The invention relates to a method of regenerating the catalytic activity of a spent catalyst comprising nickel on a refractory oxide support, said method comprising the steps of contacting the spent catalyst with a nitric acid solution, heat-treating the spent catalyst, calcining and reducing the catalyst.

Processes for converting C8 aromatic hydrocarbons. In some embodiments, the process can include feeding a gaseous hydrocarbon feed that can include meta-xylene, ortho-xylene, or both into a conversion zone. The process can also include contacting the gaseous hydrocarbon feed with a catalyst that can include a ZSM-11 zeolite in the conversion zone under conversion conditions to effect isomerization of at least a portion of any meta-xylene, or at least a portion of any ortho-xylene, or both to produce a conversion product rich in para-xylene. In some embodiments, the ZSM-11 zeolite can have an alpha value of 1 to 3,000 and a molar ratio of silica to alumina of from 15 to 200.

Provided is a catalyst that is free from catalyst deactivation caused by reaction of the support and exhibits good catalytic activity in an ammonia synthesis reaction in a low-temperature, low-pressure process. The present invention relates to an ammonia synthesis catalyst having a structure in which at least one of ruthenium or an oxide of ruthenium is loaded on a titanium suboxide support represented by the composition formula TiOx where x represents a number satisfying 1.5<x<2.0.

A catalyst structure for synthesis gas production of a synthesis gas that contains carbon monoxide and hydrogen, the catalyst structure being provided with a carrier that has a porous structure, while being configured from a zeolite type compound; first catalyst particles that contain one or more iron group elements which are selected from the group consisting of nickel (Ni), iron (Fe) and cobalt (Co); and second catalyst particles that contain one or more platinum group elements which are selected from the group consisting of platinum (Pt), palladium (Pd), rhodium (Rh) and ruthenium (Ru). The catalyst structure for synthesis gas production has passages in communication with each other within the carrier. The first catalyst particles are present at least in the passages of the carrier; and the second catalyst particles are present at least either inside the carrier or on the outer surface of the carrier.

The structured catalyst for oxidation for exhaust gas purification includes a support having a porous structure constituted by a zeolite-type compound, and at least one type of oxidation catalyst that is present in the support and selected from the group consisting of metal and metal oxide, the support having channels that communicate with each other, and the oxidation catalyst being present in at least the channels of the support.

A preparation method for a highly chlorine- and water-resistant catalyst is provided. A mixture of at least one of SnO.sub.2, GeO.sub.2, and MoO.sub.2 with CeO.sub.2 is used as a catalyst support, face-centered cubic ruthenium oxide is used as an active component, and the catalyst with excellent chlorine- and water-resistance is prepared through selective adsorption regulation, which can realize safe and efficient purification of chlorine-containing organic waste gas at temperatures below 250° C.

A method of preparing hydrodesulfurization catalysts having cobalt and molybdenum sulfide deposited on a support material containing mesoporous silica. The method utilizes a sulfur-containing silane that dually functions as a silica source and a sulfur precursor. The method involves an one-pot strategy for hydrothermal treatment and a single-step calcination and sulfidation procedure. The application of the hydrodesulfurization catalysts in treating a hydrocarbon feedstock containing sulfur compounds to produce a desulfurized hydrocarbon stream is also specified.

Disclosed herein is a catalyst composite containing a perovskite-oxide and an oxide support, methods of preparing a catalyst composite containing a perovskite-oxide and an oxide support, and the use thereof for CO.sub.2 conversion by a reverse water gas shift chemical looping (RWGS-CL) process.

The present disclosure relates to a process for converting one or more methyl halides to acyclic C3-C6 olefins, said process comprising the steps of (a) providing a feedstream comprising one or more methyl halides; (b) providing a catalyst composition; and (c) contacting said feedstream with said catalyst composition under reaction conditions. The process is remarkable in that said reaction conditions include a reaction temperature below 400° C., and in that said catalyst composition comprises one or more molecular sieves with a Si/Al atomic ratio ranging from 2 to 18 and wherein said one or more molecular sieves comprise a plurality of pores, wherein said pores have a shape of an 8-membered ring or less.

An ethylbenzene dealkylation catalyst composition comprising a ZSM-5 type zeolite as a carrier component, wherein said zeolite has been synthesized from an aqueous reaction mixture comprising one or more alumina sources, one or more silica sources, one or more alkali sources, and one or more primary and/or secondary amines and wherein the ZSM-5 type zeolite has a number average crystallite size in the range of from 1 to 10 μm and a molar silica-to-alumina ratio (SAR) in the range of from 30 to 70; a method for reducing xylene losses in an ethylbenzene dealkylation process, said method comprising conducting the ethylbenzene dealklylation process in the presence of the afore-mentioned catalyst composition; and a process for the dealkylation of ethylbenzene, which process comprises contacting, in the presence of hydrogen, a feedstock which comprises ethylbenzene with said catalyst composition.