Partial oxidation of methane using Pt/CeZrO2/Al2O3 catalysts – effect of preparation methods

Silva, Priscila P.; Silva, Fabiano A.; Souza, H.P. de; Lobo, A.G.; Mattos, Lisiane V.; Noronha, Fábio B.; Hori, Carla Eponina

doi:10.1016/j.cattod.2004.12.008

Cited by 44 publications

(29 citation statements)

References 40 publications

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“…For CeO 2 / Al 2 O 3 sample, it is also noticed the lines characteristic of CeO 2 with cubic structure (CeO 2 -PDF#34-0394). The addition of zirconia shifted these peaks to higher 2h values due to changes in lattice parameter and formation of a ceria-zirconia solid solution with cubic symmetry [27][28][29][30]. The diffraction lines related to zirconia phases were not detected.…”

Section: Catalyst Characterizationmentioning

confidence: 98%

Steam Reforming of Toluene Over Pt/Ce x Zr1−x O2/Al2O3 Catalysts

et al. 2015

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Steam reforming of toluene was investigated over Pt/Ce x Zr 1-x O 2 /Al 2 O 3 catalysts with different ceria and zirconia content (x = 0.25, 0.50, 0.75, and 1.00). Toluene was used as model molecule representative of tar produced in biomass gasification. The main reactions over Pt/Ce x Zr 1-x O 2 /Al 2 O 3 catalysts are the steam reforming of toluene and the water-gas shift. The dealkylation of toluene to benzene and methane takes place only at the beginning of the reaction. Toluene conversion significantly decreases during the reaction for all catalysts excepted for Pt/CeO 2 /Al 2 O 3 catalyst. Catalyst deactivation was attributed to carbon deposition as revealed by Raman spectroscopy. A clear relationship is observed between the acidity of the catalyst and the amount of carbon formed over Pt/Ce x Zr 1-x O 2 /Al 2 O 3 catalysts. Decreasing the Ce/Zr ratio increased the density of acid sites as well as the amount of carbon formed. This result suggests that the main route for carbon deposition proceeds by the oligomerization of toluene molecule on the acid sites of the support. Pt/CeO 2 /Al 2 O 3 catalyst was quite stable during steam reforming of toluene without carbon deposition. For this catalyst, ceria covered the acid sites of alumina and did not introduce significant Lewis acid sites.

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Section: Catalyst Characterizationmentioning

confidence: 98%

Steam Reforming of Toluene Over Pt/Ce x Zr1−x O2/Al2O3 Catalysts

et al. 2015

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“…Supported noble metals have promising high catalytic performances and low sensitivities to carbon deposition during the reforming process. In the literature it is found that the supported Pt [3][4][5][6], Rh [7,8] and Pd [9] catalysts are active and stable for this reaction. However, it is important, by the low availability and high cost, to develop active catalysts with very low noble metal content.…”

Section: Introductionmentioning

confidence: 98%

Role of CeO2 in Rh/α-Al2O3 Catalysts for CO2 Reforming of Methane

et al. 2011

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The Rh/a-Al 2 O 3 catalyst was modified by CeO 2 in order to improve the thermal stability and the carbon deposition resistance during the CO 2 reforming of methane The carbon formation was determined by TPO, TEM and Raman spectroscopy. Characterization results showed that the incorporation of Ce in the support inhibits the carbon deposition, increasing the useful life and the stability of the Rh base catalysts.

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“…CPO over various noble and base metals supported on Ce-ZrO2 has been examined by Salazar-Villalpando et al [81], Salazar-Villalpando and Miller [82] Salazar-Villalpando and Reyes [83], Larimi and Alavi [84], Silva et al [85], and Silva et al [86]. Investigations of ceria-zirconia supported catalyst in PO of hydrocarbon and oxygenated hydrocarbon are reviewed in the following sections.…”

Section: Catalytic Partial Oxidationmentioning

confidence: 99%

“…Similarly the activity of the catalyst was lower in comparison to Pt/CeO2/Al2O3. The effect of support preparation methods on the performance of the catalyst was further examined by Silva et al [86]. The supports were prepared with the PP and IMP methods, the latter providing higher surface coverage and resulting in higher stability and selectivity to hydrogen and carbon monoxide [86].…”

Section: Catalytic Partial Oxidation Of Methane (Cpom)mentioning

confidence: 99%

“…The effect of support preparation methods on the performance of the catalyst was further examined by Silva et al [86]. The supports were prepared with the PP and IMP methods, the latter providing higher surface coverage and resulting in higher stability and selectivity to hydrogen and carbon monoxide [86]. Under same conditions, addition of 1 wt% Ce to Al2O3, was shown by Silva et al [95] to improve the performance of a Pt/Ce0.75Zr0.25O2-Al2O3 catalyst, by improving Pt dispersion, OSC, and coverage of Al2O3 by oxides.…”

Section: Catalytic Partial Oxidation Of Methane (Cpom)mentioning

confidence: 99%

See 1 more Smart Citation

Hydrogen production from simple alkanes and oxygenated hydrocarbons over ceria–zirconia supported catalysts: Review

Nahar

Dupont

2014

Renewable and Sustainable Energy Reviews

102

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The use of ceria-zirconia based catalysts in hydrogen production from simple alkanes and oxygenated hydrocarbons for the processes of steam reforming (SR), autothermal reforming ('ATR'), catalytic partial oxidation ('CPO'), and dry reforming ('DR') are reviewed in this paper. Along with preparation methods, the effects of operating conditions like molar steam to carbon ratio, oxygen to carbon ratio, and temperature on the performance of hydrogen production from methane, acetic acid, ethanol, and glycerol were examined. SR and ATR of these feedstocks over ceria-zirconia supports have been widely investigated. In comparison the utilization of these supports in the CPO and DR processes has been investigated mainly for methane as compared to oxygenated hydrocarbons. Ce-rich supports were reported to be effective in hydrogen from SR and ATR of ethanol and glycerol and in SMR in the 'low' temperature range (500-600 °C), whereas zirconium-rich supports exhibited higher catalytic activity in the 'high' temperature range (700-800 °C). In the case of DR, Ce-rich supports were effective at high temperature. The methods of preparation of the supports/catalyst are shown to affect the surface area (catalyst/support), crystallite size of (active metal/support), reducibility and dispersion of the active metal, thus affecting performance of the catalyst.

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Partial oxidation of methane using Pt/CeZrO2/Al2O3 catalysts – effect of preparation methods

Cited by 44 publications

References 40 publications

Steam Reforming of Toluene Over Pt/Ce x Zr1−x O2/Al2O3 Catalysts

Steam Reforming of Toluene Over Pt/Ce x Zr1−x O2/Al2O3 Catalysts

Role of CeO2 in Rh/α-Al2O3 Catalysts for CO2 Reforming of Methane

Hydrogen production from simple alkanes and oxygenated hydrocarbons over ceria–zirconia supported catalysts: Review

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