Journal
CHEMICAL ENGINEERING JOURNAL
Volume 226, Issue -, Pages 367-376Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.04.072
Keywords
Zeolites; ZSM-23 (MTT); Crystal size; Microwave-assisted synthesis; Crystallization kinetics
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Funding
- King Abdulaziz City for Science and Technology (KACST) through the Science & Technology Unit at King Fand University of Petroleum & Minerals (KFUPM) [10-NAN1391-04]
- National Science, Technology and Innovation Plan
- New Energy and Industrial Technology Development Organization (NEDO)
- Grants-in-Aid for Scientific Research [25630352] Funding Source: KAKEN
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The nucleation and growth of MTT zeolite, an important 10-membered ring (10 MR) zeolite, was controlled by a microwave-assisted hydrothermal synthesis. The effect of irradiation time (12,18, and 24 h), seed-assisted synthesis with 1 wt.% seeds for 6 h and desilication under microwave irradiation on crystallinity and porosity were investigated. Under microwave-assisted synthesis, uniform crystal size, with lower crystal aspect-ratio and suppressed phase-impurity has been obtained. The tendency of column-like crystal to form bundle of columns was reduced significantly. Seeded growth further reduced synthesis time to 6 h. Post-synthetic treatment was used to obtain larger pore volume of MTT zeolites. Some of the protonated MTT samples were tested in n-hexane cracking as model reaction. Characterization techniques such as XRD, FE-SEM, N-2 adsorption-desorption, Al-27 MAS NMR and NH3-TPD have been carried out to obtain insight in the physico-chemical properties of zeolite catalysts. (C) 2013 Elsevier B.V. All eights reserved.
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