TY - JOUR
T1 - Preparation of H3PMo12O40 catalyst immobilized on surface modified mesostructured cellular foam (SM-MCF) silica and its application to the ethanol conversion reaction
AU - Kim, Heesoo
AU - Jung, Ji Chul
AU - Kim, Pil
AU - Yeom, Sung Ho
AU - Lee, Kwan Young
AU - Song, In Kyu
N1 - Funding Information:
The authors acknowledge the support from Korea Science and Engineering Foundation (KOSEF R01-2004-000-10502-0).
PY - 2006/11/15
Y1 - 2006/11/15
N2 - Surface of mesostructured cellular foam (MCF) silica was modified by grafting 3-aminopropyl-triethoxysilane (APTES) to have the positive charge, and thus, to provide sites for the immobilization of H3PMo12O40. By taking advantage of the overall negative charge of [PMo12O40]3-, H3PMo12O40 catalyst was chemically immobilized on the aminopropyl group of surface modified MCF (SM-MCF) silica as a charge matching component. It was revealed that H3PMo12O40 species were finely and molecularly dispersed on the SM-MCF silica via chemical immobilization. In the vapor-phase ethanol conversion reaction, the H3PMo12O40/SM-MCF silica catalyst showed a higher ethanol conversion than the bulk H3PMo12O40 catalyst. Furthermore, the H3PMo12O40/SM-MCF silica catalyst exhibited an enhanced oxidation catalytic activity (formation of acetaldehyde) and a suppressed acid catalytic activity (formation of ethylene and diethylether) compared to the mother catalyst. The enhanced ethanol conversion and oxidation catalytic activity of H3PMo12O40/SM-MCF silica catalyst was attributed to fine dispersion of H3PMo12O40 species on the SM-MCF silica via chemical immobilization.
AB - Surface of mesostructured cellular foam (MCF) silica was modified by grafting 3-aminopropyl-triethoxysilane (APTES) to have the positive charge, and thus, to provide sites for the immobilization of H3PMo12O40. By taking advantage of the overall negative charge of [PMo12O40]3-, H3PMo12O40 catalyst was chemically immobilized on the aminopropyl group of surface modified MCF (SM-MCF) silica as a charge matching component. It was revealed that H3PMo12O40 species were finely and molecularly dispersed on the SM-MCF silica via chemical immobilization. In the vapor-phase ethanol conversion reaction, the H3PMo12O40/SM-MCF silica catalyst showed a higher ethanol conversion than the bulk H3PMo12O40 catalyst. Furthermore, the H3PMo12O40/SM-MCF silica catalyst exhibited an enhanced oxidation catalytic activity (formation of acetaldehyde) and a suppressed acid catalytic activity (formation of ethylene and diethylether) compared to the mother catalyst. The enhanced ethanol conversion and oxidation catalytic activity of H3PMo12O40/SM-MCF silica catalyst was attributed to fine dispersion of H3PMo12O40 species on the SM-MCF silica via chemical immobilization.
KW - 3-Aminopropyl-triethoxysilane (APTES)
KW - Grafting
KW - Heteropolyacid catalyst
KW - Immobilization
KW - Mesostructured cellular foam silica
KW - Vapor-phase ethanol conversion reaction
UR - http://www.scopus.com/inward/record.url?scp=33749998294&partnerID=8YFLogxK
U2 - 10.1016/j.molcata.2006.06.032
DO - 10.1016/j.molcata.2006.06.032
M3 - Article
AN - SCOPUS:33749998294
VL - 259
SP - 150
EP - 155
JO - Journal of Molecular Catalysis A: Chemical
JF - Journal of Molecular Catalysis A: Chemical
SN - 1381-1169
IS - 1-2
ER -