In this study, two new types of heterogeneous catalysts named CF/g-C3N4-SO3H-PANI and CF/SO3H-PS were synthesized, and then their application to prepare a valuable organic substance called 5-hydroxymethylfurfural from fructose precursor was investigated. In the first study, CF/g-C3N4-SO3H-PANI catalyst was prepared and examined and identified by ATR-FTIR,FTIR-Pyridine, SEM, TGA, BET methods. The catalytic conversion reaction of fructose to HMF was performed in the aqueous solvent with different percentages of 1,4-dioxane. In this process, various factors such as temperature, time, pressure, different %w/w of g-C3N4 on the carbon fiber substrate, different percentages of water solvent and 1,4-dioxane, and the amount of catalyst to obtain the highest HMF efficiency were investigated. Finally, using CF/g-C3N4SO3H-PANI catalyst and fructose precursor, 69% HMF with a selectivity of 81.3 was obtained. In the second study, the CF/SO3H-PS catalyst was synthesized by various methods and was examined and identified by FT-IR and SEM methods. Then its application for HMF production from fructose in DMSO solvent was eva‎luated. In this process, various factors such as time, temperature, and type of catalyst synthesis method were studied to obtain more HMF. Finally, using CF/SO3H-PS catalyst catalyst and fructose precursor, 78.5% HMF was obtained. Catalyst reusability was also eva‎luated and a decrease in efficiency was observed after reuse. To improve the reusability process, the CF/SO3H-PS catalyst was modified using TiO2 an divinylbenzene crosslinker.

مهران غياثي

عليرضا نجفي چرمهيني، محمد ديناري