摘要:
An oxide material characterized by that it has a perovskite structure comprising an oxide represented by ABO3, (Bi2O2)2+ (Am−1BmO3m+1)2− wherein A represents one kind or two or more kinds of ions selected from the group consisting of Li+, Na+, K+, Pb2+, Ca2+, Sr2+, Ba2+, Bi3+, Y3+, Mn3+ and La3+, B represents one kind or two or more kinds of ions selected from the group consisting of Ru3+, Fe3+, Ti4+, Zr4+, Cu4+, Nb5+, Ta5+, V5+, W6+ and Mo6+, and m represents a natural number of 1 or more, LnBa2Cu3O7, Z2Ba2Can−1CunO2n+4 or ZBa2Can−1CunO2n+3, wherein Ln represents one kind or two or more kinds of ions selected from the group consisting of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, Z represents one kind or two or more kinds of ions selected from the group consisting of Bi, Tl and Hg, and n represents a natural number of from 1 to 5; and a catalytic substance containing one or more kinds of elements selected from the group consisting of Si, Ge and Sn.
摘要:
A purification catalyst for exhaust gas enhances the activities of the precious metals, preventing decrease of activities at high temperature, and exhibiting a satisfactory performance during operation. In the purification catalyst of the present invention, Pd is supported by an aluminum composite oxide having a perovskite structure, the aluminum composite oxide is LnAl1−xMxO3 in which Ln is a rare-earth element, and the element M in the LnAl1−xMxO3 is one of elements in groups 1 to 5 and groups 12 to 14.
摘要翻译:用于废气的净化催化剂增强贵金属的活性,防止高温下的活性降低,并且在操作期间表现出令人满意的性能。 在本发明的纯化催化剂中,Pd由具有钙钛矿结构的铝复合氧化物负载,铝复合氧化物为LnAl 1-x M x O O > 3 sub>其中Ln是稀土元素,并且LnAl 1-x M x O 3 3中的元素M SUB >是组1至5和组12至14中的元素之一。
摘要:
Perovskite-type catalyst consists essentially of a metal oxide composition and methods of using them are provided. The metal oxide composition is represented by the general formula Aa−xBxMOb, in which A is a mixture of elements originally in the form of single phase mixed lanthanides collected from bastnasite; B is a divalent or monovalent cation; M is at least one element selected from the group consisting of elements of an atomic number of from 23 to 30, 40 to 51, and 73 to 80; a is 1 or 2; b is 3 when a is 1 or b is 4 when a is 2; and x is a number defined by 0≦x
摘要:
To provide a highly safe and hygienic method for industrially efficiently producing a perovskite-type composite oxide at low temperatures in heat treatment, in which the resulting perovskite-type composite oxide can maintain the catalytic activity of a noble metal at a high level over a long time, in a method for producing a perovskite-type composite oxide, a perovskite-type composite oxide is produced by mixing organometal salts of all elementary components constituting the perovskite-type composite oxide to prepare a precursor of the perovskite-type composite oxide, or mixing one or more organometal salts of part of the elementary components constituting the perovskite-type composite oxide with the other elementary components prepared as alkoxides of the respective elements, a coprecipitate of salts of the respective elements or a citrate complex of the respective elements to prepare a precursor of the perovskite-type composite oxide, and heat-treating the precursor of the perovskite-type composite oxide.
摘要:
Production of oxygen-enriched gas streams is disclosed herein. Air streams contact an oxygen-selective mixed conductor particularly a perovskite material whereby oxygen is retained or adsorbed on the perovskite and can be employed in a variety of processes such as in combusting a fuel gas, heat recovery and boiler related operations.
摘要:
An improved gas diffusion electrode composed of a perovskite-type oxide dispersed in a mixture of carbon black and a hydrophobic binder polymer. An improved catalyst for use in the electrochemical reduction of oxygen comprising a perovskite-type compound having alpha and beta sites, and having a greater molar ratio of cations at the beta site. A particularly good reduction catalyst is a neodymium calcium manganite. An improved method of dispersing the catalysts with carbon in a reaction layer of the electrode improves performance of the electrode and the oxygen reduction process. This is provided by adding carbon black to an aqueous solution of metal salts before it is heated to a gel and then to a char and then calcined. Optionally, a quantity of the desired oxide catalyst can be premixed with a portion the carbon before adding the carbon to an aqueous solution of the metal salts to be heated. The amount of premixed metal oxide is chosen in conjunction with the amount of metal salts to provide the desired molar ratio after heating and calcining of the aqueous solution.
摘要:
A method of changing the resistance of a perovskite metal oxide thin film device with a resistance-change-producing pulse includes changing the resistance of the device by varying the duration of a resistance-change-producing pulse.
摘要:
Perovskite-type catalyst consists essentially of a metal oxide composition is provided. The metal oxide composition is represented by the general formula Aa-xBxMOb, in which A is a mixture of elements originally in the form of single phase mixed lanthanides collected from bastnasite; B is a divalent or monovalent cation; M is at least one element selected from the group consisting of elements of an atomic number of from 23 to 30, 40 to 51, and 73 to 80; a is 1 or 2; b is 3 when a is 1 or b is 4 when a is 2; and x is a number defined by 0≦x
摘要:
A perovskite-type catalyst consists essentially of a metal oxide composition. The metal oxide composition is represented by the general formula A.sub.1-x B.sub.x MO.sub.3, in which A is a mixture of elements originally in the form of single phase mixed lanthanides collected from bastnasite; B is a divalent or monovalent cation; M is at least one element selected from the group consisting of elements of an atomic number of from 23 to 30, 40 to 51, and 73 to 80; a is 1 or 2; b is 3 when a is 1 or b is 4 when a is 2; and x is a number defined by 0.ltoreq.x
摘要翻译:钙钛矿型催化剂基本上由金属氧化物组合物组成。 金属氧化物组合物由通式A1-xBxMO3表示,其中A是原始以从bastnasite收集的单相混合镧系元素形式的元素的混合物; B是二价或一价阳离子; M为选自23至30,40至51和73至80的原子序数的元素中的至少一种元素; a是1或2; 当a为1时,b为3,当a为2时,b为4; 并且x是由0 = x <0.5定义的数字。
摘要:
A catalyst for purifying exhaust gases of an automobile engine including a carrier coprecipitated with a material absorbing oxides of nitrogen (NO.sub.x) and an active noble metal wherein the material absorbing oxides of nitrogen is at least one of barium manganese oxide (BaMnO.sub.3) and calcium manganese oxide (CaMnO.sub.3). The carrier coprecipitated with BaMnO.sub.3 or CaMnO.sub.3 shows superior capacity for absorbing oxides of nitrogen. Consequently, a catalyst according to the present invention can effectively purify engine exhaust, even in a lean burn environment.