Selective hydrogenation of cinnamaldehyde to cinnamyl alcohol over BN-supported Pt catalysts at room temperature

被引：58

作者：

Cao, Zhang ^{[1
]}

Bu, Jiahao ^{[1
]}

Zhong, Zeqin ^{[1
]}

Sun, Changyong ^{[1
]}

Zhang, Qingsong ^{[1
]}

Wang, Jiandian ^{[1
]}

Chen, Shihong ^{[1
]}

Xie, Xiaowei ^{[1
]}

机构：

[1] Guangdong Univ Technol, Sch Chem Engn & Light Ind, Key Lab Clean Chem Technol, Guangzhou 510006, Guangdong, Peoples R China

来源：

APPLIED CATALYSIS A-GENERAL | 2019年 / 578卷

基金：

中国国家自然科学基金;

关键词：

Boron nitride; Pt/BN; Selective hydrogenation; Cinnamaldehyde; Cinnamyl alcohol; LIQUID-PHASE HYDROGENATION; BORON-NITRIDE; ALPHA; BETA-UNSATURATED ALDEHYDES; CHEMOSELECTIVE HYDROGENATION; UNSATURATED ALDEHYDES; PLATINUM; PT/SIO2; C=O;

D O I：

10.1016/j.apcata.2019.04.006

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

BN-supported Pt catalysts were prepared by an impregnation method using Pt(NH3)(4)(NO3)(2) as metal precursors and tested in the liquid-phase selective hydrogenation of cinnamaldehyde. It was found that the Pt/BN catalyst exhibited a high performance for the selective C=O hydrogenation at room temperature. A selectivity of over 85% towards cinnamyl alcohol at a cinnamaldehyde conversion of over 95% could be obtained. The effects of supports and Pt particle sizes were explored by N-2 physisorption, XRD, TEM, HRTEM, HAADF-STEM, TPD, H-2-TPR, XPS, CO-DRIFTS, etc. The influences of solvents and operation conditions were investigated, and a simplified kinetics test was also carried out. The comparison of different supports suggested that BN with an inert surface and few acid-base sites possibly favors a simple adsorption mode of cinnamaldehyde dependent only on the supported Pt particles, resulting in a high selectivity to cinnamyl alcohol. While the abundant acid-base surface sites on the Pt/Al2O3 or Pt/SiO2, possibly associated with the multiple adsorption modes of cinnamaldehyde, had an adverse effect on the selective C=O hydrogenation. The investigation of Pt size effect showed that large Pt particles with few low coordinated Pt sites displayed a higher selectivity to cinnamyl alcohol than small Pt particles with more low coordinated Pt sites on the Pt/BN catalysts. It was also revealed that water is a suitable solvent, and the presence of water in a mixture solvent is crucial for achieving a high activity of the Pt/BN in cinnamaldehyde hydrogenation.

引用

页码：105 / 115

页数：11

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