Multilayer Nb2CTx (MXene) Supports CoB for the Selective Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol: Effect of the Electron-Modified CoB Site and Lewis Acid Site

A heterogeneous CoB/Nb 2 CT x catalyst was successfully prepared by in situ wet reduction of Co metal ions electrostatically adsorbed on the surface of Nb 2 CT x and applied to the selective hydrogenation of cinnamaldehyde (CAL). The 10 wt% CoB/Nb 2 CT x catalyst exhibited superior catalytic activit...

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Bibliographic Details
Published inCatalysis letters Vol. 154; no. 8; pp. 4457 - 4468
Main Authors Li, Qingqing, Shi, Haixiang, Su, Tongming, Luo, Xuan, Xie, Xinling, Qin, Zuzeng, Ji, Hongbing
Format Journal Article
LanguageEnglish
Published New York Springer US 01.08.2024
Subjects
Catalysis
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Organometallic Chemistry
Physical Chemistry
CT
Cinnamaldehyde hydrogenation
Nb
Co
Lewis acid sites
MXene
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Summary:A heterogeneous CoB/Nb 2 CT x catalyst was successfully prepared by in situ wet reduction of Co metal ions electrostatically adsorbed on the surface of Nb 2 CT x and applied to the selective hydrogenation of cinnamaldehyde (CAL). The 10 wt% CoB/Nb 2 CT x catalyst exhibited superior catalytic activity with a CAL conversion of 90.4% and a cinnamyl alcohol (COL) selectivity of 75.4%, while unsupported CoB showed a CAL conversion of only 24%. The characterization results showed that CoB was dispersed on the surface and in the Nb 2 CT x layers, and CoB/Nb 2 CT x exposed more effective active sites than CoB alone, leading to higher hydrogenation activities. In addition, the transfer of electrons from B to Co increased the electron density of Co, which rejects the adsorption on the C=C bond. A strong electronic effect existed between the dispersed surface CoB and Nb 2 CT x , and B contributed electrons to Nb 2 CT x , resulting in the formation of more electron-deficient B species, which serve as electrophilic sites for C=O adsorption. Moreover, Lewis acid sites on the surface of Nb 2 CT x were conducive to the adsorption of C=O bonds. The electron-deficient B and the Lewis acid site on the surface of CoB/Nb 2 CT x promoted the adsorption of C=O, resulting in a high yield of COL from CoB/Nb 2 CT x . Graphical Abstract
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-024-04642-w