报告题目：Excellent Catalytic Activity of a Pd-promoted MnOx Catalyst for Purifying Automotive Exhaust Gases – Reduction of precious metal use

报告时间：2020年09月23日（星期三）上午10:00-11:30

报告地点：腾讯会议

会议ID: 558083645

报 告 人：Prof. Tsunehiro Tanaka教授（田中庸裕,日本京都大学）

报告摘要:

activity and reduced precious metal use. Such catalysts must undergo simultaneous CO/ hydrocarbon oxidations and NO reduction. A Pd catalyst supported on Mn-modified hexagonal YbFeO₃ (Pd/Mn-YFO) exhibited extremely high activity at low temperature via a Mars-van Krevelen (MvK) mechanism involving lattice oxygen and oxygen vacancy site in the catalyst support.

CO + O_L → CO₂ + V_O                                                                  

NO + V_O → N_s + O_L                                                                   

N_s + N_s  → N₂             

where O_L is a lattice oxygen, V_O is an oxygen vacancy site, and N_s is a dissociated N species formed on the surface of the MnO-like species.

NO reduction proceeded by high CO and C₃H₆ oxidation activity of Pd/Mn-YFO, and the catalytic activity of 1.0 wt% Pd/Mn-YFO was higher than that of 5.0 wt% Pd/Al₂O₃, despite the lower Pd loading. We clarified that the lattice oxygen in MnO_x, which existed on the surface of YFO, consumed by CO and C₃H₆ oxidation was recovered by NO to form N₂ via MvK-type NO reduction, while the Pd species promoted NO adsorption and dissociation on MnO-like species.

Figure  (A) NO conversions and (B) T₅₀ values for NO reduction with CO and C₃H₆ over the Pd catalysts. The reaction gas comprised 1000 ppm NO, 1000 ppm CO, 250 ppm C₃H₆, and 1125 ppm O₂ with He as the balance. T₅₀ was defined as the temperature at which 50% catalytic activity was achieved.

References:

S. Hosokawa, S. Matsumoto, K. Onishi, H. Asakura, K. Teramura, T. Tanaka, Catal. Today,2019, 332, 183-188.

S. Hosokawa, R. Tada, T. Shibano, S. Matsumoto, K. Teramura, T. Tanaka, Catal. Sci. Technol.,2016, 6, 7868-7874.

S. Hosokawa, T. Shibano, H. Koga, M. Matsui, H. Asakura, K. Teramura, M. Okumura, T. Tanaka

ChemCatChem, 2020, in press.

报告人简介:

Tsunehiro Tanaka教授，现任日本京都大学工程学院分子工程系教授，1987年于日本京都大学化学专业获得博士学位，1987-1990年在美国北海道大学化学系(Department of Chemistry, Faculty of Science, Hokkaido University)做助理教授，1990年进入日本京都大学工程学院工作。1996年在中国兰州物理化学研究所担任客座教授。1996年在意大利都灵大学物理无机材料化学系担任客座学者。目前担任日本京都大学催化剂与电池元素战略计划主任，英国皇家学会《Catalysis Science & Technology》副主编。曾获得“日本催化协会青年科学家奖”。目前主要从事多相光催化研究；机动车催化剂元素战略研发；催化反应表征研究等。