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采用水热法以二乙胺为模板剂合成SAPO-34分子筛,考察了不同晶化时间对SAPO-34晶体结构、形貌的影响,并研究了用SAPO-34分子筛在氮气气氛下碳化的样品制备修饰玻碳电极的催化性能。结果表明,不同晶化时间合成的SAPO-34分子筛晶形差异较大,较佳晶化时间为2.5 h;延长晶化时间,SAPO-34晶体相对结晶度变化不大。晶化时间为2.5 h的SAPO-34样品以弱酸为主,并且经过碳化处理后制备的修饰电极对甲醛具有较好的催化氧化作用。
SAPO-34 molecular sieve was synthesized by hydrothermal method using diethylamine as template. The effects of different crystallization time on the structure and morphology of SAPO-34 crystal were investigated. The samples carbonized by SAPO-34 molecular sieve under nitrogen atmosphere were investigated. Preparation of modified glassy carbon electrode catalytic performance. The results show that the crystal shape of SAPO-34 synthesized by different crystallization time is quite different. The optimum crystallization time is 2.5 h. When the crystallization time is extended, the relative crystallinity of SAPO-34 crystal does not change much. The SAPO-34 sample with crystallization time of 2.5 h mainly contains weak acid, and the carbonized electrode has good catalytic oxidation to formaldehyde.