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Received July 9, 2003
Accepted October 6, 2003
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The Effect of HCl and H2O on the H2S Removing Capacities of Zn-Ti-based Desulfurization Sorbents Promoted by Cobalt and Nickel Oxide
Department of Chemical Engineering, Kyungpook National University, Daegu 702-701, Korea 1School of Chemical Engineering and Technology, Yeungnam University, Kyongsan 712-749, Korea
kjchang@knu.ac.kr
Korean Journal of Chemical Engineering, March 2004, 21(2), 425-429(5), 10.1007/BF02705431
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Abstract
The sulfur removing capacities of various Zn-Ti-based sorbents were investigated in the presence of H2O and HCl at high-(sulfidation, 650 ℃; regeneration, 800 ℃) and medium-(sulfidation, 480 ℃; regeneration, 580 ℃) temperature conditions. The H2O effect of all sorbents was not observed at high-temperature conditions. At mediumtemperature conditions, the reaction rate of ZT (Zn/Ti : 1.5) sorbent decreased with the level of H2O concentration, while modified (ZTC, ZTN) sorbents were not affected by the water vapor. HCl vapor resulted in the deactivation of ZT sorbent with a cycle number at high-temperature due to the production of ZnCl2 while the sulfur removing capacities of ZTC and ZTN sorbents were maintained during 4-5 cyclic tests. In the case of medium-temperature conditions, ZT sorbent was poisoned by HCl vapor while cobalt and nickel added to ZT sorbent played an important catalytic role to prevent from being poisoned by HCl due to providing heat, emitted when these additives quickly react with H2S even at medium-temperature conditions, to the sorbents.
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Jun HK, Lee TJ, Ryu SO, Kim JC, Ind. Eng. Chem. Res., 40(16), 3547 (2001)
Kang SC, Jun HK, Lee TJ, Ryu SO, Kim JC, HWAHAK KONGHAK, 40(3), 289 (2002)
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Woudstra T, Woudstra N, J. Inst. Energy, 68(476), 157 (1995)
Yi CK, Jo SH, Lee BH, Lee SY, Son JE, Jin GT, Korean J. Chem. Eng., 18(6), 1005 (2001)
