Coke-free methane dry reforming over nano-sized NiO-CeO2 solid solution after exsolution

Highly active and stable Ni dispersed on mesoporous CeO2-Al2O3 catalysts for production of syngas by dry reforming of methane

“…The control of Ni particle size plays an important role on the prevention of carbon deposition and catalyst stability during DRM reaction [12,58,59]. Therefore, different catalyst preparation methods have been proposed in the literature to produce small and stable metal particles [26,[59][60][61]. The encapsulated structures, for example core-shell and mesoporous catalysts, have been extensively studied to develop stable catalysts for DRM [62,63].…”

Emergence and Future of Exsolved Materials

“…Interestingly, increasing exsolved Ni surface area resulted in increased C 2 H 6 conversion but decreased C 2 H 4 /H 2 selectivity, which implies that the activity is probably dictated by a balance between the state of the ions in the bulk (i.e., Ni 2+ , Mn 4+ ), the amount of Ni exsolved and the presence of oxygen vacancies. [102] Despite the fact that complex perovskite structures are usually employed as parent materials to exsolve from, exsolved Ni particles have also been demonstrated to emerge from simple oxides such as CeO 2 , [99] MgO, [97] or MnO 2 [98] in catalytic applications despite not being able to accommodate a variety of cations in their lattices. Ni released on the surface of such oxides can exhibit high activity and stability as well as coke free operation.…”

“…Ni exsolution is also widely used in catalytic applications such as the transformation of hydrocarbons into valuable products especially in areas such as methane reformation or production. [ 95–99 ] This is not surprising since Ni‐containing catalysts are often considered to be state of the art for the reformation of a range of hydrocarbons ( Figure ). [ 100 ] Exsolved nickel catalysts have been employed for the conversion of some higher hydrocarbons such as ethanol [ 101 ] and ethane.…”

Progress and Opportunities for Exsolution in Electrochemistry

“…Several studies have shown that the exsolution of particles occurred preferentially at 2D defects such as grain boundaries [58,68,74,75] and Ruddlesden-Popper stacking faults [43,76]. In-situ TEM has shown that such defects serve as nucleation sites and, consequently, nuclei can be found to form in these locations at lower temperatures compared to the defect-free regions of the same material [43].…”