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Effect of the precipitation pH on the characteristics and performance of Co3O4 catalysts in the total oxidation of toluene and propane
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2020-09-22 , DOI: 10.1016/j.apcatb.2020.119566
Weidong Zhang , Kelsey Lassen , Claude Descorme , Jose Luis Valverde , Anne Giroir-Fendler

Co3O4 catalysts were prepared via carbonate precipitation at different pH, characterized using TG/DTA, FTIR, XRD, Raman, N2 adsorption and TPR techniques, and tested in the total oxidation of toluene or propane. The precipitation pH may affect the composition of the cobalt oxide precursors as well as the physicochemical properties and the performance of Co3O4 catalysts. By controlling the precipitation pH at 9.5, a Co3O4 catalyst with the smallest crystalline size, the largest surface area, the most defective structure, and the best reducibility was obtained. The activity of the as-prepared Co3O4 catalysts in the oxidation of toluene was linearly dependent on the low temperature reducibility of the oxide. Among all catalysts, Co-9.5 exhibited the highest catalytic activity (T10 = 197 °C and T90 = 244 °C), excellent cycling-stability and good durability upon long-term activity test. In propane oxidation, residual sodium at the surface of the Co3O4 catalyst had a marked poisoning effect on the catalytic performance, evidencing the importance of washing procedure upon catalyst preparation.



中文翻译:

沉淀pH对甲苯和丙烷全氧化过程中Co 3 O 4催化剂的特性和性能的影响

通过在不同pH值下碳酸盐沉淀制备Co 3 O 4催化剂,使用TG / DTA,FTIR,XRD,拉曼,N 2吸附和TPR技术对其进行表征,并在甲苯或丙烷的总氧化中进行测试。沉淀pH值可能会影响氧化钴前体的组成以及物理化学性质和Co 3 O 4催化剂的性能。通过将沉淀pH控制在9.5,得到具有最小晶体尺寸,最大表面积,最有缺陷的结构和最佳还原性的Co 3 O 4催化剂。所制备的Co 3 O 4的活性甲苯氧化中的催化剂线性依赖于氧化物的低温还原性。在所有催化剂中,Co-9.5表现出最高的催化活性(T 10 = 197°C和T 90 = 244°C),优异的循环稳定性和经长期活性测试的良好耐久性。在丙烷氧化中,Co 3 O 4催化剂表面残留的钠对催化性能具有明显的中毒作用,证明了催化剂制备过程中洗涤程序的重要性。

更新日期:2020-10-02
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