TY - JOUR
T1 - Hybrid TiO2-SiO2 organic/inorganic gels as catalysts for olefin epoxidation
AU - Buechler-Skoda, Melissa
AU - Gill, Rajinder
AU - Vu, David
AU - Nguyen, Chau
AU - Larsen, Gustavo
PY - 1999/9/20
Y1 - 1999/9/20
N2 - Hybrid TiO2-SiO2 xerogels were treated at different temperatures, and used as olefin epoxidation catalysts. All samples displayed a very high selectivity toward formation of cyclooctene oxide from cis-cyclooctene, in the presence of hydrogen peroxide and methanol. 'All-inorganic' (entirely TEOS-based) preparations are more subject to Ti leaching during reaction than the hybrid materials and as a consequence, they display much poorer activity recovery after recovery and re-use. The higher hydrophobicity of the hybrid samples relative to that of the conventional TiO2-SiO2 alcogel is demonstrated by dynamic adsorption experiments using an oscillating balance reactor.
AB - Hybrid TiO2-SiO2 xerogels were treated at different temperatures, and used as olefin epoxidation catalysts. All samples displayed a very high selectivity toward formation of cyclooctene oxide from cis-cyclooctene, in the presence of hydrogen peroxide and methanol. 'All-inorganic' (entirely TEOS-based) preparations are more subject to Ti leaching during reaction than the hybrid materials and as a consequence, they display much poorer activity recovery after recovery and re-use. The higher hydrophobicity of the hybrid samples relative to that of the conventional TiO2-SiO2 alcogel is demonstrated by dynamic adsorption experiments using an oscillating balance reactor.
KW - Adsorption
KW - Hybrid gels
KW - Olefin epoxidation
UR - http://www.scopus.com/inward/record.url?scp=0033588777&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033588777&partnerID=8YFLogxK
U2 - 10.1016/S0926-860X(99)00188-X
DO - 10.1016/S0926-860X(99)00188-X
M3 - Article
AN - SCOPUS:0033588777
VL - 185
SP - 301
EP - 310
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
SN - 0926-860X
IS - 2
ER -