Oxidations carried out by means of vanadium oxide catalysts

Mars, P.; Krevelen, D.W. Van

doi:10.1016/s0009-2509(54)80005-4

Cited by 1,857 publications

(1,116 citation statements)

References 10 publications

Supporting

Mentioning

1,034

Contrasting

Unclassified

Order By: Relevance

“…3) but it can rather be the catalytically active species, in a scheme known as Mars and van Krevelen mechanism. 79 Focusing on the oxidation of a hydrocarbon, This reaction scheme occurs in many catalysed oxidations of hydrocarbons by metal oxides, such as: (i) propene oxidation to acrolein by molybdenum and bismuth oxides 81 (ii) total oxidation of volatile organic compounds like benzene and hexane by cerium oxides, 82 and (iii) oxidative dehydrogenation by vanadium oxides. 83 This mechanism is quite important both in industrial applications and for fundamental studies.…”

Section: Oxygen Activation By a Metalmentioning

confidence: 99%

Catalytic oxygen activation versus autoxidation for industrial applications: a physicochemical approach

Liu

Ryabenkova

Conte

2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

The activation and use of oxygen for the oxidation and functionalization of organic substrates is among the most important reactions in a chemist's toolbox. Nevertheless, despite the vast literature on catalytic oxidation, the phenomenon of autoxidation, an ever-present background reaction that occurs in virtually every oxidation process, is often neglected. In contrast, autoxidation can affect the selectivity to a desired product, to those dictated by pure freeradical chain pathways, thus affecting the activity of any catalyst used to carry out a reaction.This critical review compares catalytic oxidation routes by transition metals versus autoxidation, particularly focusing on the industrial context, where highly selective and "green" processes are needed. Furthermore, the application of useful tests to discriminate between different oxygen activation routes, especially in the area of hydrocarbon oxidation, with the aim of an enhanced catalyst design, is described and discussed. In fact, one of the major targets of selective oxidation is the use of molecular oxygen as ultimate oxidant, combined with the development of catalysts capable to perform the catalytic cycle in a real energy and cost effective manner on a large scale. To achieve this goal, insights from metallo-proteins that could find application in some areas of industrial catalysis are presented, as well as considering the physicochemical principles that are at the fundament of oxidation and autoxidation processes.3

show abstract

Section: Oxygen Activation By a Metalmentioning

confidence: 99%

Catalytic oxygen activation versus autoxidation for industrial applications: a physicochemical approach

Liu

Ryabenkova

Conte

2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…One of the most important tasks for fundamental research is to attain a clear understanding of mechanisms: (1) how lattice oxygen atoms contribute toward chemical reactions and, (2) how dopants modify surface activity. It is widely believed that CO directly combines with lattice oxygen atom on ceria, through the Mars-van Krevelen mechanism [7]. However, the relevant reaction dynamics has not been satisfactorily unravelled.…”

Section: Introductionmentioning

confidence: 99%

Direct CO Oxidation by Lattice Oxygen on Zr-Doped Ceria Surfaces

Yang

Zhang

et al. 2010

Catal Lett

View full text Add to dashboard Cite

Systematic density-functional calculations have been performed to address an important issue for CO oxidation on redox ceria: the role of lattice oxygen. One major findings is that CO easily grasps one lattice oxygen atom to form CO 2 -and CO 2 on CeO 2 (111) and Ce 0.75 Zr 0.25 O 2 (111) with small activation energies. Zr dopants facilitate the reduction of Ce ?4 to Ce ?3 and hence weaken the Ce-O bonds, which benefit the direct formation and release of CO 2 .

show abstract

“…However, under these conditions sublimation of molybdenum can occur, particularly at reactor hot spots and, if there is not sufficient excess molybdenum in the catalyst (i.e. if Mo/Fe is not greater than 1.5), breakdown to oxides occurs [13,[15][16][17][18]: Many authors believe the redox process occurs via a Mars-Van Krevelen type mechanism, [14,[19][20][21]. This mechanism is supported by kinetic studies and experimental works indicating rapid diffusion of bulk oxygen to the catalyst surface [22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

A Combined Multi-Technique In Situ Approach Used to Probe the Stability of Iron Molybdate Catalysts During Redox Cycling

et al. 2009

View full text Add to dashboard Cite

A setup combining a number of techniques (WAXS, XANES and UV-Vis) has been used to probe the stability of an iron molybdate catalyst during redox cycling. The catalyst was first reduced under anaerobic methanol/ helium conditions, producing formaldehyde and then regenerated using air. Although in this test-case the catalyst and conditions differ from that of a commercial catalyst bed we demonstrate how such a setup can reveal new information on catalyst materials.

show abstract

Oxidations carried out by means of vanadium oxide catalysts

Cited by 1,857 publications

References 10 publications

Catalytic oxygen activation versus autoxidation for industrial applications: a physicochemical approach

Catalytic oxygen activation versus autoxidation for industrial applications: a physicochemical approach

Direct CO Oxidation by Lattice Oxygen on Zr-Doped Ceria Surfaces

A Combined Multi-Technique In Situ Approach Used to Probe the Stability of Iron Molybdate Catalysts During Redox Cycling

Contact Info

Product

Resources

About