Selective Oxidation Catalysis for Methanol Conversion

Selective oxidation catalysis of methanol underpins a vast industry chiefly concerned with the production of formaldehyde, a cornerstone intermediate in plastics, resins and disinfectants. In these processes, the catalyst must activate methanol and molecular oxygen to form formaldehyde while suppressing deep oxidation to carbon oxides. Conventional systems employ iron molybdate, often coupled with excess molybdenum oxide, which together balance lattice oxygen availability and surface reactivity. Advances in core–shell architectures have revealed that a discreet layer of molybdenum oxide atop an iron oxide sublayer affords the high selectivity and activity necessary for efficient formaldehyde synthesis. This layered motif promotes rapid oxygen transfer to adsorbed methoxy intermediates and disfavour formation of stable formate species that lead to over-oxidation. Contemporary research also explores alternative supports and active phases, including hydroxyapatite-bound MoOx shells and coinage-metal systems, to enhance catalyst lifetime, suppress volatilisation of molybdenum species and tailor reaction pathways. Mechanistic understanding of lattice oxygen renewal, intermediate desorption kinetics and metal–support interactions is guiding the design of next-generation catalysts capable of operating at lower temperatures, with improved stability and with alternative feedstocks such as bio-derived methanol or CO2-derived routes. The global significance of these developments lies not only in energy and raw-material efficiency but also in lowering the carbon footprint of one of the largest chemical manufacturing processes worldwide.

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Selective Oxidation Catalysis for Methanol Conversion publication trend

The graph below shows the total number of articles in selective oxidation catalysis for methanol conversion across all publications each year (not limited to Nature Index journals).

Technical terms

Selective oxidation catalysis: A reaction in which an alcohol is oxidised to a partially oxidised product (for example, formaldehyde) with minimal further oxidation to CO or CO2.

Oxidative dehydrogenation (ODH): A catalytic pathway in which a substrate loses hydrogen atoms in the presence of oxygen, forming a dehydrogenated product.

Core–shell catalyst: A composite material in which one oxide phase (shell) coats another (core) to combine distinct catalytic properties.

Lattice oxygen: Oxygen atoms incorporated into the crystal structure of an oxide catalyst that participate directly in oxidation reactions.

Methoxy intermediate: A surface-bound species (–OCH3) formed during methanol activation and implicated in formaldehyde formation.

References

1. Methanol oxidation over iron molybdate catalysts. Main and side reactions kinetics. Applied Catalysis A General (2023).
2. Molybdenum Oxide on Fe2O3 Core–Shell Catalysts: Probing the Nature of the Structural Motifs Responsible for Methanol Oxidation Catalysis. ACS Catalysis (2013).
3. Supported silver and copper catalysts in the oxidative dehydrogenation of methanol to formaldehyde: a comparative study under industrially relevant conditions. Catalysis Science & Technology (2023).
4. Highly Stable Apatite Supported Molybdenum Oxide Catalysts for Selective Oxidation of Methanol to Formaldehyde: Structure, Activity and Stability. ChemCatChem (2021).