Removal of elemental mercury from simulated flue gas by cerium oxide modified attapulgite

摘要

A novel catalyst CeO_2/ATP was developed to remove Hg~0 from coal fired gas. This is new way to use the facile, cheap and larger BET specific surface area catalyst attapulgite (ATP) as support to remove Hg~0 from coal fired gas. The Hg~0 removal and oxidation efficiency of CeO_2/ATP (1 : 1) is up to 97.75% and 92.23% at 200℃, respectively. We also found that ATP plays an important role in improving the catalyst activity of CeO_2/ATP, which can make CeO_2/ ATP have more stable catalyst activity at broader temperature range and obtain lower optimum activity temperature. Other influencing factors, such as temperature and flue gas environment (SO_2, Cl_2, NO), are also investigated in order to get a clear understanding of the experiment. The formation mechanisms are also proposed.