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利用行星式球磨机并采用机械化学法制备了系列Ni-Al_2O_3催化剂,考察了球配比[大小质量比(1∶0、0∶1、1∶1)]、球磨时间(30、50、60、70、90 min)和球料比(1∶1、2∶1、3∶1)对Ni-Al_2O_3催化剂晶相结构、孔道结构、粒径分布和浆态床CO甲烷化性能的影响。XRD分析结果显示,具有NiCO_3·6H_2O物相的活性组分Ni前体焙烧后均转变成无定型NiO,高度分散在Al_2O_3载体中。BET和PSD分析表明,大球球磨制备的CT-10比表面积较大,近300 m~2/g;平均粒径较小,仅为240 nm。评价实验显示,全采用大球球磨制备的CT-10试样,CO转化率、CH_4选择性和CH_4收率均最高,分别为72.01%、49.08%和35.57%。经对球磨时间(60 min)和球、料质量比(2∶1)优化后,所得CT1-60-21试样的CH_4选择性和收率分别提高至87%和75%。
A series of Ni-Al 2 O 3 catalysts were prepared by planetary ball mill and mechanochemical method. The effects of ball ratio [size mass ratio (1: 0,0:1:1:1)], ball milling time (30,50,60, 70,90 min) and the ratio of material to material (1: 1, 2:1, 3:1) on the crystal structure, pore structure, particle size distribution and CO methanation of Ni-Al 2 O 3 catalyst. The results of XRD showed that Ni precursor with NiCO 3 · 6H 2 O phase transformed into amorphous NiO after calcination, which was highly dispersed in Al 2 O 3 support. The results of BET and PSD showed that the specific surface area of CT-10 prepared by ball milling was large, nearly 300 m 2 / g and the average particle size was only 240 nm. Evaluation experiments showed that the CT-10 samples prepared by ball milling all had the highest CO conversion, CH_4 selectivity and CH_4 yield, which were respectively 72.01%, 49.08% and 35.57%. After optimizing the ball milling time (60 min) and ball mass ratio (2:1), the obtained CH 4 selectivity and yield of CT1-60-21 increased to 87% and 75% respectively.