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Highly Enhanced Phenol Hydroxylation in [h0h]-Oriented FeâZSM-5 Membranes
- Source :
- ChemCatChem. 1:472-478
- Publication Year :
- 2009
- Publisher :
- Wiley, 2009.
-
Abstract
- Catechol (CAT) and hydroquinone (HQ) are two important diphenol isomers with a variety of industrial applications. The hydroxylation of phenol catalyzed by transition metal (TM) substituted ZSM-5 is an environmentally benign route for diphenol production, which is usually governed by intracrystalline diffusion. Therefore, the availability of highly oriented TM-ZSM-5 membranes and their utilization in an interphase membrane reactor can significantly promote the hydroxylation of phenol. The continuous and [h0h]-oriented Fe-ZSM-5 membrane on the porous α-Al 2 O 3 was prepared using a new seeded growth method. Characterization was carried out by using SEM, XRD, UV/Vis, and EPMA techniques, which demonstrated that the [h0h]-oriented membrane consists of Fe substituted ZSM-5 crystal grains with an Si/Fe ratio of approximately 75. Compared with the catalytic performance of different sized Fe-ZSM-5 grains loaded in the traditional slurry reactor, the [h0h]-oriented Fe-ZSM-5 membrane in the interphase membrane reactor showed significantly improved phenol conversion and selectivity for CAT and HQ due to the molecular path control in the zeolite membranes.
Details
- ISSN :
- 18673899 and 18673880
- Volume :
- 1
- Database :
- OpenAIRE
- Journal :
- ChemCatChem
- Accession number :
- edsair.doi...........226fe6b7b174de9bfa094ce2eb4063ff