TY - JOUR
T1 - Impact of catalyst reduction mode on selective hydrogenation of cinnamaldehyde over Ru-Sn sol-gel catalysts
AU - Hájek, Jan
AU - Kumar, Narendra
AU - Salmi, Tapio
AU - Murzin, Dmitry Yu
AU - Karhu, Hannu
AU - Väyrynen, Juhani
AU - Červený, Libor
AU - Paseka, Ivo
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2003/1
Y1 - 2003/1
N2 - This work is focused on the investigation and chemical reduction improvement of sol-gel Ru-Sn/SiO2 catalysts. To clarify the reduction effect, the catalysts were characterized by a range of techniques [e.g., X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller analysis, pore size distribution, X-ray fluorescence, elementary analysis]. Liquid-phase hydrogenation of cinnamaldehyde (433 K, 70 bar, 2-propanol) was performed in order to evaluate the catalytic properties of synthesized materials. Conventional ruthenium- and sodium-modified catalysts yielded mainly saturated aldehyde, while reduced and nonreduced sol-gel catalysts afforded the formation of unsaturated alcohol with high selectivity. Chemical reduction was essential to increase the catalyst activity. A higher Sn/Ru ratio improved the selectivity to unsaturated alcohol in the cases of reduced and sodium-modified catalysts. Catalyst reduction is essential for the removal of chlorine and carbon residues. The novel coulometric method showed an increase of ruthenium surfaces in reduced catalysts. According to XPS data, Sn improves the ruthenium catalysts' selectivity performance through an electronic effect.
AB - This work is focused on the investigation and chemical reduction improvement of sol-gel Ru-Sn/SiO2 catalysts. To clarify the reduction effect, the catalysts were characterized by a range of techniques [e.g., X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller analysis, pore size distribution, X-ray fluorescence, elementary analysis]. Liquid-phase hydrogenation of cinnamaldehyde (433 K, 70 bar, 2-propanol) was performed in order to evaluate the catalytic properties of synthesized materials. Conventional ruthenium- and sodium-modified catalysts yielded mainly saturated aldehyde, while reduced and nonreduced sol-gel catalysts afforded the formation of unsaturated alcohol with high selectivity. Chemical reduction was essential to increase the catalyst activity. A higher Sn/Ru ratio improved the selectivity to unsaturated alcohol in the cases of reduced and sodium-modified catalysts. Catalyst reduction is essential for the removal of chlorine and carbon residues. The novel coulometric method showed an increase of ruthenium surfaces in reduced catalysts. According to XPS data, Sn improves the ruthenium catalysts' selectivity performance through an electronic effect.
UR - http://www.scopus.com/inward/record.url?scp=0037243283&partnerID=8YFLogxK
U2 - 10.1021/ie020419t
DO - 10.1021/ie020419t
M3 - Article
AN - SCOPUS:0037243283
SN - 0888-5885
VL - 42
SP - 295
EP - 305
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 2
ER -