Výsledky vyhledávání - "Rogério Matheus Vargas"

Guanidines encapsulated in zeolite Y and anchored to MCM-41: synthesis and catalytic activity

Autor: Roger A. Sheldon, Ricardo Sercheli, Rogério Matheus Vargas, Ulf Schuchardt

Publikováno v: Journal of Molecular Catalysis A: Chemical. 148:173-181

The preparation and characterisation of guanidines encapsulated in zeolite Y and anchored to MCM-41 are described. The catalytic activity of the immobilised and free guanidines were tested in the aldol reaction of benzaldehyde with acetone. In homoge

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3232bf0b2a2c82308f51a3368ddecc78
https://doi.org/10.1016/s1381-1169(99)00054-0

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Alkylguanidine-catalyzed heterogeneous transesterification of soybean oil

Autor: Ricardo Sercheli, Rogério Matheus Vargas, Ulf Schuchardt

Publikováno v: Journal of the American Oil Chemists' Society. 76:1207-1210

Transesterification of soybean oil with methanol has been carried out in the presence of heterogenized alkylguanidines as catalysts. The alkylguanidines were anchored to modified polystyrene or siliceous MCM-41, encapsulated in the supercages of zeol

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::901063a373f365381aaa4e1590fa2fc1
https://doi.org/10.1007/s11746-999-0095-2

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1 H nuclear magnetic resonance determination of the yield of the transesterification of rapeseed oil with methanol

Autor: Georges Gelbard, O. Brès, F. Vielfaure, Rogério Matheus Vargas, Ulf Schuchardt

Publikováno v: Journal of the American Oil Chemists' Society. 72:1239-1241

The formation of fatty acid methyl esters by transesterification with methanol can be monitored by1H nuclear magnetic resonance spectroscopy; this accurate determination is simpler than chromatographic methods.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5ca54c264e5284e82db1c07ca433ea20
https://doi.org/10.1007/bf02540998

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Transesterification of vegetable oils: a review

Autor: Ulf Schuchardt, Rogério Matheus Vargas, Ricardo Sercheli

Publikováno v: Journal of the Brazilian Chemical Society, Volume: 9, Issue: 3, Pages: 199-210, Published: MAY 1998
Journal of the Brazilian Chemical Society, Vol 9, Iss 3, Pp 199-210 (1998)
Journal of the Brazilian Chemical Society v.9 n.3 1998
Journal of the Brazilian Chemical Society
Sociedade Brasileira de Química (SBQ)
instacron:SBQ

The transesterification of vegetable oils with methanol as well as the main uses of the fatty acid methyl esters are reviewed. The general aspects of this process and the applicability of different types of catalysts (acids, alkaline metal hydroxides

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d01111da10eb4619de1f3a7faf06a8f1
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531998000300002&lng=en&tlng=en

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Encapsulation of N,N′,N″-tricyclohexylguanidine in hydrophobic zeolite Y: Synthesis and catalytic activity

Autor: Ricardo Sercheli, Mário César Guerreiro, Roger A. Sheldon, Ulf Schuchardt, Alfredo L. B. Ferreira, Rogério Matheus Vargas

Publikováno v: Repositório Institucional da UFBA
Universidade Federal da Bahia (UFBA)
instacron:UFBA

Texto completo: acesso restrito. p.1325–1328 Submitted by Suelen Reis (suelen_suzane@hotmail.com) on 2013-02-04T14:24:50Z No. of bitstreams: 1 Sercheli.pdf: 170840 bytes, checksum: a8ae02fd1c2216796aa0a31d3326e933 (MD5) Made available in DSpace on

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3af308439fd2a1fa4a9e9269211ab19c
http://www.repositorio.ufba.br/ri/handle/ri/8333

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Transesterification of soybean oil catalyzed by alkylguanidines heterogenized on different substituted polystyrenes

Autor: Ulf Schuchardt, Georges Gelbard, Rogério Matheus Vargas

Publikováno v: Journal of Molecular Catalysis A: Chemical
Journal of Molecular Catalysis A: Chemical, Elsevier, 1996, 109, pp.37-44

1,5,7-Triazabicyclo[4.4.0]dec-5-ene and 1,1,3,3-tetramethylguanidine were heterogenized on different chloromethylated poly(styrene/divinylbenzene), as well as on linear polystyrene after introduction of a ‘spacer-arm’. Furthermore, polymeric 2,3-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::be4347d90e63e4ea2efc301214260706
https://hal.archives-ouvertes.fr/hal-00006415

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Alkylguanidines as catalysts for the transesterification of rapeseed oil

Autor: Georges Gelbard, Ulf Schuchardt, Rogério Matheus Vargas

Publikováno v: Journal of Molecular Catalysis A: Chemical
Journal of Molecular Catalysis A: Chemical, Elsevier, 1995, 99, pp.65-70

The transesterification of rapeseed oil with methanol has been studied in the presence of eight substituted cyclic and acyclic guanidines and compared with unsubstituted guanidine. The catalytic activity of the guanidines depends mainly on their intr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e5a599abb1911428ddd38de0cc9cb3b
https://hal.archives-ouvertes.fr/hal-00006126

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Preparation of monoglycerides by guanidine-catalyzed processes

Autor: Rogério Matheus Vargas, L.G. Aguiar

Publikováno v: Journal of the American Oil Chemists' Society. 75:755-756

Glycerolysis of methyl stearate and tristearin has been carried out in the presence of alkylguanidines—strong nonionic bases—as catalysts. When applied at 10 mol%, 1,5,7-triazabicyclo [4.4.0]dec-5-ene, 1,2,3-tricyclohexylguanidine, and 1,3-dicycl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d069c1b8236102999f13b19f78d3758c
https://doi.org/10.1007/s11746-998-0221-6

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