Highly active and stable Ni-Cu supported catalysts prepared by combustion synthesis for hydrogen production from ethanol

Cross, Allison; Miller, Jeffrey T.; Danghyan, V.; Mukasyan, Alexander S.; Wolf, E. L.

doi:10.1016/j.apcata.2018.12.027

Cited by 27 publications

(16 citation statements)

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“…[26] The initial adsorption heats of CO on the Ni/Al 2 O 3 and Cu/Al 2 O 3 catalysts are 110 and 81 kJ/mol, respectively, [19,27] which hints that Cu species are not conductive for the readsorption of the released CO while Ni species have the opposite effect. Therefore, Ni-Cu bimetallic catalysts performed higher CO selectivity owing to the synergistic effect of the existence of Cu species, which inhibited CO chemisorption in the catalysts surface, [28] further preventing the excessive hydrogenation to yield methane from the generated CO, also significantly improving the CO formation rate.…”

Section: Full Papermentioning

confidence: 99%

Efficient Ni‐based catalysts for low‐temperature reverse water‐gas shift (RWGS) reaction

Liu

Xie

et al. 2021

Chemistry An Asian Journal

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CO 2 hydrogenation for syngas can alleviate the pressure of un-controlled emissions of CO 2 and bring enormous economic benefits. Advantageous Ni-catalysts have good CO 2 hydrogenation activity and high CO selectivity merely over 700°C. Herein, we introduced Cu into Ni catalysts, which were evaluated by H 2 -TPR, XRD, BET, in-situ XPS and CO 2 -TPD, and their CO 2 hydrogenation activity and CO selectivity were significantly affected by the Ni/Cu ratios, which was rationalized by the synergistic effect of bimetallic catalysts. In addition, the reduction temperatures of studied catalysts apparently affected the CO 2 hydrogenation, which were caused by the number and dispersion of the active species. It's found that the Ni 1 Cu 1 -400 had good stability, high CO selectivity (up to 90%), and fast formation rate (1.81 × 10 À 5 mol/g cat /s) at 400°C, which demonstrated a good potential as a superior catalyst for reverse water-gas shift (RWGS) reaction.

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Section: Full Papermentioning

confidence: 99%

Efficient Ni‐based catalysts for low‐temperature reverse water‐gas shift (RWGS) reaction

Liu

Xie

et al. 2021

Chemistry An Asian Journal

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“…A recent report compares the catalytic performance of CeO 2 and SiO 2 catalyst containing Ni and NiCu sites using long-term TOS experiments. 86 The catalysts were synthesized by an impregnated support combustion synthesis (ISCS) technique expected to create high surface area and improve metal support interaction compared to the traditional impregnation methods. Nickel supported on CeO 2 deactivates quickly, and incorporating copper along with nickel helps improve the stability slightly, nonetheless the catalyst deactivates after 10 h TOS (Figure 10a).…”

Section: Catalysts For Ethanol Dehydrogenation and Decompositionmentioning

confidence: 99%

“…On the basis of the detailed textural characterizations, the authors reported the high stability of the NiCu/SiO 2 −CS catalyst could be due to two factors: partial encapsulation of active sites in the presence of the SiO 2 support, and the formation CuNi alloys that are known for their coke resistant behavior in reforming reactions. 86 m 2 /g to 155 m 2 /g after the 100 h TOS experiment, and alluded to a partial regeneration of nickel sites that were encapsulated during the synthesis of the catalyst. Revival of the nickel sites could have been a key source in maintaining a stable catalytic activity.…”

Section: Catalysts For Ethanol Dehydrogenation and Decompositionmentioning

confidence: 99%

“…High surface area oxide supports such as silica, alumina, ceria, zirconia, etc. have been broadly investigated to achieve a high dispersion of the active metals and to obtain long-term stable catalytic performance for the ethanol decomposition reaction. ,− Cross et al utilized a self-propagating combustion synthesis technique to synthesize highly dispersed Ni sites supported on γ-Al 2 O 3 . The method utilizes a simple impregnation of a redox mixture containing nickel nitrate and glycine on γ-Al 2 O 3 to create a reactive paste, which is dried and combusted in a self-sustained manner utilizing the combustion energy of the exothermic redox reaction between nickel nitrate and the glycine mixture.…”

Section: Catalysts For Ethanol Dehydrogenation and Decompositionmentioning

confidence: 99%

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Ethanol Decomposition and Dehydrogenation for Hydrogen Production: A Review of Heterogeneous Catalysts

Kumar

2021

Ind. Eng. Chem. Res.

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Biowaste derived ethanol is an important feedstock for carbon neutral hydrogen production. It is liquid at atmospheric conditions, has a high hydrogen to carbon ratio, and it can be generated from biomass, lignocellulosic wastes, and sewage sludge, offering opportunities for converting waste to hydrogen as an alternative to fossil fuels-based sources of hydrogen. A large-scale application of bioethanol for hydrogen production has the potential to considerably reduce CO2 emissions. Recent reviews on ethanol reforming for hydrogen production show a growth in research interest in this topic, although primarily focused on ethanol steam reforming (ESR) in which steam, in addition to ethanol, also acts as an additional source of hydrogen. Ethanol partial oxidation (POx) is another relatively well-studied route, which is exothermic in nature; however, hydrogen selectivity can be compromised due to the presence of oxygen leading to water formation. Ethanol decomposition and dehydrogenation (ED) are relatively less studied compared to the other two routes, possibly due to coke formation that often leads to catalyst deactivation. The past decade has seen an increasing number of papers on ED to exploit it for the production of aldehydes, acetates, and ethers, as well as various forms of carbon along with hydrogen. The goal of this article is to provide a review on the recent development in nonoxidative ethanol dehydrogenation and ethanol decomposition catalysis for hydrogen production. Catalytic studies over the past few decades have benefitted from the unprecedented growth in experimental techniques, particularly from in situ transmission electron microscopy (in situ TEM) and near ambient X-ray photoelectron spectroscopy (NA-XPS), allowing researchers to obtain dynamic structural information caused by reactant–catalyst interactions leading to greater insights based on more realistic information. A review incorporating the current status will allow us to better understand the structure–performance relationship, leading to the implementation of practical and realistic considerations for catalysts synthesis and reactor design for stable performance. The present review is an attempt to put together the recent progress, mainly in the past decade, on the catalysts for ethanol dehydrogenation, experimental conditions for effective extraction of hydrogen and targeted products, and metal–support interactions and their contribution in directing the reaction pathways. For the ease of reading and comprehension, the article is divided into subsections based on metals (transition metals and noble metals) and supports. The review concludes with a table listing the catalysts, synthesis method, reaction environments, and key findings for a quick and easy access to the critical systems assessed during the review process.

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“…[31][32][33][34][35][36][37] Primarily combustion-based techniques have been used to synthesize unsupported materials, however, more recently a shift in the direction of supported catalyst is clearly seen. [38][39][40][41][42] The choice of fumed-SiO 2 is based on some recent reports highlighting its role in achieving a high dispersion of active sites on the surface compared to other supports. 18 Fumed SiO 2 is widely used in industries, however, studies employing it as a catalyst support are limited, though the availability of fibrous morphology resulting in large surface area has demonstrated its potential for application in catalysis.…”

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confidence: 99%

Effect of nickel on combustion synthesized copper/ fumed‐SiO ₂ catalyst for selective reduction of CO ₂ to CO

Kumar

Mohammed

Saad

et al. 2021

Intl J of Energy Research

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In this study, we explore the effect of nickel incorporation in Cu/fumed-SiO 2 catalyst for CO 2 reduction reaction. Two catalysts, Cu and CuNi supported on fumed silica were synthesized using a novel surface restricted combustion synthesis technique, where the combustion reaction takes place on the surface of the inert fumed-SiO 2 support. An active solution consisting of a known amount of metal nitrate precursors and urea (fuel) was impregnated on fumed silica. The catalyst loading was limited to 1 wt% to ensure localized combustions on the surface of fumed-SiO 2 by restricting the combustion energy density. The synthesized catalysts were tested for CO 2 hydrogenation reaction using a tubular packed bed reactor between temperature 50 C and 650 C, where Cu/SiO 2 showed high CO 2 conversion to carbon monoxide, and the addition of Ni further improved the catalytic performance and showed some tendency for methane formation along with CO. Moreover, both the catalysts were highly stable under the reaction conditions and did not show any sign of deactivation for $42 hours time on stream (TOS). The catalysts were characterized using X-ray diffractometer (XRD), scanning electron microscope/energy dispersive X-ray spectrometer (SEM/EDX), transmission electron microscope (TEM), and the Brunauer-Emmet-Teller (BET) surface area measurement technique to understand their structural properties and to assess the effect of CO 2 conversion reaction. In situ DRIFTS was also used to investigate the reaction pathway followed on the surface of the catalysts.

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Highly active and stable Ni-Cu supported catalysts prepared by combustion synthesis for hydrogen production from ethanol

Cited by 27 publications

References 40 publications

Efficient Ni‐based catalysts for low‐temperature reverse water‐gas shift (RWGS) reaction

Efficient Ni‐based catalysts for low‐temperature reverse water‐gas shift (RWGS) reaction

Ethanol Decomposition and Dehydrogenation for Hydrogen Production: A Review of Heterogeneous Catalysts

Effect of nickel on combustion synthesized copper/ fumed‐SiO ₂ catalyst for selective reduction of CO ₂ to CO

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Highly active and stable Ni-Cu supported catalysts prepared by combustion synthesis for hydrogen production from ethanol

Cited by 27 publications

References 40 publications

Efficient Ni‐based catalysts for low‐temperature reverse water‐gas shift (RWGS) reaction

Efficient Ni‐based catalysts for low‐temperature reverse water‐gas shift (RWGS) reaction

Ethanol Decomposition and Dehydrogenation for Hydrogen Production: A Review of Heterogeneous Catalysts

Effect of nickel on combustion synthesized copper/ fumed‐SiO 2 catalyst for selective reduction of CO 2 to CO

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Effect of nickel on combustion synthesized copper/ fumed‐SiO ₂ catalyst for selective reduction of CO ₂ to CO