Viability of Au/CeO₂–ZnO/Al₂O₃ Catalysts for Pure Hydrogen Production by the Water–Gas Shift Reaction

Abstract

Light‐trapping schemes implemented with ultrathin, 3 μm thick silicon solar cells offer excellent opportunities for greatly enhanced absorption and corresponding improvements in efficiency of operation. Optically optimized cells of this type yield energy conversion efficiencies that are higher by ≈190% compared to otherwise identical cells that do not exploit light‐trapping features, consistent with optical modeling results.

Ni-CeO2/C Catalysts with Enhanced OSC for the WGS Reaction

“…Even though carbon is not playing a chemical role in the oxygen storage process, it acts as an ideal media to support ceria nanoparticles providing high surface area (as shown in Table 1). Similar results were obtained when CeO2 is dispersed over gamma alumina [15]. In this sense, dispersing ceria over a high-surface carrier opens up the possibility of having higher surface/bulk ratios thus improving the oxygen mobility no matter the used support.…”

“…In this sense, dispersing ceria over a high-surface carrier opens up the possibility of having higher surface/bulk ratios thus improving the oxygen mobility no matter the used support. However it is worth noting that our ceria/carbon based samples present higher OSCC values than those observed for ceria/alumina systems measured under the same conditions [15]. The latter indicates the suitability of carbon as a textural promoter allowing better dispersion of ceria nanoparticles.…”

Au/CeO2 Catalysts: Structure and CO Oxidation Activity

“…Moreover, the dispersion of gold over support surfaces has been shown to be dependent on the oxygen vacancies population within the oxide [11,15,17,20,51,57,127,[140][141][142][143][144]. Rodríguez et al [139] evidenced via Scanning Tunneling Microscopy (STM) the presence of oxygen vacancies in a model catalyst formed by CeO 2 nanoparticles dispersed on the (111) surface of a gold single crystals.…”

“…Furthermore, the use of alumina as a main support provides several advantages. Dispersing ceria over a high-surface carrier such as alumina results in higher surface-to-bulk ratios, which leads to enhanced OSC of the samples [140]. At the same time, this catalyst configuration only requires a small amount of ceria, which reduces the expense of cerium oxide considerably.…”

Multicomponent Au/Cu-ZnO-Al2O3 catalysts: Robust materials for clean hydrogen production

“…However, these catalysts present an important disadvantage -their pyrophoricity. The use of noble metals is also broadly studied as alternative to Cu based catalysts [6,[9][10][11]. All Pt group based catalysts work at suitable temperature to be successfully considered but need special conditions of pre-treatment and show important deactivation, if water condensation occurs abruptly during shutdown [12,13].…”