Acid-Alkaline Bi-functionalized Mesoporous Silica Nanocatalysts for Direct Cellulose-to-HMF Conversion
Date Issued
2011
Date
2011
Author(s)
Peng, Wun-Huei
Abstract
This study reports a one-pot strategy to produce 5-hydroxymethylfurfural (5-HMF, a very useful chemical for many polymers and fuel additives) with the presence of acid (SO3H), alkaline (NH2) and acid-alkaline (SO3H and NH2) bi-functionalized mesoporous silica nanoparticles with large pores (namely, LPMSN-SO3H, LPMSN-NH2 and LPMSN-NH2-SO3H, respectively) as heterogeneous solid catalysts. Due to the crisis of energy, developing an alternative energy such as biomass energy has become an important issue. To convert lignocellulosic biomass (e.g. cellulose, cellobiose and glucose etc.) into 5-HMF, there are three major steps: (1) depolymerization of polysaccharide (cellulose) into glucose with the presence of an acid catalyst; (2) isomerization of glucose into fructose with the presence of an alkaline catalyst; (3) dehydration of fructose into 5-HMF with the presence of an acid catalyst. The results for fructose-to-HMF conversion showed that the LPMSN-SO3H catalysts could promote the dehydration of fructose to 5-HMF with a high yield of 70.53%. For glucose-to-HMF conversion, the result indicated that both the LPMSN-NH2 and LPMSN-NH2-SO3H catalysts could efficiently enhance isomerization of glucose to 5-HMF with a high yield of 13.27 and 13.77%, respectively. For cellobiose-to-HMF conversion, the results pointed out that the LPMSN-SO3H catalysts could promote the hydrolysis of cellobiose and yield the maximum amount of 5-HMF (i.e., approximately 18.93%). For the cellulose-to-HMF conversion, the results indicated that both of the LPMSN-SO3H and LPMSN-NH2-SO3H catalysts exhibit the highest yield of overall products (cellobiose, glucose and 5-HMF) approximately 57%, where the LPMSN-SO3H catalysts could produce the highest yield of 5-HMF (i.e., 19.23%). We believe that the synthesized mesoporous solid catalysts are useful for one-pot production of 5-HMF from cellulose.
Subjects
mesoporous silica nanoparticles
acid-alkaline catalyst
ionic liquids
cellulose
5-hydroxymethylfurfural
Type
thesis
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