Abstract:We
report on the activation of CO
2
on Ni single-atom
catalysts. These catalysts were synthesized using a solid solution
approach by controlled substitution of 1–10 atom % of Mg
2+
by Ni
2+
inside the MgO structure. The Ni atoms
are preferentially located on the surface of the MgO and, as predicted
by hybrid-functional calculations, favor low-coordinated sites. The
isolated Ni atoms are active for CO
2
conversion throug… Show more
“…The Lewis basicity of adsorption sites was studied using the adsorption enthalpy of CO 2 as probed by microcalorimetry. 53 In Fig. 14, the amount of adsorbed CO 2 on ZnO and ZnO_F1 are shown.…”
Section: Investigation Of the Electronic Properties Of Fluorine Treatmentioning
The structure, electronic properties, and surface acidity of polycrystalline ZnO are modified using F2(g). The amount of F incorporated influences the samples' properties, which were studied using, e.g., FT-IR, XPS, TEM, NMR, and microcalorimetry.
“…The Lewis basicity of adsorption sites was studied using the adsorption enthalpy of CO 2 as probed by microcalorimetry. 53 In Fig. 14, the amount of adsorbed CO 2 on ZnO and ZnO_F1 are shown.…”
Section: Investigation Of the Electronic Properties Of Fluorine Treatmentioning
The structure, electronic properties, and surface acidity of polycrystalline ZnO are modified using F2(g). The amount of F incorporated influences the samples' properties, which were studied using, e.g., FT-IR, XPS, TEM, NMR, and microcalorimetry.
“…The CO conversion for the Ni/SiO 2 (pyrolysis) is clearly higher than that of the Ni/SiO 2 (calcination) -reduced catalyst which can be attributed to a lower size of the Ni nanoparticles. Although single atom Ni species are also observed in the Ni/SiO 2 (pyrolysis) catalyst, they have been reported to be unable to hydrogenate CO to CH 4 24 and we expect that only the metallic Ni nanoparticles are the active sites for CO methanation. The activity of the Ni/SiO 2 (pyrolysis) catalyst is still low at a lower temperature (r300 1C), because the Ni nanoparticles are coated with carbon, making many of the sites inaccessible for the reaction.…”
In situ generated protective carbon layers from metal precursor pyrolysis produce a highly dispersed Ni catalyst by restricting the metal mobility and agglomeration.
“…Another strategy is to fabricate MOF-derived electrocatalysts by means of direct pyrolysis of MOF and MOF-based composites [17,111] . The strategy contributes to the formation of homogeneously distributed metal nanoparticles or/and singe atom throughout the whole skeleton, together with abundant defects within graphitic carbon matrix, which promote the contact between dissolved CO 2 and active sites [112][113][114] .…”
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