Torimoto Maki, Ogo Shuhei, Hisai Yudai, Nakano Naoya, Takahashi Ayako, Ma Quanbao, Seo Jeong Gil, Tsuneki Hideaki, Norby Truls, Sekine Yasushi
Department of Applied Chemistry, Waseda University 3-4-1, Okubo Shinjuku Tokyo 169-8555 Japan
Department of Chemistry, University of Oslo, FERMiO Gaustadalléen 21 Oslo NO-0349 Norway.
RSC Adv. 2020 Jul 14;10(44):26418-26424. doi: 10.1039/d0ra04717a. eCollection 2020 Jul 9.
Low temperature (<500 K) methane steam reforming in an electric field was investigated over various catalysts. To elucidate the factors governing catalytic activity, activity tests and various characterization methods were conducted over various oxides including CeO, NbO, and TaO as supports. Activities of Pd catalysts loaded on these oxides showed the order of CeO > NbO > TaO Surface proton conductivity has a key role for the activation of methane in an electric field. Proton hopping ability on the oxide surface was estimated using electrochemical impedance measurements. Proton transport ability on the oxide surface at 473 K was in the order of CeO > NbO > TaO The OH group amounts on the oxide surface were evaluated by measuring pyridine adsorption with and without HO pretreatment. Results indicate that the surface OH group concentrations on the oxide surface were in the order of CeO > NbO > TaO These results demonstrate that the surface concentrations of OH groups are related to the proton hopping ability on the oxide surface. The concentrations reflect the catalytic activity of low-temperature methane steam reforming in the electric field.
研究了在电场中低温（<500 K）下甲烷蒸汽重整在各种催化剂上的情况。为了阐明影响催化活性的因素，对包括CeO、NbO和TaO等各种氧化物作为载体进行了活性测试和各种表征方法。负载在这些氧化物上的Pd催化剂的活性表现为CeO > NbO > TaO。表面质子传导率对电场中甲烷的活化起着关键作用。使用电化学阻抗测量估计了氧化物表面的质子跳跃能力。473 K时氧化物表面的质子传输能力顺序为CeO > NbO > TaO。通过测量有无H₂O预处理的吡啶吸附来评估氧化物表面的OH基团数量。结果表明，氧化物表面的表面OH基团浓度顺序为CeO > NbO > TaO。这些结果表明，OH基团的表面浓度与氧化物表面的质子跳跃能力有关。这些浓度反映了电场中低温甲烷蒸汽重整的催化活性。
