Effects of steam on CO_2 absorption ability of calcium-based sorbent modified by peanut husk ash

• 作 者: LIU Yang YANG XinFang ZHAO LiFeng LEI FuLin XIAO YunHan
• 机 构: University of Chinese Academy of Sciences,Key Laboratory of Advanced Energy and Power, Institute of
• 出 处: Science China(Technological Sciences)
• 发表日期: 2017年06期
• 关键词: sorbent calcination hydration steam porosity apparent enough depressed recover k

The CO_2 absorption ability of synthetic calcium-based sorbent modified by peanut husk ash (PHA) was tested by Thermal Gravimetric Analyzer (TGA), and the effects of steam and calcination temperature were investigated. The PHA composition was analyzed by X-Ray Fluorescence (XRF), the apparent morphology was characterized by scanning electron microscope (SEM), and the phases of the sorbent before and after calcination were examined by X-ray diffraction (XRD). The addition of PHA effectively improved the cyclic stability of the calcium-based sorbent. The optimal molar ratio of SiO_2 in PHA to CaO was around 0.07. Steam had positive effect on keeping porosity of the sorbent at the chemical reaction stage, and improved its CO_2 absorption ability. Steam also reduced the diffusion resistance of the product layer, and depressed the influence of high temperature calcination. It was also found that the steam hydration after calcination was an effective way to recover the absorption ability of the sorbent, while the hydration duration of 10 min was enough.

The CO 2 absorption ability of synthetic calcium-based sorbent modified by peanut husk ash (PHA) was tested by Thermal Gravimetric Analyzer (TGA), and the effects of steam and calcination temperature were investigated. The PHA composition was analyzed by X-Ray Fluorescence XRF), the apparent morphology was characterized by scanning electron microscope (SEM), and the phases of the sorbent before and after calcination were examined by X-ray diffraction (XRD). The addition of PHA effectively improved the cyclic stability of the calcium- based sorbent. The optimal molar ratio of SiO_2 in PHA to CaO was around 0.07. Steam had positive effect on keeping porosity of the sorbent at the chemical reaction stage, and improved its CO 2 absorption ability. , and depressed the influence of high temperature calcination. It was also found that the steam hydration after calcination was an effective way to recover the absorption abilit y of the sorbent, while the hydration duration of 10 min was enough.