Pelletization and attrition of CaO‐based adsorbent for CO₂ capture

Abstract

CaO‐based adsorbent pellets from limestone and carbide slag powder were prepared by an extrusion–spheronization method. Three types of binder and peptizer materials were introduced to improve the adsorption performance and mechanical properties of adsorbent pellets. Weibull statistics was employed to analyze the compressive stress of adsorbent pellets. The results revealed that pseudo‐boehmite and nitric acid were the favorable choice of binder and peptizer for preparing CaO‐based adsorbent pellets with enhanced chemical and mechanical properties. The addition of pseudo‐boehmite (PB) improved the pore distribution characteristics by increasing the pores within 10–100 nm, and the addition of nitric acid brought favorable mechanical reliability by providing a large amount of H+, thereby interacting with multiple PB particles to form a network structure. It was shown that when 3 wt.% pseudo‐boehmite and 15 wt.% nitric acid were used, the favorable performance of the molding pellets could be obtained (carbonation conversion: 36%, compressive stress: 25.3 MPa; attrition rate: 0.46 wt.%/hr), which had promising prospects for practical CO2 removal.

A Study of ZSM-5 Molecular Sieve Shaping for an Innovative Cyclohexene Hydration Process

“…As can be seen from the table, the coefficients of determination, R 2 , for the five samples are, in order, 0.977, 0.974, 0.989, 0.982, and 0.971. their values are close to 1, indicating that the mechanical strength of the ZSM-5 extruded strip folding body can obey the Weibull distribution well [32]. The higher the fracture load at a specific low failure probability, the higher the mechanical strength reliability of the pellet.…”

A study of ZSM-5 molecular sieve shaping for an innovative cyclohexene hydration process

“…Figure 1 2. As can be seen from the table, the coe cients of determination, R 2 , for the ve samples are, in order, 0.977, 0.974, 0.989, 0.982, and 0.971. their values are close to 1, indicating that the mechanical strength of the ZSM-5 extruded strip folding body can obey the Weibull distribution well [33]. The higher the fracture load at a speci c low failure probability, the higher the mechanical strength reliability of the pellet.…”

Scalable Preparation of Sub-Millimeter Double-Shelled Al2O3 Hollow Spheres and Their Rapid Separation from Wastewater after Adsorption of Congo Red

“…Because H + generated by the ionization of nitric acid solution reacts with the hydroxyl group of pseudoboehmite to form positively charged colloid. The colloid will attract other pseudoboehmite and form a network connection, which will reduce the fluidity of particles and turn them into sol . The network connection between pseudoboehmite treated with 0.1 mol/L nitric acid is relatively less, resulting in small pore sizes and poor pore uniformity.…”

“…The colloid will attract other pseudoboehmite and form a network connection, which will reduce the fluidity of particles and turn them into sol. 42 The network connection between pseudoboehmite treated with 0.1 mol/L nitric acid is relatively less, resulting in small pore sizes and poor pore uniformity. However, after being treated with 0.3 mol/L nitric acid, they will undergo sufficient gelation reaction, the original accumulation of pseudoboehmite will be destroyed, and the micropores will increase and combine into nonuniform macropores.…”