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23-P-19 - Hydration of α-pinene over heteropolyacids encaged in USY zeolites
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23-P-18 - Vapor phase Beckmann rearrangement of cyclohexanone oxime over tantalum pillared magadiite S.J. Kim (a), M.H. Kim (a), Y. Ko (a), G. Seo (b) and Y.S. Uh (a) a KIST, P.O. Box 131, Cheongryang, Seoul 130-650, uhvoun~kistmail.kist.re.kr, Korea b Chonnam National University, Kwang/u 500-757, Korea Vapor phase Beckmann rearrangement of cyclohexanone oxime to e-caprolactam has been carried out using tantalum-pillared magadiites (Ta-magadiites) with different surface areas as catalysts. The Ta-magadiite catalysts of relatively large surface areas showed high catalytic activities, due to a large number of active sites. For the Ta-magadiite catalyst of the largest surface area, the oxime conversion reached 99.1% with 97.5 % of lactam selectivity. FT-IR and NH3-TPD results demonstrated that the new hydroxyl groups and a large amount of acidic sites generated by Ta pillaring into the magadiite interlayer were responsible for the high catalytic performance of Ta-magadiite catalyst.
23-P-19 - Hydration of cz-pinene over heteropolyacids encaged in USY zeolites J. Vital a*, A.M. Ramos a, I.F. Silva a, J.E. Castanheiro a, M.N. Blanco b, C. Caceres b, P. Vasquez b, L. Pizzio b and H. Thomas b CQFB, Faculdade de Ci~ncias e Tecnologia, Universidade Nova de Lisboa, 2825-114 CAPARICA, Portugal. E-mail."[email protected], unl.pt b Conicet, UNLP, Cindeca 47, n ~257, 1900 La Plata, Argentina The catalytic performance of dodecamolibdophosphoric acid (PMol2) encaged in the supercages of zeolite USY or silica supported, was compared concerning the hydration of otpinene in aqueous acetone at 50 ~ C. A selectivity value of 75%, towards cz-terpineol, was achieved with the encaged PMol2, at total conversion. Selectivity values obtained with the encaged catalyst are similar to those obtained with the free PMol2, but higher than those obtained with the silica supported HPA.
23-P-20 - Selective adsorption of t r a n s unsaturated fatty acid compounds in MFI type zeolites S. Paulussen, M. Goddeeris and P.A. Jacobs Katholieke Universiteit Leuven, Centrum voor Oppervlaktechemie en Katalyse, Kasteelpark Arenberg 23, B-3001 Heverlee, Belgium ([email protected]) A zeolite structure that selectively adsorbs trans unsaturated fatty acid compounds in the presence of their cis unsaturated counterparts is selected among several topologies using a liquid phase chromatographic study of the adsorption of oleic and elaidic acid methylester. The functioning of the present adsorbent is based on the restricted adsorption of the curved cis unsaturated compounds in the pores of highly siliceous MFI type zeolites while the straight trans isomers experience significantly less limitations. The present selectivity is retained when the complexity of the substrate molecules is gradually increased from methylesters to triacylglycerols.
23-P-18 - Vapor phase Beckmann rearrangement of cyclohexanone oxime over tantalum pillared magadiite S.J. Kim (a), M.H. Kim (a), Y. Ko (a), G. Seo (b) and Y.S. Uh (a) a KIST, P.O. Box 131, Cheongryang, Seoul 130-650, uhvoun~kistmail.kist.re.kr, Korea b Chonnam National University, Kwang/u 500-757, Korea Vapor phase Beckmann rearrangement of cyclohexanone oxime to e-caprolactam has been carried out using tantalum-pillared magadiites (Ta-magadiites) with different surface areas as catalysts. The Ta-magadiite catalysts of relatively large surface areas showed high catalytic activities, due to a large number of active sites. For the Ta-magadiite catalyst of the largest surface area, the oxime conversion reached 99.1% with 97.5 % of lactam selectivity. FT-IR and NH3-TPD results demonstrated that the new hydroxyl groups and a large amount of acidic sites generated by Ta pillaring into the magadiite interlayer were responsible for the high catalytic performance of Ta-magadiite catalyst.
23-P-19 - Hydration of cz-pinene over heteropolyacids encaged in USY zeolites J. Vital a*, A.M. Ramos a, I.F. Silva a, J.E. Castanheiro a, M.N. Blanco b, C. Caceres b, P. Vasquez b, L. Pizzio b and H. Thomas b CQFB, Faculdade de Ci~ncias e Tecnologia, Universidade Nova de Lisboa, 2825-114 CAPARICA, Portugal. E-mail."[email protected], unl.pt b Conicet, UNLP, Cindeca 47, n ~257, 1900 La Plata, Argentina The catalytic performance of dodecamolibdophosphoric acid (PMol2) encaged in the supercages of zeolite USY or silica supported, was compared concerning the hydration of otpinene in aqueous acetone at 50 ~ C. A selectivity value of 75%, towards cz-terpineol, was achieved with the encaged PMol2, at total conversion. Selectivity values obtained with the encaged catalyst are similar to those obtained with the free PMol2, but higher than those obtained with the silica supported HPA.
23-P-20 - Selective adsorption of t r a n s unsaturated fatty acid compounds in MFI type zeolites S. Paulussen, M. Goddeeris and P.A. Jacobs Katholieke Universiteit Leuven, Centrum voor Oppervlaktechemie en Katalyse, Kasteelpark Arenberg 23, B-3001 Heverlee, Belgium ([email protected]) A zeolite structure that selectively adsorbs trans unsaturated fatty acid compounds in the presence of their cis unsaturated counterparts is selected among several topologies using a liquid phase chromatographic study of the adsorption of oleic and elaidic acid methylester. The functioning of the present adsorbent is based on the restricted adsorption of the curved cis unsaturated compounds in the pores of highly siliceous MFI type zeolites while the straight trans isomers experience significantly less limitations. The present selectivity is retained when the complexity of the substrate molecules is gradually increased from methylesters to triacylglycerols.