Bi@H_2O_2预处理活性炭催化剂及其对乙炔氢氯化催化活性

Bi@H_2O_2 pretreatment activated carbon catalyst and its activity for acetylene hydrochlorination

用过氧化氢对椰壳活性炭载体进行预处理,以氯化铋溶液为前驱体,等体积浸渍法制备了Bi@H_2O_2预处理活性炭催化剂,将其用于乙炔氢氯化反应,考察其催化活性。考察了不同浓度过氧化氢对催化剂乙炔氢氯化反应活性的影响。结果表明,与未处理的催化剂相比,处理后催化剂活性有所提高。浓度为15%过氧化氢预处理后催化剂活性提高了37%左右,效果较佳。傅里叶-红外(FT-IR)、元素分析(EDS)、氮气物理吸附脱附(BET)、X射线衍射(XRD)和程序升温还原(TPR)、热重(TG)等表征说明:过氧化氢预处理增加了活性炭载体表面的含氧基团,改变了活性炭载体的孔结构,适当的过氧化氢浓度预处理增大了载体比表面积和孔容,因此促进了活性组分吸附,改善了活性组分与载体间的相互作用,促进了活性组分在载体表面的分散与结晶,提高催化活性。

Coconut shell activated carbon was pretreated by H2O2. Bi@ H2O2 pretreatment activated carbon catalyst, with bismuth chloride（ BiCl3） solution as the precursor, was prepared by impregnation method and its catalytic activity for the acetylene hydro-chlorination at different concentration of H202 were investigated. Results showed that the activity is enhanced comparing that of un-pretreatment catalyst. And the highest activity was performed by 15% H202 , about 37% higher than unpretreatment catalyst. Charac-terizations of fourier infrared（ FT-IR） ,element analysis（ EDS） , N2 physical adsorption/desorption（ BET） ,X-ray diffraction（ XRD）, temperature programmed reduction（ TPR） and thermo gravimetric（ TG） indicate that the oxygen containing groups can be increased on the activated carbon surface,the texture structure of activated carbon changed. The biggest specific surface area and pore volume of the active carbon were obtained when appropriate concentration of H2O2. Therefore adsorption, dispersion, crystallization of active component, and interaction between it and the carrier were improved. So the catalytic activity was enhanced.