Catalysts for the Selective Oxidation of Methanol

Brookes, Catherine; Bowker, Michael; Wells, Peter P.

doi:10.3390/catal6070092

Cited by 41 publications

(47 citation statements)

References 63 publications

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“…In order to determine which factors affect the active species for methanol selective oxidation on iron molybdate catalysts, Brookes et al [10][11][12][13] have studied this catalytic system extensively. It was concluded that selective oxidation of methanol depends on the presence of a molybdenum oxide dominated surface layer.…”

Section: Introductionmentioning

confidence: 99%

Operando XAS/XRD and Raman Spectroscopic Study of Structural Changes of the Iron Molybdate Catalyst during Selective Oxidation of Methanol

et al. 2019

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The structural changes of an iron molybdate/molybdenum oxide (Mo/Fe = 2.0) catalyst for the selective oxidation of methanol to formaldehyde were studied using combined operando X-ray absorption spectroscopy (XAS) and X-ray diffraction (XRD) as well as operando Raman spectroscopy. Under operating conditions, the Mo K-edge XANES spectra showed a transition from a mixture of α-MoO 3 and Fe 2 (MoO 4 ) 3 towards only Fe 2 (MoO 4 ) 3 . XRD and Raman spectroscopy also showed disappearance of the α-MoO 3 phase with time on stream. The results evidenced that the α-MoO 3 component evaporated completely, while the Fe 2 (MoO 4 ) 3 component remained stable. This was linked to a decrease in catalytic activity. Further studies unraveled that the rate of α-MoO 3 evaporation increased with increasing MeOH concentration, decreasing O 2 concentration and increasing temperature. The simultaneous measurements of catalytic activity and spectroscopy allowed to derive a structure-activity relationship showing that α-MoO 3 evaporation needs to be prevented to optimize MoO 3 -based catalysts for selective oxidation of methanol.

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Section: Introductionmentioning

confidence: 99%

Operando XAS/XRD and Raman Spectroscopic Study of Structural Changes of the Iron Molybdate Catalyst during Selective Oxidation of Methanol

et al. 2019

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“…In parallel, the study of the reactivity of biomass on oxide surfaces has many more fundamental problems arising from the complexity of the electronic structure of these materials but also for the much wider variability in the types of elementary steps that they allow. For instance, ceria and molybdenum oxides have been described as active in the transformation of methanol (a byproduct of several biomass conversion processes) into formaldehyde . For CeO 2 , the structure sensitivity drives the selectivity: the closed‐packed (111) and (110) surfaces produce formaldehyde, which on the (100) surface is further oxidized to CO .…”

Section: Introductionmentioning

confidence: 99%

Developments in the Atomistic Modelling of Catalytic Processes for the Production of Platform Chemicals from Biomass

Garcı́a-Muelas

Rellán‐Piñeiro

et al. 2018

ChemCatChem

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The transformation of biomass‐derived molecules into platform chemicals that can directly be employed by the chemical industry is one of the challenges in catalysis in this century. While some processes are cost‐effective and industrially available, the molecular insight has been advancing at a slow pace when compared to other areas (like energy conversion). In the present review we describe the main challenges imposed on the theoretical simulations for the study of these complex molecules and how the most crucial issues are typically addressed. In particular, we focus on technical aspects like the need for London dispersion and solvation contributions. We also deal with the complexity of reaction networks, which requires new approaches and ways to compile the results in the form of databases. This allows the study of large reaction networks for the decomposition of C2 alcohols, or the plethora of functional groups of cyclic molecules such as lignin and sugars. Finally, we put forward a few applications that show the potential of atomistic simulations in the field.

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“…Demand for formaldehyde is increasing, and currently exceeds 30 MT/year [1], while demand for acetaldehyde is around 1 MT/year, while unregenerable catalysts are unable to support these requirements. Recently, considerable interest is being paid to the dehydrogenation of methanol and ethanol due to the safety and sustainability aspects of the reaction compared to the oxidative route.…”

Section: Introductionmentioning

confidence: 99%

Highly Selective Solid Acid Catalyst H1−xTi2(PO4)3−x(SO4)x for Non-Oxidative Dehydrogenation of Methanol and Ethanol

2017

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Abstract:The conversion of alcohols towards aldehydes in the presence of catalysts by non-oxidative dehydrogenation requires special importance from the perspective of green chemistry. Sodium (Na) super ionic conductor (NASICON)-type hydrogen titanium phosphate sulfate (HTPS; H 1−x Ti 2 (PO 4 ) 3−x (SO 4 ) x , x = 0.5-1) catalysts were synthesized by the sol-gel method, characterized by N 2 gas sorption, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), NH 3 temperature-programmed desorption (NH 3 -TPD), ultraviolet-visible (UV-VIS) spectroscopy, and their catalytic properties were studied for the non-oxidative dehydrogenation of methanol and ethanol. The ethanol is more reactive than methanol, with the conversion for ethanol exceeding 95% as compared to methanol, where the conversion has a maximum value at 55%. The selectivity to formaldehyde is almost 100% in methanol conversion, while the selectivity to acetaldehyde decreases from 56% to 43% in ethanol conversion, when the reaction temperature is increased from 250 to 400 • C.

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Catalysts for the Selective Oxidation of Methanol

Cited by 41 publications

References 63 publications

Operando XAS/XRD and Raman Spectroscopic Study of Structural Changes of the Iron Molybdate Catalyst during Selective Oxidation of Methanol

Operando XAS/XRD and Raman Spectroscopic Study of Structural Changes of the Iron Molybdate Catalyst during Selective Oxidation of Methanol

Developments in the Atomistic Modelling of Catalytic Processes for the Production of Platform Chemicals from Biomass

Highly Selective Solid Acid Catalyst H1−xTi2(PO4)3−x(SO4)x for Non-Oxidative Dehydrogenation of Methanol and Ethanol

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