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以6%Mo-0.7%Co/HZSM-5催化剂为基础,分别添加第3金属活性组分Mg、Ni、Zn、Fe,采用共浸渍法制备一系列催化剂,并考察他们对甲烷无氧芳构化催化性能的影响。结果表明,在HZSM-5分子筛上浸渍得到的6%Mo-0.7%Co-0.1%Ni/HZSM-5催化剂与6%Mo-0.7%Co/HZSM-5相比甲烷的最大转化率从12%增加到13.9%,苯收率从6.58%增加到7.05%,同时还提高了催化剂的稳定性,使其失活速率由13.72%/h降低到12.73%/h。NH3-TPD等结果表明,6%Mo-0.7%Co/HZSM-5中添加第3活性组分Ni后,分子筛的酸强度及酸量得到优化,弱酸量与强酸量比例适中。TG的表征进一步说明了Ni物种调节了B酸位与Mo物种之前的相互作用,优化了催化剂的积碳行为。
Based on the 6% Mo-0.7% Co / HZSM-5 catalyst, the third metal active components Mg, Ni, Zn and Fe were respectively added and a series of catalysts were prepared by co-impregnation method. Influence of catalytic performance. The results showed that the maximum methane conversion of 6% Mo-0.7% Co-0.1% Ni / HZSM-5 catalyst impregnated on HZSM-5 zeolite was 12% To 13.9%. The benzene yield increased from 6.58% to 7.05%, and the stability of the catalyst was also improved. The rate of inactivation decreased from 13.72% / h to 12.73% / h. The results of NH3-TPD and other results show that after the third active component Ni is added to 6% Mo-0.7% Co / HZSM-5, the acid strength and acidity of the molecular sieve are optimized, and the ratios of weak acid to strong acid are moderate. The characterization of TG further illustrates that the Ni species regulates the interaction between the B acid sites and the Mo species and optimizes the carbon deposition behavior of the catalyst.