A new highly active La2O3–CuO–MgO catalyst for the synthesis of cumyl peroxide by catalytic oxidation. Issue 21 (30th March 2021)

• Record Type: Journal Article
• Authors: Liu, HanShuang; Wang, KaiJun; Cao, XiaoYan; Su, JiaXin; Gu, Zhenggui
• Is Part Of: RSC advances. Volume 11:Issue 21(2021)
• Page Start: 12532
• Page End: 12542
• Publication Date: 2021-03-30
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra00176k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The La2 O3 –CuO–MgO catalyst acts on the oxidation of cumene and shows excellent catalytic activity through the coordination of surface and interior. Abstract : In this study, different magnesium, copper, lanthanide single metal, and composite multimetal oxide catalysts were prepared via the coprecipitation route for the aerobic oxidation of cumene into cumene hydroperoxide. All catalysts were characterized using several analytical techniques, including XRD, SEM, EDS, FT-IR, BET, CO2 -TPD, XPS, and TG-DTG. La2 O3 –CuO–MgO shows higher oxidation activity and yield than other catalysts. The results of XRD and SEM studies show that the copper and magnesium particles in the catalyst are smaller in size and have a distribution over a larger area due to the introduction of the lanthanum element. The CO2 -TPD results confirmed that the catalyst has more alkali density and alkali strength, which can excite active sites and prevent the decomposition of cumene hydroperoxide. XPS results show that due to the promotional effect of La2 O3, there are more lattice and active oxygen species in the catalyst, which can effectively utilize the lattice defects under the strong interaction between metal oxides for rapid adsorption and activation, thus improving the oxidation performance. Besides, La2 O3 –CuO–MgO exhibits good stability and crystalline structure due to its high oxygen mobility inhibiting coking during the cycle stability test. Finally, the possible reaction pathway and promotional mechanism on La2 O3 –CuO–MgO in cumene oxidation are proposed. We expect this study to shed more light on the nature of the surface-active site(s) of La2 O3 –CuO–MgO catalyst for cumene oxidation and the development of heterogeneous catalysts with high activity in a wide range of applications.