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Chemcial Industry and Engineering 2016, Vol. 33 Issue (3) :13-18,49    DOI: 10.13353/j.issn.1004.9533.20141011
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Conversion of Cellulose into Sorbitol over Nanosized γ-Al2O3 and Ru/CMK-3 Combination Catalyst
Zheng Dan, Han Jinyu, Wang Hua, Lv Jie
Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

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Abstract 

The effective one-pot conversion of cellulose to sorbitol is an important way to prepare high value-added chemicals from cellulose. The one-pot conversion of cellulose is affected by the acid hydrolysis and the hydrogenation of catalyst simultaneously. In this article, catalysts with the combination of various nanosized acid metallic oxides and Ru/CMK-3 were used in the hydrolytic hydrogenation of cellulose to sorbitol. The combination of nanosized γ-Al2O3 and Ru/CMK-3 catalyst showed a relatively higher conversion of cellulose and better sorbitol selectivity. A cellulose conversion of 49.8% and a sorbitol selectivity of 91.3% were obtained under the optimum conditions. The acid sites and the hydrogenation sites of various combination catalysts and the distribution characteristics of the reaction products were also discussed. The result shows that the match between the acid sites and the hydrogenation sites is crucial to obtain the high selectivity of sorbitol. When the acid function is too dominant, glucose formed by hydrolysis of cellulose can not be quickly hydrogenated. This free glucose will start to degrade into byproducts (5-HMF), which leads to the low selectivity of sorbitol.

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Zheng Dan
Han Jinyu
Wang Hua
Lv Jie
Keywordscellulose;   sorbitol;   acid sites;   hydrogenation sites;   nanosized acid metallic oxides     
Received 2014-05-10;
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Zheng Dan, Han Jinyu, Wang Hua, Lv Jie.Conversion of Cellulose into Sorbitol over Nanosized γ-Al2O3 and Ru/CMK-3 Combination Catalyst[J]  Chemcial Industry and Engineering, 2016,V33(3): 13-18,49
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