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Synthesis and Surface Acidity of MeAPO‐5 Molecular Sieves
Author(s) -
Yang SzeMing,
Wu ShiawTzong,
Lin ShiowShyong
Publication year - 1988
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198800029
Subject(s) - chemistry , molecular sieve , cumene , desorption , ammonia , inorganic chemistry , thermal desorption spectroscopy , aluminium phosphate , scanning electron microscope , phosphate , catalysis , nuclear chemistry , adsorption , organic chemistry , physics , quantum mechanics
Metal substituted aluminum phosphate molecular sieves, MeAPO‐5 (Me = Co, Mn, Fe(II), Fe(III), and Mg) were synthesized and characterized with X‐ray diffraction and scanning electron microscopy. The acidity was determined by temperature programmed desorption of ammonia, Desorption peaks at around 200°C were observed for all the MeAPO samples studied. Additional desorption peaks at around 300°C were found in MnAPO‐5, CoAPO‐5, and MAPO‐5. MnAPO‐5, CoAPO‐5, and MAPO‐5 also show good activities toward the cracking reaction of cumene at 350°C, while Fe(II)APO‐5 and Fe(III)APO‐5 show some activity at 500°C. The order of the cracking activity correlates with the presence of strong acidic sites in MnAPO‐5, CoAPO‐5, and MAPO‐5 as indicated by the TPD of ammonia.