2019 Fiscal Year Research-status Report
Developing efficient catalysts for elimination of ammonia at room temperature for air quality improvement
| Project/Area Number |
19K15363
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
林 明月 首都大学東京, 都市環境科学研究科, 特任助教 (30813357)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | catalytic oxidation / ammonia / niobium oxide / precious metals / acid sites / nitrogen selectivity |
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| Outline of Annual Research Achievements |
Research Achievements:
(1) The preparation method of the developed Au/Nb2O5 catalysts has been studied in detail. Model reaction of CO oxidation was used for this investigation. Small amount of remaining sulfur species was found to be vital for small size of Au nanoparticles when using thiolate-protected gold colloid to prepare Au/Nb2O5 catalysts. This work has been accepted in Journal of Catalysis (https://doi.org/10.1016/j.jcat.2020.05.014).
(2) Except for Au catalysts, Pt/Nb2O5 and Pd/Nb2O5 have been screened out to be active and selective for NH3 oxidation. Important effect of Bronsted acid sites in N2 selectivity has been pointed out by utilizing the NaOH to block the Bronsted acid sites of Nb2O5. This work has been submitted to Journal of Catalysis and now is under revision.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The research is proceeding rather steadily as planned. In addition to Au/Nb2O5, Pt/Nb2O5 and Pd/Nb2O5 were screened out to be the active and selective catalysts for selective catalytic oxidation of ammonia. The important effect of acid sites of Nb2O5 has been investigated in detail. In the research plan, screening or designing of high surface acidity metal oxides for selective catalytic oxidation of ammonia was not proceeding smoothly because it is difficult to deposit highly dispersed gold nanoparticles on them, such as W-Ti-O, MoO3, WO3, V2O5. Therefore, the catalytic performances of these catalysts were not ideal. We will continue to develop the suitable preparation methods for acidic metal oxides supported gold catalysts.
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| Strategy for Future Research Activity |
Future research plan will be focused on three points:
(1) Investigating the water effect of the developed Au/Nb2O5, Pt/Nb2O5, and Pd/Nb2O5 on selective catalytic oxidation of NH3 for practical applications.
(2) Developing functional metal oxides by utilizing the feature of acid sites for selective catalytic oxidation of NH3.
(3) Detailed reaction mechanism studies for better understanding this reaction and for developing new functional materials.
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Research Products
(8 results)
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[Journal Article] Ultra-Low-Temperature CO Oxidation Activity of Octahedral Site Cobalt Species in Co3O4 Based Catalysts: Unravelling the Origin of the Unique Catalytic Property2019
Author(s)
Baidya T, Murayama T, Nellaiappan S, Katiyar NK, Bera P, Safonova O, Lin M, Priolkar KR, Kundu S, Srinivasa Rao B, Steiger P.
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Journal Title
The Journal of Physical Chemistry C
Volume: 123
Pages: 19557
DOI
Peer Reviewed / Int'l Joint Research
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