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以HZSM-5分子筛为基础,通过过量浸渍法制备P元素与过渡金属元素(Cu、Zn、Ni)复合负载改性M-P/HZSM-5分子筛催化剂。使用XRD、N_2吸附-脱附和吡啶红外对分子筛催化剂进行表征,并考察其催化松木和低密度聚乙烯共热解反应的活性。结果表明:改性后的HZSM-5催化剂保持MFI骨架结构,但微孔体积减小,总Br?nsted酸(B酸)酸量降低,并且Br?nsted酸、Lewis酸(L酸)的分布发生改变。与未改性HZSM-5分子筛相比,改性分子筛可提高高附加值石油化学品的收率,同时可减少积碳。其中,经H_2还原的Ni-P/HZSM-5催化剂的脱氧能力和芳构化性能提升最显著,CO和单环芳烃的碳收率分别从6.48%、25.7%提高到11.1%、34.0%。
Based on the HZSM-5 molecular sieve, the M-P / HZSM-5 molecular sieve catalyst with P element and transition metal elements (Cu, Zn, Ni) was prepared by over impregnation method. The molecular sieve catalysts were characterized by XRD, N 2 adsorption-desorption and pyridine-based infrared spectroscopy. The catalytic activity of the catalysts for catalyzing the co-pyrolysis of pine and low-density polyethylene was also investigated. The results show that the modified HZSM-5 catalyst retains the framework structure of MFI, but the micropore volume decreases, the total Br? Nsted acid (B) acid content decreases, and Br? Nsted acid, Lewis acid changes happened. Compared with the unmodified HZSM-5 zeolite, the modified molecular sieve can improve the yield of high value-added petrochemicals, while reducing carbon deposition. Among them, the deoxidation ability and aromatization performance of Ni-P / HZSM-5 catalyst reduced by H_2 were the most significant. The carbon yield of CO and monocyclic aromatic hydrocarbon increased from 6.48% and 25.7% to 11.1% and 34.0% respectively.