Zobrazeno 1 - 8
of 8
pro vyhledávání: '"Fábio G. Penha"'
Autor:
Selma Calgaroto, Cléber Calgaroto, Fábio G. Penha, Sibele B. C. Pergher, Luiz Carlos A. Oliveira
Publikováno v:
Eclética Química, Vol 36, Iss 3, Pp 47-53 (2018)
In this work, the comercial zeolites ZSM-5 and Y were submitted to previous ionic change with NH4NO3, followed by the addition of Nb. The incorporation of Nb on its structure aims increasing the acidity and improved the catalyst activity of these zeo
Externí odkaz:
https://doaj.org/article/a3cfabff92ab4d9f8fb640567bf2631e
Autor:
Janaina Piasson, Christian Wittee, Francine Bertella, Fábio G. Penha, Sibele B. C. Pergher, Helio C. M. Lengler
Publikováno v:
Química Nova, Vol 34, Iss 3, Pp 468-471 (2011)
Clay is often employed as a catalyst, but quartz impurities can decrease the catalytic efficiency. Fine particles of clay can be purified by flotation. We examined the cationic surfactant hexadecyltrimethylammonium bromide (HTAB), the anionic sodium
Externí odkaz:
https://doaj.org/article/44a38979d3324c4d9e03e74ca151f08c
Autor:
Jean C. Merg, Franciele Rossett, Fábio G. Penha, Sibele B. C. Pergher, Diego I. Petkowicz, João H. Z. dos Santos
Publikováno v:
Química Nova, Vol 33, Iss 7, Pp 1525-1528 (2010)
This work proposes the study of heterogeneous photocatalysis using TiO2 impregnated in zeolites beta, ZSM-5, mordenite, NaXb, NaXp and NaY for the decomposition of methylene blue. The catalysts were characterized by XRD, IR, textural analyses by N2 a
Externí odkaz:
https://doaj.org/article/7088ec0eb64f4e639bcd179e4cec958c
Autor:
Álvaro L. Malvesti, Marcelo L. Mignoni, Robison P. Scherer, Fábio G. Penha, Sibele B. C. Pergher
Publikováno v:
Química Nova, Vol 32, Iss 6, Pp 1491-1494 (2009)
This paper deals with an adosrption of sulphur compounds employing zeolites containing zinc. The zeolites employed were commercial NaY and Beta. The zinc was incorporated in three levels: 0.5; 1.0 and 5%. The sulphur compounds studied were benzothiop
Externí odkaz:
https://doaj.org/article/410c83f0ba5141d49c4fe450e7c41617
Publikováno v:
Química Nova, Vol 32, Iss 4, Pp 879-883 (2009)
The study consists is the application of zeolites NaX, NaY and A as builder in detergent formulations to eliminate the hardness of water. Therefore, the adsorption of ions Ca+2 and Mg+2 were evaluated, and the effect of the cleaning action of the sur
Externí odkaz:
https://doaj.org/article/5ead8682e76d465fb5884bd36dc15624
Publikováno v:
Química Nova, Vol 32, Iss 7, Pp 1818-1821 (2009)
Offretite T zeolite was synthesized using different source of Si (Ludox AS-30, Ludox LS-30 and Aerosil 200 Degussa). The obtained materials were characterized by different complementary techniques: XRD, textural analysis by N2 adsorption, IV, SEM and
Externí odkaz:
https://doaj.org/article/2b4735d51f2548ce9d97b7f23bca09ea
Publikováno v:
Materials Research, Vol 16, Iss 5, Pp 1122-1127 (2013)
Montmorillonite clays are of great interest for industrial processes such as catalysis and adsorption. The textural properties of clays can be modified in an attempt to increase their uses. This paper describes the acid treatment of natural montmoril
Externí odkaz:
https://doaj.org/article/ed8c708c4d8747428b985ee4b1aa3845
Autor:
Christian Wittee Lopes, Fábio G Penha, Renata Martins Braga, Dulce Maria de Araújo Melo, Sibele B. C Pergher, Diego Ivan Petkowicz
Publikováno v:
Química Nova, Vol 34, Iss 7, Pp 1152-1156 (2011)
The major applications of organoclays are in adsorption of organic polluents. The objective of this work was the synthesis and characterization of organoclays using differents amounts of cationic surfactant hexadecyltrimethylammonium bromide. The cla
Externí odkaz:
https://doaj.org/article/b32adfba48464bfb9d750712257c65da