Boosting CO2 hydrogenation via size-dependent metal–support interactions in cobalt/ceria-based catalysts

Abstract

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Development of a Ba–CoCe catalyst for the efficient and stable decomposition of ammonia

“…The reduction of CeO 2 in the presence of Co, as a result of the hydrogen spillover from metallic cobalt to ceria has been previously reported. 32,[39][40] In that case, part of the H 2 uptake would correspond to the reduction of ceria, resulting in slightly lower reduction degree for Co with respect to the values shown in Table 2. In order to accurately evaluate the surface of the active phase (metallic Co), H 2 chemisorption experiments were conducted.…”

“…The ratio Ce 3+ /Ce 4+ slightly increases after the reduction treatment (Table 4), consistent with a partial reduction of the CeO 2 , in agreement with previously reported observations. 32,39 Slightly more CeO 2 has been reduced in the case of the sample without Ba. In the Ce 3d spectrum correspondent to the sample with Ba, a slight broadening of the peaks is observed that could be related to a decrease in the ceria particle size.…”

“…This result suggests that Ce retards the reduction of cobalt oxide, in agreement with previous studies. 32,[38][39] On the other hand, the addition of Ba results in an increase of the H 2 uptake, and a higher reduction degree is observed. Therefore, we can conclude that barium facilitates the reduction of cobalt and/or cerium.…”

Direct observation of the evolving metal–support interaction of individual cobalt nanoparticles at the titania and silica interface

“…Severe aggregation has previously been reported to adversely affect catalytic performance resulting in low activity and poor C 5 + selectivity and stability. [69][70][71] We note that the interfacial compounds are still present in the CoNPs (i.e. a small L I 3 feature in the Co L 3edge XAS data shown in Fig.…”

Nanostructured Cobalt‐Based Electrocatalysts for CO2Reduction: Recent Progress, Challenges, and Perspectives

“…Among TM elements, Co with promising catalytic activity shows great potential toward CO 2 RR. [ 37 ] The literature summarizing the advance and opportunities of Co‐based catalysts for ECO 2 RR could provide a broad view of the development. In this review, we highlight the Co‐based electrocatalysts, from fundamentals to the catalyst design, for the efficient ECO 2 RR.…”