO.sub.x is reduced by hydrocarbon reductants. The method employs a hydrothermally stable catalyst comprising transition metal-containing ZSM-5 which is prepared by in-situ crystallization of an aggregate comprising ZSM-5 seeds, silica, and a crystalline silicate.
摘要:
This invention relates to catalytic conversion of feedstock organic compounds to conversion product by contacting the feedstock at conversion conditions with catalyst comprising a new form of crystalline porous chalcogenide, e.g., silicate or like material, synthesized by a particular method.
摘要:
Low acidity refractory oxide-bound molecular sieve, e.g., zeolite, compositions, for example, zirconia-bound zeolite Beta, possessing superior physical properties, e.g., crush strength, and the method for their manufacture are described. Since low acidity refractory oxide-bound catalysts are less active than alumina-bound zeolite catalysts, the former are particularly useful in hydrocarbon conversion processes in which reduced coke make increases catalyst cycle length. Due to their stability in acid environments, the low acidity refractory oxide-bound molecular sieve extrudate herein can be acid treated without unduly compromising its structural integrity.
摘要:
A catalyst comprising a molecular sieve having a lattice aluminum content in which the silica/alumina framework mole ratio is less than 55, and having a diffusion rate constant of less than about 150 sec.sup.-1 .times.10.sup.-6 is particularly useful for vapor-phase disproportionation of toluene.
摘要:
There is provided a method for preparing a zeolite other than ZSM-5 from a reaction mixture comprising a mixed organic directing agent which is a combination of (a) an organic nitrogen containing compound such as an amine or a quaternary ammonium compound and (b) an alcohol and/or diol. Particular zeolites synthesized by this method include ZSM-22 and ZSM-23. The use of an alcohol or a diol may inhibit the coformation of ZSM-5. Especially when used to prepare ZSM-23, this method enables the preparation of more catalytically active ZSM-23 of reduced crystallite size and also enables the use of lower crystallization temperatures. Particular mixed organic directing agents for the preparation of ZSM-23 are combinations of (a) pyrrolidine and (b) ethanol or ethylene glycol. Other factors which enhance the activity of ZSM-23 include the use of the following in the reaction mixtures for preparing ZSM-23: potassium ions; precipitated silica particles as sources of silica; and spray dried precipitated silica/alumina particles as sources of silica and alumina. The catalytic stability of alumina bound ZSM-23 catalysts is especially enhanced by steaming. Particular reactions which can be catalyzed by ZSM-23 made according to methods described herein include the dealkylation of ethylbenzene and the alkylation of benzene with ethylene.