Effects of aluminum sources on synthesis and catalytic performance of b -oriented ZSM-5 coatings
Microporous and Mesoporous Materials, ISSN: 1387-1811, Vol: 244, Page: 164-170
2017
- 13Citations
- 28Captures
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Article Description
Highly b -oriented ZSM-5 zeolite coatings were synthesized on the inner surface of stainless steel tubes (2 mm i.d. and 400 mm length) precoated with a TiO 2 sublayer by in situ crystallization. Four aluminum sources (aluminum nitrate, pseudo boehmite, aluminum isopropoxide and aluminum diacetate) were used and their effects on the structure and catalytic performance of the as-synthesized coatings have been investigated. The characterizations of XRD, SEM, 27 Al MAS NMR and NH 3 −TPD revealed that the orientation and average size of crystals, continuity of zeolite layers, as well as their Si/Al ratio and acid properties, greatly affected by aluminum sources. The ZSM-5 layers synthesized with aluminum nitrate and pseudo boehmite (ANN-C and PB-C) had high b -orientation and almost full coverage, whereas those obtained with organic aluminum sources gave the opposite results. Compared with PB-C, ANN-C presented the small average size of crystals, low Si/Al ratio and large amount of acid sites. Catalytic cracking of n -dodecane at 500 °C and 4 MPa showed that ANN-C exhibited the most rapid cracking rate of n -dodecane and best stability. This is due to its highest b -orientation, which provides increased diffusion of n -dodecane and its cracking product molecules inside pore channels of ZSM-5 coatings.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1387181117301191; http://dx.doi.org/10.1016/j.micromeso.2017.02.057; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85014075138&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S1387181117301191; https://dx.doi.org/10.1016/j.micromeso.2017.02.057
Elsevier BV
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