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Realumination of dealuminated HZSM-5 zeolites by acid treatment, the impact of Al-F distribution and its catalytic cracking performance of alkanes

摘要:Realumination of dealuminated HZSM-5 zeolites by acid treatment has always been controversial and puzzling. Through characterizations of XRD, nitrogen adsorption, NH3-TPD, IR, XPS and 27Al MAS NMR, this work confirmed realumination of dealuminated HZSM-5 zeolites could indeed be achieved after treated with HCl solution. And it was found mainly a portion of the penta-coordinated extra-framework aluminia (EFAl) were reinserted into the framework during the process of realumination. Moreover, the characterizations of ICP-AES and UV-Vis-DRS of Co2+-exchanged zeolites indicated the realumination capacity was closely related to the distribution of framework Al (AlF). Realumination was more likely achieved when there was lower content of Al pairs and less AlF located in the channel intersections in HZSM-5. Finally, realuminated zeolites exhibited a higher conversion of n-octane due to its more Bronsted acid sites than dealuminated HZSM-5 in catalytic cracking reaction. The significantly lower content of Al pairs in realuminated zeolites compared to parent HZSM-5 inhibits the hydride transfer process to a certain extent, resulting in a higher selectivity of propylene.

关键字:ZSM-5 zeolite; Realumination; Al distribution; Propylene; Catalytic cracking

ISSN号:1387-1811

卷、期、页:卷: 338

发表日期:2022-06-01

影响因子:5.454500

期刊分区(SCI为中科院分区):二区

收录情况:SCIE(科学引文索引网络版)

发表期刊名称:MICROPOROUS AND MESOPOROUS MATERIALS

参与作者:赵红娟,刘宏海,高雄厚

通讯作者:陈康,赵吉雨,黎安慧,李国省,张强,夏添

第一作者:朱小春,徐春明,申宝剑

论文类型:期刊论文

论文概要:陈康,赵吉雨,黎安慧,李国省,张强,夏添,赵红娟,朱小春,刘宏海,高雄厚,徐春明,申宝剑,Realumination of dealuminated HZSM-5 zeolites by acid treatment, the impact of Al-F distribution and its catalytic cracking performance of alkanes,MICROPOROUS AND MESOPOROUS MATERIALS,2022,卷: 338

论文题目:Realumination of dealuminated HZSM-5 zeolites by acid treatment, the impact of Al-F distribution and its catalytic cracking performance of alkanes

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