Synthesis of Ce and Pr-promoted Ni and Co catalysts from hydrotalcite type precursors by reconstruction method

Muñoz, Mónica; Moreno, Sonia; Molina, Rafael

doi:10.1016/j.ijhydene.2012.09.132

Cited by 70 publications

(15 citation statements)

References 71 publications

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“…[25] He et al [24] investigated Ni-Co HT catalysts with different metal compositions and deduced that Co 2 + ions were more difficult to substitute into the HT structures than Ni 2 + ions, which caused only a fraction of the Co ions to be deeply incorporated within the HT-derived matrix, some of them tending to be [a] The dispersion of metals was measured on reduced samples. MuÇoz et al [27] pointed out that signals in the low-temperature zone (< 350 8C) in the TPR profiles of Ni-Co HT-like catalysts corresponded to the reduction of Co 3 O 4 species to CoO and Co, whereas a second low-temperature event (350-550 8C) was attributed to the complex surface reduction of the octahedral Co 2 + /Co 3 + species contained in Co 2 AlO 4 and/ or CoAl 2 O 4 structures and to the reduction of NiO species. During the reduction, this led to differences in the extraction of Co ions from the HT-derived matrix, giving rise to two reduction regions: 200-500 8C corresponding to the easily reducible Co ions and 620-920 8C corresponding to the remaining Co/Ni ions.…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Pd/Ni–Co Catalyst for Hydrogen Production by Chemical Looping Coupled With Steam Reforming of Acetic Acid

et al. 2014

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High yield of high-purity H2 from acetic acid, a model compound of bio-oil obtained from the fast pyrolysis of biomass, was produced by sorption-enhanced steam reforming (SESR). An oxygen carrier was introduced into a chemical loop (CL) coupled to the cyclical SESR process to supply heat in situ for the endothermic sorbent regeneration to increase the energy efficiency of the process. A new multifunctional 1 %Pd/20 %Ni-20 %Co catalyst was developed for use both as oxygen carrier in the CL and as reforming catalyst in the SESR whereas a CaO-based material was used as CO2 sorbent. In the sorbent-air regeneration step, the Ni-Co atoms in the catalyst undergo strong exothermic oxidation reactions that provide heat for the CaO decarbonation. The addition of Pd to the Ni-Co catalyst makes the catalyst active throughout the whole SESR-CL cycle. Pd significantly promotes the reduction of Ni-Co oxides to metallic Ni-Co during the reforming stage, which avoids the need for a reduction step after regeneration. H2 yield above 90 % and H2 purity above 99.2 vol % were obtained.

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Section: Resultsmentioning

confidence: 99%

Multifunctional Pd/Ni–Co Catalyst for Hydrogen Production by Chemical Looping Coupled With Steam Reforming of Acetic Acid

et al. 2014

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“…were extensively used for steam reforming of tar [180][181][182][183]. The addition of REOs to Ni-based catalysts lead to the improvement of metallic dispersion, the increase of redox properties, the minimization of metal sintering and the enhancement of the resistance to carbon deposition and sulfur poisoning [181][182][183][184][185]. These behaviors could be attributed to the enhanced generation of oxygen vacancies in doped REOs [181,186].…”

Section: Doping With Rare Earth Oxides (Reos)mentioning

confidence: 99%

Preparation, modification and development of Ni-based catalysts for catalytic reforming of tar produced from biomass gasification

Zhang

Liu

Shen

et al. 2018

Renewable and Sustainable Energy Reviews

234

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“…Another rare earth oxide praseodymium oxide is also an effective promoter for reforming catalysts, because it can improve the oxygen storage capacity, promote metal dispersion and electronic transformation . The effect of Pr on nickel‐based catalysts was studied .…”

Section: Reforming Catalystsmentioning

confidence: 99%

A survey of nickel-based catalysts and monolithic reformers of the onboard fuel reforming system for fuel cell APU applications

Liu

2016

Int. J. Energy Res.

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Summary This paper presented a detailed survey of the catalysts for fuel reforming, including nickel‐based catalysts with alkalis, alkaline earths, rare earths, noble metals, and hydrotalcite‐type precursors. All these additions can enhance the Ni catalysts in regarding with activity, coke resistivity, and sintering resistivity. Smaller Ni particle size, more even particle dispersion, and less free NiO and NiAl2O4 can be obtained with these additions. Physicochemical characterization, activity, stability, coke resistance, and the effects of different precursors were summarized and compared. Development of the most commonly used monolithic reformer was also summarized, and different reformer configurations were presented chronologically. Homogeneous mixing of the completely evaporated fuel with air and steam, as well as uniform distribution of the mixture flow are the two main concerns in reformer design. Reforming energy conversion efficiency around 80%, power density above 3 kW/L, and specific power above 3 kW/kg are also reported in the most recent monolithic reformer. Copyright © 2016 John Wiley & Sons, Ltd.

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Synthesis of Ce and Pr-promoted Ni and Co catalysts from hydrotalcite type precursors by reconstruction method

Cited by 70 publications

References 71 publications

Multifunctional Pd/Ni–Co Catalyst for Hydrogen Production by Chemical Looping Coupled With Steam Reforming of Acetic Acid

Multifunctional Pd/Ni–Co Catalyst for Hydrogen Production by Chemical Looping Coupled With Steam Reforming of Acetic Acid

Preparation, modification and development of Ni-based catalysts for catalytic reforming of tar produced from biomass gasification

A survey of nickel-based catalysts and monolithic reformers of the onboard fuel reforming system for fuel cell APU applications

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