Selective Deoxygenation of Palm Oil Into Green Diesel over NiO, Ru₂O₃, and NiRu2O4/Al2O3@Date Seed Catalysts

Why It Matters

Achieving near‑complete conversion of palm oil to diesel with a reusable catalyst lowers renewable fuel costs and supports global decarbonization goals.

Key Takeaways

• NiRu₂O₄/Al₂O₃@DS achieved 97.18% hydrocarbon yield
• Optimal conditions: 350 °C, 3 h, 5 wt% catalyst
• Synergistic Ni–Ru interaction boosts deoxygenation activity
• Catalyst retained performance over four reuse cycles

Pulse Analysis

Renewable diesel, often called green diesel, is gaining traction as a low‑carbon alternative to petroleum fuels. Palm oil, abundant in Southeast Asia, offers a high‑energy feedstock but contains oxygenated compounds that must be removed to meet diesel specifications. Deoxygenation processes—hydrodeoxygenation, decarboxylation, and decarbonylation—require efficient catalysts that can operate at moderate temperatures while minimizing hydrogen consumption. The study’s focus on a bio‑derived support (date‑seed‑derived Al₂O₃) aligns with circular‑economy principles, turning agricultural waste into a value‑added material for catalysis.

The catalyst design leverages the complementary properties of nickel and ruthenium. Nickel provides strong hydrogenation activity, whereas ruthenium excels at C–O bond cleavage. When combined into a mixed‑oxide NiRu₂O₄ phase and dispersed on an acidic Al₂O₃@DS matrix, the resulting material exhibits enhanced metal‑support interactions that promote selective deoxygenation pathways. The reported 97.18% hydrocarbon yield at 350 °C and a modest 5 wt% loading demonstrates that the synergistic effect translates into practical performance gains, outperforming the individual NiO or Ru₂O₃ counterparts.

From a commercial perspective, the catalyst’s stability over four consecutive cycles suggests a lower total cost of ownership compared with conventional precious‑metal catalysts. However, scaling the wet‑impregnation synthesis and ensuring consistent quality of the date‑seed support remain challenges for large‑scale deployment. Future work should address long‑term durability, catalyst regeneration, and life‑cycle emissions to validate the technology’s viability in the emerging green‑diesel market. If these hurdles are overcome, the NiRu₂O₄/Al₂O₃@DS system could accelerate the transition to renewable fuels derived from abundant tropical oils.