Promoting effect of WOx on selective hydrogenolysis of glycerol to 1,3-propanediol over bifunctional Pt-WOx/Al2O3 catalysts
Promoting effect of WOx on selective hydrogenolysis of glycerol to 1,3-propanediol over bifunctional Pt-WOx/Al2O3 catalysts
复制标题
双功能Pt-WOx/Al2O3催化剂上WOx对甘油选择性氢解制1,3-丙二醇的促进作用
DOI：
10.1016/j.molcata.2014.12.021
复制
发表时间：
2015
影响因子：
--
通讯作者：
Li Yongwang
中科院分区：
文献类型：
--
作者：
Zhu Shanhui;Gao Xiaoqing;Zhu Yulei;Li Yongwang
尽管1,3-丙二醇具有很高的经济价值，但甘油氢解法生产1,3-丙二醇是一项具有挑战性的任务。本文制备了一系列wox2 - Pt/ al2o3催化剂，研究了不同wox2含量的Pt/ al2o3催化剂对甘油氢解选择性生产1,3-丙二醇的催化作用。为了探究催化剂的结构特征，采用BET、CO化学吸附、HRTEM、XRD （in - situXRD）、Raman、NH3-TPD、Py-IR、H2-TPR和XPS等手段对催化剂进行了表征。其中，Pt - 10wox / al2o3的1,3-丙二醇收率最高，达42.4%，这主要归功于Brønsted酸位浓度高，Pt与wox2之间的电子相互作用强以及氢溢出。1,3-丙二醇的产率与Brønsted酸位之间有很强的相关性，表明其在1,3-丙二醇的生成中起重要作用。同时，1,2-丙二醇产率与Lewis酸位点呈线性相关，直接证明了Lewis酸位点优先生成1,2-丙二醇。
Despite 1,3-propanediol possessing high economic value, its production from glycerol hydrogenolysis is a challenging task. Herein, a series of WOxpromoted Pt/Al2O3catalysts with various WOxcontents were prepared and investigated for selective production 1,3-propanediol from glycerol hydrogenolysis. To explore the structure feature, these catalysts were fully characterized by BET, CO chemisorption, HRTEM, XRD (in situXRD), Raman, NH3–TPD, Py–IR, H2–TPR, and XPS. Among them, Pt–10WOx/Al2O3achieved the highest 1,3-propanediol yield up to 42.4%, which was ascribed to the large concentration of Brønsted acid sites, strong electronic interaction between Pt with WOxand hydrogen spillover. The strong correlation between 1,3-propanediol yield and Brønsted acid site indicated its essential role for the formation of 1,3-propanediol. Meanwhile the linear correlation between 1,2-propanediol yield and Lewis acid site gave direct evidence that Lewis acid site preferentially generated 1,2-propanediol.