Beijing University of Chemical Tehcnology

Junting Feng

Dianqing Li

Yufei He

Yanan Liu

Qian Wang

Rui Ma

Fengzhi Fu

Jiaxuan Fan

Xiaoxue Yue

Yongjun Feng

Xiaoyan Ma

The present invention discloses a catalyst for in-situ CO2 capture and coupling reduction with biomass oxidation, a preparation method therefor and an application thereof. The catalyst is applied to the coupling reaction of photocatalytic CO2 reduction and biomass oxidation. The preparation of the catalyst is to synthesize layered double hydroxides (LDHs) containing CO32− between layers by using coprecipitation method, hydrothermal method, sol-gel method and the like, wherein the chemical formula is [M1−x2+Mx3+(OH)2]x+(An−)x/n·mH2O, which has a thickness of 20-30 nm and an average particle diameter of 60-90 nm. Then metal ion vacancy defects are produced on LDHs laminate by using a NaOH/KOH selective etching to obtain the corresponding catalyst. The catalyst is used in photocatalytic reaction, characterized in that CO32− is continuously consumed in the reaction process, and the catalyst can absorb CO2 in the air for recovery after the reaction, and can be repeatedly used to continuously consume CO2 in the air, thus realizing the direct capture and effective utilization of CO2.

Catalyst for COcapture and conversion coupling with biomass oxidation, a preparation method therefor and an application thereof

Cu/MMgOinterfacial catalyst for selective alkyne hydrogenation and its preparation method are disclosed. The preparation method of the catalyst includes: the mixture of salt and alkali solution is nucleated momentarily by nucleation/crystallization isolation method, preparing the composite metal hydroxide CuMMg-LDHs as precursor, which has typical hexagonal morphology of the double hydroxide; the precursor is topologically transformed by heat treatment to produce unsaturated oxide; the catalyst with Cu-MMgOinterface structure is prepared by separating and electronically modifying Cu particles. By adjusting the ratio of Cu/Min LDHs, the electronic and geometric structure of Cu-MMgOinterface can be flexibly controlled, thus enhancing the reaction activity, product selectivity and stability. The catalyst can be used in the selective hydrogenation of various alkynes in the fields of petrochemical and fine chemical industry, with the outstanding catalytic activity and C&#x2550;C double bond selectivity. The catalyst also has good reusability.

Cu/MMgOinterfacial catalyst for selective alkyne hydrogenation and its preparation method

The purpose of the invention is to provide a supported bimetallic core-shell structure catalyst and its preparation method. Supporter, metal salt and reducing agent solution are mixed to synthesize the catalyst M@PdM/ZT by using a one-step synthesis method, wherein the active metal particle M@PdM as core-shell structure, M Is the core representing one of the Ag, Pt, Au and Ir. ZT is the supporter, representing one of hydrotalcite (MgAl-LDH), alumina (AlO) and silica (SiO). By changing the temperature and the reaction time to control the kinetic behavior of the reduction of two kinds of metal ions to realize the construction of core-shell structure. Active metal particle composition and shell thickness are regulated by controlling metal ion concentration. The bimetallic core-shell catalyst prepared by this method showed excellent selectivity and stability in acetylene selective hydrogenation and anthraquinone hydrogenation.

Supported bimetallic core-shell structure catalyst and its preparation method

A process for preparing supported noble metal catalyst in situ is provided by mixing and crystallizing hexamethylenetetramine, soluble divalent metal salts solution, Al2O3 carriers and soluble noble metal salts solution wherein the hexamethylenetetramine is used as a precipitating agent for preparing hydrotalcite and a reducing agent of noble metal precursor. During the growth process of hydrotalcite, Al3+ on the Al2O3 carrier's surface is directly used as the trivalent metal ions in the laminate structure and the hydrotalcite is obtained on the surface of the Al2O3 carriers by in-situ growth. A supported catalyst Me-LDHs-Al2O3 containing an elementary noble metal is produced wherein the noble metal element particle in the catalyst has a particle size of 10 to 60 nm, and is evenly and stably dispersed on or between slabs of the hydrotalcite.

Supported noble metal catalyst and process for preparing the same in situ

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Beijing, China

Junting Feng