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山梨醇是纤维素催化加氢转化中重要的平台化合物之一。制备了固体酸磷酸氧钛TiOPO_4及磷酸氧钛负载钌Ru/TiOPO_4双功能催化剂,首先对磷酸氧钛催化纤维素水解反应进行研究,以葡萄糖收率为目标,考察了反应时间、氢压、温度的影响,得到了最适宜水解反应条件。在此基础上,以磷酸氧钛负载钌为催化剂,对其催化纤维素制山梨醇的催化性能进行研究,结果表明,水解加氢反应中,在反应温度(453 K)稍低于最适宜水解温度(463 K),反应时间(150 min)略短于最适宜水解时间(180 min)的反应条件下进行反应可得到更好的效果,最高山梨醇收率为77.6%,纤维素转化率99.3%。改变不同催化剂与底物之比,研究水解反应与水解加氢反应的转化率、产物分布,结果表明,双功能催化剂Ru/TPO可以使葡萄糖快速进行加氢反应,减少葡萄糖进一步降解的发生,液相中碳回收率显著提高,可达80%以上。
Sorbitol is one of the important platform compounds for cellulosic catalytic hydroconversion. Preparation of a solid acid titanyl phosphate TiOPO_4 and titanyl phosphate supported ruthenium Ru / TiOPO_4 bifunctional catalyst, first of all, the titanyl phosphate catalyzed cellulose hydrolysis reaction to glucose yield as the goal, investigated the reaction time, hydrogen pressure, temperature The optimum hydrolysis conditions were obtained. On the basis of this, the catalytic activity of sorbitol on cellulose catalyzed by ruthenium phosphate was studied. The results showed that the reaction temperature (453 K) was slightly lower than the optimal hydrolysis The best reaction was obtained under the reaction conditions of temperature (463 K), reaction time (150 min) slightly shorter than optimal hydrolysis time (180 min), the highest sorbitol yield was 77.6% and the cellulose conversion rate was 99.3 %. The results show that the bifunctional catalyst Ru / TPO can catalyze the hydrogenation of glucose rapidly and reduce the occurrence of further degradation of glucose. Phase carbon recovery was significantly improved, up to 80% or more.