Multicomponent metal oxides derived from Mn-BTC anchoring with metal acetylacetonate complexes as excellent catalysts for VOCs and CO oxidation

Metal oxide/CeO2 nanocomposites derived from Ce-benzene tricarboxylate (Ce-BTC) adsorbing with metal acetylacetonate complexes for catalytic oxidation of carbon monoxide

“…Fig. 8a displays in situ DRIFTS of CO adsorption, N 2 purging, and O 2 dose over Cu/CeO 2 at 40 C. Two intensive peaks at 2173 and 2115 cm À1 appear aer CO feeding for 30 min, which can be attributed to the gas-phase CO. 20,46 It can be found that the intensities of the two peaks decrease gradually when N 2 is introduced, suggesting that the non-chemically adsorbed CO is taken away under the N 2 ow. Aer N 2 purging, the characteristic peak of adsorbed CO appears at 2109 cm À1 , which reects that the CO is adsorbed linearly on Cu + (Cu + -CO).…”

“…Aer N 2 purging, the characteristic peak of adsorbed CO appears at 2109 cm À1 , which reects that the CO is adsorbed linearly on Cu + (Cu + -CO). 20,47 The peak intensity of adsorbed CO decreases rapidly aer the introduction of O 2 , indicating the rapid conversion of CO on the surface of Cu/CeO 2 . Besides, the IR peaks in the range of 1700-1000 cm À1 are due to the diverse vibrations of carbonates and formates.…”

“…It may be due to the fact that the pre-exponential factor value of Ni/CeO 2 (1.19 × 10 11 h −1 ) was much higher than that of Co/CeO 2 (2.24 × 10 10 h −1 ), which suggests a higher density of active sites for the CO oxidation. 20 …”

“…Interestingly, the transition metal acetylacetonates (M(acac) x ) have been proved to be a good precursor for element doping. [20][21][22] For example, based on the hydrogen bonding interaction and ligand exchange mechanism, Kuśtrowski et al successfully loaded Cu(acac) 2 , Fe(acac) 3 , and Cr(acac) 3 on siliceous support. 21 The research conducted by Vital et al also revealed that M(acac) x can be immobilized on aminofunctionalized active carbon support.…”

“…Interestingly, although the E a over Ni/CeO 2 is higher than that over Co/CeO 2 , Ni/CeO 2 exhibits better catalytic performance. It may be due to the fact that the pre-exponential factor value of Ni/ CeO 2 (1.19 Â 10 11 h À1 ) was much higher than that of Co/CeO 2 (2.24 Â 10 h À1 ), which suggests a higher density of active sites for the CO oxidation 20. Furthermore, we also investigated the catalytic activity of Cu/ CeO 2 prepared by co-precipitation (dened as Cu/CeO 2 (cp)), as shown in Fig.S2.…”