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每周分享：hydrothermally stable regenerable catalytic supports for aqueous-phase conversion of biomass

今天给大家分享的是2014年10月份 《catalysis today》上发表的一篇名为：hydrothermally stable regenerable catalytic supports for aqueous-phase conversion of biomass

文章摘要如下：

the hydrothermal stability of tio2- and zro2-based materials was studied by exposing the samples to liquid water at 523 k for 60 h in a batch reactor. no phase transformation or loss in bet surface area was observed for tio2-based materials that had initial bet surface area of less than 52 m2/g. in contrast, the bet surface area decreased and the primary crystallite size increased for all zro2-based materials tested. the bet surface area decreased and the primary crystallite size increased for high bet surface area tio2 (156 m2/g) and zro2 (246 m2/g). silica-containing tio2 only lost 30% of its high bet surface area (from 128 to 90 m2/g). in contrast a material composed of silica–phosphate–zro2 lost 56–72% of its bet surface area. using the crystalline tio2 as a support, we prepared and tested a pt–reox/tio2 catalyst for hydrodeoxygenation of sorbitol. pt–reox/tio2 was almost 2 times more active on a total pt basis than pt–reox/c catalyst. between 0.1 and 0.9 wt% of coke formed on the catalyst surface after reaction depending on the reaction conditions. the coke could be removed and the catalyst activity completely regenerated by an oxidation-reduction treatment. the catalyst showed only minimal change in bet surface area, tio2 phase and tio2 crystallite size after more than 163 h of time on stream. the co chemisorption of pt–reox/tio2 increased after reaction which was probably due to migration of reox species away from the pt during the reaction.

该文章中材料表征采用的是美国麦克仪器autochem 2920

详情可参考下面链接：

http://www.sciencedirect.com/science/article/pii/s092058611400220x