Abstract
Catalytic effect of various metal sulfates as co-catalyst of extremely low sulfuric acid on glucose conversion in methanol medium was examined. The typical pathways included the alcoholysis of glucose into methyl glucoside and methyl levulinate, the formation of humin-type polymer from glucose or its degradation products, and the dehydration of methanol medium to dimethyl ether. The reaction selectivity is a clear function of the type of metal sulfates. Both K2SO4 and Na2SO4 can effectively suppress the further transformation of methyl glucoside from glucose, thus lower the polymer formation. For Fe2(SO4)3 and Al2(SO4)3, methyl levulinate was formed in the highest yields.
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