超临界二氧化碳改性活性炭及其对载体性能的影响

以氯化钌为活性前驱体,活性炭为载体,采用超临界CO2处理制备钌/炭催化剂。以超临界二氧化碳流体对活性炭进行预处理,并使用联碱中和法、XPS等手段表征活性炭表面官能团数量,发现处理后活性炭表面羧基和酚羟基的数量明显减少,内酯基的数量增多,这是由于在超临界二氧化碳条件下活性炭表面的羧基和酚羟基发生酯化反应生成内酯基造成的。活性炭表面官能团的改变,改善了它的负载性能。结果表明,使用超临界CO2预处理活性炭作催化剂载体,能提高葡萄糖加氢制备山梨醇的反应催化活性。

Effect of supercritical CO2 treatment on the surface property of activated carbon and the function of activated carbon

Ru/C catalysts were prepared by supercritical CO2 treatment using RuCl3 as active precursor and activated carbon as support. Using supercritical carbon dioxide fluid to pretreatment activated carbon and use associated alkali neutralization method, XPS and other means to characterize the quantity of activated carbon surface functional groups, found that after treatment the activated carbon surface carboxyl and phenolic hydroxyl number was significantly reduced, increasing the number of lactone group, which since the activated carboxyl group and a phenolic hydroxyl surface groups lactone esterification under supercritical conditions of carbon dioxide caused. improve its load performance. The results show catalyst Change of surface functional groups of activated carbon to supercritical CO2 pre-treatment of activated carbon as support can increase the catalytic activity of Ru/C catalysts in glucose hydrogenation to sorbitol.