Highly durable Pt-supported niobia-silica aerogel catalysts in the aqueous-phase hydrodeoxygenation of 1-propanol

Title
Highly durable Pt-supported niobia-silica aerogel catalysts in the aqueous-phase hydrodeoxygenation of 1-propanol
Authors
류지혜김성민최재욱하정명안동준서동진서영웅
Keywords
1-Propanol; Aqueous-phase processing; Hydrodeoxygenation; Aerogel; Pt catalyst; Pt/Nb2O5-SiO2
Issue Date
2012-12
Publisher
Catalysis communications
Citation
VOL 29, 40-47
Abstract
The aqueous-phase hydrodeoxygenation (APHDO) of 1-propanol at 230 °C and 35 bar was studied over 1 wt.% Pt catalysts supported on several metal oxides. Pt catalysts supported on amorphous silica, alumina and niobia aerogels, and crystalline niobic acid calcined at 500 °C showed low activities or deactivation. Under the APHDO condition, these supports experienced a structure transformation to crystalline quartz, boehmite and niobia TT phase. Pt/Nb2O5–Al2O3 aerogel also suffered from the same crystallization behavior. In contrast, Pt/Nb2O5–SiO2 aerogels with different Nb/(Nb+Si) ratios maintained a good catalytic performance for prolonged reaction periods. Through characterizations of spent catalysts, Nb2O5–SiO2 aerogels were found to retain X-ray amorphous and porous structure. Also, their acid site densities were negligibly changed during the reaction. The catalysts with the Nb/(Nb+Si) ratio of 0.500 and 0.575 reached the molar propane/ethane ratio of about 1.0, indicating that Pt/Nb2O5–SiO2 aerogel catalysts are highly active in the presence of water.
URI
http://pubs.kist.re.kr/handle/201004/43339
ISSN
15667367
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KIST Publication > Article
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