Tokyo Institute of Technology · 화학공학
유이치 만카 교수의 연구실은 에너지 전환과 환경 정화를 위한 첨단 촉매 기반 기술 개발에 중점을 두고 있습니다. 특히 수소 생산을 위한 형산 탈수소화 반응, 암모니아 회수 및 유레아 합성, 저온에서의 질소 산화물 및 질소 화합물의 동시 처리 기술이 핵심 연구 분야입니다. 고체 촉매의 표면 특성 분석과 나노구조 제어를 통해 반응 메커니즘을 정량적으로 규명하고 있으며, 생체분자 상호작용의 동시 모니터링 기술도 개발하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Iridium azole-containing complexes are demonstrated to catalyze the dehydrogenation of formic acid into H2–CO2 (1/1) mixtures in aqueous solution in the absence of organic additives, and with a maximum turnover frequency (TOF) of 34 000 h−1 at 80 °C.
Ammonia from sewage and livestock manure is a major environmental pollutant. To consume environmental ammonia, we investigated the organic base-catalyzed synthesis of urea. 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) catalyzes the conversion of ammonium carbamate to urea in 35% yield at 100 °C. Moreover, DBU also converts other ammonium salts into urea. A mechanism that involves nucleophilic attack of ammonia following ion exchange is proposed.
Catalysts supported on CeO2 were prepared using various Ru precursors. The H2-TPR profile of the catalyst was obtained beginning at -70 °C for the first time, and a previously unreported reduction peak was observed at approximately 50 °C. The lower peak temperature was associated with a higher ammonia synthesis activity.
Protein bindings onto a gold surface were detected simultaneously by QCM (delta F(water)) and anomalous reflection (deltaR) of gold on the same surface in aqueous solutions; the obtained delta F(water)/deltaR values correlated with surface areas and viscosity of proteins.
A Cu/CeO 2 catalyst was developed to simultaneously treat exhaust gas and supply ammonia at low temperatures.
Hydrogen generation via dehydrogenation of formic acid using an immobilized Ir-complex catalyst, which combines the catalytic ability of the homogeneous catalyst and ease in handling of the heterogeneous catalyst, was investigated. The immobilization process was analyzed by scanning electron microscopy, Fourier transform infrared spectroscopy, and nitrogen adsorption-desorption measurement. Analytical methods for the heterogeneous catalyst remained appropriate for immobilized catalyst analysis.
Dehydrogenation of formic acid using half-sandwich iridium complexes with bidentate nitrogen ligands has high potential for hydrogen production, because hydrogen is formed in water without organic additive under mild reaction conditions with no CO contamination. Formic acid can be produced by hydrogenation of CO2, and therefore formic acid as hydrogen carrier leads to CO2 utilization. A series of complexes containing various diazole (imidazole and pyrazole) moieties as ligands were comprehensive
Technology for the utilization of carbon dioxide (CO2) is expected to gain importance in the near future. This review of studies describes the catalytic conversion of CO2 to chemically useful molecules. Catalysts have been used for the hydrosilylation of CO2, for the synthesis of formic acid (from hydrogen and CO2), for selective decomposition of formic acid to hydrogen and CO2, and for the synthesis of urea from ammonium ions and CO2. These catalytic systems will facilitate the sustainable recy
Abstract Ruthenium (Ru) catalysts supported on cerium oxide (CeO 2 ), which was composed of high crystallinity (HC) CeO 2 covered by low crystallinity (LC) CeO 2 were investigated. The ammonia synthesis activities of a series of Ru/CeO 2 (LC)/CeO 2 (HC), having different LC/HC ratios were evaluated, and various characterizations, such as N 2 adsorption, X‐ray diffraction, hydrogen temperature‐programmed reduction (H 2 ‐TPR), and hydrogen temperature‐programmed desorption (H 2 ‐TPD), were perform
