A method for preparing a zeolite catalyst for catalytic cracking of hydrocarbons to produce propylene is provided, which specifically includes steps of mixing a silicon source, a templating agent, an aluminium source, and a solvent to form a zeolite precursor solution, which is then subjected to hydrothermal crystallization, washing, drying, and calcination to obtain a zeolite precursor; ion-exchanging the zeolite precursor with ammonium ions, followed by drying and calcination; and loading aluminum onto the ion-exchanged zeolite precursor as a carrier via incipient-wetness impregnation by using an aluminium-containing solution, followed by drying and calcination. Zeolite catalysts prepared by the method and use of the catalysts in catalytic cracking of hydrocarbons to produce propylene are also provided.

The disclosure is related to the field of preparation of nanometer materials, and, in particular, to a method for synthesizing a 2D ultrathin zeolitic imidazolate framework-67 (ZIF-67) with a hierarchical porous structure, the method converting ZIF-67 from nanoparticles into 2D ultrathin nanosheets with a hierarchical porous structure by controlling a dropping amount of water and the reaction time. With the method, the 2D ultrathin ZIF-67 with a hierarchical porous structure can be made from readily available starting materials in a one pot synthesis. The method is feasible on industrial scale and has both economic and environmental benefits due to the simple process and low cost.

The present disclosure generally relates to a denitration catalyst, and in particular to a method for preparing the denitration catalyst. The present disclosure also relates to a method for preparing a coated substrate comprising the denitration catalyst. The present invention also relates to use of the denitration catalyst and/or coated substrate at low temperatures and/or humid environments.

The present disclosure provides an active material comprising a mixed metal oxide in a hydrotalcite derived rocksalt structure, a processes to convert paraffins to corresponding olefins and or heavier hydrocarbons using the active material, and a method of preparing the active material.

A powdered catalyst material on a titanium oxide basis. The powdered catalyst material includes a combined content of at least 90 wt.-% of a hydrated titanium oxide having the general formula TiO.sub.(2-x)(OH).sub.2x, with 0<x≤1, (calculated as TiO.sub.2), and a silicon dioxide and hydrated precursors of the silicon dioxide (calculated as SiO.sub.2). A weight ratio of TiO.sub.2/SiO.sub.2, determined for TiO.sub.2 and SiO.sub.2 respectively, is at least 3 and less than 30. The wt.-% is based on a total weight of the catalyst material after the catalyst material has been dried at 105° C. for at least 2 hours. The powdered catalyst material has a specific surface area of >300 m.sup.2/g and an isoelectric point of from 4.0 to 7.0.

An object of the present invention is to provide a catalyst ensuring that when a gas-phase catalytic oxidation reaction of a material substance is conducted using a catalyst to produce a target substance, the pressure loss and coking are suppressed and the target substance can be produced in high yield. The present invention is related to a ring-shaped catalyst having a straight body part and a hollow body part, which is used when a gas-phase catalytic oxidation reaction of a material substance is conducted to produce a target substance, wherein a length of the straight body part is shorter than a length of the hollow body part and at least at one end part, a region from an end part of the straight body part to an end part of the hollow body part is concavely curved.

Disclosed are a catalyst including copper (Cu) particles having specific properties as an active metal dispersed and supported on an alumina support, a method of preparing the same, and a method of hydrogenating furan-based compounds such as 5-(hydroxymethyl)furfural (HMF) derived from biomass with a high selective conversion and high efficiency using the catalyst.

A process for synthesis of PtNi high surface area core/shell particles. The processing including formation of PtNi nanoparticles, exposure of the PtNi nanoparticles to oxygen to form a nickel oxide coating on the nanoparticles at the same time the segregation of Ni to surface induces a Pt-skin with PtNi core structure, removal of the nickel oxide coating to form PtNi core/Pt shell (or Pt-skin) structure.

A catalyst for use in chemical looping combustion is provided. The catalyst includes a mixture of metal oxides dispersed on a ceramic support. The mixture of metal oxides forms a nickel tungsten oxide (NiWO.sub.4) interaction complex which functions as an oxygen carrier in the chemical looping combustion reaction.

Provided is a catalyst for oxidative dehydrogenation, a method of preparing the catalyst, and a method of performing oxidative dehydrogenation using the catalyst. The catalyst for oxidative dehydrogenation has improved durability and fillability by including a porous support coated with a metal oxide (AB.sub.2O.sub.4) according to Equation 1:
X wt %+Y wt %=100 wt %,  <Equation 1> wherein X is a content of AB.sub.2O.sub.4 and is 5 or more and less than 30, and Y is a content of the porous support and is more than 70 and 95 or less,
wherein the metal oxide exhibits activity during oxidative dehydrogenation. Therefore, when the catalyst is used in oxidative dehydrogenation of butene, the conversion rate of butene and the selectivity and yield of butadiene may be greatly improved.