填充床中椰壳活性炭负载季铵盐催化CO2连续环加成

Coconut Shell Activated Carbon Supported Quaternary Ammonium Salt for Continuous Cycloaddition of CO2 in Packed Bed

摘要:

将一种季铵盐固定在椰壳活性炭（CSAC）颗粒上，得到负载型季铵盐催化剂，于填充床反应器中无溶剂条件下连续催化CO2与环氧氯丙烷（ECH）环加成反应。采用低温氮气吸附、红外光谱(FT-IR)、热重分析、X射线光电子能谱(XPS)测定了催化剂的结构、热性能。考察了压力、温度、反应时间对环加成反应性能的影响。结果表明，在ECH空速为14.1 h-1（WHSV），压力为1.4 MPa，温度为140 ℃时， ECH转化率为50.3%，氯丙烯碳酸酯(CPC)的选择性大于98%。

Abstract:

A kind of quaternary ammonium salt was immobilized onto the coconut shell activated carbon, which was exploited to catalyze continuous cycloaddition of CO2 to epichlorohydrin (ECH) in packed bed. The samples were characterized by N2 Adsorption-desorption, Fourier transform infrared spectroscopy (FT-IR), hermogravimetric analysis, and X-ray photoelectron spectroscopy (XPS). The effects of pressure, temperature and reaction time on the cycloaddition reaction were investigated. The catalyst showed a high selectivity of  over 98% to chloropropene carbonate(CPC) with a conversion of 50.3% in the packed bed as the WHSV of ECH was 14.1 h-1 at 140 °C and 1.4 MPa.