Understanding the differences in catalytic performance for hydrogen production of Ni and Co supported on mesoporous SBA-15

Rodriguez‐Gomez, Alberto; Pereñíguez, Rosa; Caballero, A.

doi:10.1016/j.cattod.2017.02.020

Cited by 19 publications

(13 citation statements)

References 42 publications

(40 reference statements)

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“…CeO 2‐x goes through reduction/oxidation cycles along the reaction, enhancing oxygen mobility and coke gasification, thus improving the catalyst stability. Accordingly, an intimate contact between ceria and the active metal phase (coke promoter) should facilitate the process, and this can be addressed by using a high surface support [32–34] . On the other hand, a proper dispersion of the active metal phase has been shown to reduce graphitic coke formation by suppressing methane decomposition (the main source of coke at high temperatures), [35,36] a structure‐sensitive reaction which is favored in larger crystal [37,38] .…”

Section: Introductionmentioning

confidence: 99%

Elucidating the Promotional Effect of Cerium in the Dry Reforming of Methane

et al. 2020

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A series of Ni‐Ce catalysts supported on SBA‐15 has been prepared by co‐impregnation, extensively characterized and evaluated in the carbon dioxide reforming of methane (DRM). The characterization by TEM, XRD and TPR has allowed us to determine the effect of metal loading on metal dispersion. Cerium was found to improve nickel location inside the mesopores of SBA‐15 and to suppress coke formation during the DRM reaction. The analysis by XPS allowed us to associate the high cerium dispersion with the presence of low‐coordinated Ce3+ sites, being main responsible for its promotional effect. A combination of XAS and XPS has permitted us to determine the physicochemical properties of metals under reduction conditions. The low nickel coordination number determined by XAS in N‐Ce doped systems after reduction suggests the generation of very small nickel particles which showed greater catalytic activity and stability in the reaction, and a remarkable resistance to coke formation.

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Section: Introductionmentioning

confidence: 99%

Elucidating the Promotional Effect of Cerium in the Dry Reforming of Methane

et al. 2020

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“…Among them, Ni‐based catalysts are widely investigated due to low cost and relatively high activity . However, Ni is prone to coke deposition and particle sintering . Coke deposition originates mainly from CH 4 decomposition [Eq.…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7][8] However, Ni is prone to coke deposition and particle sintering. [9] Coke deposition originates mainly from CH 4 decomposition [Eq. (2)] and/or Boudouard reaction [Eq.…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, it has been revealed that the supported Co catalysts show good activity for dry reforming process. [9,[12][13][14][15] Even though the catalytic activity is neither superior to Ni nor to other noble metal catalysts such as Ru and Rh, studies on the supported Co catalysts have reported to produce good catalytic performance with significantly lower carbon deposition. [16,17] Previous study suggested that the rate of carbon deposition and the type of deposited carbon on Co metal are different from that on Ni metal.…”

Section: Introductionmentioning

confidence: 99%

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Development of Co Supported on Co−Al Spinel Catalysts from Exsolution of Amorphous Co−Al Oxides for Carbon Dioxide Reforming of Methane

et al. 2019

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In this study, redox exsolution method was used to synthesize Co/Co−Al spinel for dry reforming. The aim is to improve metal‐support interaction, which enhances the catalyst's stability and minimizes carbon deposition. The synthesized catalysts were observed as Co embedded on Co deficient CoAl2O4‐like spinel (denoted as Co−Al spinel). The reduction temperature was optimized at 750 °C. Investigations on the effect of Co loading revealed that optimum Co loading is needed to control the Co particle size, providing balance between limiting carbon deposition rate and preventing dissolution of Co into the support. The best performing catalyst, Co‐15, in which the molar ratio of Co and Al is 15 : 85 produced a stable 81.5 % and 87.4 % conversions for CH4 and CO2 continuously over 24 h of reaction time with 13.51 wt% of carbon deposition. The strong metal‐support interaction of Co and Co−Al spinel in Co‐15 stabilizes and prevents the sintering of Co particles, enhancing the efficiency for dry reforming reaction.

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“…An alternative strategy to overcome this issue involves the use of bimetallic systems, where the synergistic effects of the two metals can improve their catalytic performances. In this sense Ni-Co is one of the most popular couple being used for this SRE reaction but also for reforming of methane [19,[22][23][24][25][26]. It has been previously reported that the combining effect of this two metals is able to produce less amount but also less harmful carbon deposits [6].…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Ni-Co/SBA-15 catalysts for reforming of ethanol: How cobalt modifies the nickel metal phase and product distribution

Rodriguez‐Gomez

Caballero

2018

Molecular Catalysis

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In this study, five mono and bimetallic xNi-(10-x)Co/SBA-15 catalysts (x=10, 8, 5, 2 and 0, with a total metallic content of 10 wt%) have been synthesized using a deposition-precipitation (DP) methodology. Catalytic performances on the steam reforming of ethanol reaction (SRE) have been determined and correlated with their physical and chemical state. A nickel content of 5% or higher yields catalytic systems with good activity, high selectivity to hydrogen and a low production of acetaldehyde (less than 5%). However, in the systems where the cobalt is the main component of the metallic phase (8-10 %), the selectivity changes, mainly due to the production of an excess of acetaldehyde, which is also reflected in the larger H2/CO2 ratio. In agreement with previous findings, this important modification in the selectivity comes from the formation of a cobalt carbide phase, where only takes place in the cobalt enriched systems, and is inhibited with nickel content larger than 5%. The formation of this carbide phase seems to be responsible for the decrease of cobalt particle size during the SRE reaction. Even though this cobalt carbide phase is thermodynamically metastable against decomposition to metallic cobalt and graphite carbon, our results have shown that it only reacts and decomposes after a hydrogen treatment at 600 oC.

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Understanding the differences in catalytic performance for hydrogen production of Ni and Co supported on mesoporous SBA-15

Cited by 19 publications

References 42 publications

Elucidating the Promotional Effect of Cerium in the Dry Reforming of Methane

Elucidating the Promotional Effect of Cerium in the Dry Reforming of Methane

Development of Co Supported on Co−Al Spinel Catalysts from Exsolution of Amorphous Co−Al Oxides for Carbon Dioxide Reforming of Methane

Bimetallic Ni-Co/SBA-15 catalysts for reforming of ethanol: How cobalt modifies the nickel metal phase and product distribution

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