The present invention relates to a method for preparing catalyst used for preparing chlorine by oxidizing hydrogen chloride. The method is mixing a slurry mainly containing boron and chromium with a slurry mainly containing copper, boron, alkali-metal elements, rare-earth elements, aluminum sol, silica sol, carrier and optionally other metal elements, the mixing temperature being not more than 100 C., and the residence time being not more than 120 minutes, the mixed slurry is successively treated with spray drying, high temperature calcination, so that the catalyst is obtained. The present invention also relates to the catalyst prepared through the method, use of the catalyst used in the process of preparing chlorine by oxidizing hydrogen chloride and a method for preparing chlorine by using the catalyst. The catalyst is used for preparing chlorine by oxidizing hydrogen chloride with oxygen or air in fluidized bed reactor.

Provided is a catalyst composition using other metals different from noble metals as a catalytic activity component and which has an excellent catalytic activity even after a thermal duration treatment. Provided are an exhaust gas purifying catalyst composition which includes ceria-zirconia particles with a feature in that a peak arising from (111) plane is divided into two peak tops in an XRD pattern and in which a transition metal including at least one of Cu, Cr, Fe, Mn, Co, Ni, and Ag is supported on the ceria-zirconia particles, and a catalyst using the exhaust gas purifying catalyst composition.

A process for preparing hydrogen by a catalytic conversion of sour natural gas, including feeding sour natural gas and one or more H2S recycled streams, optionally mixed with fresh CO2, to a reformer reactor packed with a catalyst activated in-situ by sulfidation. An apparatus for carrying out the process, to convert sour natural gas to sweet natural gas, hydrogen and carbon disulfide, and catalysts that can be used in the process, are also disclosed.

Cu-based catalysts with excellent thermal stability for selective hydrogenation and a preparation method thereof are provided. The method includes: first, six mixed metal salts are instantaneously nucleated in an alkaline solution by the nucleation/crystallization isolation method, to prepare high-entropy composite metal hydroxides (H-LDHs) with uniform element distribution and similar metal proportions. Furthermore, well-crystallized high-entropy oxides (HEOs) are obtained based on the structural topology characteristics of H-LDHs, and a series of Cu-Mx/HEOs catalysts with flexible adjustable catalytic microzone geometries and electronic structures are obtained using the HEOs as precursors.

Disclosed herein is a method for converting ethanol to 1,3-butadiene, wherein the method utilizes H.sub.2 produced during a first step of the method for subsequent conversions involved in the method. In particular aspects, H.sub.2 produced from converting ethanol to acetaldehyde is used to promote the conversion of the acetaldehyde to 1,3-butadiene. The H.sub.2 promotes enhanced catalyst stability, as well as enhanced selectivity and yields of the 1,3-butadiene product. In particular aspects, the method comprises two steps to produce the 1,3-butadiene from the ethanol and H.sub.2 produced from a first step facilitates enhanced selectivities and yields for the second step.

Disclosed herein are aspects of a method for converting an oxygenate feedstock into an olefin-rich product. In some aspects, the method comprises exposing an oxygenate feedstock to a tantalum catalyst composition to form an olefin-rich product. In some aspects, the tantalum catalyst composition comprises tantalum and a support comprising (i) aluminum and/or silicon, and (ii) oxygen.