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Photothermal catalytic hydrolysis of COS with enhanced efficiency over constructed alkali-modified La-Ti catalyst: Adjusting photogenerated electron behavior through metal‐support interactions.
- Source :
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Separation & Purification Technology . Dec2023, Vol. 327, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
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Abstract
- [Display omitted] • The TOF value increases from 4.84 × 10-4 s−1 (TiO 2 , thermal treatment) to 8.43 × 10-4 s−1 (La-Ti@K, photothermal treatment) at 60 °C, with H 2 S selectivity over 99%. • An electron-metal-support interaction (EMSI) exists between the electron-rich La and TiO 2. • The introduction of lanthanum improved the energy band structure of La-Ti@K and reduced the free energy of the photothermal hydrolysis reaction. • Thiocarbonate(HSCO 2 -) is the main intermediate of photothermal hydrolysis reaction. The low-temperature conversion of corrosive carbonyl sulfide (COS) in steel by-product gas is essential for the clean utilization of this gas. Herein, La-Ti@K catalysts doped with La nanoparticles were shown to exhibit significant photopromoted thermocatalytic activity and stability under UV light irradiation. At a reaction temperature of 60 °C, the TOF value increased from 4.84 × 10-4 s−1 (TiO 2 , thermal treatment) to 8.43 × 10-4 s−1 (La-Ti@K, photothermal treatment), and the H 2 S selectivity exceeded 99%. This was because La doping increased the density of basic sites on TiO 2 , which promoted the continuous dissociation of H 2 O in the system and the regeneration of –OH under UV irradiation. Moreover, the photogenerated electrons from TiO 2 were transferred to La to maintain the metallic La nanoparticles, as well as to ensure the activation and photothermal hydrolysis of COS. The presence of a suitable electron-metal-support interaction (EMSI) between the electron-rich La nanoparticles and TiO 2 might be responsible for these phenomena. In addition, theoretical calculations revealed that light-induced electron transfer was conducive to H 2 O dissociation and COS activation, while La doping reduced the free energy of the hydrolysis reaction. This work demonstrates the effectiveness of La-Ti@K catalyst in COS photothermal hydrolysis and provides a theoretical basis for further understanding of the photothermal catalytic mechanism. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13835866
- Volume :
- 327
- Database :
- Academic Search Index
- Journal :
- Separation & Purification Technology
- Publication Type :
- Academic Journal
- Accession number :
- 173117288
- Full Text :
- https://doi.org/10.1016/j.seppur.2023.124884