Abstract
The purpose of this study was to develop a structured perovskite-type oxide catalyst for the water gas shift (WGS) reaction, which could make lattice oxygen mobile at a low external heat energy by preparing it as a thin catalyst layer on a metal plate. The thickness of the formed LaCoO3 layer was about 20 μm, which was confirmed by FE-SEM and EDX analysis. For enhancing its WGS reaction performance, a palladium (Pd) component was supported on the structured catalyst using various Pd precursors. When using a PdCl2 aqueous solution which was prepared by filtration of the PdCl2 slurry (the filtration liquid), the Pd-supporting LaCoO3 structured catalyst showed a high and stable activity. The reason for such an enhanced activity was that the supported Pd was in a highly dispersed state, which was derived from the electrostatic interaction between [PdCl3(H 2O)]- as the anionic charged precursor in the filtration liquid and the oppositely charged LaCoO3 support surface confirmed by a UV-vis measurement. In order to remove the remaining chloride ligand from the Pd-supporting LaCoO3 catalyst surface, a washing treatment was performed by immersing the as-made catalyst in water, NH3 (aq) or NaOH (aq) at pH 11.5 for 30 min. Consequently, these washing processes were effective for eliminating the remaining chloride ion from the catalyst surface and improving the shift activity of the catalyst. The catalyst washed using NH3 (aq) showed the highest activity among these catalysts.
| Original language | English |
|---|---|
| Pages (from-to) | 75-82 |
| Number of pages | 8 |
| Journal | Applied Catalysis A: General |
| Volume | 477 |
| DOIs | |
| Publication status | Published - 2014 May 5 |
| Externally published | Yes |
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Keywords
- Perovskite-type oxide
- Structured catalyst
- Water gas shift reaction
ASJC Scopus subject areas
- Catalysis
- Process Chemistry and Technology
Cite this
Pd-supporting LaCoO3 catalyst with structured configuration for water gas shift reaction. / Watanabe, Ryo; Fujita, Yusuke; Tagawa, Tomohiro; Yamamoto, Kazumasa; Furusawa, Takeshi; Fukuhara, Choji.
In: Applied Catalysis A: General, Vol. 477, 05.05.2014, p. 75-82.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Pd-supporting LaCoO3 catalyst with structured configuration for water gas shift reaction
AU - Watanabe, Ryo
AU - Fujita, Yusuke
AU - Tagawa, Tomohiro
AU - Yamamoto, Kazumasa
AU - Furusawa, Takeshi
AU - Fukuhara, Choji
PY - 2014/5/5
Y1 - 2014/5/5
N2 - The purpose of this study was to develop a structured perovskite-type oxide catalyst for the water gas shift (WGS) reaction, which could make lattice oxygen mobile at a low external heat energy by preparing it as a thin catalyst layer on a metal plate. The thickness of the formed LaCoO3 layer was about 20 μm, which was confirmed by FE-SEM and EDX analysis. For enhancing its WGS reaction performance, a palladium (Pd) component was supported on the structured catalyst using various Pd precursors. When using a PdCl2 aqueous solution which was prepared by filtration of the PdCl2 slurry (the filtration liquid), the Pd-supporting LaCoO3 structured catalyst showed a high and stable activity. The reason for such an enhanced activity was that the supported Pd was in a highly dispersed state, which was derived from the electrostatic interaction between [PdCl3(H 2O)]- as the anionic charged precursor in the filtration liquid and the oppositely charged LaCoO3 support surface confirmed by a UV-vis measurement. In order to remove the remaining chloride ligand from the Pd-supporting LaCoO3 catalyst surface, a washing treatment was performed by immersing the as-made catalyst in water, NH3 (aq) or NaOH (aq) at pH 11.5 for 30 min. Consequently, these washing processes were effective for eliminating the remaining chloride ion from the catalyst surface and improving the shift activity of the catalyst. The catalyst washed using NH3 (aq) showed the highest activity among these catalysts.
AB - The purpose of this study was to develop a structured perovskite-type oxide catalyst for the water gas shift (WGS) reaction, which could make lattice oxygen mobile at a low external heat energy by preparing it as a thin catalyst layer on a metal plate. The thickness of the formed LaCoO3 layer was about 20 μm, which was confirmed by FE-SEM and EDX analysis. For enhancing its WGS reaction performance, a palladium (Pd) component was supported on the structured catalyst using various Pd precursors. When using a PdCl2 aqueous solution which was prepared by filtration of the PdCl2 slurry (the filtration liquid), the Pd-supporting LaCoO3 structured catalyst showed a high and stable activity. The reason for such an enhanced activity was that the supported Pd was in a highly dispersed state, which was derived from the electrostatic interaction between [PdCl3(H 2O)]- as the anionic charged precursor in the filtration liquid and the oppositely charged LaCoO3 support surface confirmed by a UV-vis measurement. In order to remove the remaining chloride ligand from the Pd-supporting LaCoO3 catalyst surface, a washing treatment was performed by immersing the as-made catalyst in water, NH3 (aq) or NaOH (aq) at pH 11.5 for 30 min. Consequently, these washing processes were effective for eliminating the remaining chloride ion from the catalyst surface and improving the shift activity of the catalyst. The catalyst washed using NH3 (aq) showed the highest activity among these catalysts.
KW - Perovskite-type oxide
KW - Structured catalyst
KW - Water gas shift reaction
UR - http://www.scopus.com/inward/record.url?scp=84897046491&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84897046491&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2014.03.005
DO - 10.1016/j.apcata.2014.03.005
M3 - Article
AN - SCOPUS:84897046491
VL - 477
SP - 75
EP - 82
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
SN - 0926-860X
ER -