Polymer nanofilm-coated catalysis: An approach for enhancing water-resistance of Co-Fe oxide nano-catalysts under moisture-rich condition

Combustion of lean methane over Co3O4 catalysts prepared with different cobalt precursors

“…The E a can be obtained from the slope of the linear plot of ln r versus 1/T according to eqn (2) and the data are listed in Table 3. 64 It is obvious that the sequence of the E a is Co 3 O 4 -Ac < Co 3 O 4 -Cl < Co 3 O 4 -N < Co 3 O 4 -S, which is in well agreement with the activity. The Co 3 O 4 -Ac catalyst possesses the lower activation energy (E a is 24.94 kJ mol À1 ) and a better performance with a lower reaction temperature at 318 C for the 50% methane conversion, while the conversion is only 16% for the Co 3 O 4 -S sample at this temperature, as comparison.…”

Template-free Synthesis of Stable Cobalt Manganese Spinel Hollow Nanostructured Catalysts for Highly Water-Resistant CO Oxidation

“…Moreover, the as-prepared Co x Mn y O 4 spinel catalysts showed long-term stability in the presence of steam and maintained the activity with little fluctuation for as long as 30 h (Figure 3D). Compared with the performance of reported spinel-type catalysts, which often decayed in the first 10 h (Shen et al., 2017, Wang et al., 2014), the results demonstrated that as-prepared cobalt manganese spinel multi-shelled hollow microsphere catalysts were much more stable and very promising for practical application. The robust shield of bistratal shells can effectively retard the water poisoning, thus preserving high catalytic efficiency during CO oxidation, even under moisture-rich conditions.…”

“…Compared with literature findings, Xie and co-workers synthesized very-high-activity Co 3 O 4 nanorods with predominantly exposed {110} planes; however, the ΔT of Co 3 O 4 nanorods catalysts was as large as 277°C (Xie et al., 2009). Meanwhile, the ΔT of most reported spinel nanoparticles was also very high and in the range of 100°C–178°C (Table S2) (Song et al., 2014, Kuo et al., 2014, Shen et al., 2017, Wang et al., 2014, Yu et al., 2009, Biemelt et al., 2016). Comparatively, the ΔT values of our Co x Mn y O 4 sample can reach as low as 20°C, exhibiting the excellent water-resistent ability of Co x Mn y O 4 multi-shelled hollow microsphere catalysts.…”

Crystal Facet Induced Single‐Atom Pd/CoxOy on a Tunable Metal–Support Interface for Low Temperature Catalytic Oxidation

“…Water‐caused deactivation of metal oxide catalysts has long been a great problem, which limits their further applications in practice, especially for cobalt‐based catalysts. [ 41,42 ] Water induces dissociative adsorption in the oxygen vacancies and Co 3+ , resulting the formation of carbonates. On the other hand, although the reported Pd‐based catalysts (Pd/CeO 2 ) possess a fortuitous TOF value (0.2 s −1 ), [ 14 ] Pd catalysts suffer severely from water poisoning at low temperatures, largely due to water strongly binding to PdO site.…”