Methane autothermal reforming on nickel–ceria–zirconia based catalysts

Escritori, Janaína C.; Dantas, Sandra Cristina; Soares, Ricardo R.; Hori, Carla Eponina

doi:10.1016/j.catcom.2009.01.001

Cited by 59 publications

(33 citation statements)

References 17 publications

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“…The range for the inlet temperature was from 400 to 1000 °C, and for the pressure from 1 to 50 bar. This window of conditions was defined in consideration of previous experimental and theoretical works on methane ATR (Halabi et al, 2008;Chang et al, 2010;Akbari et al, 2011;Dias e Assaf, 2004;Santos et al, 2010;Chen et al, 2010;Li et al, 2008;Reese et al, 2010;Simeone et al, 2008;Ayabe et al, 2003;Escritori et al, 2009;Souza et al, 2010;Hoang et al, 2006;Dantas et al, 2010), except for the O/M ratio. A higher O/M ratio, in fact, implies a higher equilibrium temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Coke is an undesirable reaction product in catalytic reforming, since the solid carbon can lead to the catalyst deactivation (Souza e Schamal, 2005;Halabi et al, 2008;Escritori et al, 2009;Ruiz et al, 2008;Adhikari et al, 2007).The carbon formation is examined in Fig. 3 which shows the C/M ratio (moles of carbon at equilibrium / moles of methane at inlet stream) as a function of the O/M and S/M ratios, at several inlet temperatures and pressures.…”

Section: Coke Formationmentioning

confidence: 99%

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Thermodynamic Analysis of Autothermal Reforming of Methane via Entropy Maximization: Hydrogen Production

Souza¹,

Rossi²,

Alonso³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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-In this work a thermodynamic analysis of the autothermal reforming (ATR) of methane was performed. Equilibrium calculations employing entropy maximization were performed in a wide range of oxygen to methane mole ratio (O/M), steam to methane ratio (S/M), inlet temperature (IT), and system pressure (P). The main calculated parameters were hydrogen yield, carbon monoxide formation, methane conversion, coke formation, and equilibrium temperature. Further, the optimum operating oxygen to methane feed ratio that maximizes hydrogen production, at P=1 bar, has been calculated. The nonlinear programming problem applied to the simultaneous chemical and phase equilibrium calculation was implemented in GAMS ® , using CONOPT2 solver. The maximum amount of hydrogen obtained was in the order of 3 moles of hydrogen per mole of fed methane at IT=1000 °C, P=1 bar, S/M=5, and O/M=0.18.

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Section: Resultsmentioning

confidence: 99%

Section: Coke Formationmentioning

confidence: 99%

Thermodynamic Analysis of Autothermal Reforming of Methane via Entropy Maximization: Hydrogen Production

Souza¹,

Rossi²,

Alonso³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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“…The increase of a portion of difficultly reduced Ni 2+ species, as well as the increase of T 1 value corresponding to the weak interaction of Ni 2+ species with support, are found for Ni/SiO 2 /Ce 0.5 Zr 0.5 O 2 -3 catalyst, that are expected to have detrimental effect on its activity in the ATR of CH 4 . It was shown that the increase of both the reducibility of NiO and the Ni o surface dispersion resulted in a rise of CH 4 conversion [79,80,82]. Conversely, it was also concluded that NiO dispersed without strong interaction with the support had a high performance in methane partial oxidation, while in case of NiO dispersed with strong interaction between it and the support the catalyst had a high stability in autothermal reforming in the upper temperature range [83].…”

Section: Catalytic Testsmentioning

confidence: 99%

Application of POSS Nanotechnology for Preparation of Efficient Ni Catalysts for Hydrogen Production

Исмагилов

Матус

Kuznetsov

et al. 2017

Eurasian Chem. Tech. J.

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POSS (polyhedral oligomeric silsesquioxanes) nanotechnology was applied for preparation of efficient Ni catalysts for hydrogen production through autothermal reforming of methane (ATR of CH 4 ). The novel metal-POSS precursor [Nickel (II) -HeptaisobutylPOSS (C 4 H 9 ) 7 Si 7 O 9 (OH)O 2 Ni] of Ni nanoparticles was introduced into Ce 0.5 Zr 0.5 O 2 support with following calcination and reduction stages of activation. The peculiarity of the genesis of Ni/SiO 2 /Ce 0.5 Zr 0.5 O 2 nanomaterials and their characteristics versus deposition mode were studied by X-ray fluorescence spectroscopy, thermal analysis, N 2 adsorption, X-ray diffraction, high-resolution transmission electron microscopy and H 2 temperature-programmed reduction. The two kinds of supported Ni-containing particles were observed: highly dispersed Ni forms (1-2 nm) and large Ni-containing particles (up to 50-100 nm in size). It was demonstrated that the textural, structural, red-ox and, consequently, catalytic properties of ex-Ni-POSS catalysts depend on the deposition mode. The increase of a portion of difficultly reduced Ni 2+ species is found upon application of intermediate calcination during Ni-POSS deposition that has detrimental effect on the activity of catalyst in ATR of CH 4 . The Ni/SiO 2 /Ce 0.5 Zr 0.5 O 2 catalyst prepared by one-step Ni-POSS deposition exhibits the highest H 2 yield -80% at T = 800 °C.

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“…[12] The enhancement of the catalytic activity caused by the presence of CeO 2 is due to an increase in the dispersion of the metals on the support, the prevention of thermal sintering, [13][14][15] and the remarkable oxygen-storage capability of this material, that is, its ability to undergo rapid redox cycles by releasing and storing oxygen. [16][17][18] In addition to the use of modifiers, heat treatments have also been extensively applied to the catalysts to improve their activity. [19,20] Oxidation treatments resulting in the formation of RuO x have attracted a great deal of attention.…”

Section: Introductionmentioning

confidence: 99%

Activity–Structure Correlation of Pt/Ru Catalysts for the Electrodecomposition of Methanol: The Importance of RuO₂and PtRu Alloying

Wei¹,

Liu²,

Wang³

2009

ChemPhysChem

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Bimetallic catalysts: The effect of PtRu alloying and the influence of RuO(2) species on the methanol oxidation activity of PtRu/C catalysts is studied. Different heat treatments-utilizing either N(2) or air-are applied to the bimetallic materials to enhance the degree of alloying or produce RuO(2) [picture: see text]. The catalysts with the best performance are characterized by a small particle size, a high degree of PtRu alloying, and the presence of a Pt-related species on their surface.Herein, we study the effect of both PtRu alloying and the presence of RuO(2) species on the promotion of the methanol oxidation activity of PtRu/C catalysts. Bimetallic catalysts composed of 15 wt % PtRu/Ce(x)C (x=0 or 10) are prepared by using the precipitation-deposition method and activated through hydrogen reduction at 470 K. Different heat treatments, utilizing either N(2) or air, are applied to the as-prepared catalysts to enhance the degree of alloying or produce RuO(2), respectively. The electrocatalytic properties, the structure, and the surface composition of the alloys are investigated systematically by means of electrochemical measurements coupled with X-ray diffraction (XRD) and temperature-programmed reduction (TPR) experiments. We find that the N(2) heat treatment improves the catalytic activity of the alloys more significantly than the air heat treatment. Also, the current density and long-term durability toward methanol oxidation can be significantly enhanced by combining a loading of 10 % CeO(2) and N(2) with a heat treatment at 570 K. Physical characterization performed by means of TPR reveals that the surface of the N(2)-treated sample is covered with Pt, thereby presenting a higher methanol oxidation current than the air-treated sample whose surface is composed of RuO(2) and some alloy species. Moreover, a model for describing the physical structures of the deposited bimetallic crystallites obtained after the N(2) and air treatments is proposed. This model suggests that the catalysts with the best performance should have a small particle size and exhibit a structure characterized by a high degree of PtRu alloying and a Pt-related surface species. Therefore, we can conclude that the effect of PtRu alloying on the electro-oxidation activity of the catalysts is superior to that of the presence of RuO(2) species under practical conditions.

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Methane autothermal reforming on nickel–ceria–zirconia based catalysts

Cited by 59 publications

References 17 publications

Thermodynamic Analysis of Autothermal Reforming of Methane via Entropy Maximization: Hydrogen Production

Thermodynamic Analysis of Autothermal Reforming of Methane via Entropy Maximization: Hydrogen Production

Application of POSS Nanotechnology for Preparation of Efficient Ni Catalysts for Hydrogen Production

Activity–Structure Correlation of Pt/Ru Catalysts for the Electrodecomposition of Methanol: The Importance of RuO₂and PtRu Alloying

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Methane autothermal reforming on nickel–ceria–zirconia based catalysts

Cited by 59 publications

References 17 publications

Thermodynamic Analysis of Autothermal Reforming of Methane via Entropy Maximization: Hydrogen Production

Thermodynamic Analysis of Autothermal Reforming of Methane via Entropy Maximization: Hydrogen Production

Application of POSS Nanotechnology for Preparation of Efficient Ni Catalysts for Hydrogen Production

Activity–Structure Correlation of Pt/Ru Catalysts for the Electrodecomposition of Methanol: The Importance of RuO2and PtRu Alloying

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Product

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Activity–Structure Correlation of Pt/Ru Catalysts for the Electrodecomposition of Methanol: The Importance of RuO₂and PtRu Alloying