组合催化剂WO3+Raney Ni上高效转化菊芋秸秆制乙二醇

采用商业WO₃和Raney Ni为组合催化剂, 以菊芋秸秆为反应原料制备了乙二醇. 菊芋秸秆中含纤维素51.6 wt%、半纤维素10.3 wt%、木质素17.2 wt%、灰分1.7 wt%和水溶性物质19.2 wt%. 木质素对纤维素和半纤维素的转化影响较小, 而水溶性物质的存在抑制了乙二醇的生成, 因此由未经过预处理的菊芋秸秆得到的乙二醇收率只有29.9%. 而经简单的热水预处理可除掉其中的大部分水溶物, 因而乙二醇收率提高到37.6%. 此外, 组合催化剂在经过热水预处理的菊芋秸秆的转化中表现出了更好的循环使用性能. 同时考察了反应温度和时间对菊芋秸秆转化的影响.

Catalytic conversion of Jerusalem artichoke stalk to ethylene glycol over a combined catalyst of WO3 and Raney Ni

Jerusalem artichoke stalk (JAS) was employed as the feedstock for the production of ethylene glycol (EG) with a combined catalyst comprising commercial WO₃ and Raney Ni. The raw JAS contains 51.6 wt% cellulose, 10.3 wt% hemicellulose, 17.2 wt% lignin, 1.7 wt% ash, and 19.2 wt% water-soluble substances. It was found that the lignin component in the JAS had little effect on the conversion of hemicellulose while the water-soluble substances caused a negative effect, which led to an EG yield of only 29.9%. After a simple hot water pretreatment, most of the water-soluble substances were removed, and the EG yield was increased to 37.6%. Moreover, the hot water pretreatment also led to an improvement in the durability of the catalyst. The effects of reaction temperature and reaction duration were also investigated.