Layered double hydroxide derived bifunctional Ca-Fe-Mg material for integrated CO2 capture and utilization via chemical looping strategy
Layered double hydroxide derived bifunctional Ca-Fe-Mg material for integrated CO2 capture and utilization via chemical looping strategy
复制标题
层状双氢氧化物衍生的双功能 Ca-Fe-Mg 材料，用于通过化学循环策略集成 CO2 捕获和利用
DOI：
10.1016/j.cej.2021.133826
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发表时间：
2021
影响因子：
15.1
通讯作者：
Zhiwu Liang
中科院分区：
文献类型：
--
作者：
Yunlei Zhao;Youyou Li;Bo Jin;Zhiwu Liang
作为一种强有力的过程强化策略，化学循环在实现CO2捕集与利用的一体化以减少CO2排放和能源成本惩罚方面显示出广阔的前景。本文以层状双氢氧化物（LDH）为原料，合成了一种Ca-Fe-Mg双功能材料，并将其应用于化学链重整工艺中，实现CO2的捕集与利用。进行反应性测试和详细的表征技术，以检查和解释该材料的性能。900 °C被确定为合适的重整温度，因为获得更多的合成气产量（800 °C下的2.5倍）。Ca的存在诱导Ca和Fe之间的协同相互作用，以实现合成气含量和稳定的H2/CO比的增强的性能。Ca 2Fe 2 O 5向MgFe 2 O 4的相变、晶粒尺寸变化和颗粒团聚是导致材料活性失活的主要原因。与参比共沉淀材料相比，LDH衍生的Ca-Fe-Mg材料显示出增强的合成气产量，这是由于其高度分散的CO2吸附和重整活性位点。该工作为合理设计CO2捕集利用双功能材料提供了新的思路。
As a powerful process intensification strategy, chemical looping shows a promising future to achieve an integrated CO2capture and utilization for reducing CO2emissions and energy-cost penalties. Herein, a bifunctional Ca-Fe-Mg material derived from layered double hydroxide (LDH) was synthesized and used in chemical looping reforming process for integrated CO2capture and utilization. Reactivity tests and detailed characterization techniques are performed to examine and explain the performance of this material. 900 °C is determined as a suitable reforming temperature, since more syngas production is obtained (2.5 times of at 800 °C). The presence of Ca induces a synergetic interaction between Ca and Fe to implement an enhanced performance of syngas contents and stable H2/CO ratio. The activity deactivation of the material derives from the phase transition of Ca2Fe2O5to MgFe2O4, crystal size variation and particle agglomeration. Compared to a reference coprecipitated material, LDH derived Ca-Fe-Mg material shows an enhanced syngas production, due to its highly dispersion of CO2sorption and reforming active sites. This work provides a new route to rationally design bifunctional material for integrated CO2capture and utilization.