Highly durable Pt-supported niobia-silica aerogel catalysts in the aqueous-phase hydrodeoxygenation of 1-propanol
- Authors
- Ryu, Jihye; Kim, Sung Min; Choi, Jae-Wook; Ha, Jeong-Myeong; Ahn, Dong June; Suh, Dong Jin; Suh, Young-Woong
- Issue Date
- Dec-2012
- Publisher
- ELSEVIER
- Keywords
- 1-Propanol; Aqueous-phase processing; Hydrodeoxygenation; Aerogel; Pt/Nb2O5-SiO2
- Citation
- CATALYSIS COMMUNICATIONS, v.29, pp.40 - 47
- Indexed
- SCIE
SCOPUS
- Journal Title
- CATALYSIS COMMUNICATIONS
- Volume
- 29
- Start Page
- 40
- End Page
- 47
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/164081
- DOI
- 10.1016/j.catcom.2012.09.022
- ISSN
- 1566-7367
- Abstract
- The aqueous-phase hydrodeoxygenation (APHDO) of 1-propanol at 230 degrees 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 degrees 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.
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