Structure and size effects on the catalytic properties of complex metal oxide compositions in the oxidative conversion of methane

Silicate anodic coatings on aluminum containing oxides of cobalt and/or copper and/or cerium and their activity in CO oxidation

“…5) is in agreement with the literature data [33,34]. For instance, the authors of [34] showed that high activity of CuO/CoO/CeO 2 catalysts in the reaction of selective CO oxidation was caused by strong interac tion of deposited copper and cobalt oxides with cerium dioxide with the formation of Cu-Co-Ce-O clusters on the surface.…”

Review on the catalytic tri-reforming of methane - Part II: Catalyst development

“…820 • C), as evidenced by TPR. The reduction of the first two Ni species are generally possible under H 2 resulting in the formation of zero-valent Ni which is active in methane reforming, albeit spinel NiAl 2 O 4 , usually formed at high calcination temperatures, is inactive in methane reforming [57,77,82], and its content can reach up to 90 % of the nickel species [83]. Thus, even if the reduction of NiAl 2 O 4 is difficult and requires harsh conditions (temperature ca.…”

“…For other alkali and alkaline earth metals, no clear common trend was observed. Orlyk et al [82] indicated that the addition of K 2 O and Na 2 O to Ni/Al 2 O 3 improved Ni dispersion and thus enhanced catalyst activity. In contrast, García-Vargas et al [106] pointed out that Na(I), K (I) and Ca(II) were not useful for Ni/β-SiC because they enhanced the oxidation rate of this support into SiO 2 during calcination, thus modifying the catalyst structure.…”

“…The addition of La 2 O 3 or CeO 2 to TRM catalysts enhances their catalytic activity by increasing MSI, increasing basicity for CO 2 adsorption, and limiting catalytic deactivation by re-oxidation of Ni(0) [19,82,53,121]. Pino et al [53] studied the influence of La(III) loading on the performance of Ni/CeO 2 catalyst.…”

“…Strong basic sites, created by La 2 O 3 , promoted CO 2 adsorption which favored coke elimination. Orlyk et al [82] and Solov'ev et al [19] reported that CeO 2 and La 2 O 3 addition avoided catalytic deactivation by providing high O-vacancies for coke gasification and promoting Ni reduction capacity. Zou et al [121] stated that the addition of La(III) to NiMo carbide prevented Ni particles from sintering, and suppressed carbon deposition, which explains the high catalytic performance of these catalysts.…”