Segmentation by type distinguishes the catalyst chemistries deployed across the UCO hydrogenation value chain. Homogeneous catalysts, typically soluble metal complexes such as nickel or palladium salts, are favored in high‑throughput biodiesel plants for their rapid kinetics, though they impose higher downstream separation costs. Heterogeneous catalysts, comprising metal‑loaded supports (e.g., Ni‑on‑alumina, Cu‑on‑zeolite) or solid acids/bases, dominate the oleochemical and lubricant segments because they enable continuous operation, catalyst recycling, and lower contaminant levels in the final product. Within the heterogeneous class, supported metal oxides contribute the bulk of market volume, while zeolite‑based catalysts address specialty chemical needs where shape‑selectivity is critical. Emerging biocatalytic routes—using lipases engineered for hydrogenation—represent a marginal yet growing niche, driven by sustainability mandates and premium product positioning. The distribution of these catalyst types aligns with application‑specific performance criteria, thereby shaping the overall market composition.