摘要:
A process for preparing an epoxidation catalyst comprising silver and a high-selectivity dopant on a support, which process comprises depositing a base having a pKb of at most 3.5 when measured in water at 25° C., on the support prior to depositing silver on the support, and depositing silver and a high-selectivity dopant on the support; the epoxidation catalyst; and a process for preparing an olefin oxide by reacting an olefin with oxygen in the presence of the epoxidation catalyst.
摘要:
In a catalyst process involving a conversion reaction for organic compounds, e.g. hydrogenations, the catalyst contains at least one support and at least one metal, and is characterized in that it has particles of an average size greater than approximately 1 nm, and more than 80% of particles, the size of which is comprised in the range Dnull(D.0.2) where D represents the average size of the particles. The catalyst is prepared in a colloidal suspension, in aqueous phase, of the metal oxide or metals to be supported, then depositing this suspension on a support, and optionally reducing the oxide thus supported.
摘要:
This invention is directed to a catalyst that comprises (i) an acidic solid oxide component comprising an oxide of a Group IVB metal modified with an anion or oxyanion of a Group VIB metal, and (ii) a Group IB metal or metal oxide component. This catalyst may be used, for example, to isomerize paraffins.
摘要:
A catalyst for obtaining pyromellitic anhydride at a high raw material gas concentration with high yield and a method for the production of pyromellitic anhydride are provided. The catalyst containing vanadium and silver as essential component elements for catalyst and having an atomic ratio of silver to vanadium in the range of from 0.001 to 0.2 allows efficient production of pyromellitic anhydride by the vapor-phase oxidation of a tetraalkylbenzene with a molecular oxygen-containing gas. The method of this invention accomplishes the production of pyromellitic anhydride by the use of the catalyst.
摘要:
There is provided a catalytic method for converting nitrogen oxides to nitrogen (i.e., N.sub.2). The catalyst for this method comprises an acidic solid component comprising a Group IVB metal oxide modified with an oxyanion of a Group VIB metal. An example of this catalyst is zirconia, modified with tungstate. This method may be used for reducing emissions of nitrogen oxides from waste gases, including industrial exhaust gases and automobile exhaust gases. In a particular embodiment, nitrogen oxides in waste gases may be reacted with ammonia before the waste gases are discharged to the atmosphere.
摘要:
Catalysts for the epoxidation of ethylene in the vapor phase comprise silver impregnated support having thereon at least one cation promoter and oxyanion promoter comprising (i) sulfate anion, (ii) fluoride anion and (iii) oxyanion of an element of Group 3b to 6b, inclusive, of the Periodic Table, wherein the amount of fluoride anion is sufficient to reduce ethylene oxide burning.
摘要:
Catalytic vapor phase process wherein the feed stream comprising, on a molar basis, the sum of which is 100%, 10-32% of at least one linear unsaturated C.sub.4 -hydrocarbon selected from 1-butene, 2-butene and 1,3-butadiene, 10-25% oxygen, 3-30% water and 13-77% inert diluent, is contacted with a modified bismuth molybdenum oxide catalyst at 350.degree.-600.degree. C. at a pressure of at least 1 atmosphere (about 100 kPa) for 0.1-10 seconds, said catalyst being selected from:(a) BiMo.sub.a M.sub.b Q.sub.c R.sub.d O.sub.x wherein M is at least one element selected from In, Ce, Cr, Fe and Cu, Q is at least one element selected from V, P, Sb and Te, R is Na or Ag, a is 0.7-60.0, b is 0.1-33.0, c is 0-7.0, d is 0-1.5 and x is such a number as is necessary to satisfy the valences of the elements, with the proviso that a/1+b.gtoreq.0.5 and a/1+b+c.gtoreq.0.19 and the proviso that c>0 when d>0; and(b) BiMo.sub.a As.sub.b Z.sub.c O.sub.x wherein Z is at least one element selected from Na and Ca, a is 1.3-2.0, b is 0.1-0.3, c is 0.3-0.7 and x is such a number as is necessary to satisfy the valences of the elements, to produce an off-gas containing at least 1% furan.
摘要:
Novel regenerable catalyst-reagents, and a new and improved process utilizing said regenerable catalyst-reagents, for the conversion, and oligomerization of hydrocarbons, notably methane, at relatively low temperatures to produce products rich in ethylene or benzene, or both, usually in admixture with other hydrocarbons; and process for the regeneration of said catalyst-reagents. (a) The catalyst-reagents are multi-functional and are comprised of (1) a Group VIII noble metal having an atomic number of 45 or greater, nickel, or a Group I-B noble metal having an atomic number of 47 or greater; (2) a Group VI-B metal oxide which is capable of being reduced to a lower oxide, or admixture of metal oxides which includes one or more of such metal oxides; and, (3) a Group II-A metal or alkaline-earth metal, composited with a suitably passivated, spinel-coated refractory support, notably an inorganic oxide support, preferably alumina.
摘要:
The main problem addressed by the present invention is to provide a supported gold nanoparticle catalyst and having high catalytic activity. The above-mentioned problem can be solved by a supported catalyst comprising: a carrier having a reducing power; and gold nanoparticle with an average particle diameter of 100 nm or less, and preferably with an average particle diameters of 5 nm or less supported on the carrier. The present invention also provides a method for producing the supported catalyst.
摘要:
An acyloxylation catalyst is obtained by loading (a) a first component containing at least one element of Groups 8, 9, 10 and 11 of the Periodic Table, (b) a second component containing an element which is at least one element of Groups 8, 9, 10 and 11 of the Periodic Table and which is different from the element of the first component, and (c) a third component containing an element which is a component that produces a precipitation-starting pH below the precipitation-starting pH of the first component and second component and which is different from the elements of the first component and second component, onto (d) a support. A catalyst is obtained that can be used to efficiently carry out acyloxylation for economical production of acyloxylated compounds.