Vapor-Phase Reaction of Citronellal over Mesoporous Molecular Sieves MCM-41 and Zeolites

Niobium- and tantalum-containing mesoporous molecular sieves MCM-41 have been synthesized, and applied as a catalyst for vapor phase Beckmann rearrangement of cyclohexanone oxime to ε-caprolactam. NbMCM-41 catalyst exhibited high catalytic performance in the vapor phase Beckmann rearrangement of cyclohexanone oxime. The oxime conversions were almost 100% and the lactam selectivities were around 80%. The lactam selectivities of NbMCM-41 catalyst were higher than those of AlMCM-41 catalyst. However, TaMCM-41 catalyst exhibited lower catalytic performance than AlMCM-41 catalyst, and it was fast deactivated with time. These results may be due to the acidity difference among the catalysts. The results from NH3-TPD showed that NbMCM-41 catalyst possessed weak and medium acid sites, while TaMCM-41 catalyst possessed only very weak acid sites. AlMCM-41 catalyst also exhibited only weak acid sites.

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Vapour phase reaction of ethylbenzene with isopropyl acetate over mesoporous Al-MCM-41 molecular sieves

Journal of Molecular Catalysis A Chemical ◽

10.1016/j.molcata.2004.02.014 ◽

2004 ◽

Vol 216 (1) ◽

pp. 121-130 ◽

Cited By ~ 8

Author(s):

S Udayakumar ◽

A Pandurangan ◽

P.K Sinha

Keyword(s):

Molecular Sieves ◽

Vapour Phase ◽

Phase Reaction ◽

Isopropyl Acetate ◽

Mcm 41

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Kinetics of the Vapor Phase Reaction of Mercury and Halogens

Journal of the American Chemical Society ◽

10.1021/ja01301a026 ◽

1936 ◽

Vol 58 (10) ◽

pp. 1922-1924 ◽

Cited By ~ 6

Author(s):

Richard A. Ogg ◽

Henry C. Martin ◽

Philip A. Leighton

Keyword(s):

Vapor Phase ◽

Phase Reaction ◽

Vapor Phase Reaction ◽

Kinetics Of

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Effect of rehydration on the porosity of MCM-41 mesoporous molecular sieves

Theoretical and Experimental Chemistry ◽

10.1007/bf02511128 ◽

1999 ◽

Vol 35 (1) ◽

pp. 52-56

Author(s):

F. M. Bobonich ◽

Yu. G. Voloshina ◽

L. A. Matkovskaya ◽

V. N. Solomakha ◽

Yu. G. Gol’tsov

Keyword(s):

Molecular Sieves ◽

Mesoporous Molecular Sieves ◽

Mcm 41

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Ti incorporation in MCM-41 mesoporous molecular sieves using hydrothermal synthesis

Frontiers of Chemical Science and Engineering ◽

10.1007/s11705-014-1405-2 ◽

2014 ◽

Vol 8 (1) ◽

pp. 95-103 ◽

Cited By ~ 3

Author(s):

Shengping Wang ◽

Changqing Ma ◽

Yun Shi ◽

Xinbin Ma

Keyword(s):

Hydrothermal Synthesis ◽

Molecular Sieves ◽

Mesoporous Molecular Sieves ◽

Mcm 41

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Hoveyda–Grubbs type metathesis catalyst immobilized on mesoporous molecular sieves MCM-41 and SBA-15

Beilstein Journal of Organic Chemistry ◽

10.3762/bjoc.7.4 ◽

2011 ◽

Vol 7 ◽

pp. 22-28 ◽

Cited By ~ 27

Author(s):

Hynek Balcar ◽

Tushar Shinde ◽

Naděžda Žilková ◽

Zdeněk Bastl

Keyword(s):

Nmr Spectroscopy ◽

Molecular Sieves ◽

Direct Interaction ◽

Mesoporous Molecular Sieves ◽

Support Surface ◽

Wall Surface ◽

Ring Closing Metathesis ◽

Immobilized Catalysts ◽

Metathesis Catalyst ◽

Mcm 41

A commercially available Hoveyda–Grubbs type catalyst (RC303 Zhannan Pharma) was immobilized on mesoporous molecular sieves MCM-41 and on SBA-15 by direct interaction with the sieve wall surface. The immobilized catalysts exhibited high activity and nearly 100% selectivity in several types of alkene metathesis reactions. Ru leaching was found to depend on the substrate and solvent used (the lowest leaching was found for ring-closing metathesis of 1,7-octadiene in cyclohexane – 0.04% of catalyst Ru content). Results of XPS, UV–vis and NMR spectroscopy showed that at least 76% of the Ru content was bound to the support surface non-covalently and could be removed from the catalyst by washing with THF.

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