PBA-derived high-efficiency iron-based catalysts for CO2 hydrogenation

Abstract

The efficient utilization of CO₂ is currently a major concern, and the preparation of a catalyst with high CO₂ conversion and product selectivity has become a matter of interest for researchers. Here, we report a series of transition metal-doped CO₂ hydrogenation catalysts MFe₂O₄ (M = Zn, Cu, Ni, Co) with K residue prepared by using PBA as the precursor. The physicochemical properties of the catalysts were characterized by XRD, SEM, TEM, XPS, N₂ adsorption and desorption, and H₂-TPR, and the catalytic performance was tested. The test results showed that ZnFe₂O₄ had the highest CO₂ conversion of 57.39% and the highest C₅₊ yield of 39.30% at 320 °C, 3 MPa, H₂/CO₂ = 3 : 1 and space velocity of 12 000 mL g⁻¹ h⁻¹. ZnFe₂O₄ showed no significant deactivation after 32 h of continuous operation, indicating its potential as an industrial catalyst.