EAJ - Artigos publicados em periódicos
Permanent URI for this collectionhttps://repositorio.ufrn.br/handle/1/2966
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Article Study of High-Density Polyethylene (HDPE) kinetics modification treated by Dielectric Barrier Discharge (DBD) plasma(MDPI, 2020-10-21) Feitor, Michelle Cequeira; Medeiros Neto, João Freire de; Souza, Ivan Alves de; Targino, Talita Galvão; Diniz, Gutembergy Ferreira; Libório, Maxwell Santana; Sousa, Rômulo Ribeiro Magalhães; Costa, Thércio Henrique de CarvalhoArticle Optical-electrical properties and thickness analysis of TiO2 thin films obtained by magnetron sputtering(Springer Science and Business Media LLC, 2020-09-23) Feitor, Michelle Cerqueira; S. Sobrinho, V. S.; Miranda Neto, José Queiroz de; Lima, L. L. F.; Souza, Iedo A; Libório, Maxwell Santana; Queiroz, José César Augusto de; Sousa, Rômulo Ribeiro Magalhães de; Almeida, Érika Oliveira de; Costa, Thércio Henrique de CarvalhoArticle Structural and optical properties of ZnO: Al thin films produced by magnetron sputtering with different oxygen flow: an experimental and Ab initio study(Wiley, 2020-08-05) Feitor, Michelle Cerqueira; Queiroz, José César Augusto de; Azevedo Filho, João Batista de; Libório, Maxwell Santana; Santos, Edson José da Costa; Souto, Ulisses Borges; Sousa, Rômulo Ribeiro Magalhães de; Costa, Thércio Henrique de CarvalhoArticle Application of nitriding and duplex treatment on steel drills-HSS(JMEST, 2020-04) Feitor, Michelle Cequeira; Serra, Petteson Linniker Carvalho; Sousa, Rômulo Ribeiro Magalhães de; Barros Neto, João Rodrigues de; Libório, Maxwell Santana; Costa, Thércio Henrique de CarvalhoArticle Surface modification of PET fabric by plasma pre-treatment for long-lasting permethrin deposition(Wiley, 2020-05-18) Feitor, Michelle Cequeira; Badaro, Adair Divino da Silva; Libório, Maxwell Santana; Souza, Flaviane camara de; Sousa, Rômulo Ribeiro Magalhães; Santos, Rayane Saory Medeiros dos; Costa, Thércio Henrique de Carvalho; Naeem, Muhammad; Iqba, JavedArticle Synthesis and characterization of ZnO/ZnAl2O4/ Zn2TiO4 composite films by AreO2 mixture hollow cathode glow discharge(Elsevier, 2021) Feitor, Michelle Cequeira; Queiroz, José César Augusto de; Naeem, Muhammad; Azevedo Filho, João Batista; Libório, Maxwell Santana; Queiroz, M. G. O.; Sousa, R. R. M.; Melo, E. B.; Costa, Thércio Henrique de CarvalhoArticle The energetic characterization of pineapple crown leaves(Springer Nature, 2015-08-02) Melo, Marcus Antônio de Freitas; Braga, Renata Martins; Queiroga, T. S.; Calixto, Guilherme Quintela; Almeida, Hanna Nóbrega; Melo, Dulce Maria de Araújo; Freitas, Júlio César de Oliveira; Curbelo, Fabiola Dias da SilvaArticle Comparison of kinetic study of CTMA+ removal of molecular sieve Ti-MCM-41 synthesized with natural and commercial silica(ABM, ABC, ABPol, 2015) Melo, Marcus Antônio de Freitas; Fontes, Maria do Socorro Braga; Melo, Dulce Maria de Araújo; Costa, Cintia de Castro; Braga, Renata Martins; Alves, José Antônio Barros Leal ReisArticle Catalytic upgrading of Elephant grass (Pennisetum purpureum Schum) pyrolysis vapor using WO3 supported on RHA and RHA-MCM-41(Elsevier, 2017-01-01) Melo, Marcus Antônio de Freitas; Braga, Renata Martins; Melo, Dulce Maria de Araújo; Vitor Sobrinho, Eledir; Barros, Joana Maria de Farias; Carvalho, Alexandre Fontes Melo de; Fontes, Maria do Socorro Braga; Freitas, Júlio César de OliveiraArticle Efeito de diferentes fontes de sílica nos parâmetros texturais da peneira molecular MCM-41(Associação Brasileira de Cerâmica - ABCeram, 2016) Melo, Marcus Antônio de Freitas; Fontes, Maria S. B.; Melo, Dulce Maria de Araújo; Costa, Cíntia de Castro; Alves, J. A. B. L. R.; Silva, M. L. P.; Braga, Renata MartinsIn recent decades, research has been developed to achieve efficient and economically viable materials for application in various industry sectors. The mesoporous materials of MCM-41 family are among the effective candidates due to the facility of synthesis and structure that favors a range of applications. The aim of this study was to present a critical analysis of the characteristics and properties of mesoporous materials MCM-41 type, focusing on the structural aspects. In addition, the advantages and disadvantages of using commercial and alternative silica have been discussed. The commercial silica sources were TEOS and silica gel; the alternative silica sources were rice husk ash, quartz and glass powder. The analyzed materials were synthesized by hydrothermal method and characterized by XRD, FTIR, BET and TG. The results demonstrate the efficiency of alternative sources of silica in the synthesis of MCM-41, since the materials presented textural properties within the required standards. Therefore, they are able to be tested in the industry to replace the MCM-41 synthesized with commercial silica sourceArticle Nickel catalyst supported on magnesium and zinc aluminates (MgAl2 O4 and ZnAl2 O4 ) spinels for dry reforming of methane(Associação Brasileira de Cerâmica - ABCeram, 2017) Melo, Marcus Antônio de Freitas; Araújo, Larissa Costa Barros de; Melo, Dulce Maria de Araújo; Barros, J. M. de F.; Braga, Renata Martins; Costa, C. de C.; Rodrigues, G.Materiais, tais como MgAl2O4 e ZnAl2O4, avaliados em reações de reforma a seco de metano para produzir gás de síntese foram sintetizados pelo método de combustão assistida por micro-ondas usando ureia como combustível. As amostras dos óxidos sintetizados foram calcinadas a 800 °C durante 2 h e impregnadas com 5% de níquel. As amostras impregnadas foram calcinadas a 850 °C durante 4 h para se obter as fases desejadas. Os resultados dos testes catalíticos mostraram que os catalisadores são ativos para as reações de reforma a seco de metano, e o catalisador que mostrou o melhor desempenho para a capacidade de conversão de metano foi 5% de Ni/MgAl2 O4 calcinado a 850 °C/4hArticle Study of the reactivity by pulse of CH4 over NiO/Fe-doped MgAl2O4 oxygen carriers for hydrogen production(Elsevier, 2017-09-28) Melo, Marcus Antônio de Freitas; Medeiros, Rodolfo Luiz Bezerra de Araújo; Macedo, Heloísa Pimenta de; Figueredo, Gilvan Pereira de; Costa, Tiago Roberto da; Braga, Renata Martins; Melo, Dulce Maria de AraújoArticle Characterization and pyrolysis of Chlorella vulgaris and Arthrospira platensis: potential of bio-oil and chemical production by Py-GC/MS analysis(Springer Nature, 2017-04-17) Melo, Marcus Antônio de Freitas; Almeida, Hanna Nóbrega; Calixto, Guilherme Quintela; Chagas, Bruna M. E.; Melo, Dulce Maria de Araújo; Resende, Fabio M.; Braga, Renata MartinsArticle One-step synthesis of LaNiO3 with chitosan for dry reforming of methane(Elsevier, 2018-05-17) Melo, Marcus Antônio de Freitas; Oliveira, Ângelo Anderson Silva de; Medeiros, Rodolfo Luiz Bezerra de Araújo; Figueredo, Gilvan Pereira de; Macedo, Heloísa Pimenta de; Braga, Renata Martins; Maziviero, Fernando Velcic; Melo, Dulce Maria de Araújo; Vieira, Marcela MarquesArticle A comparative study of dry reforming of methane over nickel catalysts supported on perovskite-type LaAlO3 and commercial a-Al2O3(Elsevier, 2018-06-14) Melo, Marcus Antônio de Freitas; Figueredo, Gilvan Pereira de; Medeiros, Rodolfo Luiz Bezerra de Araújo; Macedo, Heloísa Pimenta de; Oliveira, Ângelo Anderson Silva de; Braga, Renata Martins; Mercury, José Manuel Rivas; Melo, Dulce Maria de AraújoArticle Study of the reactivity of Double-perovskite type oxide La1¡xMxNiO4 (M 1⁄4 Ca or Sr) for chemical looping hydrogen production(Elsevier, 2018-01-18) Melo, Marcus Antônio de Freitas; Melo, Vítor Rodrigo de Melo e; Medeiros, Rodolfo Luiz Bezerra de Araújo; Braga, Renata Martins; Macedo, Heloísa Pimenta de; Ruiz, Juan Alberto Chavez; Moure, Gustavo Torres; Melo, Dulce Maria de AraújoArticle Renewable aromatics through catalytic flash pyrolysis of pineapple crown leaves using HZSM-5 synthesized with RHA and diatomite(Elsevier, 2019-04-01) Melo, Marcus Antônio de Freitas; Barbosa, Andrey da Silva; Siqueira, Lorena A. M.; Medeiros, Rodolfo Luiz Bezerra de Araújo; Melo, Dulce Maria de Araújo; Freitas, Júlio César de Oliveira; Braga, Renata MartinsArticle One-pot microwave-assisted combustion synthesis of Ni-Al2O3 nanocatalysts for hydrogen production via dry reforming of methane(Elsevier, 2020-03-01) Melo, Marcus Antônio de Freitas; Medeiros, Rodolfo Luiz Bezerra de Araújo; Figueredo, Gilvan Pereira de; Macedo, Heloísa Pimenta de; Oliveira, Ângelo Anderson Silva de; Rabelo Neto, Raimundo C.; Melo, Dulce Maria de Araújo; Braga, Renata MartinsArticle Influence of porosity in a packed-bed tubular reactor on biodiesel production from soybean oil and supercritical ethanol: an experimental and phenomenological investigation(American Chemical Society, 2019-07-31) Souza, Domingos Fabiano de Santana; Santiago, Luiz E. P.; Rebouças, Érica G.; Silva, Maxwell G.; Oliveira, Katherine C.; Jesus, Anderson A.; Aguiar, Emerson Moreira de; Oliveira, Jackson A.Article Secagem da polpa de graviola pelo processo Foam-Mat e avaliação sensorial do produto obtido(UnP, 2015-08-10) Dieb, Judith Teixeira; Gurgel, Camilla Emanuelle Mendes Rocha; Dantas, Thayse Naianne Pires; Medeiros, Maria de Fátima Dantas deFoam mat drying tests of soursop pulp were conducted with addition of 1% neutral alloy and 1% emustab. Were studied the effects of temperature (50 ° C, 60 ° C and 70 ° C) and layer thickness (0.30 cm, 0.45 cm and 0.60 cm) at the drying kinetics, evaluating the behavior the drying curves and the physical - chemical cha-racteristics of the product powder (humidity and water activity). Yogurts were flavored with 7% soursop powder produced in the drying and sensory analysis was carried out using an evaluation test with 50 untrained panelists. Each taster issued notes to the attributes appearance, odor, flavor and texture. The product has higher acceptability rate to 70% and according to qualitative classification, the mean scores were between like slightly and enjoyed regularly (from 6.63 to 7.55 for odor and texture attributes, respectively)