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与传统H2预处理方法相比,新型H2+CO2预处理方法(HCD)能显著提升Ni-Co双金属催化剂的沼气重整活性及抗积碳性能.考察了HCD预处理操作条件对催化剂性能与结构的影响.较好的HCD预处理操作条件是在催化剂经H2处理之后,再用175-200 mL·min-1的原料气CH4/CO2(比例为0:10)在780-800℃下还原0.5-1h.在优化预处理操作条件下对催化剂进行了511 h的耐久性考察,并运用X射线衍射(XRD)、热重-差示扫描量热(TG-DSC)、透射电子显微镜(TEM)等手段对耐久性测试后的催化剂进行了表征.在511 h的稳定性实验内,CH4、CO2转化率,H2、CO选择性及H2/CO体积比分别高达96%、97%,98%、99%及0.98.催化剂在测试期间的平均积碳速率仅为0.2 mg·g-1·h-1.在该预处理操作参数下,催化剂拥有最好的综合性能和良好的耐久性.
Compared with the traditional H2 pretreatment method, the new H2 + CO2 pretreatment method (HCD) can significantly improve the biogas reforming activity and anti-carbon deposition performance of the Ni-Co bimetallic catalyst. The effects of HCD pretreatment operating conditions on the performance of the catalyst and The preferred HCD pretreatment operating conditions were the reduction of the catalyst with H2 at a feed gas of 175-200 mL · min -1, CH4 / CO2 (0:10 ratio), at 780-800 ° C 0.5-1h. The catalyst was subjected to 511 hours of durability under optimized pretreatment conditions. The catalysts were characterized by X-ray diffraction (XRD), thermogravimetry-differential scanning calorimetry (TG-DSC) and transmission electron microscopy ) Were used to characterize the catalyst after the durability test.The CH4, CO2 conversion, H2, CO selectivity and H2 / CO volume ratio were as high as 96%, 97%, 98% , 99% and 0.98, respectively.The average carbon deposition rate of the catalyst during the test was only 0.2 mg · g-1 · h-1. Under the pretreatment operating parameters, the catalyst had the best overall performance and good durability.