16 documents found, page 1 of 2
Nanotubos de titanatos contendo metais de transição aplicados na condensação de...
Bessa, Bruno dos Santos; Oliveira, Alcineia Conceição; Mendes Filho, Josué; Viana Neto, Bartolomeu CruzA síntese e caracterização de nanotubos de titanatos intercalados com metais de transição (Al3+, Ni2+, Cr2+ e Co2+) foram investigadas. Os sólidos foram caracterizados quanto as suas propriedades físico-químicas por Microscopia eletrônica de varredura acoplada a EDS (MEV-EDS), difração de raios-X (DRX), espectroscopia Raman, isotermas de adsorção-dessorção de nitrogênio. A atividade catalítica dos sólidos na re...
Styrene oxidation to valuable compounds over nanosized FeCo-based catalysts: ef...
Oliveira, Ana Paula Saraiva; Gomes, Igor Santos; Oliveira, Alcineia Conceição; Mendes Filho, Josué; Saraiva, Gilberto Dantas; Soares, João MariaNanosized FeCo-based solids were prepared via distinct preparation procedures. The catalytic performances of the solids for styrene oxidation in the presence of hydrogen peroxide were evaluated. The addition of promoters in FeCo such as Sn, Mo, or Cu was also investigated. The catalysts were characterized with XRD, Raman spectroscopy, TEM, chemical analyses, EPR and SEM-EDS. Of these solids obtained via four di...
Nanosized Pt-containing Al2O3 as an efficient catalyst to avoid coking and sint...
Carvalho, Davi Coelho de; Sousa, Helvio Silvester Andrade de; Mendes Filho, Josué; Assaf, Elisabete Moreira; Thyssen, Vivian VazquezThe action of nanosized Pt-containing Al2O3 catalysts to avoid coking and sintering was studied in steam reforming of glycerol. The solids exhibited almost 100% conversion toward syngas produced at a suitable water to glycerol ratio. Depending on the promoter, a drastic drop in hydrogen yield was observed due to coking and sintering effects. Spent catalyst characterizations by Raman, HRTEM, XRD, TG and SEMEDS a...
Porous ternary Fe-based catalysts for the oxidative dehydrogenation of ethylben...
Ferreira, Nuryana Alves; Mendes Filho, Josué; Oliveira, Alcineia ConceiçãoPorous ternary Fe-based catalysts were characterized and their catalytic properties through the oxidative dehydrogenation of ethylbenzene in the presence (ODH) or absence (DH) of carbon dioxide were investigated. The catalysts were characterized by X-ray diffraction (XRD), chemical analyses, thermoprogrammed reduction (TPR), physisorption measurements, Raman spectroscopy and scanning electron microscopy coupled...
Binary oxides with defined hierarchy of pores in the esterification of glycerol
Alves, Nuryana Ferreira; Santiago Neto, Antonio de Brito; Bessa, Bruno dos Santos; Oliveira, Alcemira Conceição; Mendes Filho, JosuéVarious porous binary oxides with elevated textural properties were obtained in this work. The as-synthesized solids were calcined or modified by reflux and extraction processes. Characterizations through SEM, nitrogen physisorption and TEM techniques demonstrated the formation of porous metal oxide networks over all solids. XRD, thermal analyses and FTIR measurements showed the existence of nanosized rutile Ti...
Studies of catalytic activity and coke deactivation of spinel oxides during eth...
Freire, Rafael M.; Sousa, Francisco F. de; Pinheiro, Anderson L.; Longhinotti, Elisane; Mendes Filho, J.; Oliveira, Alcemira ConceiçãoTexto completo: acesso restrito. p. 165-179; Submitted by Suelen Reis (suziy.ellen@gmail.com) on 2013-10-11T12:08:24Z No. of bitstreams: 1 1-s2.0-S0926860X09001574-main.pdf: 834366 bytes, checksum: ff710893da1fa4171688240f210f8ac8 (MD5); Approved for entry into archive by Rodrigo Meirelles (rodrigomei@ufba.br) on 2013-11-18T21:18:58Z (GMT) No. of bitstreams: 1 1-s2.0-S0926860X09001574-main.pdf: 834366 bytes, ch...
Nanocasted oxides for gas phase glycerol conversion
Lima, Cleanio L.; Vasconcelos, Santiago J. S.; M. Filho, Josué; C. Neto, Bartolomeu; Rocha, Maria da Graça Martins Carneiro da; Bargiela, PascalAcesso restrito: Texto completo. p. 50-62.; Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2012-02-08T17:48:31Z No. of bitstreams: 1 C__Documents and Settings_rep...t.default_Cache_3_AF_B1197d01.pdf: 927260 bytes, checksum: cf086a47c06b34775ce376fde91ed939 (MD5); Made available in DSpace on 2012-02-08T17:48:31Z (GMT). No. of bitstreams: 1 C__Documents and Settings_rep...t.default_Cache_3_AF_B1197d...
Activity of nanocasted oxides for gas-phase dehydration of glycerol
Vasconcelos, Santiago J. S.; Lima, Cleanio L.; M. Filho, Josué; Oliveira, Alcemira Conceição; Barros, Eduardo B.; Sousa, Francisco F. deAcesso restrito: Texto completo. p. 656-664.; Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2012-03-02T11:49:52Z No. of bitstreams: 1 __pdn.sciencedirect.com_....0-S1385894711000805-main.pdf: 746952 bytes, checksum: 23a443da38e6c3b9983ab1fef9478224 (MD5); Made available in DSpace on 2012-03-02T11:49:52Z (GMT). No. of bitstreams: 1 __pdn.sciencedirect.com_....0-S1385894711000805-main.pdf: 746952 b...
Analysis of coke deposition and study of the structural features of MAl2O4 cata...
Pinheiro, Anderson L.; Pinheiro, Antonio N.; Valentini, Antoninho; Mendes Filho, J.; Sousa, Francisco F. de; Sousa, Jackson R. deTrabalho completo: acesso restrito, p.11–14; Submitted by Bruna Lessa (lessbruna@gmail.com) on 2012-06-29T17:04:24Z No. of bitstreams: 2 (89)1-s2.0-S1566736709002994-main.pdf: 267868 bytes, checksum: bd0c14db99d6a046d02d8c340732b51b (MD5) (89)1-s2.0-S1566736709002994-main.pdf: 267868 bytes, checksum: bd0c14db99d6a046d02d8c340732b51b (MD5); Made available in DSpace on 2012-06-29T17:04:24Z (GMT). No. of bitstream...
Acid and Superacid Solids for the Transformation of n-Butane
Oliveira, Alcineia Conceição; Essayem, Nadine; Tuel, Alain; Clacens, Jean-Marc; Taârit, Younes Ben; Oliveira, Alcineia Conceição; Essayem, NadineRESTRITO; Submitted by Santiago Fabio (fabio.ssantiago@hotmail.com) on 2012-07-10T15:03:36Z No. of bitstreams: 1 EE.pdf: 55781 bytes, checksum: a5845e6ef63ea7a99bdc53e2d2d2f81f (MD5); Made available in DSpace on 2012-07-10T15:03:36Z (GMT). No. of bitstreams: 1 EE.pdf: 55781 bytes, checksum: a5845e6ef63ea7a99bdc53e2d2d2f81f (MD5) Previous issue date: 2006; Acid and superacid solids were evaluated in n-butane iso...