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Lu X, Dang Y, Li M, Zhu C, Liu F, Tang W, Weng J, Ruan M, Suib SL, Gao PX. Synergistic promotion of transition metal ion-exchange in TiO 2 nanoarray-based monolithic catalysts for the selective catalytic reduction of NO x with NH 3. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00996j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The improved performance of the multi-component Cu–Ce–Mn/TNA catalysts over the mono-metallic catalysts demonstrated the synergistic promotion of multi-transition-metal-doped nanoarray catalysts for efficient NO abatement.
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Affiliation(s)
- Xingxu Lu
- Department of Materials Science and Engineering, University of Connecticut, Storrs, CT 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Yanliu Dang
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Meilin Li
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA
| | - Chunxiang Zhu
- Department of Materials Science and Engineering, University of Connecticut, Storrs, CT 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Fangyuan Liu
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Wenxiang Tang
- Department of Materials Science and Engineering, University of Connecticut, Storrs, CT 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Junfei Weng
- Department of Materials Science and Engineering, University of Connecticut, Storrs, CT 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Mingyue Ruan
- Department of Materials Science and Engineering, University of Connecticut, Storrs, CT 06269, USA
| | - Steven L. Suib
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA
| | - Pu-Xian Gao
- Department of Materials Science and Engineering, University of Connecticut, Storrs, CT 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
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Lu X, Li M, Hoang S, Suib SL, Gao PX. Solvent effects on the heterogeneous growth of TiO2 nanostructure arrays by solvothermal synthesis. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.02.044] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Lu X, Tang W, Du S, Wen L, Weng J, Ding Y, Willis WS, Suib SL, Gao PX. Ion-Exchange Loading Promoted Stability of Platinum Catalysts Supported on Layered Protonated Titanate-Derived Titania Nanoarrays. ACS APPLIED MATERIALS & INTERFACES 2019; 11:21515-21525. [PMID: 31132239 DOI: 10.1021/acsami.9b04378] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Supported metal catalysts are one of the major classes of heterogeneous catalysts, which demand good stability in both the supports and catalysts. Herein, layered protonated titanate-derived TiO2 (LPT-TiO2) nanowire arrays were synthesized to support platinum catalysts using different loading processes. The Pt ion-exchange loading on pristine LPTs followed by thermal annealing resulted in superior Pt catalysts supported on the LPT-TiO2 nanoarrays with excellent hydrothermal stability and catalytic performance toward CO and NO oxidations as compared to the Pt catalysts through wet-impregnation on the anatase TiO2 (ANT-TiO2) nanoarrays resulted from thermal annealing of LPT nanoarrays. Both loading processes resulted in highly dispersed Pt nanoparticles (NPs) with average sizes smaller than 1 nm at their pristine states. However, after hydrothermal aging at 800 °C for 50 h, highly dispersed Pt NPs were only retained on the ion-exchanged LPT-TiO2 nanoarrays with the support structure consisting of a mixture of 74% anatase and 26% rutile TiO2. For the wet-impregnation loading directly on anatase TiO2 nanoarrays derived from LPT, the Pt catalysts experienced severe agglomeration after hydrothermal aging, with the nanoarray supports consisting of 86% anatase and 14% rutile TiO2. Spectroscopy analysis suggested that Pt2+ cations intercalated into the interlayers of the titanate frameworks through ion-exchange impregnation procedure, which altered the chemical and electronic structures of the catalysts, resulting in the shifts of the electronic binding energy, Raman bands, and optical energy bandgap. The ion-exchangeable nature of LPT nanoarrays clearly provides a structural modification in Pt-doped LPT that has resulted in a strong interaction between the Pt catalysts and LPT-TiO2 nanoarray supports, leading to the enhanced hydrothermal stability of the catalysts. Considering the wide applications of the LPT and TiO2 nanomaterials as supports for catalysts, this finding provides a new pathway to design highly stable supported metal catalysts for different reactions.
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Affiliation(s)
| | | | | | | | | | - Yong Ding
- School of Materials Science and Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
| | - William S Willis
- Department of Chemistry , University of Connecticut , Storrs , Connecticut 06269-3060 , United States
| | - Steven L Suib
- Department of Chemistry , University of Connecticut , Storrs , Connecticut 06269-3060 , United States
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