摘要:
A catalyst for purifying carbon monoxide, hydrocarbons and nitrogen oxides in exhaust gases at the stoichiometric point or in oxygen-rich atmosphere, is disclosed, and it includes a porous support, at least one noble metal catalyst ingredient loaded on the porous support, and selected from the group consisting of platinum, palladium and rhodium, and at least one NO x adsorbent loaded on the porous support, selected from the group consisting of alkali metals, alkaline-earth metals and rare-earth elements, and having an average particle diameter falling in a range of from 0.1 to 20 micrometers. A process for purifying, by bringing the exhaust gases into contact with the catalyst, is also disclosed.
摘要:
A catalyst for purifying carbon monoxide, hydrocarbons and nitrogen oxides in exhaust gases at the stoichiometric point or in oxygen-rich atmosphere, is disclosed, and it includes a porous support, at least one noble metal catalyst ingredient loaded on the porous support, and selected from the group consisting of platinum, palladium and rhodium, and at least one NO x adsorbent loaded on the porous support, selected from the group consisting of alkali metals, alkaline-earth metals and rare-earth elements, and having an average particle diameter falling in a range of from 0.1 to 20 micrometers. A process for purifying, by bringing the exhaust gases into contact with the catalyst, is also disclosed.
摘要:
A catalyst for reducing NO x in automotive exhaust gases, which is formed of a copper-aluminum composite oxide and which exhibits two peaks in the X-ray spectrum corresponding to interplanar spacings of approximately 0.2 nm and approximately 0.28 nm. This composite oxide exhibits high NO x conversion and superb heat resistance, though its crystal structure is not known yet.
摘要:
Catalysts for purifying an exhaust gas containing an excess amount of oxygen, to remove nitrogen oxides, carbon monoxide and hydrocarbons therefrom, the catalyst containing silicon dioxide (SiO2) and alumina (Al2O3) in a molar ratio of SiO2 to Al2O3 of at least 15, and containing cobalt alone or in combination with at least one metal selected from alkali earth metals and rare earth metals, and a method of purifying the exhaust gas using the described catalyst. The catalyst exhibits less thermal deterioration of the properties and performances thereof during use at an elevated temperature for an extended time, and accordingly, has an excellent durability. The catalyst is particularly useful for the purification of exhaust gases originating from an internal combustion engine of an automobile, and a nitric acid production plant.
摘要:
Catalysts for purifying an exhaust gas containing an excess amount of oxygen, to remove nitrogen oxides, carbon monoxide and hydrocarbons therefrom, the catalyst containing silicon dioxide (SiO₂) and alumina (Al₂O₃) in a molar ratio of SiO₂ to Al₂O₃ of at least 15, and containing cobalt alone or in combination with at least one metal selected from alkali earth metals and rare earth metals, and a method of purifying the exhaust gas using the described catalyst. The catalyst exhibits less thermal deterioration of the properties and performances thereof during use at an elevated temperature for an extended time, and accordingly, has an excellent durability. The catalyst is particularly useful for the purification of exhaust gases originating from an internal combustion engine of an automobile, and a nitric acid production plant.
摘要翻译:用于净化含有过量氧气的废气以除去氮氧化物,一氧化碳和烃的催化剂,含有SiO 2与Al 2 O 3的摩尔比至少为15的二氧化硅(SiO 2)和氧化铝(Al 2 O 3)的催化剂, 并且单独或与至少一种选自碱土金属和稀土金属的金属组合的钴,以及使用所述催化剂净化废气的方法。 该催化剂在高温使用期间延长时间的性能和性能的热劣化较少,因此具有优异的耐久性。 催化剂特别可用于净化来自汽车内燃机的废气和硝酸生产装置。