Crystal Plane Effect of Co3O4 on Styrene Catalytic Oxidation: Insights into the Role of Co3+ and Oxygen Mobility at Diverse Temperatures

被引:14
作者
Chen, Yinye [1 ]
Zhang, Zhen [1 ]
Wang, Xin [1 ]
Lin, Yidian [1 ]
Zuo, Jiachang [1 ,3 ]
Yang, Xuhui [1 ]
Chen, Songhua [2 ]
Luo, Yongjin [1 ]
Qian, Qingrong [1 ]
Chen, Qinghua [1 ]
机构
[1] Fujian Normal Univ, Fujian Key Lab Pollut Control & Resource Reuse, Fuzhou 350007, Peoples R China
[2] Longyan Univ, Coll Chem & Mat Sci, Longyan 364012, Fujian, Peoples R China
[3] Xiamen Univ, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Natl Engn Lab Green Chem Prod Alcohols Ethers Este, Xiamen 361005, Peoples R China
关键词
catalytic styrene oxidation; Co3O4; crystal plane; varied determined factor; reaction mechanism; LATTICE OXYGEN; SURFACE; PERFORMANCE; VACANCIES; FORMALDEHYDE; DRIFTS; OXIDES; FOAM; CU;
D O I
10.1021/acsami.3c04731
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In the oxidation reaction of volatile organic compoundscatalyzedby metal oxides, distinguishing the role of active metal sites andoxygen mobility at specific preferentially exposed crystal planesand diverse temperatures is challenging. Herein, Co3O4 catalysts with four different preferentially exposed crystalplanes [(220), (222), (311), and (422)] and oxygen vacancy formationenergies were synthesized and evaluated in styrene complete oxidation.It is demonstrated that the Co3O4 sheet (Co3O4-I) presents the highest C8H8 catalytic oxidation activity (R (250 & DEG;C) = 8.26 & mu;mol g(-1) s(-1) and WHSV = 120,000 mL h(-1) g(-1)). Density functional theory studies reveal that itis difficult for the (311) and (222) crystal planes to form oxygenvacancies, but the (222) crystal plane is the most favorable for C8H8 adsorption regardless of the presence of oxygenvacancies. The combined analysis of temperature-programmed desorptionand temperature-programmed surface reaction of C8H8 proves that Co3O4-I possessesthe best C8H8 oxidation ability. It is proposedthat specific surface area is vital at low temperature (below 250 & DEG;C) because it is related to the amount of surface-adsorbed oxygenspecies and low-temperature reducibility, while the ratio of surfaceCo(3+)/Co2+ plays a decisive role at higher temperaturebecause of facile lattice oxygen mobility. In situ diffuse reflectanceinfrared Fourier spectroscopy and the O-18(2) isotopeexperiment demonstrate that C8H8 oxidation overCo(3)O(4)-I, Co3O4-S,Co3O4-C, and Co3O4-F is mainly dominated by the Mars-van Krevelen mechanism.Furthermore, Co3O4-I shows superior thermalstability (57 h) and water resistance (1, 3, and 5 vol % H2O), which has the potential to be conducted in the actual industrialapplication.
引用
收藏
页码:32404 / 32415
页数:12
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