Issue 5, 2016

Synthesis of Al-MTW with low Si/Al ratios by combining organic and inorganic structure directing agents

Abstract

A rationalized combination of alkali cations and bulky dicationic organic structure directing agents (OSDAs) has allowed the synthesis of the Al-rich MTW zeolites with Si/Al ratios of ∼12 and large pore accessibility. 27Al MAS NMR spectroscopy indicates that most of the aluminum atoms are in tetrahedral coordination in framework positions, and in situ infrared pyridine adsorption/desorption spectroscopy reveals strong Brönsted acidity after cationic exchange for the Al-rich MTW. In addition, another MTW material with a Si/Al ratio of 30 has been synthesized under alkali-free conditions using a bulky dicationic molecule such as OSDA, the lowest Si/Al ratio being achieved for a MTW zeolite synthesized in the absence of alkali-cations in the synthesis media. The catalytic activity of these MTW materials has been tested for the n-decane cracking reaction, achieving higher catalytic activities and olefin yields than other related large pore zeolites.

Graphical abstract: Synthesis of Al-MTW with low Si/Al ratios by combining organic and inorganic structure directing agents

Article information

Article type
Paper
Submitted
12 May 2015
Accepted
30 Jul 2015
First published
30 Jul 2015

New J. Chem., 2016,40, 4140-4145

Synthesis of Al-MTW with low Si/Al ratios by combining organic and inorganic structure directing agents

C. Paris, N. Martín, J. Martínez-Triguero, M. Moliner and A. Corma, New J. Chem., 2016, 40, 4140 DOI: 10.1039/C5NJ01203A

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