Effect of Au doping of Ni/Al2O3 catalysts used in steam reforming of methane: Mechanism, apparent activation energy, and compensation effect

Rocha, Kleper de Oliveira; Marques, C.M.P.; Bueno, J.M.C.

doi:10.1016/j.ces.2019.06.049

Cited by 26 publications

(12 citation statements)

References 56 publications

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“…The future trend in hydrogen production is increasing toward Fe < Co < Ni for both fractions. Many researchers cite the oxygen storage/reduction of cerium-based materials and nanocrystals’ catalytic activity on the supports’ surface as a key component of the WGS and methane reforming activity of catalysts [ 67 , 69 , 73 , 74 , 75 ].…”

Section: Resultsmentioning

confidence: 99%

Catalytic Conversion of n-C7 Asphaltenes and Resins II into Hydrogen Using CeO2-Based Nanocatalysts

et al. 2021

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This study focuses on evaluating the volumetric hydrogen content in the gaseous mixture released from the steam catalytic gasification of n-C7 asphaltenes and resins II at low temperatures (<230 °C). For this purpose, four nanocatalysts were selected: CeO2, CeO2 functionalized with Ni-Pd, Fe-Pd, and Co-Pd. The catalytic capacity was measured by non-isothermal (from 100 to 600 °C) and isothermal (220 °C) thermogravimetric analyses. The samples show the main decomposition peak between 200 and 230 °C for bi-elemental nanocatalysts and 300 °C for the CeO2 support, leading to reductions up to 50% in comparison with the samples in the absence of nanoparticles. At 220 °C, the conversion of both fractions increases in the order CeO2 < Fe-Pd < Co-Pd < Ni-Pd. Hydrogen release was quantified for the isothermal tests. The hydrogen production agrees with each material’s catalytic activity for decomposing both fractions at the evaluated conditions. CeNi1Pd1 showed the highest performance among the other three samples and led to the highest hydrogen production in the effluent gas with values of ~44 vol%. When the samples were heated at higher temperatures (i.e., 230 °C), H2 production increased up to 55 vol% during catalyzed n-C7 asphaltene and resin conversion, indicating an increase of up to 70% in comparison with the non-catalyzed systems at the same temperature conditions.

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Section: Resultsmentioning

confidence: 99%

Catalytic Conversion of n-C7 Asphaltenes and Resins II into Hydrogen Using CeO2-Based Nanocatalysts

et al. 2021

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“…Rocha et al 48 also reported effects of Au addition to Ni/Al 2 O 3 catalysts. The Au–Ni catalysts were prepared by mixing the Au solution with the reduced Ni/Al 2 O 3 .…”

Section: Effects Of Alloying On Steam Reforming Of Methane (Srm)mentioning

confidence: 96%

“…Furthermore, earlier reports show that CH 4 activation requires an ensemble of active metals rather than a single active metal atom. 17,48 Rostrup-Nielsen 17 reported in 1984 that three Ni atoms are involved in the reaction. Rocha et al 48 reported in 2019 that two adjacent Ni atoms are necessary for CH 4 activation.…”

Section: Properties Of Metals That Exhibit High Activity For Srm and Drmmentioning

confidence: 99%

“…17,48 Rostrup-Nielsen 17 reported in 1984 that three Ni atoms are involved in the reaction. Rocha et al 48 reported in 2019 that two adjacent Ni atoms are necessary for CH 4 activation. It is often discussed that when the active site is an ensemble of active metals, the ensemble effect, in which the second metal dilutes the ensemble of active metals, engenders a decrease in the activity.…”

Section: Properties Of Metals That Exhibit High Activity For Srm and Drmmentioning

confidence: 99%

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Effects of alloying for steam or dry reforming of methane: a review of recent studies

Torimoto

Sekine

2022

Catal. Sci. Technol.

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“…The CO fraction decreased by one order of magnitude; moreover, the poisoning effect of carbon monoxide on the membrane can be minimized by the CO 2 capture. de Oliveira Rocha et al studied the effect of addition of Au to 15% Ni/Al2O3 catalysts in steam reforming of methane [64]. DRIFTS-CO showed that gold modified the surface structure of nickel, by blocking the low coordination Ni sites with high electron density and high activity in CH 4 activation, and changing the type of CO adsorption, from bridge to linear form.…”

Section: Kinetics and Simulationsmentioning

confidence: 99%

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

2020

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Hydrogen is an important raw material in chemical industries, and the steam reforming of light hydrocarbons (such as methane) is the most used process for its production. In this process, the use of a catalyst is mandatory and, if compared to precious metal-based catalysts, Ni-based catalysts assure an acceptable high activity and a lower cost. The aim of a distributed hydrogen production, for example, through an on-site type hydrogen station, is only reachable if a novel reforming system is developed, with some unique properties that are not present in the large-scale reforming system. These properties include, among the others, (i) daily startup and shutdown (DSS) operation ability, (ii) rapid response to load fluctuation, (iii) compactness of device, and (iv) excellent thermal exchange. In this sense, the catalyst has an important role. There is vast amount of information in the literature regarding the performance of catalysts in methane steam reforming. In this short review, an overview on the most recent advances in Ni based catalysts for methane steam reforming is given, also regarding the use of innovative structured catalysts.

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Effect of Au doping of Ni/Al2O3 catalysts used in steam reforming of methane: Mechanism, apparent activation energy, and compensation effect

Cited by 26 publications

References 56 publications

Catalytic Conversion of n-C7 Asphaltenes and Resins II into Hydrogen Using CeO2-Based Nanocatalysts

Catalytic Conversion of n-C7 Asphaltenes and Resins II into Hydrogen Using CeO2-Based Nanocatalysts

Effects of alloying for steam or dry reforming of methane: a review of recent studies

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

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