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随着塑料制品的大量使用，废弃聚乙烯的高效资源化转化已成为缓解“白色污染”和实现碳资源循环利用的重要途径.其中，加氢裂解技术能够在较温和条件下将聚乙烯转化为高附加值燃料和化学品.然而，如何构建兼具高金属活性与适宜酸性的双功能催化体系，以提高低碳烃选择性和产率，仍是当前研究的关键问题.为此，使用满孔浸渍法制备了不同的Pt/γ-Al_2O3催化剂，并构建了Pt/γ-Al_2O3和HY(30)分子筛的金属-酸双功能催化体系.采用X-射线衍射、扫描透射电子显微镜、氮气物理吸脱附等对催化剂进行表征，并探究了Pt基催化剂和分子筛类型、质量比、前处理方式对聚乙烯加氢裂解催化性能的影响.结果表明：0.5%Pt/γ-Al_2O3纤维催化剂和HY(30)分子筛质量比为1∶3时，反应性能最优，低碳烃类(C_(1-C16))总产率达到71.0%，这是Pt氢化位点和沸石酸性裂解位点之间协同作用的结果.
Abstract：With the extensive application of plastics, the efficient utilization of waste polyethylene has emerged as a pivotal strategy to address white pollution and advance carbon recycling. Hydrocracking represents a promising approach for transforming polyethylene into high-value fuels and chemicals under relatively mild conditions. Nevertheless, the development of bifunctional catalysts featuring well-balanced metal and acid functionalities remains a critical challenge in enhancing the yield of lowcarbon hydrocarbons. Herein, a series of Pt/γ-Al_2O3 catalysts were synthesized through incipient wetness impregnation and integrated with HY(30) zeolite to establish bifunctional metal-acid catalytic systems. The impacts of Pt catalyst variety, zeolite type, catalyst mass ratio, and pretreatment methodology on polyethylene hydrocracking were systematically examined. The findings demonstrated that the catalytic system, comprising 0.5% Pt/γ-Al_2O3 fibrous catalyst and HY(30) zeolite at a mass ratio of 1∶3, delivered optimal performance, yielding a total low-carbon hydrocarbon(C1-C16) output of 71.0%, as a result of the synergistic interaction between Pt hydrogenation sites and the zeolite's acidic cracking sites.
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基本信息:
DOI：10.20056/j.cnki.ZNMDZK.20260601
中图分类号:X705;TQ517.4;O643.36
引用信息:
[1]余静雅,张梅琦,张煜华,等.Pt/Al_2O_3-HY双功能催化体系用于废塑料加氢裂解制液体燃料[J].中南民族大学学报(自然科学版),2026,45(06):721-729.DOI:10.20056/j.cnki.ZNMDZK.20260601.
基金信息:
国家重点研发计划资助项目（2022YFB4101201）; 国家自然科学基金资助项目（22372199）; 国家民委中青年英才计划资助项目（MZR22001）
2026-08-11
2026-08-11
2026-08-11