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采用过量浸渍法制备了Ni-Co/La2O3-γ-Al2O3双金属催化剂,并使用固定床石英反应器在850oC,0.1 MPa和空速为6000mL gcat1h 1的条件下考察了预处理对催化剂性能的影响.运用X射线衍射、热重-差示扫描量热、透射电子显微镜、扫描电镜和X射线能谱分析等手段对催化剂进行了表征.结果表明,与传统氢气还原预处理相比,经氢气和二氧化碳预处理后,催化剂性能明显提高,且能基本消除该催化剂上沼气重整反应的诱导期.511 h的稳定性实验结果表明,催化剂经氢气和二氧化碳预处理后具有很好的稳定性和抗积碳性,平均积碳速率仅为0.2 mg gcat1h 1.表征结果显示,经氢气和二氧化碳预处理后,催化剂具有更好的抗烧结和抗积碳性能,反应后金属颗粒较小,分布较均匀,粒径分布范围较窄,从而增强了催化剂的稳定性.
Ni-Co / La2O3-γ-Al2O3 bimetallic catalysts were prepared by over-impregnation method. The effects of pretreatment on the catalyst performance were investigated under the conditions of 850 ℃, 0.1 MPa and airspeed of 6000mL gcat1h 1 using a fixed bed quartz reactor The catalysts were characterized by X-ray diffraction, thermogravimetric-differential scanning calorimetry, transmission electron microscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy.The results showed that compared with the conventional hydrogen reduction pretreatment, After carbon dioxide pretreatment, the performance of the catalyst was obviously improved, and the induction period of the biogas reforming reaction on the catalyst was basically eliminated. The stability experiment at 511 h showed that the catalyst had good stability and resistance after hydrogen and carbon dioxide pretreatment The average carbon deposition rate is only 0.2 mg gcat1h 1. Characterization results show that the catalyst has better anti-sintering and anti-carbon deposition properties after hydrogen and carbon dioxide pretreatment. The metal particles are smaller and distributed more evenly , Narrow particle size distribution, thereby enhancing the stability of the catalyst.