Tailored mesoporous silica supports for Ni catalysed hydrogen production from ethanol steam reforming

Parlett, Christopher M. A.; Aydın, Attila; Durndell, Lee J.; Frattini, Lucia; Isaacs, Mark A.; Lee, Adam F.; Liu, Xiaotong; Olivi, Luca; Trofimovaite, Rima; Wilson, Karen; Wu, Chunfei

doi:10.1016/j.catcom.2016.12.021

Cited by 56 publications

(29 citation statements)

References 34 publications

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“…However, the low intrinsic surface area of reducible supports has encouraged the deposition of thin films of these oxides on porous supports. To that end, silica is a very interesting material due to its high surface area and chemically-inert nature [30]. Moreover, the high number of oxygen vacancies in CeO 2 -SiO 2 mixed oxides may increase the lattice oxygen mobility and improve reducibility, activity, and stability of the catalyst [31].…”

Section: Introductionmentioning

confidence: 99%

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

et al. 2017

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Abstract:In this work, a series of CeO 2 -SiO 2 (30 wt % of ceria)-based catalysts was prepared by the wetness impregnation method and tested for ESR (ethanol steam reforming) at 450-500 • C, atmospheric pressure and a water/ethanol ratio increasing from 4 to 6 (the ethanol concentration being fixed to 10 vol %); after every test, coke gasification measurements were performed at the same water partial pressure, and the temperature of the test and the gasified carbon was measured from the areas under the CO and CO 2 profiles. Finally, oxidation measurements under a 5% O 2 /N 2 stream made it possible to calculate the total carbon deposited. In an attempt to improve the coke resistance of a Pt-Ni/CeO 2 -SiO 2 catalyst, the effect of support basification by alkali addition (K and Cs), as well as Pt substitution by Rh was investigated. The novel catalysts, especially those containing Rh, displayed a lowering in the carbon formation rate; however, a faster reduction of ethanol conversion with time-on-stream and lessened hydrogen selectivities were recorded. In addition, no significant gain in terms of coke gasification rates was observed. The most active catalyst (Pt-Ni/CeO 2 -SiO 2 ) was also tested under different operative conditions, in order to study the effect of temperature and water/ethanol ratio on carbon formation and gasification. The increase in the water content resulted in an enhanced reactor-plugging time due to reduced carbonaceous deposits formation; however, no effect of steam concentration on the carbon gasification rate were recorded. On the other hand, the increase in temperature from 450-500 • C lowered the coke selectivity by almost one order of magnitude improving, at the same time, the contribution of the gasification reactions.

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Section: Introductionmentioning

confidence: 99%

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

et al. 2017

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“…Hydrogen yield (500°C, 1000 min), nickel particle size, and nickel surface area as a function of the concentration of the preparation-assisted Pluronic P123 copolymer (reproduced from [63]). dimensional pore network material (KIT-6) [105], and the use of different impregnation media (ethanol or water) [106], have been developed to improve the catalytic performance in the ESR reaction.…”

Section: Reviewmentioning

confidence: 99%

Effect of Supports and Promoters on the Performance of Ni‐Based Catalysts in Ethanol Steam Reforming

et al. 2020

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Ethanol steam reforming (ESR) is one of the potential processes to convert ethanol into valuable products. Hydrogen produced from ESR is considered as green energy for the future and can be an excellent alternative to fossil fuels with the aim of mitigating the greenhouse gas effect. The ESR process has been well studied, using transition metals as catalysts coupled with both acidic and basic oxides as supports. Among various reported transition metals, Ni is an inexpensive material with activity comparable to that of noble metals, showing promising ethanol conversion and hydrogen yields. Additionally, different promoters and supports were utilized to enhance the hydrogen yield and the catalyst stability. This review summarizes and discusses the influences of the supports and promoters of Ni‐based catalysts on the ESR process.

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“…The fact that this catalyst has the same acetaldehyde production as the 10Ni/SBA-15 indicates that there is a minimum amount of carbide needed to increase the acetaldehyde production. This could be due to the fact that the adsorption of ethanol on the cobalt surface, the first step in both reforming and dehydrogenation of ethanol, is a structure sensitive reaction [20] and therefore needing the formation of a specific ensemble of active atoms to constitute the cobalt carbide active site.…”

Section: Characterization Studies After Steam Reforming Of Ethanolmentioning

confidence: 99%

“…Once again, the high price and poor availability of metals as Ru, Pt, Rh or Pd, advises the use of cheaper alternatives, especially Ni, but also Co and/or Cu [15][16][17][18][19], even though these metals favor the deposition of carbonaceous deposits. The carbon deposition processes can be mitigated in several ways, as changing the ethanol/water ratio, introducing oxygen in the feed mixture or using different kind of supports [20,21]. 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.…”

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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Tailored mesoporous silica supports for Ni catalysed hydrogen production from ethanol steam reforming

Cited by 56 publications

References 34 publications

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

Effect of Supports and Promoters on the Performance of Ni‐Based Catalysts in Ethanol Steam Reforming

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

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