Article
Chemistry, Physical
Pengfei Cao, Yan Zhang, FengJuan Song, Haitao Zhao, Cheng Heng Pang, Tao Wu
Summary: A series of Mn-doped CeO2-MoO3/gamma-Al2O3 catalysts were synthesized and it was found that the addition of Mn significantly improved the performance of the catalysts, with the best Hg-0 catalytic oxidation efficiency reaching 86%. The addition of Mn increased the concentration of oxygen vacancies on the catalyst surface, promoting the catalytic oxidation of mercury. Mn-doping also cracked the CeO2 crystal plane and generated more active sites at the interface.
APPLIED SURFACE SCIENCE
(2022)
Article
Energy & Fuels
Zijian Zhou, Lei Liu, Xiaowei Liu, Yue Zhou, Changqing Wang, Jingying Xu, Guozhang Chang, Minghou Xu
Summary: MnOx-based oxides are efficient catalysts for elemental mercury oxidation in flue gas, and combining with CeO2 or CeO2-ZrO2 enhances their catalytic activity. The new MnOx-CeO2-ZrO2 solid solution catalyst showed better Hg-0 oxidation performance compared to the MnOx/CeO2-ZrO2 supported catalyst. Mn4+ and surface active oxygen were identified as the active species in Hg-0 oxidation reactions, and SO2 significantly inhibited the activity of MnOx/CeO2-ZrO2 but had less impact on MnOx-CeO2-ZrO2 solid solution.
Article
Engineering, Chemical
Hong Shen, Zijun Tang, Xiang Xiao, Haiwen Wu, Hang Zhou, Ping Fang, Dingfang Zhu, Jianhua Ge
Summary: In this study, a Mn-Ce/Al2O3/TiO2 catalyst prepared by impregnation method was used for synergistic O-3 oxidation of NO. The catalyst showed the best performance with a Mn:Ce molar ratio of 4:1, resulting in a significant increase in NO removal rate and efficiency.
Article
Engineering, Environmental
Can Li, Vishnu Sriram, Joo-Youp Lee
Summary: In this study, the impact of HCl and NH3 on Hg(0) oxidation catalytic reaction was investigated through real-time Hg(0) oxidation experiment and X-ray Absorption Near-Edge Structure analysis. The research revealed that Hg(0) oxidation is influenced by the combined action of HCl and O-2. HgCl2 was identified as the major mercury species formed on the spent catalyst under typical flue gas conditions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Xiaopeng Zhang, Xiangkai Han, Yuying Wei, Xinxin Wang, Ning Zhang, Junjiang Bao, Gaohong He
Summary: The Co-based catalyst Co-2.5-SAs@NC, with single Co atoms in an aggregation state, has shown promising results in efficiently converting gaseous oxygen into chemisorbed oxygen and achieving nearly 100% Hg-0 oxidation efficiency at low temperatures. This catalyst has the potential to be a viable option for Hg-0 oxidation from flue gas due to its highly coordinated unsaturated state and excellent ability to transform gaseous oxygen into chemisorbed oxygen.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Pelin Misiroglu Varol, Alattin Cakan, Burcu Kiren, Nezihe Ayas
Summary: This study investigates the use of potassium hydroxide (KOH) impregnated alumina catalysts for biodiesel production. The catalysts were prepared with different configurations and tested under various conditions. The results showed that a catalyst with 30 wt.% KOH content, calcined at 400 degrees C for 3 h, achieved a FAMEs content of 97.30% (conversion). The transesterification reaction was carried out using a microwave heating system, with a temperature of 65 degrees C, catalyst loading of 3 wt.%, methanol to oil molar ratio of 12:1, and a reaction duration of 35 min.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Engineering, Environmental
Jianqiang Shi, Zhen Wang, Jinxing Mi, Hao Liu, Bing Wang, Haiyan Liu, Jiancheng Wang, Jianjun Chen, Junhua Li
Summary: Ce-modified commercial vanadium-based catalysts are still being rapidly developed to optimize Hg0 oxidation performance. The introduction mode of Ce on Hg0 oxidation is still unclear. Introducing Ce as a promoter (VCe/Ti) to vanadium-based catalysts plays a more effective role in Hg0 oxidation than doping Ce into TiO2 support (V/CeTi). The excellent performance of the VCe/Ti catalyst is attributed to its redox ability, HCl adsorption capacity, surface oxygen vacancies, and redox equilibrium, which improve electron transfer and catalytic activity. This work offers the potential application of Ce-modified V-based catalysts for simultaneous control of NOx and Hg0 in stationary sources.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Review
Chemistry, Physical
Chao Peng, Di Yu, Lanyi Wang, Xuehua Yu, Zhen Zhao
Summary: This paper discusses the application and research of Mn-based oxides in dealing with air pollutants, emphasizing the importance of catalytic oxidation technology in this field. The development of efficient low-cost catalysts with special morphologies is crucial for the effective removal of air pollutants.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Engineering, Environmental
Bo Yuan, Zhen Qian, Xiaojie Yang, Mengchao Luo, Xiaohe Feng, Le Fu, Weijie Yang, Lijuan Yang, Jinghong Zhang, Yi Zhao, Runlong Hao
Summary: A novel microwave catalytic oxidation method for denitrification was developed, which can effectively convert NO to nitrate/nitrite with minimal NO2 yield. The use of a molecular sieve-supported oxygen-vacancy-enriched catalyst and microwave irradiation results in excellent catalytic activity and resistance.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Haitao Zhao, Pengfei Cao, Lu Lu, Fanghua Li, Cheng Heng Pang, Tao Wu
Summary: CeO2-based catalysts show high efficiency in catalytic oxidation of Hg-0, with the synergistic interactions between Ce and Mo facilitating the formation of defect-containing surface sites. Regulating the dispersion, exposure, and defect sites on CeO2(111) surface provides a feasible approach to enhancing the oxidation of Hg-0 for efficient removal of environmental pollutants.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Yudong Yang, Zhongtang Zhang, Yuhu Li, Ruixiang Wang, Zhifeng Xu, Chengyong Jin, Guizhong Jin
Summary: A novel process of catalytic aerial oxidation of As(III) using air as oxidant and Mn-loaded diatomite as catalyst has been proposed. The results show that Mn-loaded diatomite achieved a good catalytic effect for the aerial oxidation of As(III) and maintained high performance over multiple cycles of reuse.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Chemistry, Multidisciplinary
Dajie Yang, Fanbin Meng, Zhuoran Zhang, Xiang Liu
Summary: This study investigates the application of CexMn(1-x )O(2) metal oxides loaded on Al2O3 catalysts (Mn-Ce/Al2O3) in catalytic ozonation for the degradation of ciprofloxacin in wastewater. The results show that the use of Mn-Ce/Al2O3 catalyst significantly enhances the degradation efficiency of ciprofloxacin and increases the reaction rate by 3 times compared to ozone alone.
Article
Energy & Fuels
Nawaf M. Alghamdi, S. Mani Sarathy
Summary: In this study, the partial and total oxidation of dimethyl ether (DME) over 5 wt% Rh/Al2O3 catalyst at low temperatures was investigated. The effects of temperature, flow rate, and inlet feed composition on the reactivity were studied. The experimental data provided valuable information for accurate kinetic modeling, reactor design and optimization, and rational catalyst design.
Article
Chemistry, Applied
Yan Zeng, Tian Chen, Xu Zhang, Ying Chen, Hongwei Zhou, Lei Yu
Summary: Mesoporous Mn-Se/Al2O3 catalyst was easily prepared by calcining selenium sources with manganese and aluminum hydroxides. It exhibited high efficiency in alcohol oxidation using H2O2 as the oxidant, yielding carbonyl compounds in 58%-83% yields. The catalyst selectively produced aldehydes from primary alcohols without generating carboxylic acids. The easily accessible features and low cost of Mn-Se/Al2O3 make it highly promising for industrial-scale applications.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Engineering, Environmental
Yongpeng Ma, Tengfei Xu, Ling Li, Jiandong Wang, Yu Li, Hongzhong Zhang
Summary: The study found that α-Fe2O3/SnO2 binary oxides have high efficiency in removing gaseous elemental mercury, especially at high temperatures, with involvement of O-2. SO2 and H2O vapor can reduce the removal efficiency, while the presence of HCl greatly enhances it. The mechanisms of removal involve catalytic oxidation and adsorption processes, with involvement of Fe3+, O2-, Sn4+, and Sn2+.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
