Catalytic Hydrogenation of Organic Compounds

Catalytic hydrogenation is a fundamental transformation in which molecular hydrogen is added across unsaturated bonds of organic substrates under the influence of a solid or colloidal catalyst. Typically mediated by transition metals such as palladium, platinum, nickel or ruthenium dispersed on oxide or carbon supports, the process proceeds via dissociative adsorption of H₂, surface migration of nascent hydrogen atoms and stepwise hydrogen transfer to unsaturated carbon–carbon or carbon–heteroatom bonds. Key performance metrics include turnover frequency (TOF), selectivity and activation energy. Advances in nanoscale control of particle size, alloy composition and support interactions have enabled exceptional activity and selectivity, even under milder temperatures and pressures. Hydrogenation finds wide application in petrochemical refining, fine-chemical synthesis, pharmaceutical manufacture and biomass upgrading. Emerging challenges focus on achieving ambient-condition reactivity, enhancing catalyst longevity, minimising precious‐metal loadings and extending the scope to challenging substrates such as aromatics and multifunctional molecules.

Research from Nature Portfolio

Recent studies have demonstrated ambient hydrogenation of rigid aromatic substrates by a quinary PdPtRuCuNi high entropy alloy nanocatalyst. Under solvent-free conditions at 25 °C and near-atmospheric H₂ pressure, this material achieves complete hydrogenation of both alkynyl and phenyl groups in solid oligomers, revealing multi-element synergy as a general design principle for low-energy aromatic reduction. Theoretical and experimental investigations attribute the exceptional performance to concerted activation of hydrogen and stabilisation of reaction intermediates by specific alloy sites.

Another significant development established the role of metal-support interactions in copper-based hydrogenation. By engineering a Cu–O–SiOx interface via mesoporous silica coating of copper microparticles, investigators showed that heterolytic H₂ activation at the interface lowers the transition-state energy for ester hydrogenation. This work underpins a broader strategy to exploit support-induced electronic polarisation for efficient, non-noble metal hydrogenation catalysts.

Catalytic Hydrogenation of Organic Compounds publication trend

The graph below shows the total number of articles in catalytic hydrogenation of organic compounds across all publications each year (not limited to Nature Index journals).

Technical terms

Catalytic hydrogenation: Addition of hydrogen to unsaturated organic bonds facilitated by a catalyst.

Turnover frequency (TOF): Number of substrate molecules converted per active site per unit time.

High entropy alloy (HEA): A multimetallic alloy composed of five or more principal elements in near-equimolar ratios, offering unique active sites.

Support: A solid matrix, such as oxide or carbon, used to disperse, stabilise and electronically tune metal catalyst particles.

Semihydrogenation: Selective partial hydrogenation of an alkyne to form an alkene without further reduction to an alkane.

References

1. Ambient hydrogenation of solid aromatics enabled by a high entropy alloy nanocatalyst. Nature Communications (2024).
2. Interfacing with silica boosts the catalysis of copper. Nature Communications (2018).
3. Fully exposed Pd species on nanodiamond/graphene hybrid support for the efficient toluene hydrogenation reaction. EcoEnergy (2023).
4. Selectivity of the Lindlar catalyst in alkyne semi-hydrogenation: a direct liquid-phase adsorption study. Catalysis Science & Technology (2021).