Synthesis, characterization, and evaluation of nickel catalysts on nanocrystalline CeO2 promoted by K and Mn for medium-temperature shift reaction and hydrogen purification

Irankhah, Abdullah; Heidari, Fatemeh; Davoodbeygi, Yegane

doi:10.1007/s11164-017-3062-9

Cited by 10 publications

(9 citation statements)

References 28 publications

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“…Upon impregnating with metals the rate of reaction is multiplied enormously due to the synergism obtained between CeO 2 and metals. There is significant amount of work reported for various types of CeO 2 as support for Ni‐based mono and bi metallic catalysts at high temperature region ,. Kawi's group have reported that the small crystallite size of CeO 2 is able to enhance the dispersion of metal species.…”

Section: Wgs Over Ni‐based Catalystsmentioning

confidence: 99%

“…Similar to Na doping, K as an alkali metal dopant to Ni‐based catalysts is also used extensively in order to enhance WGS activity and product selectivity. Various doping amounts of K to Ni powder, Ni/CeO 2 , catalysts, LaNiO 3 perovskites and M−FeOx (M=Cr, Mn, Co, Ni and Cu) structures were investigated for WGS reaction. For different Ni‐based systems i. e., Ni/CeO 2 and LaNiO 3 perovskites, Kawi‘s group, has observed that doping K to Ni‐based catalysts enhanced the reducibility of the catalyst.…”

Section: Modifications To Ni‐based Catalysts For Methane Suppressionmentioning

confidence: 99%

“…In another study, K/Ni metal showed methane selectivity of 0.19 %, while Ni metal produced about 25.1 % of methane at 350 °C . Similarly, methane formation is reduced from 90 % to 3 % upon doping K to Ni/CeO 2 at 360 °C . Unlike the phenomena of preventing sub‐carbonyl adsorption for Na doping, K doping enhanced the strength of CO adsorption by forming bridging CO on Ni surface, which prevents methane formation by suppressing CO disproportionation reaction.…”

Section: Modifications To Ni‐based Catalysts For Methane Suppressionmentioning

confidence: 99%

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Nickel‐based Catalysts for High‐temperature Water Gas Shift Reaction‐Methane Suppression

2018

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This article provides a critical review of Ni-based catalysts employed in high temperature and ultra-high temperature water gas shift reaction (WGS) for hydrogen production and methane suppression. The promotional role of nature and type of active metal and support for WGS reaction is discussed with respect to activity and selectivity. This review mainly covers the recent strategic catalytic formulations like promotion with alkali metals, alloying with another metal and core@-shell-like structures for suppressing methanation during WGS reaction. The change in nature and strength of CO adsorption over modified Ni-surfaces is discussed using available in situ CO-DRIFTS results. The various WGS reaction and CO methanation pathways are also presented together with insights gained from computational DFT studies.[a] Dr.

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Section: Wgs Over Ni‐based Catalystsmentioning

confidence: 99%

Section: Modifications To Ni‐based Catalysts For Methane Suppressionmentioning

confidence: 99%

Section: Modifications To Ni‐based Catalysts For Methane Suppressionmentioning

confidence: 99%

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Nickel‐based Catalysts for High‐temperature Water Gas Shift Reaction‐Methane Suppression

2018

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“…The prepared support was calcined at 400°C for 4 h [36]. According to previous research in our laboratory, the 10Ni-6K/ CeO 2 (BET = 4.23 m 2 g -1 ) [35] catalyst was prepared by impregnation of Ni(NO 3 ) 2 .6H 2 O and KNO 3 on the CeO 2 support, followed by drying and calcination similar to the support. The 10Ni-6K/CeO 2 catalyst was named Ni-K/CeO 2 for short.…”

Section: Catalyst Synthesismentioning

confidence: 99%

“…In this work, nickel metal-based catalysts on a cerium oxide support were fabricated and used in the MTS reaction to evaluate their activities. Additionally, the alkali metal potassium was loaded on the Ni/CeO 2 catalysts to decrease the methanation side-reaction [35]. Also, in this study, EPD of the Ni-K/CeO 2 catalysts from various solvents was performed and the suspension characteristics were investigated in order to achieve the best catalyst coating for the MTS reaction in a microreactor.…”

Section: Introductionmentioning

confidence: 99%

Water‐Gas Shift Reaction in a Microchannel Ni‐based Catalytic Coated Reactor: Effect of Solvents

Bazdar

Irankhah

2020

Chem Eng & Technol

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Medium-temperature shift (MTS) reaction was investigated in a microchannel reactor using the electrophoretic deposition (EPD) method to coat porous layers of Ni-K/CeO 2 catalyst on stainless-steel plates. The electrolyte suspensions of the catalyst were prepared in isopropanol, ethanol, methanol, and acetone as solvents. All EPD experiments were carried out under similar conditions (i.e., for a contact time of 3 min, at a voltage of 140 V, and in the presence of 0.3 wt % polyethylenimine as the dispersant). The effect of the different solvents on the coated catalytic layers was studied using Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and 2D and 3D optical imaging. The experimental results proved that the best performance for the MTS reaction in the plate microreactor was achieved with isopropanol as the solvent.

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A Review on the Water‐Gas Shift Reaction over Nickel‐Based Catalysts

et al. 2022

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Recent advances in supported nickel catalysts for the water-gas shift (WGS) reaction are reviewed, focusing on the structuremechanism relationships. The WGS reaction can proceed via the redox, carboxyl, and formate pathways over the supported nickel catalysts. However, a discrepancy exists between the mechanism-level understanding and catalyst design principles in literature. In this review, we summarized the mechanismstructure relationship of nickel-based catalysts, emphasizing the effects of the formation of alloy, modification of the support or addition of alkali metal promoters on the CO adsorption and the H 2 O dissociation in the process of WGS reaction. Future research is suggested to systematically investigate the reaction mechanism & kinetics for different catalyst structures. In addition, the manipulation of strong metal-support interactions and the development of new types of supports are prospective directions.

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Synthesis, characterization, and evaluation of nickel catalysts on nanocrystalline CeO2 promoted by K and Mn for medium-temperature shift reaction and hydrogen purification

Cited by 10 publications

References 28 publications

Nickel‐based Catalysts for High‐temperature Water Gas Shift Reaction‐Methane Suppression

Nickel‐based Catalysts for High‐temperature Water Gas Shift Reaction‐Methane Suppression

Water‐Gas Shift Reaction in a Microchannel Ni‐based Catalytic Coated Reactor: Effect of Solvents

A Review on the Water‐Gas Shift Reaction over Nickel‐Based Catalysts

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