钼基耐硫甲烷化催化剂放大制备

Scale-up production of Mo-based catalysts for sulfur-resistant methanation

采用共沉淀法对铈铝复合载体进行放大制备,考察制得的复合载体成型后负载Mo基催化剂的放大制备效应。结果表明,催化剂进行逐级放大制备过程中,CO转化率略降,放大效应不大。对催化剂进行表征发现,小试制备的载体酸强度略高于放大制备的载体酸强度,说明Al的不饱和配位键较多,更加有利于活性组分的负载和CO的吸附。另外,与小试制备催化剂相比,催化剂放大制备后,MoO_3颗粒尺寸略增,这是导致放大制备后催化剂催化反应活性略降的原因之一。

Cerium-aluminum composite carrier was enlarging synthesized by co-precipitation and used for Mo catalyst. Results showed that carbon monoxide conversion decreased slightly and the amplification effect was not significant. Acid strength of small scale sample was slightly higher than large scale sample according to characterization,which illustrates that Al unsaturated coordination bond is more in small scale smaple,more favorable for loading of active component and CO adsorption. In addition,compared with small scale catalyst,particle size of MoO3 in scale-up catalyst slightly increased. This resulted in reaction activity of catalyst decreasing slightly after amplification.