CHEN Bin, YUAN Xia, WU Jian, LUO He’an

(College of Chemical Engineering, Xiangtan University , Hunan xiangtan 411105)

Abstract: Manganese aluminophosphate of type 36 (MnAPO-36) molecular sieve was hydrothermally synthesized in situ using pseudo-boehmite, phosphoric acid(85％), tetrahydrate manganese acetate as raw material and tripropylamine as templating agent. Characterization of the synthesis products was performed using FT-IR, SEM, XRD, TG-DSC and NH3-TPD. The influence of crystallization temperature and crystallization time on the crystallinity of MnAPO-36 molecular sieve were investigated. The results showed that small amounts of MnAPO-5 always crystallinzed parallel to the MnAPO-36 material under hydrothermal conditions when tripropylamine was used as organic template. Highly crystalline MnAPO-36 molecular sieve was crystallized in two temperature steps, namely at 100℃ for 50h and subsequently at 150℃ for 24h.

Keywords: MnAPO-36, Aluminophosphate molecular sieve, in-situ hydrothermal synthesis

E-mail: yuanxia@xtu.edu.cn

Journal of Molecular Catalysis, Vol. 24, Issue 2, 2010, 136-141