Issue 27, 2014

Synthesis and structural characterization of Al-containing interlayer-expanded-MWW zeolite with high catalytic performance

Abstract

Treatment of the zeolitic layered precursor of Al-MWW, so-called Al-MWW(P), with diethoxydimethylsilane (DEDMS) in acidic media leads to the formation of an aluminosilicate-type interlayer-expanded zeolite MWW (Al-IEZ-MWW) with expanded 12-membered ring (12-MR) micropores. However, the silylation process under acidic conditions simultaneously causes dealumination from the MWW framework, resulting in a decrease in the acid amount. We have developed a method for preparing Al-IEZ-MWW without leaching of the Al species. The strategy is to conduct the silylation under weakly acidic conditions; the silylation was conducted in an aqueous solution of an ammonium salt, e.g., NH4Cl, instead of HNO3. Subsequent additional acid treatment led to the formation of Al-IEZ-MWW that shows a high catalytic performance in the acylation of anisole compared to typical Al-MWW as well as Al-IEZ-MWW directly prepared under acidic conditions. The change in the state of Al atoms during the preparation process was investigated by high-resolution solid-state 27Al MAS NMR and 27Al MQMAS NMR techniques.

Graphical abstract: Synthesis and structural characterization of Al-containing interlayer-expanded-MWW zeolite with high catalytic performance

Article information

Article type
Paper
Submitted
03 2 2014
Accepted
12 3 2014
First published
14 3 2014

Dalton Trans., 2014,43, 10584-10592

Author version available

Synthesis and structural characterization of Al-containing interlayer-expanded-MWW zeolite with high catalytic performance

T. Yokoi, S. Mizuno, H. Imai and T. Tatsumi, Dalton Trans., 2014, 43, 10584 DOI: 10.1039/C4DT00352G

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