Controlling carbon formation over Ni/CeO2 catalyst for dry reforming of CH4 by tuning Ni crystallite size and oxygen vacancies of the support

A Study of How LaFeO3 and CaTiO3 Supports Affect the Oxidation, Hydrogenation, and Methane Steam Reforming Activity of Pt and Ni Catalysts

“…The coking tolerance observed in a previous study is likely due to the morphology of the of the Ni particles on CaTiO 3 . 31 The present study also provided additional evidence that thin-film perovskites interact with supported metals in a manner similar to that which occurs in bulk systems. In addition to the fact that catalysts oxidized at high temperatures were inactive and reduced materials were active for CO oxidation, reduced Pt catalysts on both bulk and thin-film LaFeO 3 were inactive for hydrogenation reactions.…”

“…There was no evidence for decomposition of CaTiO 3 upon high-temperature reduction or Ti migration to Ni in STEM as there was with Pt. The coking tolerance observed in a previous study is likely due to the morphology of the of the Ni particles on CaTiO 3 …”

Surface anchored atomic cobalt-oxide species coupled with oxygen vacancies boost the CO-production yield of Pd nanoparticles

“…Such a scenario can be attributed to the higher carbon retention on the OV sites in the absence of H 2 . 34–36 In addition, the CH 4 production yields of CoPd–CoO OV and reference samples in a pure CO 2 gas are obtained for clarifying the possible contribution of C–H bonds (formed during surface functionalization) of the carbon support during CO 2 conversion, as shown in Fig. 6b.…”

Ni/Co in and on CeO2: a comparative study on the dry reforming reaction

“…It is well known that vacancies and oxygen defects play a significant role in the dry reforming process, therefore an increase in defects is advantageous. 85 Oxygen vacancies may increase CO 2 adsorption and control the C–H activation on the catalyst surface 86 which is a critical stage in the dry reforming mechanism. Vacancies can also easily absorb and dissociate CO 2 into CO. Zhikun Peng et al 86 have shown that a higher concentration of oxygen vacancies in the catalyst helps to remove the deposited carbon by the activation of CO 2 to create O ad , which simultaneously eliminated the carbon deposition and maintained the high activity.…”