Reforming
Mostrando 13-24 de 142 artigos, teses e dissertações.
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13. Nickel-based Catalyst Precursor Prepared Via Microwave-induced Combustion Method: Thermodynamics of Synthesis and Performance in Dry Reforming of CH4
Nickel-based catalyst precursor for dry reforming of methane was successfully prepared by a self-combustion method. Three different amino acids: urea, glycine and citric acid were tested as fuels in the redox reaction with metal nitrates. For each fuel, a thermodynamic modeling of the combustion reaction was performed. The samples were characterized by X-ray
Mat. Res.. Publicado em: 25/08/2015
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14. METHANE DRY REFORMING OVER Ni SUPPORTED ON PINE SAWDUST ACTIVATED CARBON: EFFECTS OF SUPPORT SURFACE PROPERTIES AND METAL LOADING
The influence of metal loading and support surface functional groups (SFG) on methane dry reforming (MDR) over Ni catalysts supported on pine-sawdust derived activated carbon were studied. Using pine sawdust as the catalyst support precursor, the smallest variety and lowest concentration of SFG led to best Ni dispersion and highest catalytic activity, which
Quím. Nova. Publicado em: 2015-05
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15. SYNGAS PRODUCTION FROM CO2-REFORMING OF CH4 OVER SOL-GEL SYNTHESIZED Ni-Co/Al2O3-MgO-ZrO2 NANOCATALYST: EFFECT OF ZrO2 PRECURSOR ON CATALYST PROPERTIES AND PERFORMANCE
Ni-Co/Al2O3-MgO-ZrO2 nanocatalyst with utilization of two different zirconia precursors, namely, zirconyl nitrate hydrate (ZNH) and zirconyl nitrate solution (ZNS), was synthesized via the sol-gel method. The physiochemical properties of nanocatalysts were characterized by XRD, FESEM, EDX, BET and FTIR analyses and employed for syngas production from CO2-ref
Quím. Nova. Publicado em: 2015-05
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16. EVALUATING HYDROGEN PRODUCTION IN BIOGAS REFORMING IN A MEMBRANE REACTOR
Abstract Syngas and hydrogen production by methane reforming of a biogas (CH4/CO2 = 2.85) using carbon dioxide was evaluated in a fixed bed reactor with a Pd-Ag membrane in the presence of a nickel catalyst (Ni 3.31% weight)/γ-Al2O3) at 773 K, 823 K, and 873 K and 1.01×105 Pa. Operation with hydrogen permeation at 873 K increased the methane conversion to
Braz. J. Chem. Eng.. Publicado em: 2015-03
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17. A ROBUST COMBINATORIAL APPROACH BASED ON P-GRAPH FOR SUPERSTRUCTURE GENERATION IN DOWNSTREAM BIOPROCESSES
Abstract In the production of chemicals from fermentation, the cost of downstream purification constitutes the major portion of the total production cost. Since the bioprocess generally contains a large amount of biochemical separation units, its flowsheets are complex. How to generate the rigorous superstructure of the downstream bioprocess is a primary pro
Braz. J. Chem. Eng.. Publicado em: 2015-03
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18. Cu and Ni Catalysts Supported on γ-Al2O3 and SiO2 Assessed in Glycerol Steam Reforming Reaction
Catalisadores de Cu e Ni suportados em γ-Al2O3 e SiO2 comerciais foram estudados frente a reforma a vapor de glicerol. Os catalisadores foram preparados pelo método da impregnação e caracterizados por espectrometria de emissão atômica por plasma acoplado indutivamente, fisissorção de nitr
J. Braz. Chem. Soc.. Publicado em: 2015-01
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19. Ni/La2O3-SiO2catalysts applied to glycerol steam reforming reaction: effect of the preparation method and reaction temperature
Catalisadores Ni/La2O3-SiO2 foram preparados por diferentes métodos: impregnação sequencial, impregnação simultânea (I-sim), precipitação do suporte seguida da impregnação do metal e co-precipitação. As amostras foram caracterizadas por espectroscopia de energia dispersiva de raios X, fisissorção de nitrogênio, difração de raios X (XRD), esp
J. Braz. Chem. Soc.. Publicado em: 2014-12
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20. Nickel / Doped Ceria Solid Oxide Fuel Cell Anodes for Dry Reforming of Methane
Neste trabalho, foi estudado o desempenho catalítico de materiais a base de Ni, suportado em cério dopado com Zr, Pr e Nb para serem usados como anodos em células a combustível de óxido sólido (SOFC) alimentadas com combustíveis contendo metano e CO2. Os anodos foram preparados pelo método hidrotérmico, usando um teor de Ni (14% em volume) menor do
J. Braz. Chem. Soc.. Publicado em: 2014-12
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21. Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts
M-Co-Al (M = Ca, La, Li or Mg) materials were synthesised by co-precipitation and investigated for dry reforming of methane. Thermogravimetry, temperature-programmed oxidation, reduction and CO2 desorption, specific area and X-ray diffraction were utilised for characterisation. Activity tests were conducted at atmospheric pressure, temperatures between 400-5
Mat. Res.. Publicado em: 28/07/2014
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22. Advances in ethanol reforming for the production of hydrogen
Catalytic steam reforming of ethanol (SRE) is a promising route for the production of renewable hydrogen (H2). This article reviews the influence of doping supported-catalysts used in SRE on the conversion of ethanol, selectivity for H2, and stability during long reaction periods. In addition, promising new technologies such as membrane reactors and electroc
Quím. Nova. Publicado em: 2014-06
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23. Remoção do alcatrão de correntes de gaseificação de biomassa: processos e catalisadores
Biomass gasification is a technology that has attracted great interest in synthesis of biofuels and oxo alcohols. However, this gas contains several contaminants, including tar, which need to be removed. Removal of tar is particularly critical because it can lead to operational problems. This review discusses the major pathways to remove tar, with a particul
Quím. Nova. Publicado em: 2014
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24. Estudo de catalisadores de níquel suportados em cinza de casca de arroz na reforma de metano com dióxido de carbono visando a produção de hidrogênio e gás de síntese
Rice husk ash (RHA) is used as a silica source for several purposes, among them to obtain metal catalysts, as was done in this work. The catalysts were characterized by chemisorption, physisorption, thermal analyses (TG, DSC), X-ray diffraction, X-ray fluorescence, temperature-programmed reduction and scanning electron microscopy. The catalysts synthesized w
Quím. Nova. Publicado em: 2014