Correlation of the catalytic performance with Nb2O5 surface properties in the hydrodeoxygenation of lignin model compound
Correlation of the catalytic performance with Nb2O5 surface properties in the hydrodeoxygenation of lignin model compound
复制标题
木质素模型化合物加氢脱氧中催化性能与 Nb2O5 表面性质的相关性
DOI：
10.1016/j.jcat.2019.05.007
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发表时间：
2019
影响因子：
7.3
通讯作者：
Wang Yanqin
中科院分区：
文献类型：
--
作者：
Xin Yu;Dong Lin;Guo Yong;Liu Xiaohui;Hu Yongfeng;Wang Yanqin
通过木质素加氢脱氧（HDO）生产芳烃具有重要意义。以前，我们发现Ru/Nb 2 O 5是一个很好的催化剂，木质素转化为芳烃具有相对较高的选择性（71%）。在此，我们的目的是澄清Nb 2 O 5的性能影响的活性和选择性。采用四种不同形貌的Ru/Nb_2O_5催化剂对4-甲基苯酚进行了加氢脱硫反应。深入的研究表明，层状Nb 2 O 5负载的Ru具有更多的Nb双键O基团（不饱和NbOx位点）和最高的Ru分散度，这导致了最高的活性和甲苯选择性，这一点通过将预先合成的Ru胶体负载在各种Nb 2 O 5中得到进一步证实。最后，设计了一种含有更多不饱和Nb双键O基团的Ru/Nb 2 O 5催化剂，发现即使以酶解木质素为原料，芳烃选择性也可达94.8%，烃类收率为99.6%。该研究为木质素选择性合成芳烃的催化剂设计提供了一种新的思路。
Production of aromatic hydrocarbons through lignin hydrodeoxygenation (HDO) is of significant importance. Previously, we found that Ru/Nb2O5was an excellent catalyst for the conversion of lignin to arenes with relatively high selectivity (71%). Herein, we aim to clarify which properties of Nb2O5influence the activity and selectivity. Four Ru/Nb2O5catalysts with different Nb2O5morphologies were used in the HDO of 4-methylphenol. Intensive studies show that layered Nb2O5supported Ru has more Nbdouble bondO groups (unsaturated NbOx sites) and highest Ru dispersion, which led to the highest activity and toluene selectivity, this was further confirmed by loading pre-synthesized Ru colloids in various Nb2O5. Finally, a Ru/Nb2O5catalyst with more unsaturated Nbdouble bondO groups was designed and it was found that even with enzymatic lignin as the feedstock, the selectivity to arenes can reach up to 94.8% with the yield of hydrocarbons of 99.6%. This study provides a promising strategy for catalyst design towards the selective production of aromatic hydrocarbons from lignin.