Selective Oxidation Catalysis of Glycerol

Selective oxidation of glycerol transforms an abundant by-product of biodiesel manufacture into high-value chemicals, including glyceric acid, dihydroxyacetone and glyceraldehyde. This field integrates heterogeneous catalysis, reaction engineering and green chemistry to modulate conversion and product distributions under mild conditions. Noble metal catalysts such as gold, platinum and palladium supported on oxides or carbonaceous materials have long dominated, often requiring alkaline media to enhance deprotonation of hydroxyl groups and to suppress deep oxidation. Advances in catalyst design now exploit bimetallic synergies, acid–base tuning of supports and single-atom or cluster architectures to improve activity, selectivity and stability. Photocatalytic systems and base-free protocols further reduce environmental impact. Key challenges remain in controlling C–H versus O–H activation pathways, minimising C–C cleavage and achieving cascade reactions with high selectivity. Progress in this arena underpins sustainable routes to fine chemicals, demonstrating broad applicability in pharmaceuticals, cosmetics and polymer precursors.

Research from Nature Portfolio

Recent studies have reported a cascade synergistic catalyst combining atomic platinum sites with low-coordinated platinum clusters on a Cu–CuZrOx support. Atomic Pt1 centres preferentially activate C–H bonds in glycerol to form glyceraldehyde, while adjacent platinum clusters facilitate O–H activation and C=O insertion. In the tandem step, clusters promote further oxidation of glyceraldehyde to glyceric acid, with atomic Pt1 enhancing C–H activation in the second stage. This dual-site approach achieved glycerol conversion exceeding 90 % and glyceric acid selectivity above 80 % under mild conditions, highlighting the importance of precise control over metal speciation and support interactions for cascade oxidation processes.

Selective Oxidation Catalysis of Glycerol publication trend

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

Technical terms

Atomic site: An isolated metal atom dispersed on a support that acts as a distinct catalytic centre.

Bimetallic catalyst: A catalyst comprising two different metals, whose interaction can modulate activity and selectivity.

Base-free conditions: Reaction medium without added alkali, relying on catalyst or support basicity to deprotonate substrates.

C–H activation: The catalytic cleavage of a carbon–hydrogen bond, a key step in selective oxidation pathways.

Cascade reaction: A sequence of two or more transformations occurring consecutively at a single catalytic site or in one pot without intermediate separation.

References

1. Converting Glycerol into Valuable Trioses by Cuδ+‐Single‐Atom‐Decorated WO3 under Visible Light. Angewandte Chemie International Edition (2024).
2. Selective Oxidation of Glycerol by Highly Active Bimetallic Catalysts at Ambient Temperature under Base‐Free Conditions. Angewandte Chemie International Edition (2011).
3. Pt1 enhanced C-H activation synergistic with Ptn catalysis for glycerol cascade oxidation to glyceric acid. Nature Communications (2022).