Exploring the rate-control step of toluene oxidation over the novel octahedral Pt/Mn 3 O 4 catalyst with stable low-temperature catalytic performance via in situ DRIFTS

被引：1
作者：
Fan, Jie [1 ]
Mao, Lutao [3 ]
Fu, Mingli [2 ]
Liu, Peng [2 ]
Wu, Zuliang [4 ]
Ye, Daiqi [2 ]
机构：
[1] Taiyuan Univ Sci & Technol, Sch Environm & Resources, Taiyuan 030024, Peoples R China
[2] South China Univ Technol, Sch Environm & Energy, Guangdong Prov Key Lab Atmospher Environm & Pollut, Guangzhou 510006, Peoples R China
[3] Taiyuan Univ Sci & Technol, Sch Mat Sci & Engn, Taiyuan 030024, Peoples R China
[4] Changzhou Univ, Sch Environm & Safety Engn, Adv Plasma Catalysis Engn Lab China Petrochem Ind, Changzhou 213164, Jiangsu, Peoples R China
来源：
MICROPOROUS AND MESOPOROUS MATERIALS | 2024年 / 375卷
关键词：
VOCs; Catalytic oxidation; Oxygen vacancy; In situ DRIFTS; CO; COMBUSTION; OXIDES; OXYGEN; DECOMPOSITION; COOXIDATION; INSIGHTS; PLASMA; IR;
D O I：
10.1016/j.micromeso.2024.113164
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The high efficiency and stability of catalysts are crucial for their practical application in toluene oxidation. Herein, a novel octahedral Pt/Mn 3 O 4 -110 catalyst with excellent structural stability was synthesized and 100 % toluene conversion can be achieved at low-temperature 160 degrees C. XRD and Raman results indicated that the structure of Pt/Mn 3 O 4 -110 can be well maintained after 120 h on-stream reaction, the resistance to H 2 O (3 or 5 vol%) and high concentration toluene (3000 ppm)/CO 2 (5 vol%) tests. In situ DRIFTS comparative studies between Pt/Mn 3 O 4 -110 and Pt/Mn 3 O 4 -100 (30 % toluene conversion at 160 degrees C) samples demonstrated that the rate-control steps of toluene oxidation on Pt/Mn 3 O 4 -110 and Pt/Mn 3 O 4 -100 were both the further oxidation of benzoate species in the presence of gas-phase oxygen, while the transformation of benzaldehyde to benzoate species was the rate-control step on Pt/Mn 3 O 4 -100 in the absence of gas-phase oxygen. The weaker Mn-O bonds, richer oxygen vacancies and higher mobility of oxygen species on Pt/Mn 3 O 4 -110 sample than that of Pt/Mn 3 O 4 - 100 are beneficial for the easier release of lattice oxygen from the surface of catalyst and then participated in toluene oxidation via Mars-van Krevelen mechanism, contributing to easier oxidation of benzaldehyde to benzoate species and formation of formic acid and bicarbonate species.
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页数：13
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