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A fast route for synthesizing nano-sized ZSM-5 aggregates
Alternative TitleJ. Mater. Chem. A
Pan, Feng1; Lu, Xuchen1,3; Zhu, Qingshan1; Zhang, Zhimin1; Yan, Yan1; Wang, Tizhuang1; Chen, Shiwei1,2
2014
Source PublicationJOURNAL OF MATERIALS CHEMISTRY A
ISSN2050-7488
Volume2Issue:48Pages:20667-20675
AbstractNano-sized ZSM-5 aggregates have been rapidly synthesized from leached metakaolin by solid-like state conversion. The influence of synthesis conditions such as TPA(+)/SiO2, NaOH/SiO2 and SiO2/Al2O3 molar ratios on the final products was investigated. The properties of nano-sized ZSM-5 aggregates were characterized by XRD, SEM, HRTEM, Si-29 and Al-27 MAS NMR, NH3-TPD, TG, N-2 adsorption-desorption and particle size analysis. The results clearly showed that nano-sized ZSM-5 aggregates could be obtained within 2 h via solid-like state conversion. SEM revealed that the obtained ZSM-5 aggregates were irregular spheres that consisted of nano-sized crystallites with 30-50 nm. The crystallization process indicated that the size of flaky raw materials gradually decreased and formed nano-sized particles as time prolonged. Therefore, the transformation mechanism followed the solution mediated mechanism, though only a little water was contained in the system. Compared with the conventional hydrothermal route, the solid-like state conversion not only significantly shortened the crystallization time, but also totally avoided the emission of waste liquids. In addition, for the methanol dehydration reaction, the nano-sized ZSM-5 aggregates obtained by this method showed much better catalytic performance, C2-C4 olefin selectivity and longer lifetime to endure coke deposition than the sample obtained by the hydrothermal route.; Nano-sized ZSM-5 aggregates have been rapidly synthesized from leached metakaolin by solid-like state conversion. The influence of synthesis conditions such as TPA(+)/SiO2, NaOH/SiO2 and SiO2/Al2O3 molar ratios on the final products was investigated. The properties of nano-sized ZSM-5 aggregates were characterized by XRD, SEM, HRTEM, Si-29 and Al-27 MAS NMR, NH3-TPD, TG, N-2 adsorption-desorption and particle size analysis. The results clearly showed that nano-sized ZSM-5 aggregates could be obtained within 2 h via solid-like state conversion. SEM revealed that the obtained ZSM-5 aggregates were irregular spheres that consisted of nano-sized crystallites with 30-50 nm. The crystallization process indicated that the size of flaky raw materials gradually decreased and formed nano-sized particles as time prolonged. Therefore, the transformation mechanism followed the solution mediated mechanism, though only a little water was contained in the system. Compared with the conventional hydrothermal route, the solid-like state conversion not only significantly shortened the crystallization time, but also totally avoided the emission of waste liquids. In addition, for the methanol dehydration reaction, the nano-sized ZSM-5 aggregates obtained by this method showed much better catalytic performance, C2-C4 olefin selectivity and longer lifetime to endure coke deposition than the sample obtained by the hydrothermal route.
KeywordCrystallization Mechanism Hydrothermal Synthesis Nanocrystalline Zsm-5 Hierarchical Zsm-5 Nanosized Zsm-5 Zeolite Mfi Temperature Kaolin Identification Precursors
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1039/c4ta04073b
URL查看原文
Indexed BySCI
Language英语
WOS KeywordCRYSTALLIZATION MECHANISM ; HYDROTHERMAL SYNTHESIS ; NANOCRYSTALLINE ZSM-5 ; HIERARCHICAL ZSM-5 ; NANOSIZED ZSM-5 ; ZEOLITE MFI ; TEMPERATURE ; KAOLIN ; IDENTIFICATION ; PRECURSORS
WOS Research AreaChemistry ; Energy & Fuels ; Materials Science
WOS SubjectChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS IDWOS:000345531200033
Citation statistics
Cited Times:32[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/11812
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Inst Proc Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China
3.United Res Ctr Resource & Mat, Wuhai 016000, Peoples R China
Recommended Citation
GB/T 7714
Pan, Feng,Lu, Xuchen,Zhu, Qingshan,et al. A fast route for synthesizing nano-sized ZSM-5 aggregates[J]. JOURNAL OF MATERIALS CHEMISTRY A,2014,2(48):20667-20675.
APA Pan, Feng.,Lu, Xuchen.,Zhu, Qingshan.,Zhang, Zhimin.,Yan, Yan.,...&Chen, Shiwei.(2014).A fast route for synthesizing nano-sized ZSM-5 aggregates.JOURNAL OF MATERIALS CHEMISTRY A,2(48),20667-20675.
MLA Pan, Feng,et al."A fast route for synthesizing nano-sized ZSM-5 aggregates".JOURNAL OF MATERIALS CHEMISTRY A 2.48(2014):20667-20675.
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