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Characterization and Catalytic Performance in n-Hexane Cracking of HEU-1 Zeolites Dealuminated Using Hydrochloric Acid and Hydrothermal Treatments
Liu Xiaoling1; Wang Yan1; Wang Xujin1; Zhang Yafei1; Gong Yanjun1; Xu Qinghu2; Xu Jun3; Deng Feng3; Dou Tao1
2012-12-01
Source PublicationCHINESE JOURNAL OF CATALYSIS
Volume33Issue:12Pages:1889-1900
SubtypeArticle
AbstractA series of modified HEU-1 zeolites were prepared using hydrochloric acid treatment, hydrothermal treatment, and a combination of these. The parent and modified HEU-1 zeolites were characterized by X-ray diffraction, N-2 adsorption-desorption isotherms, X-ray fluorescence, temperature-programmed desorption of ammonia, Fourier-transform infrared spectroscopy of adsorbed pyridine, and Al-27 solid-state magic-angle spinning nuclear magnetic resonance techniques. The catalytic cracking performances of the modified HEU-1 zeolites were evaluated on a fixed-bed microreactor at 625 degrees C, atmospheric pressure, and an n-hexane weight hourly space velocity of 2.0 h(-1). The results showed that extra-framework alumina could be removed by directly treating with hydrochloric acid, and framework alumina could be removed by hydrothermal treatment. Acidity characterization showed that the weak acid sites of HEU-1 zeolites could be adjusted using acid treatment, and the number of strong acid sites could be reduced using hydrothermal treatment. The framework n(Si):n(Al) ratio was improved by using a combination of hydrothermal treatment and acid leaching. The acidities of the HEU-1 zeolites were adjusted and both the mesopore volume and external surface area were enhanced. In n-hexane cracking reactions, the dealuminated HEU-1 zeolite obtained by hydrothermal treatment for 4 h at 600 degrees C and then washing with hydrochloric acid exhibited the highest propylene production as a result of suppression of the hydrogen transfer reaction. At 625 degrees C, the selectivity for propylene on HEU-1(HT4-HCl) increased to 35.2% from 21.9%, and the lifetime of HEU-1(HT4-HCl) was also prolonged from not more than 10 to 40 h.
KeywordHeu-1 Zeolite Dealumination Hydrothermal Treatment Hydrochloric Acid Treatment Catalytic Cracking Propylene
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1016/S1872-2067(11)60454-3
WOS KeywordHZSM-5 ZEOLITES ; LIGHT OLEFINS ; ACTIVE-SITES ; ZSM-5 ; TOPOLOGY ; H-ZSM-5 ; REALUMINATION ; TEMPERATURE ; MECHANISMS ; CONVERSION
Indexed BySCI
Language英语
WOS Research AreaChemistry ; Engineering
WOS SubjectChemistry, Applied ; Chemistry, Physical ; Engineering, Chemical
WOS IDWOS:000313139200004
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.apm.ac.cn/handle/112942/1584
Collection磁共振应用研究部
Affiliation1.China Univ Petr, CNPC Key Lab Catalysis, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China
2.China Natl Offshore Oil Corp New Energy Investmen, Beijing 100016, Peoples R China
3.Chinese Acad Sci, Wuhan Inst Phys & Math, Wuhan 430071, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Liu Xiaoling,Wang Yan,Wang Xujin,et al. Characterization and Catalytic Performance in n-Hexane Cracking of HEU-1 Zeolites Dealuminated Using Hydrochloric Acid and Hydrothermal Treatments[J]. CHINESE JOURNAL OF CATALYSIS,2012,33(12):1889-1900.
APA Liu Xiaoling.,Wang Yan.,Wang Xujin.,Zhang Yafei.,Gong Yanjun.,...&Dou Tao.(2012).Characterization and Catalytic Performance in n-Hexane Cracking of HEU-1 Zeolites Dealuminated Using Hydrochloric Acid and Hydrothermal Treatments.CHINESE JOURNAL OF CATALYSIS,33(12),1889-1900.
MLA Liu Xiaoling,et al."Characterization and Catalytic Performance in n-Hexane Cracking of HEU-1 Zeolites Dealuminated Using Hydrochloric Acid and Hydrothermal Treatments".CHINESE JOURNAL OF CATALYSIS 33.12(2012):1889-1900.
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