In situ catalyst activity control in a novel membrane reactor—Reaction driven wireless electrochemical promotion of catalysis

Hydration, CO2 stability and wireless electrochemical promotion studies on yttria-doped Ba (Ce, Zr) O3 perovskites

“…It is interesting to note that the phenomenon is rapidly reversed upon re-introduction of the Arsweep. This is very different from the behaviour previously [18][19][20][21][22] but similar to that observed for the case of a mixed protonic electronic conductor (Sr 0.97 Ce 0.9 Yb 0.1 O 3 − α ) [23] used for the modification of Pt catalytic activity for ethylene oxidation. In the case of the mixed oxygen-electronic conductor, the catalytic rate remained to the promoted state upon re-introduction of the inert gas sweep, while in the case of the mixed protonoxygen ion conductor, there was also a rapid restoration.…”

“…Upon introduction of the H 2 /H 2 O flow on the sweep side of the reactor, a chemical potential difference of hydrogen species across the membrane is created. This will act as the driving force for these species to migrate across the membrane and spillover on the catalyst surface to impose a similar modification to the catalytic rate as in classic EPOC [18][19][20]. The effect on the catalytic rate (promotion or poisoning) depends on the nature of the promoting species (electronegative and electropositive) and the adsorption status of the reactants.…”

“…In addition, for supports with mixed ionic and electronic conductivity (such as BCZY), a wireless configuration has also been proposed by Poulidi et al [18][19][20][21][22][23] utilising a chemical potential difference of the promoting species across a dense membrane supporting the catalyst. Wireless EPOC has been observed using both mixed oxygen ion and electronic conductors [18][19][20][21][22] or mixed protonic and electronic conductors [23] in different reactor configurations. In this work, the most promising composition of BCZY evaluated in terms of stability under CO 2 environments was used for the wireless EPOC of CO oxidation on a Pt catalyst.…”

Determination and perturbation of the electronic potentials of solid catalysts for innovative catalysis

“…36 Such a change in the WF alters the activation energy of the reaction, resulting in improved thermalcatalytic performance in a reversible manner compared to that without the applied voltage. [39][40][41][42] As one example, the hydrogenation of CO 2 over Ru deposited on a proton-conducting oxide (BaZr 0.85 Y 0.15 O 3Àa + 1 wt% NiO) has been investigated. 41,43 Their study showed that positively polarizing the WF removed the proton promoter and, in turn, enhanced thermal-catalytic CH 4 formation and suppressed the CO formation rate, while negatively polarizing the WF resulted in an opposite manner.…”

Improving the Signal Propagation at 2.4 GHz Using Conductive Membranes

“…Poulidi et al [12] used membrane reactors for "wireless" electrochemical promotion. They employed a dual chamber membrane reactor for the control of catalyst activity.…”