Stepwise production of CO-rich syngas and hydrogen via solar methane reforming by using a Ni(II)–ferrite redox system

Modelling of solar thermochemical reaction systems

“…These calculations can provide great insight into mechanisms of the reaction pathway and the material properties that can limit or enhance active material performance. Recent works using DFT calculations to elucidate design principles for improved solar thermochemical cycle active materials have suggested that the thermodynamics of forming oxygen vacancies in a metal oxide lattice and the kinetics of conducting those vacancies (Kodama et al, 2008;Gokon et al, 2011;Kodama et al, 2005;Rydén et al, 2011;Alvani et al, 2005;Tamaura et al, 1998;Hwang et al, 2004;Miller et al, 2008;Fresno et al, 2009;Fresno et al, 2010;Arifin et al, 2012;Gokon et al, 2008b;Agrafiotis et al, 2015;Agrafiotis et al, 2012;Goikoetxea et al, 2016;Lorentzou et al, 2014;Cha et al, 2007;Kodama et al, 2002) to and from the surface are important in assessing material activity (Michalsky et al, 2015a,b;Ezbiri et al, 2015). Indeed, a study data mining first principles data from doped ceria studies identified surface oxygen vacancy formation energy as the primary descriptor that correlates with enhanced water splitting ability (Botu et al, 2016).…”

“…The studies on ferrite-based systems have shown that required reduction temperatures can be lowered by substituting metals such as manganese or nickel into ferrite based mixed metal oxides of the type M x Fe 3-x O 4 (Steinfeld, 2005). Co, Ni, Zn, Cu, and Mn substitutions into ferrite spinel structures have recently been used in successful hightemperature H 2 O/CO 2 splitting, suggesting that the M x Fe 3-x O 4 form of these mixed oxides is particularly active (Kodama et al, 2008;Gokon et al, 2011;Kodama et al, 2005;Rydén et al, 2011;Alvani et al, 2005;Tamaura et al, 1998;Hwang et al, 2004;Miller et al, 2008;Fresno et al, 2009;Fresno et al, 2010;Arifin et al, 2012;Gokon et al, 2008b;Agrafiotis et al, 2015;Goikoetxea et al, 2016;Lorentzou et al, 2014;Cha et al, 2007;Kodama et al, 2002). Other spinel structures are also of interest, such as the ''hercynite cycle" (Muhich et al, 2013 (Haussener et al, 2010c).…”

Redox reforming based, integrated solar-natural gas plants: Reforming and thermodynamic cycle efficiency

“…In addition to these single metal oxides, there has been interest in using bimetallic oxides including nickel, zinc, copper, and cobalt ferrites [25,26]. Studies have shown that using bimetallic oxides can lead to faster kinetics, higher quality syngas, and decreased carbon formation [25,26].…”

“…Studies have shown that using bimetallic oxides can lead to faster kinetics, higher quality syngas, and decreased carbon formation [25,26]. The reduction reactions for these bimetallic oxides are Figure 5 shows methane conversion using the original ferrite (magnetite) and the doped ferrites, calculated using the equilibrium constants (Table 5) calculated from Gibbs free energy of reaction found in [23].…”

Small Scale Hydrogen Production from Metal-Metal Oxide Redox Cycles

“…Some metal doped iron oxide oxygen carriers were also supported on ZrO2 for CL processes [29,[35][36][37]. Kodama et al [35,36] showed improved thermal resistance for the Ni-and Coferrites when ZrO2 support was introduced.…”