The effect of the addition of Y2O3 to Ni/α-Al2O3 catalysts on the autothermal reforming of methane

Santos, Danielle C.R.M.; Madeira, Laureanny; Passos, Fábio B.

doi:10.1016/j.cattod.2009.06.015

Cited by 49 publications

(18 citation statements)

References 27 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%

“…ATR can be carried out over a wide range of the H 2 /CO ratio by manipulating the relative inlet concentrations of steam and oxygen (Souza e Schmal, 2005;Santos et al, 2010;Liu et al, 2000;Liu et al, 2002). According to Takeguchi et al (2003), ATR is an adiabatic, i.e., thermally self-sustaining (Halabi, et al, 2008.;Chang et al, 2010;Hagh, 2004;Rabe et al, 2007, reforming process. In the calculations done in this work, ATR means strict adiabatic condition, which is also identified here as thermoneutral condition.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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: Introductionmentioning

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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“…Table 1 shows the cyclohexane dehydrogenation rates (R) of the powder prepared samples. These data are directly proportional to the amount of metallic Pd on the catalytic surface [22]. As the reduction occurs at very low temperature (260 • C), it can be suggested that the amount of Pd on the surface does not change when the catalysts are oxidized.…”

Section: Catalystsmentioning

confidence: 98%

“…Cyclohexane dehydrogenation rates of the prepared catalysts (powder) were employed as an indirect measurement of the Pd metallic surface area [22]. This reaction was carried out at atmospheric pressure using a conventional fixed-bed micro reactor monitored by on-line gas chromatography.…”

Section: Characterizationmentioning

confidence: 99%

The role of m-ZrO2 in the selective oxidation of ethanol to acetic acid employing PdO/m-ZrO2

Letichevsky

Zonetti

Reis

et al. 2015

Journal of Molecular Catalysis A: Chemical

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“…In particular, the chemical composition of a support can affect the size, morphology, and electronic and redox properties of the supported metal containing particles and, correspond ingly, their catalytic properties [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. In this context, the regulation of these parameters by the introduction of modifiers into an oxide support is considered.…”

Section: Effect Of Support Modification On the Physicochemical Propermentioning

confidence: 99%

Effect of support modification on the physicochemical properties of a NiPd/Al2O3 catalyst for the autothermal reforming of methane

et al. 2015

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For the development of effective catalysts for the autothermal reforming of methane, the NiPd catalysts were synthesized based on modified aluminum oxide and their physicochemical properties were studied using X ray diffraction analysis, low temperature nitrogen adsorption, transmission electron micros copy, and temperature programmed reduction with hydrogen. It was found that the variation of modifying components (CeO 2 , ZrO 2 , La 2 O 3 , Ce 0.5 Zr 0.5 O 2 , and La 2 O 3 /Ce 0.5 Zr 0.5 O 2 ) and their concentrations (10-30 wt %) makes it possible to regulate the particle size of NiO, the composition of a Ni containing phase (NiO, La 2 NiO 4 , NiAl 2 O 4 , or Ni-La-Al-O) and the redox properties of nickel ions. It was shown that the average particle size of NiO increased from 6.7 to 17.5 nm in the following order of supports: . On the introduction of the modifying oxides CeO 2 and ZrO 2 into aluminum oxide, the fraction of nickel in the composition of NiAl 2 O 4 decreased and, therefore, the fraction of difficult to reduce Ni 2+ decreased. The addition of La 2 O 3 and La 2 O 3 /Ce 0.5 Zr 0.5 O 2 strengthened the interaction of nickel cations with the support up to the formation of Ni-La-Al-O and La 2 NiO 4 phases and increased the fraction of difficult to reduce Ni 2+ ions. The resulting NiPd catalysts are promising in the catalysis of the autothermal reforming of methane.

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The effect of the addition of Y2O3 to Ni/α-Al2O3 catalysts on the autothermal reforming of methane

Cited by 49 publications

References 27 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

The role of m-ZrO2 in the selective oxidation of ethanol to acetic acid employing PdO/m-ZrO2

Effect of support modification on the physicochemical properties of a NiPd/Al2O3 catalyst for the autothermal reforming of methane

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