ACS Catalysis p. 6425 - 6434 (2019)
Update date:2022-08-05
Topics: Catalyst Pt TiH2 Ionic Hydrogenation Stored Hydrides Gaseous H2
Wu, Qifan
Zhang, Chao
Arai, Masahiko
Zhang, Bin
Shi, Ruhui
Wu, Peixuan
Wang, Zhuangqing
Liu, Qiang
Liu, Ke
Lin, Weiwei
Cheng, Haiyang
Zhao, Fengyu
A Pt/TiH2 catalyst having hydrogen storage and release capability was investigated for selective hydrogenation of trans-cinnamaldehyde (CAL) to cinnamyl alcohol (COL) with gaseous dihydrogen. The catalytic behavior of this catalyst was significantly different from that of a reference Pt/TiO2 catalyst with respect to the product selectivity and the hydrogenation mechanism. The Pt/TiH2 catalyst showed a COL selectivity of 97% at a CAL conversion of 98%, which was ascribed to the function of a Pt crystallite-support boundary layer that caused the preferential adsorption of CAL with its carbonyl group. Furthermore, the carbonyl group was hydrogenated by hydride species (H+, H-) supplied from the support and the hydride species consumed were compensated from gaseous dihydrogen; hydrogen atoms were formed by ordinary homolytic cleavage on Pt and then these hydrogen atoms moved onto the surface of TiH2 and diffused into the bulk of the support, during which those simultaneously changed to hydride species (H+, H-) via electron transfer with titanium species and hydride vacancies therein. The surface and bulk diffusion of the hydrogen atoms from Pt to TiH2 support should be the dominant step rather than their addition to the carbonyl group of CAL (ordinary hydrogenation). That is, ionic hydrogenation occurs with Pt/TiH2 in the presence of gaseous dihydrogen.
View MoreContact:+86-371-86058576
Address:NO.32, Jingsan Road, Zhengzhou, China
SHIFANG SUHONG CHEMICAL CO.,LTD
Contact:+86-838-2224563
Address:Room 1207 Zongchen Sunshine No.128 Taishan South Road,Deyang City,Sichuan China
Zhengzhou Xinlian Chemical Tech Co. ,Ltd
Contact:0371-65771781 021-52042910
Address:H Part, Building I, No. 700 Gonglu Road, Pudong New Area, Shanghai
Shanghai Dano Pharmaceutical Co.,Ld.
Contact:+86-592-6266840
Address:Building 1 Room 512, 720 Cailun Rd, Zhangjiang High-Tech Park, Shanghai 201203, China
SHANDONG QINGYUNCHANGXIN CHEMICAL SCIENCE-TECH CO.,LTD
Contact:86-21-60560171
Address:1689Donghuan Rade,Qingyun County, Dezhou City, Shandong,China
Doi:10.1071/C97159
(1997)Doi:10.1039/P19920003257
(1992)Doi:10.1023/A:1015387108748
(2002)Doi:10.1021/jm00345a009
(1982)Doi:10.1007/BF00962277
(1981)Doi:10.1021/ja01186a013
(1948)