Production of hexane from sorbitol in aqueous medium over Pt/NbOPO4 catalyst
Production of hexane from sorbitol in aqueous medium over Pt/NbOPO4 catalyst
复制标题
Pt/NbOPO4 催化剂在水介质中山梨醇生产己烷
DOI：
10.1016/j.apcatb.2015.08.052
复制
发表时间：
2016-02
影响因子：
22.1
通讯作者：
Wang, Yanqin
中科院分区：
文献类型：
--
作者：
Yang, Panpan;Liu, Xiaohui;Lu, Guanzhong;Wang, Yanqin
来自可再生生物质的液体生物燃料对于替代日益减少的化石燃料具有重要意义。水相法可以利用糖和糖衍生分子生产一系列烷烃和含氧化合物。本文将Pt/NbOPO 4多功能催化剂用于山梨醇水溶液加氢脱氧制烷烃反应中。结果表明，Pt/NbOPO 4催化剂在250 °C、4 MPa H2条件下具有最高的活性，C6和C5烷烃收率达60%。反应历程表明，该过程包括脱水、氢解和CC键断裂。异山梨醇是脱水反应的产物，也是脱水过程中的重要中间体，它经过开环和氢解生成C6己烷。在Pt/NbOPO 4催化剂上，山梨醇脱水和异山梨醇氢解的活化能分别为72.7 kJ/mol和147.6 kJ/mol，远低于Pt/ZrP和Pt/H-Beta催化剂，这可能是由于NbOPO 4的强酸性和高酸量以及NbOx对CO键断裂的促进作用。上述结果还表明异山梨醇氢解是反应的速率控制步骤。Pt/NbOPO 4催化剂稳定性好，在固定床反应器中反应100 h后，山梨醇转化率几乎没有下降，产物分布也没有变化。因此，Pt/NbOPO 4是一种高效、稳定的山梨醇水相转化制己烷催化剂。
Liquid bio-fuels derived from renewable biomass are of great importance on the potential substitution for the diminishing fossil fuels. Aqueous-phase process of sugar and sugar-derived molecules can be used to produce a range of alkanes and oxygenates. In this work, Pt/NbOPO4multifunctional catalyst was used in the alkane production by the hydrodeoxygenation of sorbitol in aqueous solution. The results indicated that Pt/NbOPO4catalyst showed the highest activity with 60% yield of C6 and C5 alkanes at 250 °C and 4 MPa H2among a series of catalysts. The reaction pathway showed that this process included dehydration, hydrogenolysis and CC bond cleavage. Isosorbide is the product of dehydration reaction and also an important intermediate in this process, which undergoes ring opening and following hydrogenolysis to form C6 hexane. The activation energy of sorbitol dehydration and isosorbide hydrogenolysis was calculated, that is 72.7 kJ/mol and 147.6 kJ/mol, respectively, over Pt/NbOPO4catalyst, much lower than those over Pt/ZrP and Pt/H-Beta catalysts, which would be attributed to the strong and high acid amount of NbOPO4as well as the promotion effect of NbOxfor CO bond cleavage. The above results also showed that isosorbide hydrogenolysis is the rate-determine step. More importantly, Pt/NbOPO4catalyst was very stable, there was nearly no decrease of sorbitol conversion and no change of products distribution after working in a fixed bed reactor for 100 h. Therefore, Pt/NbOPO4is an efficient and stable catalyst for hexane production from sorbitol in aqueous media.
登录
查看更多内容
影响因子：
9.8
作者：
T. Vispute;G. Huber
通讯作者：
T. Vispute;G. Huber
影响因子：
32.5
作者：
Langan, Paul;Gnanakaran, S.;Hammel, Kenneth E.
通讯作者：
Hammel, Kenneth E.
DOI：
10.1002/chin.201219272
发表时间：
2012-05
期刊：
ChemInform
影响因子：
--
作者：
P. Gallezot
通讯作者：
P. Gallezot
影响因子：
16.6
作者：
Zhao, Chen;Kou, Yuan;Lercher, Johannes A.
通讯作者：
Lercher, Johannes A.
新型碳基固体酸高效催化果糖转化为羟甲基糠醛
影响因子：
9.8
作者：
Wang, Jianjian;Xu, Wenjie;Wang, Yanqin
通讯作者：
Wang, Yanqin