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A low-temperature approach to synthesize low-silica SAPO-34 nanocrystals and their application in the methanol-to-olefins (MTO) reaction
Gao, Beibei1,2; Yang, Miao1; Qiao, Yuyan1,2; Li, Jinzhe1; Xiang, Xiao1,2; Wu, Pengfei1,2; Wei, Yingxu1; Xu, Shutao1; Tian, Peng1; Liu, Zhongmin1
Source PublicationCATALYSIS SCIENCE & TECHNOLOGY
2016
ISSN2044-4753
DOI10.1039/c6cy01461e
Volume6Issue:20Pages:7569-7578
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
WOS KeywordSILICOALUMINOPHOSPHATE MOLECULAR-SIEVES ; SOLID-STATE NMR ; REACTION-MECHANISM ; HYDROCARBON FORMATION ; CATALYTIC-ACTIVITY ; THERMAL-STABILITY ; LIGHT OLEFINS ; CO-REACTION ; ZEOLITE ; DEACTIVATION
AbstractA low-temperature strategy is developed for the synthesis of low-silica SAPO-34 with a tunable Si content and relatively uniform Si distribution in the crystals, which is hitherto difficult to achieve. It is demonstrated that a lower crystallization temperature and a silicon source with relatively low reactivity are important factors leading to successful synthesis. The crystal size of SAPO-34 could be effectively decreased to 200 nm through a seed-assisted approach. The local atom environments of low-silica samples are investigated by solid state MAS NMR, which confirms the unique existence of Si(4Al) species in the framework. The obtained low-silica SAPO-34 exhibits excellent catalytic performance in the MTO reaction and the occurrence of catalyst deactivation varies with the acid properties. Through optimizing the Si content of the samples, a long catalyst life and a high initial/maximum selectivity to ethylene plus propylene could be achieved simultaneously over SAPO-34 with a Si content of Si/(Si + Al + P) = 0.047. This result would be valuable for the improvement of the catalytic properties of SAPO-34 used for a commercial MTO fluidized-bed reactor. However, SAPO-34 with a very low Si content (e.g. Si/(Si + Al + P) = 0.039) exhibits a shortened catalyst life due to the insufficient Bronsted acid sites in spite of the high selectivity to light olefins.
Language英语
WOS IDWOS:000386210100021
PublisherROYAL SOC CHEMISTRY
Citation statistics
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/169979
Collection中国科学院大连化学物理研究所
Corresponding AuthorTian, Peng; Liu, Zhongmin
Affiliation1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Natl Engn Lab Methanol Olefins, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Gao, Beibei,Yang, Miao,Qiao, Yuyan,et al. A low-temperature approach to synthesize low-silica SAPO-34 nanocrystals and their application in the methanol-to-olefins (MTO) reaction[J]. CATALYSIS SCIENCE & TECHNOLOGY,2016,6(20):7569-7578.
APA Gao, Beibei.,Yang, Miao.,Qiao, Yuyan.,Li, Jinzhe.,Xiang, Xiao.,...&Liu, Zhongmin.(2016).A low-temperature approach to synthesize low-silica SAPO-34 nanocrystals and their application in the methanol-to-olefins (MTO) reaction.CATALYSIS SCIENCE & TECHNOLOGY,6(20),7569-7578.
MLA Gao, Beibei,et al."A low-temperature approach to synthesize low-silica SAPO-34 nanocrystals and their application in the methanol-to-olefins (MTO) reaction".CATALYSIS SCIENCE & TECHNOLOGY 6.20(2016):7569-7578.
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