Transition metal oxides for combustion and depollution processes

Bion, Nicolas; Can, Fabien; Courtois, Xavier; Duprez, Daniel

doi:10.1016/b978-0-12-811631-9.00006-5

Cited by 13 publications

(10 citation statements)

References 316 publications

(370 reference statements)

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“…Metal oxide catalysts are applied in a wide range of catalytic reactions, including selective reduction reactions, selective oxidation reactions and total oxidation reactions [1][2][3]. Transition metal oxides are very interesting in heterogeneous catalysis, due to their improved and tunable acid-base and redox properties [4][5][6][7]. Additional assets are the easy availability, the low price, the durability, the regeneration capability, and the resistance to poisoning [8].…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…Ni, Co or Cu oxide-based catalysts are among the most commonly used catalysts in heterogeneous catalysis. They have several advantages, including their availability and their low price, which make them a good alternative to expensive noble metal catalysts [ 5 , 6 , 7 ]. Ni, Co or Cu oxide-based catalysts are not widely used solely as heterogeneous catalysts due to their sensitivity to poisoning and their low thermal stability [ 6 ].…”

Section: Introductionmentioning

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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“…Transition metal oxides (M = Mn, Co, Fe, Ni) are potential catalysts for application in combustion and depollution processes [68]. Owing to huge improvements in their preparation, perovskites (LnBO 3 , in which Ln is a lanthanide (usually La) and the B cation possesses two valence states like Mn, Co, or Fe, e.g., La 1−x M x MnO 3+δ with M = Ce, Sr), spinels, hexaaluminates and some other oxide structures can replace noble metals in a number of processes.…”

Section: Total Oxidation Reactionsmentioning

confidence: 99%

Heterogeneous Catalysis on Metal Oxides

2017

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This review article contains a reminder of the fundamentals of heterogeneous catalysis and a description of the main domains of heterogeneous catalysis and main families of metal oxide catalysts, which cover acid-base reactions, selective partial oxidation reactions, total oxidation reactions, depollution, biomass conversion, green chemistry and photocatalysis. Metal oxide catalysts are essential components in most refining and petrochemical processes. These catalysts are also critical to improving environmental quality. This paper attempts to review the major current industrial applications of supported and unsupported metal oxide catalysts. Viewpoints for understanding the catalysts' action are given, while applications and several case studies from academia and industry are given. Emphases are on catalyst description from synthesis to reaction conditions, on main industrial applications in the different domains and on views for the future, mainly regulated by environmental issues. Following a review of the major types of metal oxide catalysts and the processes that use these catalysts, this paper considers current and prospective major applications, where recent advances in the science of metal oxide catalysts have major economic and environmental impacts.

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Transition metal oxides for combustion and depollution processes

Cited by 13 publications

References 316 publications

Influence of the Fuel/Oxidant Ratio on the Elaboration of Binary Oxide Catalyst by a 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

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

Heterogeneous Catalysis on Metal Oxides

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