The liquid-phase hydrogenation of 1-heptyne over Pd–Au/TiO2 catalysts prepared by the combination of incipient wetness impregnation and deposition–precipitation

Kittisakmontree Prathan; Pongthawornsakun Boontida; Yoshida Hiroshi; Fujita Shin-ichiro; Arai Masahiko; Panpranot Joongjai

Title	en The liquid-phase hydrogenation of 1-heptyne over Pd–Au/TiO2 catalysts prepared by the combination of incipient wetness impregnation and deposition–precipitation
Creator	en Kittisakmontree, Prathan en Pongthawornsakun, Boontida en Yoshida, Hiroshi NRID 1000020027410 en Fujita, Shin-ichiro NRID 1000080156869 en Arai, Masahiko NRID 1000060125490 en Panpranot, Joongjai
Accessrights	open access
Subject	Other en 1-Heptyne Other en Selective hydrogenation Other en Liquid-phase hydrogenation Other ja Pd–Au bimetallic catalysts NDC 430
Description	Abstract en TiO2-supported Pd–Au catalysts were prepared with Pd (0.5 wt%) by impregnation and then Au (1.0 wt%) by deposition–precipitation (Au/Pd/TiO2) and vice versa (Pd/Au/TiO2). For the former sample, the state of dispersion of Pd on TiO2 changed during the loading of Au, resulting in the formation of small Au–Pd alloy particles and thus changing the electronic properties of Pd species. The alloy formation was not clearly detected on the Pd/Au/TiO2, and the electronic properties of Pd were not so different from those of monometallic Pd/TiO2. All the catalysts were selective to 1-heptene (>95%) until close to the complete conversion of 1-heptyne. However, the selectivity of 1-heptene drastically decreased to 0% (which was further hydrogenated to heptane) in 120 min for the Au/Pd/TiO2 while it still remained >60% for the Pd/Au/TiO2 similar to the monometallic Pd/TiO2 catalyst. The rate of 1-heptene hydrogenation (in the second step) did not depend on the Pd dispersion but was found to be greatly enhanced as the Pd species became electron-rich in the Au–Pd alloy particles. The modification of Pd species by Au was less significant for the first step of hydrogenation of 1-heptyne to 1-heptene.
Publisher	en Elsevier
Date	Issued2013-01
Language	eng
Resource Type	journal article
Version Type	AM
Identifier	HDL http://hdl.handle.net/2115/52085
Relation	URI http://www.sciencedirect.com/science/article/pii/S002195171200320X isVersionOf DOI https://doi.org/10.1016/j.jcat.2012.10.007
Journal	PISSN 0021-9517 NCID AA00694787 en Journal of Catalysis Volume Number297 Page Start155 Page End164
File	fulltext joc297_155-164.pdf 1.19 MB (application/pdf) Issued2013-01
Oaidate	2023-07-26