Conductive ZSM-5-Based Adsorbent for CO2 Capture: Active Phase vs Monolith

Abstract

Among microporous adsorbents, zeolites constitute the reference materials in CO2-capture technologies, because of their high CO2 affinity, high chemical and thermal stability, and low cost. Being synthesized in powder form, they need to be shaped in pellets or monolith to be suitable for real applications. The process has a direct effect on CO2-capture properties of the material creating, in this sense, substantial differences between lab-scale (adsorbents) and plant-scale systems (adsorbers). The ability of the honeycomb monolith to efficiently separate gases of interest arises from the properties of its single components such as an active phase and a phase resulting from the decomposition of a binder. Moreover, the textural (i.e., pore distribution and exposed surface) and structural properties (e.g., amorphization) of the active phase can be modified in the conditions adopted during the process that leads to the final artifact. These modifications can affect the CO2-capture performances of the active p...