The influence of alkali metal cations in substituted nanostructured LaCoO3 on oxidation catalytic activity

Thi Hoang Yen Quach, Thi Minh Nguyet Tran, Que Chi Tran, Quoc Trung Nguyen, Thi Toan Nguyen and Dang Khuong Le

  • ANSN Editor
Keywords: nano


Perovskite-type oxides La0.9M0.1CoO3 (M=K/Na/Li) were prepared by a citrate sol–gel method. These oxides were characterized by x-ray diffraction analysis (XRD), a scanning electron microscope (SEM) and the N2 physisorption Brunauer–Emmitt–Teller (BET) method. Their catalytic activity was studied by a constant microflow method for CO- and C3H6-oxidation and by thermal decomposition of diesel soot. The results show that the obtained perovskite materials have a sphere shape, particles size of about 40–50 nm and surface area from 12.0 to 14.9 m2 g−1. They have high catalytic activities decreasing in the sequence K > Na > Li on conversion CO, C3H6 and diesel soot. The total conversion temperature of CO, C3H6 and diesel soot is 325 °C, 340 °C and 430 °C, respectively. Thus, these catalysts have high applicability in the removal of exhaust gas, especially from diesel engines

Regular articles