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Cheng X, Liu Y, Yang L, Yang M, Zhang Y, Ma C, Meng X, Xu J, Wang J, Qiao W. Understanding structure-performance relationships of CoO x/CeO 2 catalysts for NO catalytic oxidation: Facet tailoring and bimetallic interface designing. JOURNAL OF HAZARDOUS MATERIALS 2023; 451:131144. [PMID: 36921412 DOI: 10.1016/j.jhazmat.2023.131144] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/21/2023] [Accepted: 03/02/2023] [Indexed: 06/18/2023]
Abstract
Crystalline structure and bimetallic interaction of metal oxides are essential factors to determine the catalytic activity. Herein, three different CoOx/CeO2 catalysts, employing CeO2 nanorods (predominately exposed {110 facet), CeO2 nanopolyhedra ({111} facet) and CeO2 nanocubes ({100} facet) as the supports, are successfully prepared for investigating the effect of exposed crystal facets and bimetallic interface interaction on NO oxidation. In comparison with the {111} and {100} facets, the exposed crystal facet {110} exists the best superiority to anchor and stabilize Co species. Moreover, ultra-small CoOx clusters composed of strong Co-O coordination shells with minor Co-O-Ce interaction are formed and uniformly dispersed on the CeO2 nanorods. Structural characterizations reveal that the active exposed crystal facet {110} and the strong bimetallic interface interaction in CoOx/CeO2-nanorods (R-CC) result in more structural defect, endowing it with abundant oxygen vacancies, excellent reducibility and strong adsorption capacity. The DRIFTs spectra further indicate that the exposed crystal facet {110} has a significant promoting effect on the strength of nitrates compared with {111} and {100} facets. The bimetallic interface interaction not only significantly facilitates the formation of nitrate species at lower temperature, but also effectively suppresses the generation of sulfate and lower the sulphation rate. Therefore, R-CC catalyst exhibits the maximum NO oxidation activity with the conversion of 86.4 % at 300 °C and still sustains its high activity under cyclic condition or 50 ppm SO2. The provided crystalline structure and interaction-enhanced strategy sheds light on the design of high-activity NO oxidation catalysts.
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Affiliation(s)
- Xiaomin Cheng
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yiqi Liu
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Lubin Yang
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Mingjie Yang
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yongzheng Zhang
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Cheng Ma
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Xuan Meng
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Jing Xu
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Jitong Wang
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Wenming Qiao
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
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Chen L, Zhang C, Li Y, Chang CR, He C, Lu Q, Yu Y, Duan P, Zhang Z, Luque R. Hierarchically Hollow MnO 2@CeO 2 Heterostructures for NO Oxidation: Remarkably Promoted Activity and SO 2 Tolerance. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01578] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lei Chen
- School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People’s Republic of China
| | - Chen Zhang
- School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People’s Republic of China
| | - Yuxin Li
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People’s Republic of China
| | - Chun-Ran Chang
- School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People’s Republic of China
| | - Chi He
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People’s Republic of China
| | - Qiang Lu
- National Engineering Laboratory for biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, People’s Republic of China
| | - Yunsong Yu
- School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People’s Republic of China
| | - Peigao Duan
- School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People’s Republic of China
| | - Zaoxiao Zhang
- School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People’s Republic of China
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People’s Republic of China
| | - Rafael Luque
- Departamento de Química Orgánica, Universidad de Córdoba, Campus de Rabanales,
Edificio Marie Curie (C-3), Ctra Nnal IV-A, Km 396, E14014 Córdoba, Spain
- Peoples Friendship University of Russia (RUDN University), 6 Miklukho Maklaya str., 117198 Moscow, Russian Federation
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Mn-N-C Nanostructure Derived from MnO2-x/PANI as Highly Performing Cathode Additive in Li-S Battery. REACTIONS 2021. [DOI: 10.3390/reactions2030017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Highly dispersed Mn metallic nanoparticles (15.87 nm on average) on a nitrogen-doped porous carbon matrix were prepared by thermal treatment of MnO2-x/polyaniline (PANI), which was derived from the in situ polymerization of aniline monomers initiated by γ-MnO2 nanosheets. Owing to the large surface area (1287 m2/g), abundant active sites, nitrogen dopants and highly dispersed Mn sites on graphitic carbon, an impressive specific capacity of 1319.4 mAh g−1 with an admirable rate performance was delivered in a Li-S battery. After 220 cycles at 1 C, 80.6% of the original capacity was retained, exhibiting a good cycling stability.
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The study of MnO2 with different crystalline structures for U(VI) elimination from aqueous solution. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116296] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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