Synergistic Effects of Bimetallic AuPd and La<sub>2</sub>O<sub>3</sub> in the Catalytic Reduction of NO with CO
Bimetallic AuPd nanoparticles supported on TiO<sub>2</sub> are known to catalyze the reduction of NO with CO. Here, we investigated the effects of the addition of lanthanum oxide to a AuPd/TiO<sub>2</sub> catalyst with a AuPd particle size of 2.1–2.2 nm. The addition of La<...
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MDPI AG
2021-07-01
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| Online Access: | https://www.mdpi.com/2073-4344/11/8/916 |
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| author | Xianwei Wang Nobutaka Maeda Daniel M. Meier |
| author_facet | Xianwei Wang Nobutaka Maeda Daniel M. Meier |
| author_sort | Xianwei Wang |
| collection | DOAJ |
| description | Bimetallic AuPd nanoparticles supported on TiO<sub>2</sub> are known to catalyze the reduction of NO with CO. Here, we investigated the effects of the addition of lanthanum oxide to a AuPd/TiO<sub>2</sub> catalyst with a AuPd particle size of 2.1–2.2 nm. The addition of La<sub>2</sub>O<sub>3</sub> enhanced the catalytic activity; for example, at 250 °C, there was 40.9% NO conversion and 49.3% N<sub>2</sub>-selectivity for AuPd/TiO<sub>2</sub>, and 100% NO conversion and 100% N<sub>2</sub>-selectivity for AuPd-La (1:1)/TiO<sub>2</sub>. The temperature requiring 100% NO conversion dropped from 400 °C to 200 °C by the simple post-impregnation of La<sub>2</sub>O<sub>3</sub> onto AuPd/TiO<sub>2</sub>. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with modulation excitation spectroscopy (MES) demonstrated that CO adsorption occurs first on Au atoms and then, within 80 s, moves onto Pd atoms. This transformation between two adsorption sites was facilitated by the addition of La<sub>2</sub>O<sub>3</sub>. |
| first_indexed | 2024-03-10T08:56:17Z |
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| language | English |
| last_indexed | 2024-03-10T08:56:17Z |
| publishDate | 2021-07-01 |
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| spelling | doaj.art-2c5a419cb2394b0790c3186dcf7446b12023-11-22T07:06:40ZengMDPI AGCatalysts2073-43442021-07-0111891610.3390/catal11080916Synergistic Effects of Bimetallic AuPd and La<sub>2</sub>O<sub>3</sub> in the Catalytic Reduction of NO with COXianwei Wang0Nobutaka Maeda1Daniel M. Meier2Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, ChinaInstitute of Materials and Process Engineering (IMPE), School of Engineering (SoE), Zurich University of Applied Sciences (ZHAW), CH-8400 Winterthur, SwitzerlandInstitute of Materials and Process Engineering (IMPE), School of Engineering (SoE), Zurich University of Applied Sciences (ZHAW), CH-8400 Winterthur, SwitzerlandBimetallic AuPd nanoparticles supported on TiO<sub>2</sub> are known to catalyze the reduction of NO with CO. Here, we investigated the effects of the addition of lanthanum oxide to a AuPd/TiO<sub>2</sub> catalyst with a AuPd particle size of 2.1–2.2 nm. The addition of La<sub>2</sub>O<sub>3</sub> enhanced the catalytic activity; for example, at 250 °C, there was 40.9% NO conversion and 49.3% N<sub>2</sub>-selectivity for AuPd/TiO<sub>2</sub>, and 100% NO conversion and 100% N<sub>2</sub>-selectivity for AuPd-La (1:1)/TiO<sub>2</sub>. The temperature requiring 100% NO conversion dropped from 400 °C to 200 °C by the simple post-impregnation of La<sub>2</sub>O<sub>3</sub> onto AuPd/TiO<sub>2</sub>. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with modulation excitation spectroscopy (MES) demonstrated that CO adsorption occurs first on Au atoms and then, within 80 s, moves onto Pd atoms. This transformation between two adsorption sites was facilitated by the addition of La<sub>2</sub>O<sub>3</sub>.https://www.mdpi.com/2073-4344/11/8/916bimetallic AuPdin situ DRIFTSLa<sub>2</sub>O<sub>3</sub>modulation excitation spectroscopyNO reduction with CO |
| spellingShingle | Xianwei Wang Nobutaka Maeda Daniel M. Meier Synergistic Effects of Bimetallic AuPd and La<sub>2</sub>O<sub>3</sub> in the Catalytic Reduction of NO with CO Catalysts bimetallic AuPd in situ DRIFTS La<sub>2</sub>O<sub>3</sub> modulation excitation spectroscopy NO reduction with CO |
| title | Synergistic Effects of Bimetallic AuPd and La<sub>2</sub>O<sub>3</sub> in the Catalytic Reduction of NO with CO |
| title_full | Synergistic Effects of Bimetallic AuPd and La<sub>2</sub>O<sub>3</sub> in the Catalytic Reduction of NO with CO |
| title_fullStr | Synergistic Effects of Bimetallic AuPd and La<sub>2</sub>O<sub>3</sub> in the Catalytic Reduction of NO with CO |
| title_full_unstemmed | Synergistic Effects of Bimetallic AuPd and La<sub>2</sub>O<sub>3</sub> in the Catalytic Reduction of NO with CO |
| title_short | Synergistic Effects of Bimetallic AuPd and La<sub>2</sub>O<sub>3</sub> in the Catalytic Reduction of NO with CO |
| title_sort | synergistic effects of bimetallic aupd and la sub 2 sub o sub 3 sub in the catalytic reduction of no with co |
| topic | bimetallic AuPd in situ DRIFTS La<sub>2</sub>O<sub>3</sub> modulation excitation spectroscopy NO reduction with CO |
| url | https://www.mdpi.com/2073-4344/11/8/916 |
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