Study on the catalytic oxidation mechanism of acetone over rod-like SBA-15supported palladium-cobalt catalyst

WU Ya-ni; WANG Jing-jing; LIU Ji-chen; WAN Jia-lei; DANG Fan; AI Chun-li; MA Mu-di; JIANG Ze-yu

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China Environmental Science ›› 2025, Vol. 45 ›› Issue (9) : 4888-4895.

Air Pollution Control

Study on the catalytic oxidation mechanism of acetone over rod-like SBA-15supported palladium-cobalt catalyst

WU Ya-ni, WANG Jing-jing, LIU Ji-chen, WAN Jia-lei, DANG Fan, AI Chun-li, MA Mu-di, JIANG Ze-yu

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Abstract

Taking the well-structured rod-like SBA-15 as support, Pd₁Co_x/SBA-15 bimetallic catalysts with different palladium(Pd) and cobalt(Co) molar ratios were prepared by adjusting the Co content for acetone (C₃H₆O) catalytic oxidation. Among these, the Pd₁Co₁/SBA-15 catalyst was found to exhibit superior performance for the low-temperature oxidation of C₃H₆O, achieving 90% conversion at 220°C, along with high CO₂ selectivity and thermal stability. Characterization by SEM, XRD, FT-IR, and N₂ adsorption-desorption was conducted, and it was revealed that Pd₁Co₁/SBA-15 possessed the optimal Pd/Co ratio and a higher specific surface area, which were crucial for the stabilization and exposure of active sites. Further investigations using H₂-TPR, O₂-TPD, and XPS indicated that the primary active oxygen species in Pd₁Co_0.5/SBA-15 and Pd₁Co₃/SBA-15 were chemisorbed oxygen, while surface lattice oxygen was predominantly present in Pd₁Co₁/SBA-15. Moreover, the transformation of abundant active oxygen species in Pd₁Co₁/SBA-15 was significantly promoted. The reaction mechanism of acetone oxidation over Pd₁Co₁/SBA-15 was elucidated by in-situ infrared spectroscopy. The decomposition path of acetone molecules over Pd₁Co₁/SBA-15 catalyst was determined as C₃H₆O→CH₃CH₂OH→CH₃COO^-→COO^-→CO₂, which further indicated that enhanced surface lattice oxygen can significantly accelerate activation and cleavage during the acetone oxidation process.

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rod-like SBA-15 / bimetallic catalyst / acetone / catalytic oxidation / active oxygen species

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WU Ya-ni, WANG Jing-jing, LIU Ji-chen, WAN Jia-lei, DANG Fan, AI Chun-li, MA Mu-di, JIANG Ze-yu. Study on the catalytic oxidation mechanism of acetone over rod-like SBA-15supported palladium-cobalt catalyst[J]. China Environmental Science. 2025, 45(9): 4888-4895

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