摘要:
The present invention relates to a hydrocarbon conversion catalyst comprising i) a catalyst, in oxidic form, metals M1, M2, M3 and M4, wherein: M1 is selected from Si, Al, Zr, and mixtures thereof; M2 is selected from Pt, Cr, and mixtures thereof; M3 is selected from W, Mo, Re and mixtures thereof; M4 is selected from Sn, K, Y, Yb and mixtures thereof; and ii) a hydrogen scavenger selected from at least one alkali and/or alkaline earth metal derivative, preferably in metallic, hydride, salt, complex or alloy form; as well as a hydrocarbon conversion process utilizing this catalyst.
摘要:
A method is provided for improving the performance of a silver-based epoxidation catalyst comprising a carrier. The carrier includes at least 80 percent alpha alumina and has a pore volume from 0.3 mL/g to 1.2 mL/g, a surface area from 0.3 m2/g to 3.0 m2/g, and a pore architecture that provides at least one of a tortuosity of 7 or less, a constriction of 4 or less and a permeability of 30 mdarcys or greater. A catalytic amount of silver and a promoting amount of one or more promoters is disposed on and/or in said carrier. The method further includes the steps of initiating an epoxidation reaction by reacting a feed gas composition containing ethylene and oxygen present in a ratio of from about 3.5:1 to about 12:1, in the presence of the silver-based epoxidation catalyst at a temperature of about 200° C. to about 230° C., and subsequently increasing the temperature either stepwise or continuously.
摘要:
An organic reductant, in particular an organo silicon reductant suitable for activating supported catalysts of the type MOnEm, wherein E is S and/or Se, in particular MOn, wherein M is W, Mo or Re, is described as well as its use in metathesis reactions. The reduced catalysts are able to metathesize olefins at low temperatures and are therefore also suitable for metathesis of functionalized olefins.
摘要:
Provided is a photocatalytic composition comprising zinc (Zn) doped titanium dioxide (TiO2) nanoparticles, wherein the ratio of titanium dioxide nanoparticles to zinc is from about 5 to about 150. The photocatalytic composition absorbs electromagnetic radiation in a wavelength range from about 200 nm to about 500 nm, and the absorbance of light of wavelengths longer than about 450 nm is less than 50% the absorbance of light of wavelengths shorter than about 350 nm.
摘要:
The present invention relates to catalyst comprising at least one transition metal selected from Group VIA and Group VITA metals and a support containing a mixture of 0.1 to 60 percent by weight of zeolite, based on total weight of the support, with at least one other inorganic or organic material, wherein the at least one other inorganic or organic material is selected from silicon dioxide, titanium dioxide, zirconium dioxide and activated carbon, preferably silicon dioxide; and a process for olefin metathesis utilizing that catalyst.
摘要:
A precursor mixture for producing a porous body, wherein the precursor mixture comprises: (i) milled alpha alumina powder having a particle size of 0.1 to 6 microns, (ii) boehmite powder that functions as a binder of the alpha alumina powders, and (iii) burnout materials having a particle sizes of 1-10 microns. In some embodiments, an unmilled alpha alumina powder having a particle size of 10 to 100 microns is also included in said precursor mixture. Also described herein is a method for producing a porous body in which the above-described precursor mixture is formed to a given shape, and subjected to a heat treatment step in which the formed shape is sintered to produce the porous body.
摘要:
The invention relates to a catalyst composition comprising (a) a metal M selected from the group consisting of platinum (Pt), palladium (Pd), rhodium (Rh), rhenium (Re), ruthenium (Ru) and iridium (Ir), (b) tin (Sn), (c) zinc (Zn), (d) alkaline earth metal and (e) a porous metal oxide catalyst support, wherein the amount of each of elements (a), (b) and (d) is independently chosen in the range of from 0.1 to 5 wt. % based on the porous metal oxide catalyst support and wherein the amount of element (c) is chosen in the range of from 0.1 to 2 wt. % based on the porous metal oxide catalyst support. Furthermore, the invention also relates to a process for the preparation of said catalyst composition and its use in non-oxidative dehydrogenation of an alkane, preferably propane.
摘要:
A process for selective formation of ethanol from acetic acid includes contacting a feed stream containing acetic acid and hydrogen at an elevated temperature with catalyst comprising platinum and tin on a high surface area silica promoted with calcium metasilicate. Selectivities to ethanol of over 85% are achieved at 280° C. with catalyst life in the hundreds of hours.
摘要:
A catalytic water gas shift process at temperatures above about 450° C. up to about 900° C. or so wherein the catalyst includes rhenium deposited on a support, preferably without a precious metal, wherein the support is prepared from a high surface area material, such as a mixed metal oxide, particularly a mixture of zirconia and ceria, to which may be added one or more of a high surface area transitional alumina, an alkali or alkaline earth metal dopant and/or an additional dopant selected from Ga, Nd, Pr, W, Ge, Fe, oxides thereof and mixtures thereof.
摘要:
Provided is a resin-supported catalyst including a cured body of a thermosetting resin and fine particles having catalytic activity supported onto the surface of the cured body, in which the thermosetting resin has a phenolic hydroxyl group.