Effect of MnOx in the catalytic stabilization of Co2MnO4 spinel during the ethanol steam reforming reaction

Kwak, Byeong Sub; Lee, Ga-Young; Park, Sunmin; Kang, Misook

doi:10.1016/j.apcata.2015.06.037

Cited by 21 publications

(7 citation statements)

References 44 publications

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“…Moreover, reducible oxides such as ZnO and CeO 2 provide a spillover of oxygen species to the metal particles dispersed on their surfaces, thereby facilitating the oxidation of the carbon deposit [2,3,5,[7][8][9][10][11]. However, although manganese oxides possess plenty of active lattice oxygen species that play a role in the efficient elimination of carbon deposition, there are not many reports [1,[12][13][14][15][16] on their use as a support for the catalysts of SRE reaction. Both types of manganese oxides with layered and tunnel structures were the subject of this research [12,14,15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Potassium Doping on the Structural and Catalytic Properties of Co/MnOx Catalyst in the Steam Reforming of Ethanol

Greluk,

Rotko,

Słowik

et al. 2023

Materials

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The promotional effect of potassium (~1.25 wt%) on a Co/MnOx catalyst was studied for samples prepared by the impregnation method in the steam reforming of ethanol (SRE) process at 420 °C for a H2O/EtOH molar ratio of 12/1. The catalysts were characterized using physicochemical methods to study their textural, structural, and redox properties. The XRD studies revealed that, during the treatment of both cobalt-based catalysts under a hydrogen atmosphere at 500 °C, Co0 and MnO phases were formed by the reduction in Co3O4 and Mn2O3/Mn3O4 phases, respectively. Potassium doping significantly improved stability and ability for the C–C bond cleavage of the Co/MnOx catalyst. The enhancement of activity (at ~25%) and selectivity to hydrogen (at ca. 10%) and the C1 product, mainly carbon dioxide (at ~20%), of the Co/MnOx catalyst upon potassium doping was clarified by the alkali promoter’s impact on the reducibility of the cobalt and manganese oxides. The microscopic observations revealed that fibrous carbon deposits are present on the surface of Co/MnOx and KCo/MnOx catalysts after the SRE reaction and their formation is the main reason these catalysts deactivate under SRE conditions. However, carbon accumulation on the surface of the potassium-promoted catalyst was ca. 12% lower after 18 h of SRE reaction compared to the unpromoted sample.

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Section: Introductionmentioning

confidence: 99%

Effect of Potassium Doping on the Structural and Catalytic Properties of Co/MnOx Catalyst in the Steam Reforming of Ethanol

Greluk,

Rotko,

Słowik

et al. 2023

Materials

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“…In the literature, there are only a few studies on the application of manganese oxides in an SRE reaction over cobalt-or nickel-based catalysts. Most of these reports concern the application of this oxide as a modifier of cobalt-based catalysts [5,18,19]. Lee et al [18] showed that the introduction of manganese oxides to the Co 10 Si 90 MCM-48 material had a favorable effect on its catalytic performance in the SRE process by preventing the catalytic deactivation caused by the sintering of cobalt particles.…”

Section: Introductionmentioning

confidence: 99%

Effect of Potassium Promoter on the Performance of Nickel-Based Catalysts Supported on MnOx in Steam Reforming of Ethanol

et al. 2022

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The effect of a potassium promoter on the stability of and resistance to a carbon deposit formation on the Ni/MnOx catalyst under SRE conditions was studied at 420 °C for different H2O/EtOH molar ratios in the range from 4/1 to 12/1. The catalysts were prepared by the impregnation method and characterized using several techniques to study their textural, structural, and redox properties before being tested in a SRE reaction. The catalytic tests indicated that the addition of a low amount of potassium (1.6 wt.%) allows a catalyst with high stability to be obtained, which was ascribed to high resistance to carbon formation. The restriction of the amount of carbon deposits originates from the potassium presence on the Ni surface, which leads to (i) a decrease in the number of active sites available for methane decomposition and (ii) an increase in the rate of the steam gasification of carbon formed during SRE reactions.

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“…Based on the catalyst cost and performance, transition-metal oxides are generally used to replace precious metal (Me) catalysts. Among them, the spinel transition-metal oxides of AB 2 O 4 have aroused great interest of scientists engaged in the eld of catalyzes, such as water-gas shift reactions (Poggio-Fraccari et al 2014), fuel cells (Chani et al 2019), the removal of gaseous pollutants (Ye et al 2017;Sun et al 2020), and steam reforming (Kwak et al 2015). CuMn 2 O 4 is one of the popular catalysts used in the catalytic process owing to its possible application (Hirunsit et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Effect of ambient factors over spinel CuMn2O4 for toluene catalytic ozonation: Enhancement of the synergy and the generation of ROS

Wang

Zhao²,

et al. 2022

Preprint

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Herein, the effect of ambient factors (O3 concentration, temperature, and humidity) was explored in catalytic ozonation of toluene by using CuMn2O4, which possessed a great steady-state activity (~ 73%) at the optimal conditions (2100 ppm O3, 100℃, and dry air). Under various conditions, a strong correlation was observed between O3 consumption, toluene oxidation, and COx formation. The technology of DRIFTS and GC-MS were used to study the effects of influencing factors on the toluene degradation process. Cu+ plays an important role in the adsorption of toluene and the oxidation of toluene to benzoic acid. The ·OH and temperature suppressed the deposition of carbonaceous by-products. On the other hand, the situation of the effect of influence factors was investigated by SEM, BET, XPS, and TG. It is revealed that reactive oxygen species are the key to catalytic ozonation and participate in catalytic oxidation of toluene as an electron transfer intermediate on active sites (Cux+-Ov-Mny+).

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Effect of MnOx in the catalytic stabilization of Co2MnO4 spinel during the ethanol steam reforming reaction

Cited by 21 publications

References 44 publications

Effect of Potassium Doping on the Structural and Catalytic Properties of Co/MnOx Catalyst in the Steam Reforming of Ethanol

Effect of Potassium Doping on the Structural and Catalytic Properties of Co/MnOx Catalyst in the Steam Reforming of Ethanol

Effect of Potassium Promoter on the Performance of Nickel-Based Catalysts Supported on MnOx in Steam Reforming of Ethanol

Effect of ambient factors over spinel CuMn2O4 for toluene catalytic ozonation: Enhancement of the synergy and the generation of ROS

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