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

ABSTRACT: Improved powders for capturing CO2 at high temperatures are required for H2 production using sorption-enhanced steam reforming. Here, we examine the relationship between particle structure and carbonation rate for two types of Na2 ZrO3 powders. Hollow spray-dried microgranules with a wall thickness of 100-300?nm corresponding to the dimensions of the primary acetate-derived particles gave about 75?wt?% theoretical CO2 conversion after a process-relevant 5?min exposure to 15?vol?% CO2 . A conventional powder prepared by solid-state reaction carbonated more slowly, achieving only 50?% conversion owing to a greater proportion of the reaction requiring bulk diffusion through the densely agglomerated particles. The hollow granular structure of the spray-dried powder was retained postcarbonation but chemical segregation resulted in islands of an amorphous Na-rich phase (Na2 CO3 ) within a crystalline ZrO2 particle matrix. Despite this phase separation, the reverse reaction to re-form Na2 ZrO3 could be achieved by heating each powder to 900?°C in N2 (no dwell time). This resulted in a very stable multicycle performance in 40?cycle tests using thermogravimetric analysis for both powders. Kinetic analysis of thermogravimetric data showed the carbonation process fits an Avrami-Erofeyev 2?D nucleation and nuclei growth model, consistent with microstructural evidence of a surface-driven transformation. Thus, we demonstrate that spray drying is a viable processing route to enhance the carbon capture performance of Na2 ZrO3 powder.

SUBMITTER: Bamiduro F 

PROVIDER: S-EPMC5516178 | biostudies-other | 2017 May

REPOSITORIES: biostudies-other