文献类型：期刊文献

英文题名：Synthesis of CaO-based sorbents through incorporation of alumina/aluminate and their CO2 capture performance

作者：Zhou, Zhiming[1]; Qi, Yang[1]; Xie, Miaomiao[1]; Cheng, Zhenmin[1]; Yuan, Weikang[1]

机构：[1] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

年份：2012

卷号：74

起止页码：172

外文期刊名：Chemical Engineering Science

收录：EI(收录号：20121514938739)

语种：英文

外文关键词：Aluminum oxide - Scanning electron microscopy - Carbon dioxide - Differential scanning calorimetry - Sorption - Steam reforming - Alumina - Thermogravimetric analysis - Pore size - Sintering - Sorbents

摘要：CaO-based CO2 sorbents derived from various calcium and aluminum precursors were prepared by a wet mixing method and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and N2 adsorption-desorption techniques. The as-prepared sorbents consisted of active CaO and inert support materials that could be Al2O3, Ca12Al14O33 or Ca9Al6O18, depending on calcium and aluminum precursors used during the preparation process. A formation mechanism for the inert support materials was proposed. Compared to pure CaO, most of the synthetic CaO-based sorbents showed much higher CO2 capture capability and stability over multiple carbonation/calcination cycles, which was ascribed to the relatively high specific surface area of the sorbents, the bimodal pore-size distribution with a fair number of small pores, and the inert support material that can effectively prevent or delay sintering of CaO particles. Among these synthetic sorbents the CaO-Ca9Al6O18 sorbent with a CaO content of 80wt% (weight fraction) derived from calcium citrate and aluminum nitrate exhibited the best performance for CO2 capture, and can be expected to be applied in the sorption-enhanced steam methane reforming process. ? 2012 Elsevier Ltd.