Work

Alkaline-earth-promoted Pd–Ag/Al2O3 for selective acetylene hydrogenation: green-oil mitigation, ethylene selectivity, and implications for hydrogen spillover

Year: 2026

Type: article

Abstract: Removing trace acetylene from ethylene streams is critical to protect Ziegler–Natta polymerization. Eggshell Pd–Ag/θ-Al2O3 spheres (0.03 wt% Pd, 0.13 wt% Ag) were promoted with 1 wt% alkaline-earth additives to suppress green oil and improve ethylene selectivity. XRD, N2 physisorption, H2-TPR, NH3/CO2-TPD, TPO, SEM–EDS, and ICP-OES established structure-property links. Fixed-bed tests (10 bar, 40–60 °C) after H2 prereduction showed promoter-stabilized θ-Al2O3, higher surface area and mesoporosity and stronger metal-support interactions. All promoted catalysts achieved ≳ 96% acetylene conversion with higher ethylene selectivity and reduced carbon deposition. A possible contribution from hydrogen spillover is discussed qualitatively based on indirect evidence.

Source: Scientific Reports

DOI: 10.1038/s41598-026-46044-5

Authors: Farnaz Rahbar Shamskar, Sajad Mobini, Mehran Rezaei

Institutions: Iran University of Science and Technology, University of Kashan

Language: English

Topic: Nanomaterials for catalytic reactions

Subfield: Organic Chemistry

Field: Chemistry

Domain: Physical Sciences

SDGs: Responsible consumption and production, Affordable and clean energy

Open Access status: gold

Estimated APC paid: $2,690