Calcium Looping Technology Using Improved Stabilit

Authors: Cong Luo Ying Zheng Ning Ding Chuguang Zheng

Publish Date: 2011/7/17

Volume: , Issue: , Pages: 1171-1176

PDF Link

Abstract

One of the postcombustion CO2 capture technologies that have sufficiently been proved to be the best candidates for practical large scale postcombustion application is the calcium looping cycle However the CO2 capture capacity of a calciumbased sorbent derived from natural limestone decays through longterm cyclic utilization thus the development of novel sorbents to achieve a high CO2 capture capacity is an critical challenge for the calcium looping cycle technology In this paper we report the preparation and character of a new calciumbased sorbent produced via the combustion of a dry gel The results show that the novel calciumbased sorbent has a much higher residual carbonation conversion as well as a better performance of antisintering when compared with the calciumbased sorbent derived from commercial micrometer grade CaCO3 and nanometer grade CaCO3 It is reasonable to propose that the different final carbonation performances are induced by their different pore structures and BET surface areas rather than by different particle sizes Compared with the commercial nano CaO the morphology of the new sorbent shows a more rough porous appearance with hollow nanostructure During carbonation CO2 diffused more easily through the hollow structure than through a solid structure to reach the unreacted CaO Besides there is less chance for the hollow nanostructured particles to be merged together during the high temperature reactionsThe authors acknowledge the financial supports of National Basic Research Program of China No2011CB707301 and the National Natural Science Foundation of China No50936001 51021065 The authors are also grateful to Analytical and Testing Center of Huazhong University of Science and Technology for FSEM measurements

Keywords: