2 research outputs found

    Characterization of RuO2–Rh2O3 supported on Ag1-xNbO3; at x=0, 0.1 and 0.5 for the H2 production

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    In this work, the characterization of the RuO2–Rh2O3 system supported on Ag1-xNbO3 (where x = 0, 0.1, and 0.5) prepared by the solid-state route at 900 °C for its employment as semiconductor in the production of hydrogen is presented. The physicochemical characterization evidences that the structural and electronic differences in the support were observed when the content of silver diminished by 50%. By X-ray diffraction of AgNbO3 stoichiometric ratio is confirmed, while the support, where there is a diminution of the silver content, evolved toward Ag2Nb2O11 mixed with the AgNbO3 with a band gap toward the visible region (2.5 eV). The results of scanning electron microscopy confirmed the presence of particles with sizes lower than 10 nm in both cases. Impregnation of the Ru–Rh bimetallic phase indicates that the amount of dispersed ruthenium compounds (RuO2, RuRh2O4 and RuNbO4) were greater than the nominal charge (1.40 > RuO2/Rh2O3 <2.83). The electrochemical evaluation revealed a performance of 2.5-times greater for the 5%RuO2-3% Rh2O3/Ag0.5NbO3 with respect to its homologue: 5%RuO2-3% Rh2O3/AgNbO3. © 2019 Elsevier LtdConsejo Nacional de Ciencia y Tecnología, Copenhagen Graduate School for Nanoscience and Nanotechnology. The authors are grateful to the Materials Construction Laboratory of FIC-UANL for the facilities lent in the development of these materials and M.C. Viridiana Maturano Rojas from ICAT-UNAM for TEM analysis. CARR thanks CONACYT for the support granted through Masters-degree scholarship, a mixed scholarship, and the Nanoscience and Nanotechnology Network from CONACYT

    Produção de gás de alimentos incubados in vitro com líquido ruminal de bovinos com diferente consumo residual de alimento

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    The objective of this study was to determine the in vitro gas production (PGIV) of two diets with contrasting proportions of concentrate (C) and forage (F) (80C:20F and 80F:20C), incubated with rumen fluid from animals with high or low Residual Feed Intake (RFI). From the PGIV, the in vitro digestibility of organic matter (DIVMO) and the metabolizable energy content (ME) were calculated. Four animals with high RFI and 4 cattle with low RFI were selected from the results obtained from a feeding trial of 68 animals for 77 days, using the Grow Safe© system. Rumen fluid extracted from each of these animals was used as inoculum to incubate the two diets in 100 mL graduated glass syringes (n=3). The PGIV, IVMOD and ME variables were higher (P &lt; 0.05) in the diets with high concentrate content; however, no significant differences (P &gt; 0.05) were recorded in these variables due to the classification of the animals in High RFI or Low RFI. It is concluded that the digestibility of the diets is similar between bovines with contrasting RFI.El propósito de esta investigación fue determinar la producción de gas in vitro (PGIV) de dos dietas con proporciones contrastantes de concentrado (C) y forraje (F) (80C:20F y 80F:20C), incubados con líquido ruminal proveniente de animales con alto o bajo Consumo Residual de Alimento (RFI). &nbsp;A partir de la PGIV se calculó la digestibilidad in vitrode la materia orgánica (DIVMO) y el contenido de energía metabolizable (EM). Se seleccionaron 4 bovinos con RFI alto y 4 bovinos con RFI bajo a partir de los resultados obtenidos de una prueba de alimentación de 68 bovinos durante 77 días, utilizando el sistema Grow Safe©. Líquido ruminal extraído de cada uno de estos animales, fue utilizado como inóculo para incubar las dos dietas en jeringas de vidro (n=3) graduadas de 100 mL. Las variables PGIV, DIVMO y EM fueron mayores (P &lt; 0.05) en las dietas con alto contenido de concentrado; sin embargo, no se registraron diferencias significativas (P &gt; 0.05) en esas varibles debidas a la clasificación de los animales en RFI Alto o RFI Bajo. Se concluye que &nbsp;la digestibilidad de las dietas es similar entre bovinos con RFI contrastante.O objetivo deste estudo foi determinar a produção de gás in vitro (PGIV) de duas dietas com proporções contrastantes de concentrado (C) e forragem (F) (80C:20F e 80F:20C), incubadas com fluido de rúmen de animais com alta ou baixa ingestão de ração residual (RFI). A partir do PGIV, a digestibilidade in vitro da matéria orgânica (DIVMO) e o conteúdo de energia metabolizável (ME) foram calculados. Quatro animais com alta RFI e 4 bovinos com baixa RFI foram selecionados a partir dos resultados obtidos de um teste de alimentação de 68 animais por 77 dias, usando o sistema Grow Safe©. O fluido de Rumen extraído de cada um desses animais foi usado como inóculo para incubar as duas dietas em seringas de vidro graduadas de 100 mL (n=3). As variáveis PGIV, IVMOD e ME foram maiores (P &lt; 0,05) nas dietas com alto teor de concentrado; no entanto, nenhuma diferença significativa (P &gt; 0,05) foi registrada nessas variáveis devido à classificação dos animais em Alta RFI ou Baixa RFI. Conclui-se que a digestibilidade das dietas é semelhante entre bovinos com RFI contrastante
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