Investigation of Zr‐doped ceria for solar thermochemical valorization of CO ₂

Abstract

This study belongs to the estimation of the CO 2 conversion ability of Ce 1 −x Zr x O 2 (CZ) materials performing multiple thermogravimetric CO 2 splitting (CDS) cycles. By varying the molar concentrations of Zr in the range of 0.05 to 0.5, the CZ materials were prepared by using co-precipitation method. By employing various analytical methods, the physical properties such as phase and elemental composition, crystallite size, and particle morphology of the assynthesized CZ materials were recognized. The systematic estimation of the reactivity of each CZ material was performed by conducting multiple cycles in a thermogravimetric analyzer (TGA). Obtained findings indicated that Ce 0.7 Zr 0.3 O 2 (CZ30) and Ce 0.85 Zr 0.15 O 2 (CZ15) were proficient towards producing maximum amounts of O 2 (n O 2) and CO (n CO) than other CZ materials. It was further understood that, to achieve higher n O 2 and n CO as compared with CeO 2 , the molar concentration of the Zr should be in the range of 15% to 35%.

Recent Developments in Ceria-Driven Solar Thermochemical Water and Carbon Dioxide Splitting Redox Cycle

“…Takalkar and Bhosale [82] examined various combinations of co-precipitation-synthesized Zr-doped ceria for thermochemical CDS by using a TGA setup. XRD analysis indicated that the crystallite size of the Zr-doped ceria was increased with a rise in the dopant concentration.…”

Porous Zr-Doped Ceria Microspheres for Thermochemical Splitting of Carbon Dioxide

“…10−13 Takalkar et al have studied a wide range of Zr-doping concentrations (0−50 mol %) on the CO production yield. 14 They concluded that the optimal doping concentration of the Zr could be in the range of 15 to 35 mol %. 15 However, some studies argue that although a high Zr doping concentration (e.g., >10 mol %) increases the reduction capacity the dopant will slow down the reaction rate.…”

“…Many studies have been carried out to investigate the effect of Zr doping concentration on the production capacity and reaction rate of the two-step CO 2 splitting. The doping concentration was mainly within 20 mol %. − Recently, Takalkar et al have studied a wide range of Zr-doping concentrations (0–50 mol %) on the CO production yield . They concluded that the optimal doping concentration of the Zr could be in the range of 15 to 35 mol % .…”

A solar thermochemical praseodymium sesquioxide assisted CO 2 splitting cycle

“… 20 Likewise, CNRS‐PROMES, France was considerably involved in the testing of the SnO 2 /SnO cycle 17,19 . Non‐volatile mixed MOs such as ferrites, 21‐29 doped ceria, 30‐39 and perovskites 40‐49 were also inspected heavily by various researchers worldwide. The primary focus in the case of both volatile and non‐volatile MOs was (a) synthesis of materials, (b) design and testing of the solar reactor system, (c) thermodynamic efficiency analysis, (d) kinetics of both thermal reduction and re‐oxidation reactions, (e) investigation of the thermal stability of the metal oxides, and (f) economic analysis.…”