SAPO-34 synthesized with n-butylamine as a template and its catalytic application in the methanol amination reaction

doi:10.1016/S1872-2067(17)62775-X

Abstract

Abstract:

SAPO-34 was synthesized with n-butylamine (BA) as a template for the first time. Crystallization temperature and initial Si amount were important factors leading to successful syntheses. Lamellar AlPO-kanemite tends to form as the major phase or as an impurity of SAPO-34 at lower crystallization temperatures, though a higher initial Si amount may offer a positive effect on the crystallization of SAPO-34 that mitigates the low temperature. Higher temperature (240℃) can effectively suppress the generation of lamellar materials and allow the synthesis of pure SAPO-34 with a wider range of Si incorporation. The crystallization processes at 200 and 240℃ were investigated and compared. We used the aminothermal method to synthesize SAPO-34-BA at 240℃ and also found n-propylamine is a suitable template for the synthesis of SAPO-34. The SAPO-34-BA products were characterized by many techniques. SAPO-34-BA has good thermal stability, crystallinity and porosity. BA remained intact in the crystals with ~1.8 BA molecule per chabazite cage. The catalytic performance of SAPO-34 was tested in the methanol amination reaction, which showed high methanol conversion and selectivity for methylamine plus dimethylamine under the conditions investigated, suggesting that this material is a good candidate for the synthesis of methylamines.

Key words: SAPO-34 molecular sieve, n-Butylamine, Primary amine, Synthesis, High temperature, Methanol amination

Yuyan Qiao, Pengfei Wu, Xiao Xiang, Miao Yang, Quanyi Wang, Peng Tian, Zhongmin Liu. SAPO-34 synthesized with n-butylamine as a template and its catalytic application in the methanol amination reaction[J]. Chinese Journal of Catalysis, DOI: 10.1016/S1872-2067(17)62775-X.

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https://www.cjcatal.com/EN/Y2017/V38/I3/574

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