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  

Influence of the Concentration of Tetraethylammonium Hydroxide as Template on Structure and Thermal Decomposition of as-Synthesized Beta Zeolite

作　　者：谢在库[1] 陈庆龄[2] 张成芳[1] 陈波[2] 陆丽元[2] 

机构地区：[1]华东理工大学化工工艺研究所,上海200237 [2]上海石油化工研究院,上海201208

出　　处：《Chinese Journal of Chemical Physics》2000年第1期89-94,共6页化学物理学报（英文）

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。Effects of the concentration of tetraethylammonium hydroxide(TEA-OH) in gel on the structure and the thermal decomposition of as-synthesize polite 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 dosely related to the TEA content in as-synthesized Beta zeolite.

关 键 词：Β沸石 结构 脱胺 TEA-OH模板剂 

分 类 号：O643.3[理学—物理化学]