Perovskite LaxM1−xNi0.8Fe0.2O3 catalyst for steam reforming of toluene: Crucial role of alkaline earth metal at low steam condition

Oemar, Usman; Ang, Ming Li; Hee, W.F.; Hidajat, K.; Kawi, Sibudjing

doi:10.1016/j.apcatb.2013.10.001

Cited by 136 publications

(57 citation statements)

References 71 publications

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“…In this sense, we have reported in previous papers the promoter effect of ceria in activated carbon-supported Pt catalysts, where the interaction between the metal and the oxide is enhanced [7]. Another challenge in the developing of a WGS catalyst is the replacement of platinum by a more economical metal.In this sense, nickel has been the metal of choice for certain reforming reactions due to its competitive price, high availability and activity [8,9], and it has proved to be active and selective in the WGS reaction when it is highly dispersed [10,11].…”

Section: Introductionmentioning

confidence: 99%

Promoter effect of sodium in graphene-supported Ni and Ni–CeO2 catalyst for the low-temperature WGS reaction

Dongil

Pastor‐Pérez

Sepúlveda-Escribano

et al. 2015

Applied Catalysis A: General

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Graphical abstract Highlights-Graphene-supported Ni and Ni-CeO 2 catalysts have been studied.-Metal dispersion depends on the presence of ceria and on the precipitating agent, NaOH or urea.-The graphene support strongly interacts with the ceria promoter.-The presence of sodium increases the catalytic activity, mainly in the presence of ceria. AbstractThe low temperature water-gas shift (WGS) reaction has been studied over NiCeO 2 /Graphene and Ni/Graphene. The catalysts were prepared with 5 wt% Ni and 20 wt% CeO 2 loadings, by deposition-precipitation employing sodium hydroxide and urea as precipitating agents. The materials were characterized by TEM, powder X-ray diffraction, Raman spectroscopy, H 2 -temperature-programmed reduction and X-ray photoelectron spectroscopy (XPS). The characterization and the reaction results indicated that the interaction between the active species and the support is higher than with activated carbon, and this hinders the reducibility of ceria and thus the catalytic performance. On the other hand, the presence of residual sodium in samples prepared by precipitation with NaOH facilitated the reduction of ceria. The catalytic activity was highly improved in the presence of sodium, what can be explained on the basis of an associative reaction mechanism which is favored over Ni-O-Na entities.

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Section: Introductionmentioning

confidence: 99%

Promoter effect of sodium in graphene-supported Ni and Ni–CeO2 catalyst for the low-temperature WGS reaction

Dongil

Pastor‐Pérez

Sepúlveda-Escribano

et al. 2015

Applied Catalysis A: General

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“…Catalysts with basic properties tend to decrease the rate of coke formation in many reforming reactions, such as steam reforming of toluene [18,30], CO 2 reforming of methane [35][36][37], steam reforming of methane [37], steam reforming of ethanol [38,39], which in turn leads to reduced catalyst deactivation over time and helps to increase the stability of the catalyst. Furthermore, calcium oxide (CaO) is widely known to be a CO 2 sorbent, assisting the production of hydrogen-rich gas [40,41] in biomass gasification for hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

Steam reforming of biomass tar model compound at relatively low steam-to-carbon condition over CaO-doped nickel–iron alloy supported over iron–alumina catalysts

Ashok

Kawi

2015

Applied Catalysis A: General

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“…The formation of carbon is reduced or inhibited on smaller Ni crystallite size [18,19] by controlling the number of atoms in an ensemble. Mixed oxides such as perovskite-or hydrotalcites-type oxides have been reported as promising catalyst precursors for SR of toluene [10][11][12][13][14][15][16]. The reduction of these mixed oxides result in thermally stable and highly dispersed metallic particles.…”

Section: Introductionmentioning

confidence: 99%

“…However, due to the complexity of tar composition, different model molecules representatives of tar have been used in the studies such as benzene, toluene, naphthalene and methylnaphthalene. Nickel-based catalysts have been extensively investigated for the steam reforming (SR) of toluene due to the high activity of Ni for C-C bond breaking and its low cost [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. However, nickel catalysts undergo significant deactivation during steam reforming of toluene, mainly attributed to carbon deposition.…”

Section: Introductionmentioning

confidence: 99%

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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Perovskite LaxM1−xNi0.8Fe0.2O3 catalyst for steam reforming of toluene: Crucial role of alkaline earth metal at low steam condition

Cited by 136 publications

References 71 publications

Promoter effect of sodium in graphene-supported Ni and Ni–CeO2 catalyst for the low-temperature WGS reaction

Promoter effect of sodium in graphene-supported Ni and Ni–CeO2 catalyst for the low-temperature WGS reaction

Steam reforming of biomass tar model compound at relatively low steam-to-carbon condition over CaO-doped nickel–iron alloy supported over iron–alumina catalysts

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

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