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Synthesis of ATN‐Type FeAPO‐39 Molecular Sieves without Solvent using the Additional Structure‐Directing Effect of the Iron Source
Author(s) -
Zhao Xinhong,
Wang Qingpeng,
Duan Weiting,
Li Guixian,
Ji Dong,
Zhao Yu
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201800729
Subject(s) - molecular sieve , chemistry , solvent , zeolite , crystallization , aluminosilicate , elemental analysis , fourier transform infrared spectroscopy , mössbauer spectroscopy , infrared spectroscopy , physisorption , inorganic chemistry , nuclear chemistry , chemical engineering , crystallography , organic chemistry , catalysis , engineering
ATN‐type FeAPO‐39 molecular sieves with high iron content has been successfully synthesized under non‐solvent conditions, which is the first example of iron‐incorporated aluminophosphate with the ATN‐zeotype structure. The optimum synthetic conditions of this material were refined. It was found that the following synthetic conditions, i.e. a low P 2 O 5 /Al 2 O 3 ratio, a high DPA/Al 2 O 3 ratio (DPA: di‐ n ‐propylamine) and an elevated crystallization temperature, seemed to be more favorable for the non‐solvent synthesis of ATN phase. The composition and structural characteristics of resultant relatively pure FeAPO‐39 molecular sieves were intensively studied by XRD, FT‐IR, TG‐DTA, CHN elemental analysis, ICP‐AES, SEM, TEM, N 2 physisorption, UV/Vis diffuse reflectance spectroscopy and Mössbauer spectroscopy analyses. The iron content and zeolite yield of FeAPO‐39 material were found to be as high as 5.56 wt.‐% and 82.6 %, respectively. The results of FT‐IR, TG‐DTA and CHN elemental analysis indicate that DPA molecules may co‐direct the synthesis of ATN zeolites along with additional structure‐directing agent NH 4 + ions resulting from iron source. Owing to the specific structure‐directing role provided by iron source, the synthetic strategy presented here may find a potential application in the non‐solvent synthesis of other aluminosilicate and aluminophosphate zeolites with novel frameworks.