The effect of a nickel promoter on the reducibility of a commercial Cu/ZnO/Al2O3 catalyst for CO oxidation

Chen, Ching-Shiun; You, Jiann-Hwa; Lin, Jarrn-Horng; Chen, Chi-Ruei; Lin, Keng-Min

doi:10.1016/j.catcom.2007.11.007

Cited by 25 publications

(10 citation statements)

References 21 publications

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“…The Ni 2p 3/2 , Co 2p 3/2 and Cu 2p 3/2 XP spectra of 5M5MAl catalyst samples are presented in Figure 8 . As shown in Figure 8 a, the Ni 2p 3/2 signal is composed of a main band centered at 855.34 eV, accompanied by two satellites at BEs of 861.77 and 866.8 eV, and assigned to Ni 2+ in NiAl 2 O 4 [ 41 , 42 ]. The presence of Co 2+ in CoAl 2 O 4 was also confirmed by the Co 2p 3/2 peak at 781.14 eV, accompanied by the satellite peak at around 786.09 eV [ 43 , 44 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization and Catalytic Activity of Ternary Oxide Catalysts Using the Microwave-Assisted Solution Combustion Method

et al. 2020

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Ni−Co−Al, Ni−Cu−Al and Co−Cu−Al ternary oxide catalysts, with a fixed 5 wt% transition metal loading, were prepared by the microwave-assisted solution combustion method and tested in CO oxidation. The bulk and surface properties of the catalysts were investigated, using XRD, N2 adsorption–desorption, SEM, XPS and TEM techniques. XRD, XPS and TEM results revealed that nickel and cobalt were present as spinels on the surface and in the bulk. Differently, copper was preferentially present in “bulk-like” CuO-segregated phases. No interaction between the couples of transition metal species was detected, and the introduction of Cu-containing precursors into the Ni−Al or Co−Al combustion systems was not effective in preventing the formation of NiAl2O4 and CoAl2O4 spinels in the Ni− or Co-containing catalysts. Copper-containing catalysts were the most active, indicating that copper oxides are the effective active species for improving the CO oxidation activity.

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Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization and Catalytic Activity of Ternary Oxide Catalysts Using the Microwave-Assisted Solution Combustion Method

et al. 2020

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“…Nickel-based catalysts were studied by El-Shobaky et al [83][84][85] and Chen at al. [86] The study of El-Shobaky et al was mainly focused on the physicochemical properties of NiO-Al 2 O 3 systems, prepared by co-precipitation and impregnation. In their studies [83,84] they did not observe the formation of the spinel phase at temperatures below 850 • C. Higher activation temperatures (above 850 • C) resulted in the formation of the nickel aluminate phase.…”

Section: Comparison Of the Catalyst Performances With Similar Materiamentioning

confidence: 99%

“…In their studies [83,84] they did not observe the formation of the spinel phase at temperatures below 850 • C. Higher activation temperatures (above 850 • C) resulted in the formation of the nickel aluminate phase. Chen et al [86] clearly demonstrated the low activity of nickel-based catalysts for CO oxidation. Indeed, reduced 15 wt% Ni/Al 2 O 3 catalyst showed full conversion of CO at around 500 • C.…”

Section: Comparison Of the Catalyst Performances With Similar Materiamentioning

confidence: 99%

Influence of the Fuel/Oxidant Ratio on the Elaboration of Binary Oxide Catalyst by a Microwave-Assisted Solution Combustion Method

et al. 2020

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Three series of binary metal oxide catalysts containing Ni, Cu, or Co oxides were prepared, fully characterized and tested in CO oxidation. The catalysts, with a constant transition metal loading of 10 wt%, were prepared from metal nitrates and urea mixtures by a microwave-assisted solution combustion method. The RV/OV ratio, corresponding to the stoichiometry of the reactants, calculated from their elemental oxidizing and reducing valences, was varied. In order to modify the redox character of the synthesis medium from the quantity of urea; an excess of urea was used for attaining reducing conditions, while a deficit of urea shifted the medium to oxidizing conditions. Three RV/OV ratios (0.9, 1.0, and 1.1) were selected to elaborate the different binary metal oxide catalysts, nine oxide catalysts were synthesized. Then, the influence of the stoichiometry (RV/OV ratio) on the bulk and surface properties of the binary metal oxide catalysts was investigated. Similarly, the influence of the RV/OV ratio on the CO oxidation activity was discussed and the optimal value of RV/OV ratio was identified. The results show that the increasing of the RV/OV ratio from 0.9 to 1.1, particularly in Ni- and Co-containing catalysts, induces stronger metal-aluminum interactions, in the form of aluminates phases, and that are correlated to the dramatic reduction of the CO oxidation activity. The best physicochemical properties and highest catalytic activities were achieved with the catalysts prepared in redox systems stoichiometrically balanced (RV/OV = 1). The Cu-containing catalysts presented the best catalytic activities in CO oxidation.

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“…Furthermore, among the various metal oxide catalyst supports, alumina remains the most used due to its mechanical and physico-chemical properties. For example, CO oxidation over cobalt, copper or nickel oxide-based catalysts supported on alumina has been investigated by various research groups [28,29,30,31,32,33,34,35]. Yao et al [28] compared two methods for preparing Co 3 O 4 /Al 2 O 3 catalysts; mechanical mixing and impregnation process.…”

Section: Introductionmentioning

confidence: 99%

Binary Oxides Prepared by Microwave-Assisted Solution Combustion: Synthesis, Characterization and Catalytic Activity

et al. 2019

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Three different alumina-based Ni, Cu, Co oxide catalysts with metal loading of 10 wt %, and labeled 10Ni–Al, 10Co–Al and 10Cu–Al, were prepared by microwave-assisted solution combustion. Their morphological, structural and surface properties were deeply investigated by complementary physico-chemical techniques. Finally, the three materials were tested in CO oxidation used as test reaction for comparing their catalytic performance. The 10Cu–Al catalyst was constituted of copper oxide phase, while the 10Ni–Al and 10Co–Al catalysts showed the presence of “spinels” phases on the surface. The well-crystallized copper oxide phase in the 10Cu–Al catalyst, obtained by microwave synthesis, allowed for obtaining very high catalytic activity. With a CO conversion of 100% at 225 °C, the copper containing catalyst showed a much higher activity than that usually measured for catalytic materials of similar composition, thus representing a promising alternative for oxidation processes.

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The effect of a nickel promoter on the reducibility of a commercial Cu/ZnO/Al2O3 catalyst for CO oxidation

Cited by 25 publications

References 21 publications

Synthesis, Characterization and Catalytic Activity of Ternary Oxide Catalysts Using the Microwave-Assisted Solution Combustion Method

Synthesis, Characterization and Catalytic Activity of Ternary Oxide Catalysts Using the Microwave-Assisted Solution Combustion Method

Influence of the Fuel/Oxidant Ratio on the Elaboration of Binary Oxide Catalyst by a Microwave-Assisted Solution Combustion Method

Binary Oxides Prepared by Microwave-Assisted Solution Combustion: Synthesis, Characterization and Catalytic Activity

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