每周分享９�/span>Hydrothermally stable regenerable catalytic supports for aqueous-phase conversion of biomass

今天给大家分享的�?/span>2014平�/span>10月份〉�/span>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９�/span>

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�?2% 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