石油与天然气化工2026，Vol.55Issue(2)：57-62,6.DOI:10.3969/j.issn.1007-3426.2026.02.007
Zn/HZSM-5正庚烷临氢异构化催化剂研究
Study on Zn/HZSM-5 catalyst for hydroisomerization isomerization of heptane
摘要
Abstract
Objective Isoparaffins are crucial clean blending components for enhancing the octane number of gasoline,but achieving optimal isomerization performance in the isomerization of n-heptane over HZSM-5 zeolite remains challenging.Therefore,it is necessary to introduce active metal Zn to modify HZSM-5 and study the effect of Zn loading on the intrinsic acidic structure of the catalyst,isomerization performance,and regulation of the octane number of the products.Method Zn-modified HZSM-5 bifunctional catalysts with metal-acid centers were prepared by the equal-volume impregnation method.Characterization and investigations were performed using X-ray diffraction,field emission scanning electron microscopy,infrared rheometry,and ammonia programmed temperature desorption.The influence of Zn loading on catalyst structure and n-heptane isomerization performance was investigated,while the product octane number was calculated using the group contribution method.Result The introduction of Zn improved the acidity and activity of HZSM-5,significantly enhancing the catalyst's isomerization performance.As the loading increased,the conversion rate and isomerization selectivity of n-heptane isomerization initially increased and then decreased.Conclusion When the loading was 6%(mass fraction the same below),the support acidity was optimal,promoting the reaction toward maximum isomerization degree.Exceeding 6%loading led to excessive metal coverage of active sites,hindering the reaction.The 6%Zn/ZSM-5 catalyst achieved a n-heptane isomerization conversion rate of 60.04%,an isomerization selectivity of 44.11%,and a product octane number of 44.24,representing a significant improvement over n-heptane(octane number of 0).When applied to naphtha isomerization,the catalyst increased the octane number from 60.70 to 71.20.关键词
HZSM-5分子筛/酸性调控/异构化/正庚烷/石脑油/辛烷值Key words
HZSM-5 molecular sieve/acidic regulation/isomerization/n-heptane/naphtha/octane number引用本文复制引用
傅文极,唐爽,邹昀廷,常金乐,刘娜,黄雪莉..Zn/HZSM-5正庚烷临氢异构化催化剂研究[J].石油与天然气化工,2026,55(2):57-62,6.基金项目
国家级大学生创新创业训练计划项目"煤基氢化油异构制备国Ⅵ汽油研究"(202310755033) （202310755033）
新疆维吾尔自治区重大科技专项项目"轻质氢化油提质生产国Ⅵ汽油技术开发与示范"(2021A01002) （2021A01002）
