In-depth impact evaluation of binders on the mechanical properties and CO2 capture performance of CaO-based particles

Shen，Xuehua1,2; Zhang，Ruiheng1; Su，Yiping1; Lin，Han1; Xie，Feng1; Cai，Yingying1; Li，Guanghuan1; Hua，Jiali1; Yan，Feng1,2; Quan，Zewei3; Zhang，Zuotai1,2

2024-06-01

10.1016/j.jece.2024.112853

Journal of Environmental Chemical Engineering   影响因子和分区

2213-3437

The industrial applications of CaO-based adsorbents for CO capture are limited by the challenges of serious sintering in a realistic regeneration condition and elutriation in the fluidized-bed reactors. Although the granulation of CaO-based adsorbents has been extensively investigated, the key indexes such as mechanical strength, adsorption performance, and cyclic stability were investigated independently rather than united for practical applications. Here, we systematically investigated the impacts of binders on the mechanical properties and CO capture performance of CaO-based particles granulated using the extrusion method. Among different commercial binders (cement, kaolin, and bentonite), only cement yielded calcined CaO-based particles with the required mechanical strength. At the optimal cement proportion (10%) and particle diameter (3 mm), the “CaO+Cement” particle achieved a compressive strength of ≥20 N and an attrition rate of ≤5%. After granulating, the “CaO+Cement” particle retained a favorable CO uptake of 458 mg/g within 10 min, and also exhibited excellent cyclic performance in a realistic regeneration condition (calcination at 920 °C in a CO atmosphere), with a decay rate of 0.9% per cycle during long-term cycles. After 50 cycles, the cumulative CO uptake for “CaO+Cement” particle was 9.44 g/g, representing a marked increase of 42.9% compared with that of the pure CaO particle. Owing to those multiple advantages of excellent mechanical strength, CO adsorption performance, cyclic stability and economic cost, the “CaO+Cement” particle (with a cement proportion of 10% and a diameter of 3 mm) appears to be a promising material for CO capture from industrial flue gas at large-scale.

Adsorption kinetics CaO-based particles CO2 capture Cyclic stability Mechanical strength

SCI ; EI

英语

第一 ; 通讯

2-s2.0-85191024773

Scopus

1.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City,Shenzhen,518055,China
3.Department of Chemistry,Southern University of Science and Technology,Shenzhen,518055,China

Shen，Xuehua,Zhang，Ruiheng,Su，Yiping,et al. In-depth impact evaluation of binders on the mechanical properties and CO2 capture performance of CaO-based particles[J]. Journal of Environmental Chemical Engineering,2024,12(3).

Shen，Xuehua.,Zhang，Ruiheng.,Su，Yiping.,Lin，Han.,Xie，Feng.,...&Zhang，Zuotai.(2024).In-depth impact evaluation of binders on the mechanical properties and CO2 capture performance of CaO-based particles.Journal of Environmental Chemical Engineering,12(3).

Shen，Xuehua,et al."In-depth impact evaluation of binders on the mechanical properties and CO2 capture performance of CaO-based particles".Journal of Environmental Chemical Engineering 12.3(2024).