Strong protection capability of zeolite coating for AA6061 substrate from corrosion in NaCl, H 2 SO 4 and NaOH solution has been demonstrated with reduction of corrosion current by five orders of magnitude. Film resistance was identified as the governing parameter in the formation of a barrier shielding the penetration of aggressive species. For the MFI zeolite film growth on the surface of the AA6061 substrate, while the in situ crystallisation (InC) protocol generated loosely packed film made of large zeolite crystal, the dry-gel conversion (DGC) protocol prepared dense film comprising of nanoparticles. Superior protection ability of DGC-grown film is attributed to the increased film resistance associated with a dense and impermeable zeolite layer. As such, the DGCgrown film requiring thinner film thickness around 5 μm showed better anti-corrosion function than the InC-grown film.
The contribution focuses on the pore structure of mesoporous MFI and its catalytic properties in hexane isomerization. Base post treatment creates defected pore channels in MFI structure, thus enhances catalytic activity and unprecedentedly high dimethylbutane (DMB) yield far beyond shape selectivity restrictions. On the other hand, recrystallization post synthesis method forms a MFI/MCM-41 composite with MFI zeolite aggregates homogeneously supported inside MCM-41 channel and has the same global activity as MFI zeolite but having higher 23DMB product selectivity. The pore structures of both post treated MFI zeolite are elucidated from the changes in the product selectivity and sorption measurements.
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