Cyclic CO2 chemisorption–desorption behavior of Na2ZrO3: Structural, microstructural and kinetic variations produced as a function of temperature

Spray‐Dried Sodium Zirconate: A Rapid Absorption Powder for CO2 Capture with Enhanced Cyclic Stability

“…Their 20 cycle sorption/desorption studies were conducted in 100 % CO 2 (as opposed to 15 % herein): temperatures between 550 and 700 °C were found to give the highest uptakes; desorption in N 2 was conducted at ≤800 °C. Sorption‐dwell times of 30 minutes were adopted, the samples exhibited CO 2 uptakes corresponding to 18.5–19 mass % . Our SS powder exhibited similar uptake after similar total time periods to these reports (Figure ) but we adopted a shorter (5 minute) carbonation period in multicycle TGA as this replicated more closely the conditions of a working sorbent.…”

“…There are a number of literature reports of Na 2 ZrO 3 as a sorbent for CO 2 : the conditions used for sorption/desorption vary between the different publications. Martínez‐dlCruz and Pfeiffer prepared Na 2 ZrO 3 by a similar SS route to our SS powder but with calcination at 850 °C for 6 h and found that addition of 20 % excess Na 2 ZrO 3 produced a phase‐pure product (by XRD). The surface area of this product was approximately 3 m 2 g −1 , comparable to the surface area of the SS powder presented herein.…”

Effects of sodium precursors and gelling agents on CO2 sorption performance of sodium zirconate

“…Fragmentation of particles was also observed in a previous work where Na 2 ZrO 3 sorbent was tested for 20 cycles of CO 2 sorption. [28] The voids seen in these fragmented particles in sample CA2_EG1 paved way for CO 2 diffusion through these particles and thus resulted in maintaining its stability throughout multiple cycles of CO 2 sorption. This proves that the Pechini sol-gel method significantly affects the formation of a stable particle structure of Na 2 ZrO 3 when exposed to continuous changes in the alternating carbonationregeneration temperatures, unlike sample NaCA which was prepared by simple liquid-state reaction.…”

“…Similar observation was found in a previous work, where either cubic or tetragonal ZrO 2 was formed at carbonation temperatures of 500-600°C. [28] XRD patterns of sample CA2_EG1 before and after CO 2 adsorption process are plotted in Fig. 6.…”

Enhanced hydrogen production from thermochemical processes

“…236,317,318 Na2ZrO3 has been regarded as a kinetically fast and stable CO2 acceptor with a decent CO2 capacity (0.238 g-CO2/gsorbent). 316,326,327,[333][334][335] Furthermore, it has been known to exhibit some catalytic ability for CO oxidation as well as methane reforming. 336,337 Aceves Olivas et al 315 demonstrated a maximum of 92.2% purity H2 via steam ethanol reforming at 1×10 5 Pa, with a S/C ratio of 3 at 600 o C in a fixed-bed reactor using a combination of this sorbent and Ni/Al2O3 catalyst.…”