Hydrogen production through CO2 reforming of methane over Ni/CeZrO2/Al2O3 catalysts

Faria, Estefânia Cardoso; Neto, Raimundo Crisostomo Rabelo; Simões, Rita de Cássia Colman; Noronha, Fábio B.

doi:10.1016/j.cattod.2013.10.058

Cited by 64 publications

(37 citation statements)

References 34 publications

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“…There is a clear decrease in crystallite size after addition of zirconium to CeO 2 for both supports and catalysts. This result agrees very well with previous studies on ceria and ceria-zirconiabased catalysts using bulk and supported oxides [30]. The addition of Zr 4?…”

Section: Catalyst Characterizationsupporting

confidence: 92%

“…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: 99%

“…The addition of zirconia to ceria increased the hydrogen consumption at low temperature region whereas the hydrogen uptake at high temperature region decreased. Ceria reduction is favored by the addition of zirconium, leading to an increase of oxygen vacancies [30]. The largest mobility of oxygen increases the reducibility of the cerium-zirconium mixed oxide.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

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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 Characterizationsupporting

confidence: 92%

Section: Catalyst Characterizationmentioning

confidence: 99%

Section: Catalyst Characterizationmentioning

confidence: 99%

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

et al. 2015

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“…However, much faster carbon deposition on nickel than on noble metals makes it very necessary to develop more cokeresistant Ni-based catalysts for industrial application [2]. Many previous studies have proved that for Ni-based catalysts, the nature of the support plays an important role to decrease the coking and increase the stability of the catalysts for DRM [3]. Our group has formerly studied Sn and Co modified Ni/Al 2 O 3 catalysts for methane reforming and found that both can promote the interaction between Ni and was ascribed to the formation of smaller Ni particles and more basic sites but with weaker basicity.…”

Section: Introductionmentioning

confidence: 99%

Methane dry reforming on Ni/La2Zr2O7 treated by plasma in different atmospheres

Peng

Liu

et al. 2015

Journal of Energy Chemistry

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“…In this study, the ability of dissociation of CH 4 and CO 2 was investigated over -Al 2 O 3 , La 2 O 3 , CeO 2 , and Ni on these oxide supports for evaluating the features of these materials. These supports are often used for the carbon dioxide reforming of methane, and especially, the addition of CeO 2 as a promoter has been reported to reduce the amount of deposited carbon [10][11][12][13][14][15][16]. In order to reveal the features of the effects of the support types on the activity and the amount of deposited carbon, H/D exchange reactions and dissociation reactions of CO 2 were carried out.…”

Section: Introductionmentioning

confidence: 99%