Mesoporous Co3O4 with Controlled Porosity: Inverse Micelle Synthesis and High-Performance Catalytic CO Oxidation at −60 °C
Citations Over TimeTop 1% of 2014 papers
Abstract
Crystalline mesoporous cobalt oxides with improved catalytic activity in CO oxidation were synthesized using an inverse surfactant micelle method. The prepared materials are monodispersed nanoparticle aggregates, and the mesopores are formed by connected intraparticle voids. Powder X-ray diffraction (PXRD), N2 sorption, field emission scanning electron microscope (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM) revealed that both pore and nanoparticle sizes are enlarged with increasing thermal treatment temperatures (150–450 °C). Mesoporous cobalt oxide calcined at 350 °C exhibited the best oxidation activity and can achieve complete oxidization (100% conversion) of CO to CO2 at −60 °C under normal conditions (∼3–10 ppm of H2O) and at 80 °C under moisture rich conditions (∼3% H2O). The commercial Co3O4 reached 100% conversion at 220 °C under normal conditions. X-ray photoelectron spectroscopy (XPS), O2-temperature-programmed desorption (O2-TPD), H2-temperature-programmed reduction (H2-TPR), CO-TPD, and N2 sorption analyses indicated that the surface oxygen vacancy and large surface area promoted the lattice oxygen mobility of the catalysts and further enhanced their catalytic performance. The catalysts were deactivated by accumulation of water and formation of carbonates, but their activities can be easily restored by expelling water and carbonates at moderate temperature (200 °C).
Related Papers
- → Effects of calcination temperature on morphology and structure of CeO2 nanofibers and their photocatalytic activity(2019)66 cited
- → Cobalt oxide nanorods with special pore structure for enhanced ethanol sensing performance(2018)46 cited
- → The specific surface area and catalytic properties of the calcination products of δ-FeOOD(1979)4 cited
- PREPARATION OF COBALT OXIDE/ZINC OXIDE NANOCOMPOSITE(2010)
- Catalytic performance of Co /Hβ in N_2O decomposition(2014)