Design Of New Solid Acid Synthesis And Catalytic Properties

Recently, the D-glucose, sucrose, cellulose and starch in the high-temperature and followed by sulfonation, preparation of amorphous carbon solid acid catalyst caused much attention. But carbonized and the sulfonated reaction time is long, and the degree of the carbonization and sulfonation are not easy to control and so on shortcomings. Thus, to explore a novel, simple, and strong acidity of the carbon-based solid acid catalyst acid synthesis, in practical applications is of great significance and broad prospects.In the paper, we use a kind of cheap starch, concentrated sulfuric acid as raw materials, controlled by the addition of ethanol, while carbonization and sulfonation were prepared by carbon-based solid acid catalyst. Using XRD, FT-IR, Raman, TG, elemental analysis of the catalyst structure, composition and properties were characterized. The results show that the step of carbonization at 150℃for 2 h obtained sulfonated catalysts with high surface area (350.0 m2 / g) and acid content. Tributyrin with methanol in the transesterification model reactions showed high catalytic activity, 98.03% conversion rate; 97.11% fatty acid methyl ester yield rate; 99.08% selectivity rate. The catalyst used for 3 times compared with fresh one, still remained high activity (up to 96.53%), so that the catalyst has high stability.In addition, two-step low-temperature study of starch synthesis of carbon-based solid acid acid method, by adding a small amount of concentrated sulfuric acid and the starch in the low temperature condensation occurs not completely carbonized, and then concentrated sulfuric acid sulfonation, equally successful get preparation of a different kind of carbon-based solid acid catalyst. The catalyzed butyrin and in the methyl alcohol ester exchange response, the butyrin conversion rate is 89.21%, the methyl-butyrate production rate is 78.72%, the selectivity is 88.29%. After three cycles, the catalyst still has high stability...