Mechanism of partial oxidation of methanol over MoO3

Chung, Jong Shik; Miranda, R.; Bennett, C. O.

doi:10.1016/0021-9517(88)90043-7

Cited by 97 publications

(56 citation statements)

References 18 publications

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“…The presence of H 2 CO was indicative of the presence of a methoxy intermediate at the surface. Methoxy has been proven to be present on MoO 3 [52,62].…”

Section: In Situ Investigations Under Meoh/he To Provide Insights Intmentioning

confidence: 99%

“…This has proved a challenge for many researchers [24,45]. which reacts with lattice oxygen to form a second hydroxide, which proceeds to be lost as water under oxidative conditions [52]. If the oxygen level is insufficient, the produced hydrogen will be introduced into the surface, creating a surface bronze denoted HxMoO3.…”

Section: Initial Investigations Into the Mechanism And Reaction Site mentioning

confidence: 99%

“…If Mo exists as active and selective Mo (VI), the reaction proceeds via scission of the C-H bond, considered to be the rate-determining step. The process yields formaldehyde and a proton, which reacts with lattice oxygen to form a second hydroxide, which proceeds to be lost as water under oxidative conditions [52]. If the oxygen level is insufficient, the produced hydrogen will be introduced into the surface, creating a surface bronze denoted H x MoO 3 .…”

Section: Initial Investigations Into the Mechanism And Reaction Site mentioning

confidence: 99%

“…OH recombination occurs to yield H2O from the catalyst [52]. The anion vacancy is re-oxidised from the bulk (anaerobic) or gas phase (aerobic) oxygen.…”

Section: Initial Investigations Into the Mechanism And Reaction Site mentioning

confidence: 99%

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Catalysts for the Selective Oxidation of Methanol

2016

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Abstract:In industry, one of the main catalysts typically employed for the selective oxidation of methanol to formaldehyde is a multi-component oxide containing both bulk Fe 2 (MoO 4 ) 3 and excess MoO 3 . It is thought that the excess MoO 3 primarily acts to replace any molybdenum lost through sublimation at elevated temperatures, therefore preventing the formation of an unselective Fe 2 O 3 phase. With both oxide phases present however, debate has arisen regarding the active component of the catalyst. Work here highlights how catalyst surfaces are significantly different from bulk structures, a difference crucial for catalyst performance. Specifically, Mo has been isolated at the surface as the active surface species. This leaves the role of the Fe in the catalyst enigmatic, with many theories postulated for its requirement. It has been suggested that the supporting Fe molybdate phase enables lattice oxygen transfer to the surface, to help prevent the selectivity loss which would occur in the resulting oxygen deficit environment. To assess this phenomenon in further detail, anaerobic reaction with methanol has been adopted to evaluate the performance of the catalyst under reducing conditions.

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“…The presence of H 2 CO was indicative of the presence of a methoxy intermediate at the surface. Methoxy has been proven to be present on MoO 3 [52,62].…”

Section: In Situ Investigations Under Meoh/he To Provide Insights Intmentioning

confidence: 99%

Section: Initial Investigations Into the Mechanism And Reaction Site mentioning

confidence: 99%

Section: Initial Investigations Into the Mechanism And Reaction Site mentioning

confidence: 99%

“…OH recombination occurs to yield H2O from the catalyst [52]. The anion vacancy is re-oxidised from the bulk (anaerobic) or gas phase (aerobic) oxygen.…”

Section: Initial Investigations Into the Mechanism And Reaction Site mentioning

confidence: 99%

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Catalysts for the Selective Oxidation of Methanol

2016

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“…and the pellet is assumed to be isothermal due to large catalyst thermal conductivity. 3. The gases diffusing through the pellet follow the ideal gas law [14].…”

Section: Mathematical Modelmentioning

confidence: 99%

Simulation of the Industrial Packed Bed Catalytic Reactor for the Partial Oxidation of Methanol to Formaldehyde:

Moustafa

2003

Dev. Chem. Eng. Mineral Process.

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A detailed diffiion-reaction kinetic model was developed in this study for an industrial methanol partial oxidation reactor. Unlike, most of the kinetic models in the literature that either neglected or approximated the intra-particle diffusion, the details of the mass trans@r limitations were taken into consideration for this reaction system. The catalyst pellet was modeled using the rigorous dusty gas model based on Stefan-Maxwell equations. Four reactions are considered and an efficient minimization routine was used to extract the kinetic rate coefficients for these reactions using industrial reactor data.

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Catalytic Oxidations of Inorganic and Organic Compounds

Bartholomew

Farrauto²

2005

Fundamentals of Industrial Catalytic Processes

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Mechanism of partial oxidation of methanol over MoO3

Cited by 97 publications

References 18 publications

Catalysts for the Selective Oxidation of Methanol

Catalysts for the Selective Oxidation of Methanol

Simulation of the Industrial Packed Bed Catalytic Reactor for the Partial Oxidation of Methanol to Formaldehyde:

Catalytic Oxidations of Inorganic and Organic Compounds

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