Inverse CeO2/CuO catalysts prepared from heterobimetallic metal–organic framework precursor for preferential CO oxidation in H2-rich stream

Sword-like CuO/CeO2 composites derived from a Ce-BTC metal–organic framework with superior CO oxidation performance

“…In addition, the intensity ration of the satellite peaks to the principal peaks determinates the reduced degree of Cu species (I sat / I pp ¼ 0.57 in bulk CuO). 22 As shown in Table 1 and S2, † CuCeO-5 has lowest the value of the intensity ratio (I sat /I pp ¼ 0.37) than other four catalysts, which indicates the reduced degree of Cu species is highest. Fig.…”

“…Recently, owing to unique physicochemical properties, low cost and high catalytic performance, a series of CuO/CeO 2 catalysts were synthesized by thermal annealing treatment of MOFs. [19][20][21][22] At present, in order to synthesize CuO/CeO 2 catalysts, Cu or Ce metal salt was incorporated into the Ce or Cu MOFs by impregnation method. It was found that irregular CuO/CeO 2 aggregated nanocrystals formed through direct calcination of MOFs dipping metal salts.…”

CuAlCe Oxides Issued from Layered Double Hydroxide Precursors for Ethanol and Toluene Total Oxidation

“…In line with the literature, it is reported that the higher Cu 2p 3/2 binding energy and the satellite peak are two most important XPS characteristics of Cu 2+ species. Meanwhile, the lower Cu 2p 3/2 binding energy and absence of the shake-satellite peak are characteristic of reduced copper species (Cu + and Cu 0 ) [26,37,38]. Thus, Cu species initially existing in these samples are mainly in divalent oxidation states (Cu 2+ ).…”

“…A recent study has shown that the addition of cerium in the CuAl hydrotalcite-like material improves activity and selectivity towards NO selective catalytic reduction by lowering the temperature of carbon monoxide oxidation [25]. In addition, cerium incorporation has already been studied and tends to favor the reduction of metal cations in the catalyst based on mixed oxides prepared via the hydrotalcite route, which could lead to an increase in the catalytic activity [26]. Thus, in this work, a new and original approach is to combine cerium with Cu-Al materials using the LDH synthesis approach.…”

Multishell hollow CeO2/CuO microbox catalysts for preferential CO oxidation in H2-rich stream

“…Simultaneously, an important decrease in H 2 oxidation activity, with consequent increase in the selectivity to CO 2 , is produced in the presence of larger CuO particles [10]. However, the preparation of the inverse CeO 2 /CuO has been a challenge because the high concentration of Cu 2+ can promote the severe agglomeration of CuO species, which would become bulk CuO during calcination [11,12]. That would decrease the number of copper-ceria interfacial sites, resulting in a poor performance in the CO-PROX reaction.…”