Deactivation of copper-ion-exchanged hydrogen-mordenite-type zeolite catalyst by SO2 for no reduction by NH3

✍ Scribed by Sung-won Ham; Hoon Choi; In-Sik Nam; Young Gul Kim

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 632 KB
• Volume: 11
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/0920-5861(92)80045-o

✦ Synopsis

Deactivation of copper-ion-exchanged hydrogen-mordenite-type xeolite catalyst by SO* for NO reduction by NH, was examined in a fixed-bed flow reactor. ' The deactivation of the catalyst was strongly dependent on reaction temperature. At high reaction temperatures over 300 "c, the catalyst did not lose its initial activity up to 50 h of operation, regardless of SOsfeed concentration from 500 to 20,000 ppm. However, at low reaction temperatures near ZSO"C, apparent deactivation did occur. Changes in the physicochemical properties such as surface area and sulfur content of deactivated catalyst well correlated with catalyst activity, depending upon reaction temperatures. The deactivation was due to pore blocking and/or filling by deactivating agents, which plugged and/or filled the pores of catalyst. The deactivating agents deposited on the catalyst surface were presumed to be (NH&SO., and/or (NIIJHSO, from the results of TGA and ion-~~mato~phy measurement.