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Article: A heterostructured titanium silicalite-1 catalytic composite for cyclohexanone ammoximation

TitleA heterostructured titanium silicalite-1 catalytic composite for cyclohexanone ammoximation
Authors
KeywordsAmmoximation
Catalyst recycling
Clay
Supported catalyst
Titanium silicalite-1
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/micromeso
Citation
Microporous And Mesoporous Materials, 2009, v. 120 n. 3, p. 368-374 How to Cite?
AbstractSubmicron-sized titanium silicalite-1 is difficult to recover in industrial process because of their fineness and rapid decrease in catalytic activity due to particle agglomeration. To solve these problems, we present a heterostructured titanium silicalite-1 (TS-1) catalytic composite using bentonite clay as the catalyst support. The catalytic composite is synthesized by hydrothermal treatment which directly crystallizes TS-1 on the bentonite clay surface. The synthesized composite has been characterized using scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. The TS-1 crystals have been found on and between the layers of the bentonite with strong attachment. Characterizations suggest that crystallization temperature of 175 °C is the optimum hydrothermal temperature to produce TS-1 on the bentonite support with characteristics necessary to promote selective catalytic reactions. It is found that prolonged crystallization duration does not necessarily increase the crystallinity of TS-1 on the bentonite surface. The heterostructured composite is able to maintain high conversion of cyclohexanone (97%) and oxime selectivity (83%) after three reaction cycles which is contrary to the unsupported TS-1 that shows apparent decrease in activity (>10%), especially in the selectivity to oxime. The synthesized composite also has significant improvement in separation efficiency with respect to the unsupported catalytic system. Therefore, we conclude that the heterostructured TS-1 composite is a promising catalytic material for cyclohexanone ammoximation and potentially for other TS-1 related processes where catalyst recovery and reuse are required. © 2008 Elsevier Inc. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/132373
ISSN
2015 Impact Factor: 3.349
2015 SCImago Journal Rankings: 1.243
ISI Accession Number ID
Funding AgencyGrant Number
National Natural Science Foundation of China20518001
Research Grants Council of Hong KongN-HKUST620/05
605108
Funding Information:

We acknowledge the financial support from the National Natural Science Foundation of China (Project No. 20518001) and the Research Grants Council of Hong Kong under the Grant Nos. N-HKUST620/05 and 605108.

References

 

DC FieldValueLanguage
dc.contributor.authorYip, ACKen_HK
dc.contributor.authorLam, FLYen_HK
dc.contributor.authorHu, Xen_HK
dc.date.accessioned2011-03-28T09:23:49Z-
dc.date.available2011-03-28T09:23:49Z-
dc.date.issued2009en_HK
dc.identifier.citationMicroporous And Mesoporous Materials, 2009, v. 120 n. 3, p. 368-374en_HK
dc.identifier.issn1387-1811en_HK
dc.identifier.urihttp://hdl.handle.net/10722/132373-
dc.description.abstractSubmicron-sized titanium silicalite-1 is difficult to recover in industrial process because of their fineness and rapid decrease in catalytic activity due to particle agglomeration. To solve these problems, we present a heterostructured titanium silicalite-1 (TS-1) catalytic composite using bentonite clay as the catalyst support. The catalytic composite is synthesized by hydrothermal treatment which directly crystallizes TS-1 on the bentonite clay surface. The synthesized composite has been characterized using scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. The TS-1 crystals have been found on and between the layers of the bentonite with strong attachment. Characterizations suggest that crystallization temperature of 175 °C is the optimum hydrothermal temperature to produce TS-1 on the bentonite support with characteristics necessary to promote selective catalytic reactions. It is found that prolonged crystallization duration does not necessarily increase the crystallinity of TS-1 on the bentonite surface. The heterostructured composite is able to maintain high conversion of cyclohexanone (97%) and oxime selectivity (83%) after three reaction cycles which is contrary to the unsupported TS-1 that shows apparent decrease in activity (>10%), especially in the selectivity to oxime. The synthesized composite also has significant improvement in separation efficiency with respect to the unsupported catalytic system. Therefore, we conclude that the heterostructured TS-1 composite is a promising catalytic material for cyclohexanone ammoximation and potentially for other TS-1 related processes where catalyst recovery and reuse are required. © 2008 Elsevier Inc. All rights reserved.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/micromesoen_HK
dc.relation.ispartofMicroporous and Mesoporous Materialsen_HK
dc.subjectAmmoximationen_HK
dc.subjectCatalyst recyclingen_HK
dc.subjectClayen_HK
dc.subjectSupported catalysten_HK
dc.subjectTitanium silicalite-1en_HK
dc.titleA heterostructured titanium silicalite-1 catalytic composite for cyclohexanone ammoximationen_HK
dc.typeArticleen_HK
dc.identifier.emailLam, FLY:kefrank@hku.hken_HK
dc.identifier.authorityLam, FLY=rp01470en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.micromeso.2008.12.003en_HK
dc.identifier.scopuseid_2-s2.0-60949090109en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-60949090109&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume120en_HK
dc.identifier.issue3en_HK
dc.identifier.spage368en_HK
dc.identifier.epage374en_HK
dc.identifier.isiWOS:000264971200026-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridYip, ACK=8956194800en_HK
dc.identifier.scopusauthoridLam, FLY=7102075931en_HK
dc.identifier.scopusauthoridHu, X=7404709975en_HK

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