Nickel-copper-chromium catalyst for selective methane oxidation to synthesis gas at short residence times

Попова, Н. М.; Salakhova, R. Kh.; Досумов, К.; Тунгатарова, С.А.; Sass, A.S.; Zheksenbaeva, Z.T.; Komashko, L. V.; Grigor’eva, V. P.; Shapovalov, A. A.

doi:10.1134/s0023158409040144

Cited by 13 publications

(8 citation statements)

References 21 publications

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“…The CuNi alloy with surface Cu enrichment is also evidenced by La Rosa et al, 51 which showed that no significant carbon deposition has been observed after operation for 2000 h. By hydrogen chemisorption and FTIR spectroscopy of CO adsorption, Kitla et al 52 clearly demonstrated that the surface of CuNi bimetallic particles is strongly enriched by Cu, and surface Cu enrichment markedly reduces coking occurring preferentially on Ni-based catalyst, while maintaining methane activation. Surface segregation of Cu in NiCu alloy has also been detected by Popova et al, 53 who indicated that the CuNi catalyst effectively resists the carbon deposition. Therefore, on the basis of above experimental studies, we can believe that CuNi alloy with surface Cu enrichment, namely, CuNi alloy with the segregated Cu surface, can exist in the real catalytic system.…”

Section: Articlementioning

confidence: 85%

“…49−53 By hydrogen chemisorption and FTIR spectroscopy of CO adsorption, Kitla et al 52 clearly demonstrated that the surface of CuNi bimetallic particles is strongly enriched by Cu, and Cu surface enrichment markedly reduces coking occurring preferentially on Ni-based catalyst, moreover, the ability of CH 4 activation is still maintained. Surface segregation of Cu in NiCu alloy also has been detected by Popova et al, 53 who indicated that CuNi catalyst effectively resists the carbon deposition. These results show that the segregation of Cu and Fe modifies the surface morphology of Ni-based alloy, then, the modification of surface morphology will in turn have an effect on the adsorption properties of key intermediates, further on the reactivity of the deposited carbon with oxygen intermediates.…”

Section: Introductionmentioning

confidence: 87%

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Insight Into the Effect of CuNi(111) and FeNi(111) Surface Structure and Second Metal Composition on Surface Carbon Elimination by O or OH: A Comparison Study with Ni(111) Surface

et al. 2015

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A density functional theory (DFT) calculation has been carried out to systematically investigate the mechanism of surface carbon elimination by O and OH on both the alloy FeNi(111) and CuNi(111) surfaces, including the homogeneous and the segregated surfaces, respectively; meanwhile, the obtained results are compared with those on the pure Ni(111) surface in order to probe into the effects of CuNi(111) and FeNi(111) surface structure and second metal composition on the performance of surface carbon elimination. Our results show that compared to the pure Ni(111) surface, the introduction of Fe into Ni increases the adsorption of O, OH, and C species, while it weakens the adsorption of CO and COH; the incorporation of Cu into Ni decreases the adsorption ability of C, O, OH, CO, and COH species. The mechanism of surface carbon elimination by O and OH shows that OH species is more effective for carbon elimination than O species on Ni(111), CuNi(111) surface and the segregated FeNi(111) surface; meanwhile, CuNi(111) and FeNi(111) surface structure and second metal composition have obvious effect on the performance of carbon elimination. Compared to Ni(111), FeNi(111) surface is not favorable for carbon elimination, while CuNi(111) surface is beneficial for carbon elimination, in which the Cu enriched surface is much more favorable than the 1:1 Cu surface and the pure Ni(111), indicating that the segregated CuNi(111) surface with Cu enrichment significantly accelerates carbon elimination. Moreover, the good linear relationship exists between the average adsorption energy of C + O or C + OH and the activation barrier of the C + O(OH) reaction. As a result, once carbon is formed on the segregated CuNi alloy surface with Cu enrichment, carbon deposits can be timely eliminated, which can well explain the reported experimental facts that CuNi bimetallic catalysts with Cu surface enrichment display excellent carbonresistance ability in CH 4 /CO 2 reforming.

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Section: Articlementioning

confidence: 85%

Section: Introductionmentioning

confidence: 87%

Insight Into the Effect of CuNi(111) and FeNi(111) Surface Structure and Second Metal Composition on Surface Carbon Elimination by O or OH: A Comparison Study with Ni(111) Surface

et al. 2015

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“…From the structural point of view, Cr 2 O 3 has been reported to act as an efficient promoter in catalytic formulations for many reactions, such as Fischer-Tropsch synthesis [24], water-gas shift [25], and partial oxidation of methane [26], because Cr 2 O 3 can act as a textural promoter to prevent the rapid loss of specific surface area of the support due to thermal sintering under the reaction conditions. Also, it was found that the high oxygen mobility in the crystal lattice of the Cr 2 O 3 support, is crucial for inhibiting coke formation on the Ni-based catalysts [27].…”

Section: Introductionmentioning

confidence: 99%

Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Yang

Pastor‐Pérez

et al. 2018

Applied Catalysis B: Environmental

157

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In the context of Carbon Capture and Utilisation (CCU), the catalytic reduction of CO 2 to CO via reverse watergas shift (RWGS) reaction is a desirable route for CO 2 valorisation. Herein, we have developed highly effective Ni-based catalysts for this reaction. Our study reveals that CeO 2 -Al 2 O 3 is an excellent support for this process helping to achieve high degrees of CO 2 conversions. Interestingly, FeO x and CrO x , which are well-known active components for the forward shift reaction, have opposite effects when used as promoters in the RWGS reaction. The use of iron remarkably boosts the activity, selectivity and stability of the Ni-based catalysts, while adding chromium results detrimental to the overall catalytic performance. In fact, the iron-doped material was tested under extreme conditions (in terms of space velocity) displaying fairly good activity/stability results. This indicates that this sort of catalysts could be potentially used to design compact RWGS reactors for flexible CO 2 utilisation units.

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“…The selectivity of CO and H 2 formation was 99%–100%; CO 2 traces were also formed (0.005%). The catalyst did not decrease its activity for 56 h …”

Section: Catalyst Developmentmentioning

confidence: 97%

“…The selectivity of CO and H 2 formation was 99%−100%; CO 2 traces were also formed (0.005%). The catalyst did not decrease its activity for 56 h. 230 DRM and POM were carried out over NiCoM (M = Mn, Fe, Cu) trimetallic catalysts. The conversion and yield values are better for systems with the addition of Mn.…”

Section: Catalyst Developmentmentioning

confidence: 99%

Active Components of Catalysts of Methane Conversion to Synthesis Gas: Brief Perspectives

Zagaynov

2021

Energy Fuels

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Methane transformation into more valuable products has attracted extensive attention. Synthesis gas is an important intermediate product in the chemical industry. Several syngas production methods are available, depending on the purpose of the industrial application. A major limitation of the processes is the rapid deactivation of the catalyst, which has been commonly attributed to the sintering of the active sites of catalyst and carbon formations on these sites, induced by methane decomposition and CO disproportionation. The catalyst consists of an active component and support. Ceria-based systems have been extensively employed as the support because of their unique redox properties and high oxygen storage capacity. The most promising approach is to design an excellent active site of the catalyst, based on noble or transition metals. A comparison of perspective active components, especially polymetallic components, is considered here.

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Nickel-copper-chromium catalyst for selective methane oxidation to synthesis gas at short residence times

Cited by 13 publications

References 21 publications

Insight Into the Effect of CuNi(111) and FeNi(111) Surface Structure and Second Metal Composition on Surface Carbon Elimination by O or OH: A Comparison Study with Ni(111) Surface

Insight Into the Effect of CuNi(111) and FeNi(111) Surface Structure and Second Metal Composition on Surface Carbon Elimination by O or OH: A Comparison Study with Ni(111) Surface

Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Active Components of Catalysts of Methane Conversion to Synthesis Gas: Brief Perspectives

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