Heterogeneous Partial (amm)Oxidation and Oxidative Dehydrogenation Catalysis on Mixed Metal Oxides

Védrine, J.C.

doi:10.3390/catal6020022

Cited by 48 publications

(18 citation statements)

References 110 publications

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“…The severe reaction conditions, however, often cause undesirable side reactions and consecutive reactions of the desired products, which makes it difficult to achieve high selectivity toward the desired products at a high conversion rate. One usually proceeds either by oxidative dehydrogenation (ODH)-such as, for example, the dehydrogenation of allyl alcohol to acrolein over bulk or supported silver-based catalysts [59] or of lower alkanes to the corresponding olefins [54]-or by oxidation/ammoxidation with gaseous oxygen in controlled conditions (lower conversion leading to higher selectivity but necessitating the recycling of the reactant) [60].…”

Section: Selective 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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Section: Selective Oxidation Reactionsmentioning

confidence: 99%

Heterogeneous Catalysis on Metal Oxides

2017

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“…The catalytic oxidative dehydrogenation of ethane does not have the thermodynamic constraints of the non-oxidative process, and the energy balance is favored by the milder operating temperatures [2]. Besides, in an oxidizing atmosphere, coke formation is minimized or directly avoided, and CO 2 emission can be significantly reduced [3].…”

Section: Introductionmentioning

confidence: 99%

Novel Ni-Ce-Zr/Al2O3 Cellular Structure for the Oxidative Dehydrogenation of Ethane

et al. 2017

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A novel γ-alumina-supported Ni-Ce-Zr catalyst with cellular structure was developed for oxidative dehydrogenation of ethane (ODHE). First, powdered samples were synthesized to study the effect of both the total metal content and the Ce/Zr ratio on the physicochemical properties and performance of these catalysts. All synthesized powdered samples were highly active and selective for ODHE with a maximum ethylene productivity of 6.94 µmol ethylene g act cat −1 s −1 . According to the results, cerium addition increased the most reducible nickel species population, which would benefit ethane conversion, whereas zirconium incorporation would enhance ethylene selectivity through the generation of higher amounts of the least reducible nickel species. Therefore, the modification of active site properties by addition of both promoters synergistically increases the productivity of the Ni-based catalysts. The most efficient formulation, in terms of ethylene productivity per active phase amount, contained 15 wt% of the mixed oxide with Ni 0.85 Ce 0.075 Zr 0.075 composition. This formulation was selected to synthesize a Ni-Ce-Zr/Al 2 O 3 structured body by deposition of the active phase onto a homemade γ-alumina monolith. The structured support was manufactured by extrusion of boehmite-containing dough. The main properties of the Ni 0.85 Ce 0.075 Zr 0.075 powder were successfully preserved after the shaping procedure. In addition, the catalytic performance of the monolithic sample was comparable in terms of ethylene productivity to that of the powdered counterpart.

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“…Finally, a third site, a V-Mo-O phase is needed for another oxygen insertion to convert aldehyde into acrylic acid. It is recognized that the V 5+ ion activates alkane by first H abstraction and followed by second H abstraction to produce the allylic radical before the insertion of oxygen [9].…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF pH ON THE PHYSICOCHEMICAL PROPERTIES AND REDUCIBILITY OF MoVTeNbOx CATALYSTS

Ramli¹

2016

MJAS

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A range of MoVTeNbOx catalysts were synthesised by slurry method assisted with a microwave irradiation. The pH of the synthesis solution was varied at pH = 1, 3, 5, and 7 and the obtained solid were calcined in air at 553 K for 1 hour and followed in N 2 at 873 K for 2 hours. The calcined samples were characterised and their reduction properties were evaluated. The pH of the synthesis solution was shown to affect the physicochemical properties where the formation of orthorhombic M1 phase was obtained for catalysts prepared at pH 1 and 3. The reducibility of the catalyst is improved for catalyst prepared at pH 3 as compared to those prepared at pH 1. Although higher synthesised pH (5 and 7) gave much higher reducibility of the metal oxides, however the removable oxygen could be of the unselective ones.Keywords: MoVTeNbOx catalysts, pH, reducibility, propane, acrylic acid Abstrak Satu siri mangkin MoVTeNbOx telah disintesis menggunakan kaedah buburan dibantu oleh radiasi gelombang mikro. Nilai pH bagi larutan sintesis telah dikaji pada pH = 1, 3, 5, dan 7 dan pepejal yang diperolehi telah dikalsin dalam udara pada 553 K selama 1 jam dan diikuti dalam nitrogen pada 873 K selama 2 jam. Sampel terkalsin telah dicirikan dan sifat kebolehturunan telah dikaji. Di dapati, pH bagi larutan sintesis memberi kesan kepada ciri fizikokimia di mana pembentukan fasa ortorombik M1 telah terjadi bagi mangkin yang disediakan pada pH 1 dan 3. Kebolehturunan mangkin ini dipertingkatkan bagi mangkin yang disediakan pada pH 3 berbanding yang disediakan pada pH 1. Walaupun mangkin yang disediakan pada pH yang lebih tinggi (5 dan 7) memberikan kebolehturunan logam oksida lebih tinggi, namun penyingkiran oksigen mungkin menjadi tidak selektif.Kata kunci: mangkin MoVTeNbOx, pH, kebolehturunan, propana, asid akrilik IntroductionMoVTeNbOx is a quaternary mixed metal oxide catalyst consists of four different elements which are molybdenum, vanadium, tellurium and niobium. The catalyst is reportedly the most effective catalyst system for the vapour phase catalytic oxidation of propane to form acrylic acid [1][2][3][4][5][6]. It is because the catalyst contains necessary active sites which is fundamental in propane oxidation [7]. The active MoVTeNbOx system possesses two crystalline phases which are orthorhombic M1 phase, Te 2 M 20 O 57 (M = Mo, V, Nb), and hexagonal M2 phase, Te 0.33 MO 3.33 (M = Mo, V, Nb) [8]. The significant difference exists among these two phases is that the M1 phase contains V 5+ centres, as an agent for propane activation [4,7]. Meanwhile, M2 is incapable of activating propane, but it does convert

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Heterogeneous Partial (amm)Oxidation and Oxidative Dehydrogenation Catalysis on Mixed Metal Oxides

Cited by 48 publications

References 110 publications

Heterogeneous Catalysis on Metal Oxides

Heterogeneous Catalysis on Metal Oxides

Novel Ni-Ce-Zr/Al2O3 Cellular Structure for the Oxidative Dehydrogenation of Ethane

EFFECT OF pH ON THE PHYSICOCHEMICAL PROPERTIES AND REDUCIBILITY OF MoVTeNbOx CATALYSTS

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