后合成碱处理和纳米镍粉改性对汽油提纯沸石催化剂性能的影响

IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY
 M. VELICHKINA L,  E. BARBASHIN YA
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引用次数: 0

摘要

用 NaOH 水溶液对 ZSM-5 沸石进行合成后处理,然后用纳米镍粉对处理后的沸石进行改性。通过干式机械搅拌将镍粉引入沸石中。研究了原始 ZSM-5 沸石和沸石基样品经碱性处理和改性后的质地、酸性和催化特性。研究了沸石在转化石油直馏汽油馏分过程中的催化活性。在确定目标反应产物(高辛烷值汽油)特性的同时,还对生成的气态碳氢化合物和碳压缩产物(焦炭)进行了分析。研究证实,对沸石进行碱性处理,然后将其与纳米镍粉混合,会导致总比表面积和总比孔隙体积减小,酸性位点浓度降低,其强度增加。研究确定了碱性处理和纳米镍粉改性对沸石催化剂质地和酸性的综合影响。研究表明,沸石催化剂的改性对转化石油直馏汽油馏分时形成的气体产品的成分几乎没有影响。对 ZSM-5 沸石进行合成后碱性处理可显著降低其芳香化和裂解活性,从而提高高辛烷值汽油的产量,并改善其环境特性。在碱处理过的沸石中引入纳米镍粉会增强这一趋势,但效果并不明显。在改性沸石上,碳压实产物的数量减少了,这将延长催化剂的稳定运行时间,并改善其再生条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
THE INFLUENCE OF POSTSYNTHETIC ALKALINE TREATMENT AND MODIFICATION WITH NICKEL NANOPOWDER ON THE PROPERTIES OF A ZEOLITE CATALYST FOR GASOLINE UPGRADING
Postsynthetic treatment of ZSM-5 zeolite with an aqueous solution of NaOH was carried out, followed by the modification of the treated zeolite with nanosized nickel powder. Nickel powder is introduced into the zeolite by dry mechanical mixing. The textural, acidic and catalytic properties of the original ZSM-5 zeolite and zeolite-based samples after alkaline treatment and modification are studied. The catalytic activity of zeolites has been studied in the process of conversion of straight-run gasoline fraction of oil. Along with determining the characteristics of the target reaction products - high-octane gasolines, an analysis of the resulting gaseous hydrocarbons and carbon compaction products (coke) was carried out. It has been established that alkaline treatment of zeolite and its subsequent mixing with nickel nanopowder leads to a decrease in the total specific surface area and total specific pore volume, a decrease in the concentration of acid sites and an increase in their strength. The enhancement of the combined effect of alkaline treatment and modification with nickel nanopowder on the textural and acidic properties of zeolite catalysts was determined. It has been shown that modification of zeolite catalysts has almost no effect on the composition of gaseous products formed in the conversion of straight-run gasoline fraction of oil. Post-synthetic alkaline treatment of ZSM-5 zeolite significantly reduces its aromatising and cracking activity, resulting in an increased yield of high-octane gasoline with improved environmental characteristics. The introduction of nickel nanopowder into alkali-treated zeolite enhances this trend, although not significantly. On modified zeolites, the amount of carbon compaction products is reduced, which will increase the time of stable operation of the resulting catalysts and improve the conditions for their regeneration.
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来源期刊
Chemistry for Sustainable Development
Chemistry for Sustainable Development CHEMISTRY, MULTIDISCIPLINARY-
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