文献类型：期刊文献

英文题名：CO2 Capture Performance of CaO-Based Sorbents Prepared by a Sol-Gel Method

作者：Xu, Pan[1];Xie, Miaomiao[1];Cheng, Zhenmin[1];Zhou, Zhiming[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2013

卷号：52

期号：34

起止页码：12161

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20133716722345);WOS:【SCI-EXPANDED(收录号:WOS:000323876000038)】；

基金：Financial support from the National Natural Science Foundation of China (No. 21276076) and the Fundamental Research Funds for the Central Universities (222201313011) are greatly acknowledged.

语种：英文

外文关键词：Fossil fuels - Scanning electron microscopy - Sorption - Hydrogen production - Sol-gel process - Steam reforming - Calcium - Sol-gels - X ray diffraction - Aluminum compounds - Sintering - Carbon dioxide

摘要：The CaO-based sorbents are considered to be promising candidates for capturing CO2 from postcombustion of fossil fuels, and how to improve the sintering-resistant performance of the sorbents at high temperature is a challenge for researchers. In this paper, a series of CaO-based sorbents, which consisted of active CaO and inert Ca9Al6O18 acting as the support matrix, was synthesized by a sol-gel method with various calcium precursors. The structural properties of the resulting sorbents were characterized by N-2 physisorption, X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), and energy dispersive spectrometry (EDS) techniques, showing that the sorbents prepared by the sol-gel method possessed small grains, interconnected pore network as well as uniform distribution of CaO and Ca9Al6O18. These features gave rise to enhanced CO2 capture performance of the synthetic sorbents compared to pure CaO. In particular, the sorbent with a CaO content of 90 wt % (weight fraction) derived from calcium lactate displayed the best performance for CO2 capture during a long-term cyclic operation, whose CO2 capture capacity remained as high as 0.59 gco(2)/g(sorbent) at the 35th carbonation-calcination cycle. Finally, this sorbent was applied to the sorption-enhanced steam methane reforming process for hydrogen production, and all the conversion or concentration profiles obtained in 10 consecutive reforming-regeneration cycles almost overlapped, further demonstrating the excellent performance of the sol-gel-derived CaO-based sorbent.