SnCl_2-ZnCl_2/C无汞乙炔氢氯化催化剂的制备与优化

Preparation and Optimization of SnCl_2-ZnCl_2/ C Mercury-free Catalyst for Acetylene Hydrochlorination

利用超声波制备了SnCl2-ZnCl2/C无汞乙炔氢氯化催化剂,同时加入稀土化合物以稳定催化剂的性能。通过黄金分割法与抛物线法确定了活性组分SnCl2与ZnCl2的最优质量比为2∶1。优选制备工艺,发现在反应温度140℃,乙炔空速300 h-1,V(HCl)/V(C2H2)=1.10时,由0.67 g SnCl2、0.33 g ZnCl2、0.05 g Tb4O7以及4 g焙烧过的活性炭组成的催化剂,其乙炔平均转化率最高,为67.70%。实验表明,载体的处理方式是影响催化剂性能的重要因素。

Mercury-free catalyst SnCl2-ZnCl2/C for acetylene hydrochlorination was prepared by ultrasound method. Rare earth compounds were added to stabilize the performance of the catalyst. The optimal mass ratio of the active component SnCl2 and ZnCl2 is 2： 1, which was determined by golden section and parabolic method. At 140 ℃, acetylene space velocity 300 h-1, V（ HCl）/V（ C2 H2） = 1.10, in the presence of a catalyst composed by 0. 67 g SnCl2, 0. 33 g ZnCl2, 0. 05 g Tb4 07, and 4 g calcined activated carbon （AC） supporter, the supporter was highest 67.70% acetylene average conversion rate found to be the most important effect factor of the was achieved. The preparation method of the catalyst performance.