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Compressed CO 2 Accelerated the Synthesis of Mesoporous Heteroatom‐Substituted Aluminophosphates for Enhanced Catalytic Activity
Author(s) -
Wang Fangxiao,
Liang Lin,
Ma Jun,
Shi Lei,
Sun Jianmin
Publication year - 2014
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.201402060
Subject(s) - heteroatom , chemistry , catalysis , mesoporous material , crystallization , zeolite , chemical engineering , styrene , organic chemistry , ring (chemistry) , polymer , copolymer , engineering
AFI‐structured zeolites of aluminophosphates AlPO‐5 and heteroatom‐substituted aluminophosphates MeAPO‐5 (Me = Fe, Co) have been synthesized in the presence of compressed CO 2 , the synthesized materials exhibiting mesoporosity without the use of additional mesotemplates. The mesoporosity was introduced by CO 2 ‐in‐water emulsions acting as mesotemplate during the crystallization of the zeolites. In addition, the crystallization time was shortened in compressed CO 2 compared with the conventional synthesis in the absence of CO 2 . The synthesized aluminophosphates MeAPO‐5 (Me = Fe, Co) displayed much higher activities in the oxidation of styrene than conventional aluminophosphates MeAPO‐5 (Me = Fe, Co) due to the presence of mesopores in the former catalysts, which favor the diffusion of reactants and products. The compressed CO 2 method provides a simple, green, and economic route to hierarchical zeolites, which are of great importance for industrial applications.