Review
Environmental Sciences
David Murindababisha, Abubakar Yusuf, Yong Sun, Chengjun Wang, Yong Ren, Jungang Lv, Hang Xiao, George Zheng Chen, Jun He
Summary: This paper reviews the recent progress in catalysts for toluene oxidation and discusses the factors influencing their catalytic activities, as well as the reaction mechanisms and kinetics for catalytic oxidation of toluene.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Review
Environmental Sciences
Pijun Gong, Feng He, Junlin Xie, De Fang
Summary: Volatile organic compounds (VOCs) pose serious threats to human health and the ecological environment. Catalytic oxidation technology, due to its cost-effectiveness and high activity, is considered the most effective method for removing VOCs. This review summarizes the research progress in the catalytic oxidation of toluene using MnO2-based catalysts, including single MnO2, metal-doped MnO2, and supported MnO2 catalysts. The relationship between the chemical properties of MnO2 catalysts and toluene oxidation performance, as well as the catalytic reaction mechanisms, are focused on. Additionally, the effects of different crystal forms and morphologies on the catalytic toluene reaction are discussed, and the potential of MnO2 catalysts for the catalytic oxidation of toluene is proposed. The summary of these important findings is expected to serve as a valuable reference for the catalytic treatment of VOCs.
Article
Chemistry, Physical
Songlin Han, Yaqiu Tao, Yunfei Liu, Yinong Lu, Zhigang Pan
Summary: Porous LaFeO3 powders were obtained via high-temperature calcination of LaFeO3 precursors produced by hydrothermal treatment of corresponding nitrates in the presence of citric acid. Monolithic LaFeO3 was prepared by extrusion of four different LaFeO3 powders calcinated at different temperatures mixed with kaolinite, carboxymethyl cellulose, glycerol, and active carbon. The catalyst calcinated at 700 degrees C showed the best catalytic activity for the oxidation of toluene, with a catalytic rate of 36,000 mL/(g·h), and its superior performance was attributed to the larger specific surface area, higher oxygen adsorption, and larger Fe2+/Fe3+ ratio associated with LaFeO3 calcined at 700 degrees C.
Article
Chemistry, Physical
Shaohua Chen, Yu Hao, Rui Chen, Zhipeng Su, Tiehong Chen
Summary: The hollow multishelled spherical PrMnO3 perovskite exhibits high catalytic activity due to its high specific surface area, high molar ratio of Mn4+/Mn3+, improved low-temperature reducibility, and increased content of active oxygen species. Its excellent catalytic performance for CO and toluene oxidation is attributed to the unique structural and compositional characteristics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Shuangju Li, Li Xu, Chao Feng, Qingyang Li, Junxiang Jiang, Daotong Liang, Panting Zhang, Chuanhui Zhang, Xuebing Li, Zhong Wang
Summary: Co-based catalysts have attracted attention for their excellent catalytic activity. Co catalysts supported on Nb2O5 showed the best activity and stability. The unique properties of monoclinic Nb2O5 supported the strong interaction between Nb2O5 and Co3O4, leading to enhanced adsorption and activation ability of toluene and oxygen molecules on the catalyst. This study reveals the support effect of Co supported catalyst, which has guiding significance for industrial application.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Environmental
Zhengfeng Gu, Daiwei Liu, Mengnan Yu, Teng Bao, Xiaowei Liu, Ling Zhang, Haitao Ding, Zhimin Yu, Chengxun Deng
Summary: This study successfully synthesized Ni-Cu-loaded TiO2 catalysts with excellent catalytic activity and stability by controlling the molar ratio of Ni/Cu and the mass proportion of the TiO2 support. The 5Ni-Cu/TiO2 catalyst exhibited improved pore sizes and specific surface area, higher concentrations of oxygen vacancies and adsorbed oxygen species, and good redox properties.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Hanlin Chen, Gaoling Wei, Zijuan You, Xiaoliang Liang, Peng Liu, Yiping Yang, Fuding Tan, Suhua Wang, Jieqi Xing, Steven L. Suib
Summary: For perovskite La1-xCaxCoO3 (Ca-x, x = 0-0.3), Ca-0.2 with the closest O p band center to the Fermi level, exhibits the highest catalytic activity for toluene oxidation. The O p band center plays a crucial role in determining reducibility and active oxygen content. This discovery is beneficial for designing highly active perovskite catalysts.
CHEMICAL COMMUNICATIONS
(2023)
Article
Engineering, Chemical
Huaxun Luo, Weida Chen, Jiaming Hu, Feng Zhang, Xingbang Hu
Summary: The biggest challenge in the selective oxidation of toluene to benzaldehyde is to prevent further oxidation of benzaldehyde as toluene conversion increases. By using benzyl benzoate as a solvent and adding benzoate as an alkalinity regulator, the formation of benzoyl radical can be inhibited, but the oxidation of toluene is weakened. The mechanism of alkaline regulation and selective oxidation of toluene was investigated by in situ infrared spectroscopy experiments.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Ruijie Yang, Zhongjie Guo, Lixin Cai, Rongshu Zhu, Yingying Fan, Yuefeng Zhang, Pingping Han, Wanjian Zhang, Xiangang Zhu, Qitong Zhao, Zhenye Zhu, Chak Keung Chan, Zhiyuan Zeng
Summary: This study investigates the catalytic activity of six types of MnO2 with different crystal phases towards toluene degradation, revealing that the crystal phase plays a crucial role in determining the catalytic activity. The research further demonstrates that the high catalytic activity of MnO2 is attributed to the abundant oxygen vacancies and strong mobility of oxygen species.
Article
Chemistry, Physical
Khadijah H. Alharbi, Ali Alsalme, Ahmed Bader A. Aloumi, Mohammed Rafiq H. Siddiqui
Summary: Mixed metal oxide CuxZnyO was synthesized and evaluated for its catalytic performance in toluene oxidation. The experimental results showed that controlling aging time, calcination temperature, reaction temperature, and feed rate is crucial for enhancing catalytic activity.
Article
Chemistry, Physical
Ruosi Peng, Haozhi Zhang, Yanjie Guo, Weiqing Huang, You Zhang, Junliang Wu, Mingli Fu, Chenglong Yu, Daiqi Ye
Summary: This study investigates the effect of lanthanide doping on the physicochemical properties and catalytic activity of Pt/CeO2 catalysts for toluene oxidation. The results demonstrate a significant impact of lanthanide doping on the catalyst activity, which is closely related to the ion radius and valence state of the dopants. Doping with Gd enhances the catalytic oxidation of toluene over Pt/CeO2 catalyst, possibly by promoting the formation of Gd-Ce complexes and oxygen vacancies.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Wei Long, Zhilong Chen, Yinfei Huang, Xinping Kang
Summary: A nanometer-size Co-ZIF catalyst was prepared for the selective oxidation of toluene to benzaldehyde under mild conditions. The catalyst showed excellent performance and could be effectively recycled for the oxidation reaction of toluene.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Physical
Yutong Wang, Niklas Teetz, Dirk Holtmann, Miguel Alcalde, Jacob M. A. van Hengst, Xiaoxiao Liu, Mengfan Wang, Wei Qi, Wuyuan Zhang, Frank Hollmann
Summary: In this study, we address the challenges of regio- and chemoselectivity in the biocatalytic oxidation reactions of toluene derivatives by combining reactant and reaction engineering. We demonstrate that the peroxygenase-catalysed transformation of ring-substituted toluenes exhibits high regioselectivity at the benzylic position. Furthermore, under neat reaction conditions, we achieve not only attractive product concentrations (up to 185 mM) but also highly chemoselective oxidations to the aldehyde level.
Article
Chemistry, Physical
Ning Dong, Mengyue Chen, Qing Ye, Dan Zhang, Hongxing Dai
Summary: The study demonstrated that the 5% Ni-loaded OMS-2 catalyst exhibited the best catalytic activity, attributed to its unique physicochemical properties and efficient oxidation capability for pollutants.
Article
Chemistry, Physical
Jian-Rong Li, Wan-Peng Zhang, Chang Li, Chi He
Summary: In this study, Mn-Cu bimetallic oxides with high catalytic activity were facilely prepared by a hydrothermal-redox method for toluene oxidation. The control of Cu/Mn molar ratio was found to tune the lattice defect and oxygen vacancy concentration in the prepared materials. Among them, spinel structured MnCu0.5 exhibited the highest catalytic activity and durability at 210 degrees C.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
