Bifunctional Catalysts for Hydroisomerization of Alkanes

Hydroisomerization of alkanes is an industrially vital process that converts linear paraffins into branched isomers with improved cold‐flow and combustion properties. Bifunctional catalysts underpin this transformation by combining metallic sites—typically noble or transition metals—that mediate hydrogenation/dehydrogenation steps with acidic sites—most often provided by zeolitic or mesoporous supports—that facilitate skeletal rearrangement. The synergy between metal and acid functions governs activity, selectivity and stability, while pore architecture and acidity distribution control diffusion and suppress undesired cracking. Advances in nanoscale synthesis have enabled hierarchical supports with tailored mesoporosity and crystal morphology, enhancing mass transport and tuning metal–acid proximity. Such developments address global imperatives for cleaner fuels, lower energy consumption and the valorisation of long-chain and bio-derived feedstocks. Emerging trends include the strategic use of growth modifiers to refine zeolite crystallisation, the design of membrane reactors to minimise diffusional constraints and the exploration of non-noble metals to reduce cost without sacrificing performance.

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Bifunctional Catalysts for Hydroisomerization of Alkanes publication trend

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Technical terms

Bifunctional catalyst: A catalyst possessing both metallic and acidic active sites to enable sequential hydrogenation/dehydrogenation and skeletal rearrangement.

Hydroisomerization: A catalytic process that transforms linear alkanes into branched isomers under hydrogen in the presence of acid sites.

Zeolite: A crystalline aluminosilicate with uniform micropores and Brønsted acidity, widely used as an acid support in hydroisomerisation.

Brønsted acid site: A proton donor site within a catalyst framework that catalyses carbocationic rearrangements leading to isomer formation.

Mesoporosity: The presence of pores in the 2–50 nm range that enhances mass transport and alleviates diffusion limitations in porous catalysts.

References

1. The Preparation of Nanosized Pd/ZSM-23 Bifunctional Catalysts for n-Hexadecane Hydroisomerization by Employing PHMB as the Growth Modifier. Transactions of Tianjin University (2023).
2. Utilization of Loaded Cobalt onto MCM-48 Mesoporous Catalyst as a Heterogeneous Reaction in a Fixed Bed Membrane Reactor to Produce Isomerization Product from n-Heptane. Catalysts (2023).
3. Relation between Morphology and Porous Structure of SAPO-11 Molecular Sieves and Chemical and Phase Composition of Silicoaluminophosphate Gels. Gels (2022).