Investigation of Different Apatites-Supported Co.sub.3O.sub.4 as Catalysts for N.sub.2O Decomposition

• Published in: Catalysis Surveys from Asia Vol. 25; no. 2; p. 168
• Main Authors: Liu, Xiaoli, Wang, Yongzhao, Wu, Ruifang, Zhao, Yongxiang
• Format: Journal Article
• Language: English
• Published: Springer 01.06.2021
• Subjects: Catalysts; Investigations
• ISSN: 1571-1013; 1571-1013
• DOI: 10.1007/s10563-021-09323-x

Two types of apatite supports including hydroxyapatite (HAP) and fluorapatite (FAP) were prepared by the co-precipitation method. Supported Co catalysts with the above carriers were synthesized from Co(NO.sub.3).sub.2·6H.sub.2O via the impregnation method. The catalytic activity for N.sub.2O decomposition was investigated using a continuous flowing microreactor system. The catalytic results demonstrated that the Co/HAP exhibited more excellent catalytic activity as well as the impurity gas (H.sub.2O, O.sub.2, and NO) resistance capability than the Co/FAP in the temperature range of 300-600 °C. Furthermore, the physicochemical properties of Co/HAP and Co/FAP were determined by several relevant characterization methods. The obtained experimental results revealed that Co/HAP possessed larger specific surface area, more ion-exchanged Co.sup.2+ and stronger oxygen desorption capacity than Co/FAP, which are the key factors for high N.sub.2O decomposition activity. Moreover, compared with Co/FAP, Co/HAP has not only more basic content, but also higher basic site density, which may be also conducive to enhance the electron donating ability of Co.sup.2+, thereby promoting the N.sub.2O catalytic decomposition. Graphic