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采用过量浸渍法将沼气重整制氢Ni-Co/La2O3-γ-Al2O3球形催化剂的制备规模分别放大20倍和40倍进行工艺研究,以考察放大效应。以CH4/CO2体积比为1的混合气模拟沼气,考察制备规模对催化剂沼气重整反应性能的影响。采用能量色散X射线荧光光谱仪(EDX)、透射电镜(TEM)、热重-差示扫描量热(TG-DSC)等手段对催化剂进行表征。结果表明,随着制备规模的加大,催化剂的重整活性虽然在前期明显下降,但随着反应的进行会迅速回升。反应9h后,制备规模为100和200g的催化剂的甲烷转化率与制备规模为5g的催化剂相比仅下降约5%;二氧化碳转化率下降不明显;反应后催化剂的表面积炭有所增加,但增加的趋势随制备规模加大趋于平缓;反应前和反应后金属颗粒粒径也有所增大,但未发现明显的团聚和烧结,增大的趋势也随制备规模加大趋于平缓。由此可见采用过量浸渍法放大制备本催化剂基本可行。
The preparation scale of Ni-Co / La2O3-γ-Al2O3 spherical catalyst for biogas reforming was enlarged by 20 times and 40 times, respectively, by means of excessive impregnation to study the amplification effect. The biogas was simulated with a mixed gas with a CH4 / CO2 volume ratio of 1 to investigate the effect of preparation scale on the biogas reforming reaction performance of the catalyst. The catalysts were characterized by EDX, TEM and TG-DSC. The results showed that with the increase of preparation scale, although the reforming activity of the catalyst decreased obviously in the early period, the reactivity of the catalyst rebounded rapidly as the reaction proceeded. After 9 hours of reaction, the methane conversion of the catalysts with the preparation scale of 100 and 200g decreased by only about 5% compared with that of the catalyst with the preparation scale of 5g; the decrease of the carbon dioxide conversion was not obvious; the surface carbon deposition of the catalyst increased but increased Tends to be gentle with the preparation scale. Before and after the reaction, the particle size of the metal particles also increases, but no obvious agglomeration and sintering are found. The trend of increase tends to be gentle with the preparation scale. This shows that the use of excessive impregnation method to prepare the catalyst is basically feasible.