In the last two decades,structure and properties of Ruddlesden–Popper phase(RP)A2BO4 oxides with K2NiF4 structure,have been widely investigated.But to the best of our knowledge,no review article is available in the l...In the last two decades,structure and properties of Ruddlesden–Popper phase(RP)A2BO4 oxides with K2NiF4 structure,have been widely investigated.But to the best of our knowledge,no review article is available in the literature on recent studies on these oxides.Therefore,in this article,recent studies on structure,electrical,dielectric,and optical properties of these oxides have been reviewed.Special attention is put on to highlight the effect of doping and oxygen stoichiometry on the structure and properties of these oxides.Further,important applications of these oxides have also been mentioned in this article.展开更多
用柠檬酸络合法制备了多个系列的类钙钛石(A2BO4)结构的复合氧化物催化剂,系统地研究探讨了该类催化剂的晶体与光谱结构、缺陷结构、对NO和CO等小分子的吸附性能、对氧的吸脱性能及氧化还原性能和稳定性,同时考察了上述多个系列催化剂...用柠檬酸络合法制备了多个系列的类钙钛石(A2BO4)结构的复合氧化物催化剂,系统地研究探讨了该类催化剂的晶体与光谱结构、缺陷结构、对NO和CO等小分子的吸附性能、对氧的吸脱性能及氧化还原性能和稳定性,同时考察了上述多个系列催化剂对NO直接分解和CO还原NO反应的催化性能。发现Ni系A2BO4复合氧化物是NO直接分解的高活性催化体系,特别是LaSrNiO4-λ催化剂具有很高NO的分解活性,其活性高于文献报道Y Ba CuO/MgO的和Co系ABO3催化剂。同时发现LaSrCuO4-λ具有较高的CO还原NO催化性能。提出了在类钙钛石复合氧化物催化剂上NO分解和还原反应统一的氧化还原反应机制,并比较了两个反应的异同点,确认了氧空位在上述反应中的作用。并较深入的探讨了取代效应、过渡元素、稀土元素和结构效应对NO分解和CO还原NO反应的影响机制。本文分析总结了作者在类钙钛石(K2NiF4)结构复合氧化物的固态物化性质及对NOx消除反应的催化性能方面的基础性研究结果。展开更多
The mixed oxides, Nd2-xSrxCoO4±λ（0.4 ≤ x≤ 1.2）, with K2NiF4 structure were synthesized by the polyglycol gel method. The composition and structure of the catalysts were characterized by means of IR, TPD, TPR...The mixed oxides, Nd2-xSrxCoO4±λ（0.4 ≤ x≤ 1.2）, with K2NiF4 structure were synthesized by the polyglycol gel method. The composition and structure of the catalysts were characterized by means of IR, TPD, TPR, chemical analysis and so on. The catalytic performance for NO reduction was investigated. The results show that the mixed oxides have K2NiF4 structure. Other phases are found when x = 1.2. The amount of Co^3＋ and the lattice oxygen over Nd2-xSrxCoO4±λ increase with the increase of x. It is found that the catalytic activity for NO reduction is closely correlated with the concentration of oxygen vacancies and the amount of Co^3＋ .展开更多
文摘In the last two decades,structure and properties of Ruddlesden–Popper phase(RP)A2BO4 oxides with K2NiF4 structure,have been widely investigated.But to the best of our knowledge,no review article is available in the literature on recent studies on these oxides.Therefore,in this article,recent studies on structure,electrical,dielectric,and optical properties of these oxides have been reviewed.Special attention is put on to highlight the effect of doping and oxygen stoichiometry on the structure and properties of these oxides.Further,important applications of these oxides have also been mentioned in this article.
文摘用柠檬酸络合法制备了多个系列的类钙钛石(A2BO4)结构的复合氧化物催化剂,系统地研究探讨了该类催化剂的晶体与光谱结构、缺陷结构、对NO和CO等小分子的吸附性能、对氧的吸脱性能及氧化还原性能和稳定性,同时考察了上述多个系列催化剂对NO直接分解和CO还原NO反应的催化性能。发现Ni系A2BO4复合氧化物是NO直接分解的高活性催化体系,特别是LaSrNiO4-λ催化剂具有很高NO的分解活性,其活性高于文献报道Y Ba CuO/MgO的和Co系ABO3催化剂。同时发现LaSrCuO4-λ具有较高的CO还原NO催化性能。提出了在类钙钛石复合氧化物催化剂上NO分解和还原反应统一的氧化还原反应机制,并比较了两个反应的异同点,确认了氧空位在上述反应中的作用。并较深入的探讨了取代效应、过渡元素、稀土元素和结构效应对NO分解和CO还原NO反应的影响机制。本文分析总结了作者在类钙钛石(K2NiF4)结构复合氧化物的固态物化性质及对NOx消除反应的催化性能方面的基础性研究结果。
文摘The mixed oxides, Nd2-xSrxCoO4±λ（0.4 ≤ x≤ 1.2）, with K2NiF4 structure were synthesized by the polyglycol gel method. The composition and structure of the catalysts were characterized by means of IR, TPD, TPR, chemical analysis and so on. The catalytic performance for NO reduction was investigated. The results show that the mixed oxides have K2NiF4 structure. Other phases are found when x = 1.2. The amount of Co^3＋ and the lattice oxygen over Nd2-xSrxCoO4±λ increase with the increase of x. It is found that the catalytic activity for NO reduction is closely correlated with the concentration of oxygen vacancies and the amount of Co^3＋ .
