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Received October 20, 2009
Accepted December 24, 2009
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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A study of the sulfidation and regeneration reaction cycles of Zn-Ti-based sorbents with different crystal structures
Department of Chemical Engineering, Pohang University of Science and Technology, Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784, Korea 1Department of Chemical Engineering, Kyungpook National University, Daegu 702-701, Korea 2GS Fuel Cell Co., 453-2, Seongnae-dong, Gangdong-gu, Seoul 134-848, Korea
kjchang@knu.ac.kr
Korean Journal of Chemical Engineering, September 2010, 27(5), 1428-1434(7), 10.1007/s11814-010-0237-0
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Abstract
The reaction cycles of the sulfidation and regeneration of Zn-Ti-based sorbents prepared by a physical mixing method (ZT-700 and ZT-1000) or co-precipitation method (ZT-cp) were tested in a fixed bed micro-reactor at middle temperature (Sulfidation; 480 ℃, regeneration; 580 ℃). The ZnS produced during sulfidation from the Zn2TiO4 with a spinel structure (ZT-1000, ZT-cp) was easily regenerated even at 550 ℃, while the ZnS produced from the ZnO with a hexagonal structure (ZT-700) needed a temperature higher than 610 ℃. After regeneration, each sorbent was restored to its original crystal structure. The differences in the regeneration properties and the reaction cycles of the sorbents were related to the original crystal structures rather than to the physical properties such as pore volume and surface area. To study these differences further, FT-IR, FT-Raman, XRD and TPR were used, and their results including the reaction cycles of the sulfidation and regeneration on the Zn-Ti based sorbents with different crystal structures were_x000D_
discussed.
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