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Influence of the Concentration of Tetraethylammonium Hydroxide as Template on Structure and Thermal Decomposition of as-Synthesized Beta Zeolite
Xie Zaiku,Chen Qingling,Zhang Chengfang,Cheng Bo,Lu Liyuan
Author NameAffiliation
Xie Zaiku Institute of Chemical Technology,East China University of Science and Technology,Shanghai 200237 
Chen Qingling Shanghai Research Institute of Petrochemical Technology,Shanghai 201208 
Zhang Chengfang Institute of Chemical Technology,East China University of Science and Technology,Shanghai 200237 
Cheng Bo Shanghai Research Institute of Petrochemical Technology,Shanghai 201208 
Lu Liyuan Shanghai Research Institute of Petrochemical Technology,Shanghai 201208 
Abstract:
Effects of the concentration of tetraethylammonium hydroxide(TEA-OH)in gel on the structure and the thermal decomposition of as-synthesized zeolite Beta have been explored.Under synthetic conditions of this study,the optimum concentration of TEA-OH(TEA+/Al)is from 2.10 to 1.68,the relative crystallinity of synthetic β-zeolite is over 84%.The relationship between aluminium content(Al/Al+Si)or framework aluminum content(TdAl/TdAl+OhAl) in β-zeolite and TEA+/Al ratio in gel,has an optimum point.At the optimum point of TEA+/Al in gel with 1.9,Beta zeolite with a lower non-framework aluminium(OhAl) content and a higher framework Si/Al ratio can be obtained.The thermal decomposition of as-synthesized Beta zeolite is Hofmann degradation,and the weight-loss by TGA,the total endotherm by DSC are closely related to the TEA content in as-synthesized Beta zeolite.
Key words:  β-eolite,TEA-OH template,Zeolite structure,TEA decomposition,Hofmann degradation
FundProject:
模板剂四乙基氢氧化铵的用量对合成的β沸石结构及脱胺的影响
谢在库,陈庆龄,张成芳,陈波,陆丽元
摘要:
研究四乙基氢氧化铵(TEA-OH)模板剂用量对合成的β沸石的结构及脱胺行为的影响。合成β沸石的模板剂的较佳用量(TEA+/Al)为2.10~1.68,合成的β沸石的相对结晶度均大于84%;β沸石中的铝含量(Al/Al+Si)及骨架铝含量(TdAl/TdAl+OhAl)随晶化混合液的TEA+/Al而变,存在最佳TEA+/Al点为1.9,此时合成的β沸石非骨架铝量最少,结构硅铝比最高;含TEA的β沸石脱胺过程为Hofmann降解反应,TGA测定的失重量、DSC测定的吸热量与β沸石中TEA含量密切相关.
关键词:  β沸石  TEA-OH模板剂  结构  脱胺  Hofmann降解反应
DOI:10.1088/1674-0068/13/1/89-94
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