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TPAOH Template Removal from High-Silica ZSM-5 by Low-Temperature Hydrocracking
Zhao Shu-Heng1,2; Lang Lin1; Yin Xiu-Li1; Yang Wen-Shen1; Wu Chuang-Zhi1
2015-04-01
Source PublicationACTA PHYSICO-CHIMICA SINICA
Volume31Issue:4Pages:793-799
AbstractZeolite membranes, especially the MFI-type zeolite membranes, have attracted significant attention for decades because of their special properties. While organic templates such as tetrapropylammonium hydroxide (TPAOH) have typically been used for the synthesis of ZSM-5 zeolite and zeolite membranes, the templates remain trapped in the as-synthesized zeolite crystals. A common method for removing organic templates and generating porous frameworks is calcination; however, during this process, the channel structure may be affected. In particular, for ZSM-5 membranes, membrane defects may be produced and the separation efficiency therefore may decrease to some extent. In this study, the low-temperature hydrocracking of TPAOH in ZSM-5 zeolite crystals was studied under H-2/N-2, while N-2 adsorption, thermogravimetric (TG) analysis, Fourier transform infrared (FTIR) spectroscopy, temperature-programmed desorption of ammonia (NH3-TPD), and Raman spectroscopy were used to characterize zeolite samples. The results show that the organic template in the pores of ZSM-5 can be effectively removed below 350 degrees C by low-temperature hydrocracking. Characterization analyses by BET specific surface area, TG, FTIR, and Raman spectroscopy demonstrated that a reducing atmosphere containing H-2 was more conducive to template removal at low temperature than atmospheres of air or N-2. The degree of template removal increased with temperature increasing. The BET surface area of the crystal after hydrocracking at 280 degrees C reached 252 m(2).g(-1), although a small amount of organic residue remained. Furthermore, after hydrocracking at 350 degrees C, the BET surface area reached 399 m(2).g(-1), and only trace amount of inorganic carbon residue remained. In addition, the introduction of hydrogen at low temperatures could prevent coke deposits on acid sites and thus ZSM-5 zeolite crystals had greater numbers of acidic sites after low-temperature hydrocracking.
SubtypeArticle
KeywordZsm-5 Zeolite Template Removal Low-temperature Hydrocracking High Si/al Ratio Tetrapropylammonium Hydroxide
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.3866/PKU.WHXB201503021
WOS Subject ExtendedChemistry
WOS KeywordMFI ZEOLITE FILMS ; ORGANIC TEMPLATE ; SEPARATION PERFORMANCE ; UV/OZONE TREATMENT ; SECONDARY GROWTH ; THIN-FILMS ; MEMBRANES ; DEACTIVATION ; IMPROVEMENT ; OXIDATION
Indexed BySCI
Language英语
WOS SubjectChemistry, Physical
WOS IDWOS:000354153800024
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/9086
Collection中国科学院广州能源研究所
生物质能研究中心
生物质热化学转化实验室
Affiliation1.Chinese Acad Sci, Guangzhou Inst Energy Convers, CAS Key Lab Renewable Energy, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
First Author AffilicationGuangZhou Institute of Energy Conversion,Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhao Shu-Heng,Lang Lin,Yin Xiu-Li,et al. TPAOH Template Removal from High-Silica ZSM-5 by Low-Temperature Hydrocracking[J]. ACTA PHYSICO-CHIMICA SINICA,2015,31(4):793-799.
APA Zhao Shu-Heng,Lang Lin,Yin Xiu-Li,Yang Wen-Shen,&Wu Chuang-Zhi.(2015).TPAOH Template Removal from High-Silica ZSM-5 by Low-Temperature Hydrocracking.ACTA PHYSICO-CHIMICA SINICA,31(4),793-799.
MLA Zhao Shu-Heng,et al."TPAOH Template Removal from High-Silica ZSM-5 by Low-Temperature Hydrocracking".ACTA PHYSICO-CHIMICA SINICA 31.4(2015):793-799.
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