This invention provides a preparation method of a catalyst for preferential oxidization of CO in a hydrogen-enriched atmosphere, and a catalyst product obtained from the method and its applications thereof. Particularly, in this invention, a wide-temperature catalyst for preferential oxidization of CO in a hydrogen-enriched atmosphere is obtained by depositing one or more of an iron oxide, cobalt oxide, and nickel oxide as a promoter onto the surface of a supported Pt-group noble metal catalyst precursor via chemical vapor deposition or atomic layer deposition. In the wide-temperature catalyst, the active noble metal component has a content of 0.1 to 10 wt %, and the promoter has a content of 0.1 to 10 wt % in terms of the metal element thereof. In the reaction of preferential oxidation of CO in a hydrogen-enriched atmosphere, the catalyst prepared by this invention can exhibit excellent catalytic performance and can achieve high conversion of CO with high selectivity in a wide temperature range of −80 to 200° C., for example. Also, the catalyst can remain stable for a long time even in a case where steam and CO.sub.2 are present in the hydrogen-enriched atmosphere.

The invention provides an oxygen storage material having high oxygen storage capacity and high thermal durability. The oxygen storage material of the invention has some of the La sites of La.sub.2CuO.sub.4 with a K.sub.2NiF.sub.4-type crystal structure replaced by Ce. The oxygen storage material may have the composition La.sub.(2.00-x)Ce.sub.xCuO.sub.4 (0.20≥×>0.00). The oxygen storage material may also have a precious metal supported. The precious metal may be Pt, Pd or Rh. The exhaust gas purification catalyst is an exhaust gas purification catalyst comprising an oxygen storage material according to the invention.

A preparation method of Cu—Pd—CeO.sub.2/γ-Al.sub.2O.sub.3@NP catalyst and a synthesis method of benzopyrazine compounds. The preparation method of the Cu—Pd—CeO.sub.2/γ-Al.sub.2O.sub.3@NP catalyst comprises the following steps: (1) preparing a CeO.sub.2/γ-Al.sub.2O.sub.3 carrier; (2) preparing a CeO.sub.2/γ-Al.sub.2O.sub.3@NP carrier; (3) preparing the Cu—Pd—CeO.sub.2/γ-Al.sub.2O.sub.3@NP catalyst by impregnation method. A one-pot method for synthesizing benzopyrazine compounds of formula (III) includes using an o-nitroaniline compound of formula (I) and an aliphatic diol compound of formula (II) as raw materials, carrying out the one-pot synthesis of the benzopyrazine compound of formula (III) under solvent-free condition and under the combined action of the Cu—Pd—CeO.sub.2/γ-Al.sub.2O.sub.3@NP catalyst prepared by the method and an alkali. The Cu—Pd—CeO.sub.2/γ-Al.sub.2O.sub.3@NP catalyst increases the number of basic sites by doping N and P, and meanwhile loads CeO.sub.2 to assist in the extraction of protons, thereby improving the dehydrogenation activity and product selectivity.

A method for producing a Guerbet alcohol, including reacting a raw material alcohol having 8 or more and 22 or less carbon atoms, in the presence of a catalyst (A) containing a first component, a second component, and a third component below: first component: copper, second component: one kind selected from the group consisting of cobalt, nickel, molybdenum, and rhenium, and third component: at least one kind selected from the group consisting of elements that are elements belonging to Groups 3 to 10 and 12 of the fourth period of the periodic table and elements belonging to Groups 3 to 7, 11, and 12 of the fifth and sixth periods of the periodic table, and are different from the element selected as the second component.

The present disclosure is directed to a system for treating an exhaust gas stream from an engine, which includes a diesel oxidation catalyst (DOC) located downstream of the engine and adapted for oxidation of hydrocarbons and carbon monoxide, an injector adapted for the addition of a reductant to the exhaust gas stream located downstream of the DOC, a catalyzed soot filter (CSF) located downstream of the injector, and a selective catalytic reduction component adapted for the oxidation of nitrogen oxides located downstream of the CSF. The CSF is adapted for oxidizing hydrocarbons and includes a selective oxidation catalyst composition on a filter with high selectivity ratio for hydrocarbon oxidation:ammonia oxidation (e.g., at least 0.6).

Disclosed herein are composite materials and methods of making and use thereof. The composite materials disclosed herein can comprise: a first metal oxide particle having a thermal stability and a specific reversible oxygen storage capacity, wherein the first metal oxide particle comprises a first metal oxide comprising a transition metal oxide; and a second metal oxide disposed on the first metal oxide particle; wherein the composite material has a thermal stability and a specific reversible oxygen storage capacity; and wherein the thermal stability of the composite material is greater than the thermal stability of the first metal oxide particle. The methods of use of the composite materials described herein can comprise using the composite material as a catalyst, as an oxygen carrier, as a catalyst support, in a fuel cell, in a catalytic converter, or a combination thereof.

A catalyst for wastewater treatment is disclosed. The catalyst includes a porous carrier, iron oxide impregnated into the pores of the porous carrier, and platinum impregnated into the pores and mixed with the iron oxide in the pores. Also disclosed are a method for preparing the catalyst and a method for wastewater treatment using the catalyst.

A precious metal-supported eggshell catalyst with a preparation method and an application are provided. The precious metal-supported eggshell catalyst includes a carrier, a precious metal and a promoter. As an active component, the precious metal and the promoter are evenly distributed on surface of the carrier, wherein the promoter includes one or more than two of a precious metal, an alkaline earth metal, a transition metal lanthanide series metal, an actinium series metal and/or a metal oxide thereof. With a highly utilization of the precious metal, the precious metal-supported eggshell catalyst showed high conversion, good selectivity and excellent stability, and the precious metal-supported eggshell catalyst is used more than 300 hours with no obvious loss of activity in preparing 1,3-propanediol through hydrogenation of 3-hydroxypropionaldehyde aqueous solution. Furthermore, with large particles the precious metal-supported eggshell catalyst is easily separated from reaction products.

In one aspect, the disclosure relates to relates to CO.sub.2-free methods of co-producing hydrogen and solid forms of carbon via methane decomposition. The methods are efficient, self-sustaining, and environmentally sound. In a further aspect, the disclosure relates to recyclable and recoverable catalysts supported by solid forms of carbon and methods for recycling the catalysts. In some aspects, the disclosure relates to catalysts that do not require support by solid forms of carbon. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.

Core-shell nanoparticles having a solid core comprising a first metal and a shell comprising a second metal disposed at least a portion of the exterior surface of the core. The core-shell nanoparticles comprise a non-precious transition metal and the second metal comprises a precious metal or semi-precious metal. The core-shell nanoparticles can be used to catalyze oxygen reduction reactions. Also provided are compositions comprising the core-shell nanoparticles, methods of making same, and devices of same.