The Role of Water on the Performance of Calcium Oxide‐Based Sorbents for Carbon Dioxide Capture: A Review

Abstract

A technology using calcium oxide (CaO)‐based sorbents for CO2 capture has been identified to be the optimal candidate for capturing CO2 at high temperature. Realistic gases always contain water vapor and many other components, and it has been reported that these wet conditions have a non‐negligible influence on the performance of the sorbent. This Review outlines the role of H2O during the CO2 capture process using CaO‐based sorbents. The role of steam/H2O in sorbent reactivation, the effect of steam on carbonation and calcination, and the influence of steam when simultaneously existing in both carbonation and calcination stages are discussed. It is suggested that injection of steam in both carbonator and calciner is a good strategy to achieve better reactivity of the CaO‐based sorbent for CO2 capture. The mechanisms of the effect of steam in carbonator and calciner on CO2 capture are also discussed. The Review concludes with future research directions.

Hydrogen-rich gas production from wet biomass steam gasification with CaO/MgO

“…carbonation of CaO and the subsequent decomposition of CaCO 3 by calcination to regenerate the sorbent in order to be reused in a long-series cyclic process [13,14]. Addition of calcium oxide during gasification leads to breaking of thermodynamic equilibrium constraint and enhances hydrogen production [15].…”

“…Wei et al [12] investigated the effect of limestone, olivine and dolomite on biomass gasification at temperature range of 750e850 C, and found that dolomite showed better performance in terms of catalytic activity on tar destruction. The capture of CO 2 is based on the carbonation of CaO and the subsequent decomposition of CaCO 3 by calcination to regenerate the sorbent in order to be reused in a long-series cyclic process [13,14]. Addition of calcium oxide during gasification leads to breaking of thermodynamic equilibrium constraint and enhances hydrogen production [15].…”

“…The capture of CO 2 is based on the * Corresponding authors. ScienceDirect j o urn al h om epa ge: www.elsev ier.com/locate/he i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y x x x ( 2 0 1 5 ) 1 e8 http://dx.Please cite this article in press as: Zhang B, et al, Hydrogen-rich gas production from wet biomass steam gasification with CaO/ MgO, International Journal of Hydrogen Energy (2015), http://dx.doi.org/10.1016/j.ijhydene.2015.05.075carbonation of CaO and the subsequent decomposition of CaCO 3 by calcination to regenerate the sorbent in order to be reused in a long-series cyclic process [13,14]. Addition of calcium oxide during gasification leads to breaking of thermodynamic equilibrium constraint and enhances hydrogen production [15].…”

Influence of Environmentally Friendly and High-Efficiency Composite Additives on Pulverized Coal Combustion in Cement Industry

“…From the overall trend, A + A1 showed the best effect on reducing the release of SO 2 . The reason was that 47.83% CaO existed in A1 (Table 2), and the reaction (4) happened as follows [16]. Therefore, A + A1 worked best…”

Improved Sorption‐Enhanced Steam Methane Reforming via Calcium Oxide–Based Sorbents with Targeted Morphology

“…Current research efforts to improve the utilization and durability of CaO‐based sorbents include i) the synthesis of calcium‐based sorbents from organic and inorganic precursors (instead of naturally derived CaO sources); ii) doping CaO with various metals; and iii) post‐treating the sorbents in an attempt to increase their lifespan . Studies by Martavaltzi et al on mixtures of mayenite, Ca 12 Al 14 O 33 , and CaO show that aluminum is an attractive additive to improve the stability of calcium oxides, albeit at the expense of the sorption capacity.…”