Investigation of the WO3/ZrO2 surface acidic properties for the aqueous hydrolysis of cellobiose
Investigation of the WO3/ZrO2 surface acidic properties for the aqueous hydrolysis of cellobiose
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DOI：
10.1016/j.catcom.2011.12.030
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发表时间：
2012-03-01
影响因子：
3.7
通讯作者：
Auroux, A.
中科院分区：
文献类型：
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作者：
Kourieh, R.;Bennici, S.;Auroux, A.
通过共沉淀制备了一系列具有不同氧化钨负载量 (1-20) wt.% 的 WOx/ZrO2。采用XRD、BET、XPS、拉曼光谱、TPR、氨吸附微量热法和吡啶FT-IR光谱对催化剂进行了表征。 XRD 和拉曼结果表明，当 WO3 负载量低于 5 wt.% 时，ZrO2 载体主要以单斜相存在，而当 WO3 负载量高于 10 wt.% 时，ZrO2 载体主要以四方相存在。对于在700℃下煅烧的催化剂，没有检测到块状WO 3 的形成，对于最高负载的样品也是如此。 TPR 结果表明，分离的 WO3 物质比无定形 WOx 更容易还原。氨吸附微量热研究证明了酸性位点的吸附热在 90 范围内
A series of WOx/ZrO2 with various tungsten oxide loadings (1-20) wt.% was prepared by co-precipitation. The catalysts were characterized by XRD, BET, XPS, Raman spectroscopy, TPR, ammonia adsorption microcalorimetry and pyridine FT-IR spectroscopy. XRD and Raman results showed that the ZrO2 support is predominantly present in the monoclinic phase when the WO3 loading was less than 5 wt.% and predominantly in the tetragonal phase above 10 wt.%. No formation of bulk WO3 was detected for the catalysts calcined at 700 C. which is also the case for the highest loaded samples. TPR results revealed that isolated WO3 species are easier to reduce than amorphous WOx. The ammonia adsorption microcalorimetric study evidenced acid sites with adsorption heats in the range 90