Nagoya University · Chemical Engineering
나가오카 카츠토시 교수의 연구실은 고온 예비 환원을 통해 활성화된 루테늄 기반 촉매를 중심으로, 온도와 압력 조건을 완화한 암모니아 합성 기술을 개발하고 있습니다. 특히 라운드, 프라세오디미움, 세리아 등 희토류 산화물 기반 지지체를 활용해 루테늄 촉매의 반응성과 내구성을 극대화하는 데 초점을 맞추고 있으며, 수소를 탄소 없이 효율적으로 생산할 수 있는 암모니아 분해 기반 에너지 시스템의 구현도 연구하고 있습니다. 이는 지속 가능한 에너지 시스템 구축을 위한 핵심 기술로 평가됩니다.
Figures are computed from collected data and may differ slightly.
Ammonia is an important feedstock for producing fertiliser and is also a potential energy carrier. However, the process currently used for ammonia synthesis, the Haber-Bosch process, consumes a huge amount of energy; therefore the development of new catalysts for synthesising ammonia at a high rate under mild conditions (low temperature and low pressure) is necessary. Here, we show that Ru/La<sub>0.5</sub>Ce<sub>0.5</sub>O<sub>1.75</sub> pre-reduced at an unusually high temperature (650 °C) cata
Ammonia is a crucial chemical feedstock for fertilizer production and is a potential energy carrier. However, the current method of synthesizing ammonia, the Haber-Bosch process, consumes a great deal of energy. To reduce energy consumption, a process and a substance that can catalyze ammonia synthesis under mild conditions (low temperature and low pressure) are strongly needed. Here we show that Ru/Pr<sub>2</sub>O<sub>3</sub> without any dopant catalyzes ammonia synthesis under mild conditions
Ammonia has been suggested as a carbon-free hydrogen source, but a convenient method for producing hydrogen from ammonia with rapid initiation has not been developed. Ideally, this method would require no external energy input. We demonstrate hydrogen production by exposing ammonia and O<sub>2</sub> at room temperature to an acidic RuO<sub>2</sub>/γ-Al<sub>2</sub>O<sub>3</sub> catalyst. Because adsorption of ammonia onto the catalyst is exothermic, the catalyst bed is rapidly heated to the catal
To exploit the use of hydrogen as a source of sustainable energy, development of an efficient process for synthesizing an energy carrier such as ammonia under mild conditions will be necessary. Here, we show that Ru/La0.5Pr0.5O1.75 prereduced at an extraordinary high temperature of 650 °C catalyzes high NH3-synthesis rates under mild conditions. At 400 °C under 1.0 MPa, the synthesis rate was comparable with that of most active oxide-supported Ru catalysts. Kinetic analysis revealed that hydroge
To mitigate global problems related to energy and global warming, it is helpful to develop an ammonia synthesis process using catalysts that are highly active under mild conditions. Here we show that the ammonia synthesis activity per weight of catalyst of Ru/Ba/LaCeOx, prereduced at 700 °C, is the highest among reported oxide-supported Ru catalysts, 52.3 mmol h–1 gcat–1 at 350 °C, 1.0 MPa. The turnover frequency of Ru/Ba/LaCeOx at 350 °C was more than 8 times that of Cs+/Ru/MgO, which is a well
The phase transfer of TiO2 from anatase to rutile for a 10 wt% Co/TiO2 catalyst during the reduction causes serious disappearance of activity at 0.1 MPa during CH4/CO2 reforming, whereas the transfer for 0.5 wt% Co/TiO2 brings about relatively stable activity at 2 MPa.
To realize a carbon-free society, catalysts are needed for the synthesis of ammonia under mild reaction conditions (<400 °C, <10 MPa) that use hydrogen produced from renewable energy. Ru-based catalysts are currently the most promising candidates; however, Ru is expensive and of low abundance. Here, we discovered that the encapsulation of Co nanoparticles with BaO enhanced the ammonia synthesis activity of Co and that a simple Ba-doped Co/MgO catalyst prereduced at an unusually high temperature
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