A comparative study on the catalytic activities of the SrTiO3 perovskite and oxide CuO-ZnO mixed oxides for the oxidative coupling of methane

Abstract

In this study, SrTiO3 catalyst was prepared by sol-gel method and CuO-ZnO by co-precipitation for oxidative coupling of methane (OCM). The results showed that the conversion rate in the SrTiO3 sample was high (about 35%) at 850 oC, and the product C2H4 with an yield of 0.12%. Several modern analytical methods such as XRD, BET, TPx, SEM have been characterized. The XRD results showed a stable phase structure and high crystallinity with both samples. NH3-TPD recorded weak acid centers on SrTiO3, leading to coke formation on the impact surface. H2-TPR and O2-TPD express the redox of CuO-ZnO, resulting in a deep oxidation product of CO2. Factors affecting the ratio of C2H6 and C2H4 were also considered.