Cu/SiO_(2)复合材料体系的构建及其高效催化醇类脱氢性能研究

Rational design of Cu/SiO_(2) system for improving activity in dehydrogenation of alcohols

铜基催化剂对环己醇的非氧化脱氢具有较高的选择性,但转化率仍然不足,且铜基催化剂的稳定性因铜烧结而需要提高。通过湿化学法制备了Cu/SiO_(2)纳米颗粒,并对催化剂进行了XRD、SEM、TEM、FT-IR、BET、XPS和UV-Vis表征。结果表明,在280℃和WHSV为11.62 h^(-1)的条件下,该催化剂对环己醇脱氢制环己酮的选择性接近100%,摩尔转化率为81%。此外,该催化剂对苯甲醇脱氢制苯甲醛也有良好的性能,在260℃、WHSV为12.48 h^(-1)时,苯甲醇的摩尔转化率为75%,苯甲醛的收率为61%;该条件下,催化剂的活性在48 h内保持稳定。

Copper-based catalysts exhibit high selectivity for non-oxidative dehydrogenation of cyclohexanol,but deliver an insufficient conversion.Furthermore,the stability of copper-based catalysts needs to be improved due to copper sintering.Cu/SiO_(2) nanoparticles are prepared through wet chemical method,and characterized by means of XRD,SEM,TEM,FT-IR,BET,XPS and UV-Vis.It is shown that the selectivity of cyclohexanol dehydrogenation to cyclohexanone over the catalyst approaches 100%at 280℃and a WHSV of 11.62 h^(-1),and the molar conversion of cyclohexanol reaches 81%.In addition,the catalyst also has good performance for dehydrogenation of benzyl alcohol to benzaldehyde.At 260℃and a WHSV of 12.48 h^(-1),the molar conversion of benzyl alcohol reaches 75%,and the yield of benzaldehyde reaches 61%.Under these conditions,the activity of the catalyst remains stable within 48 h.