CHROMIA/ZEOLITE CATALYST FOR REMOVING NITROGEN OXIDE AND CHLORINATED ORGANIC COMPOUND OF WASTE GAS AND METHOD FOR REMOVING THEM USING THE CATALYST

摘要

PURPOSE: A catalyst for simultaneously removing nitrogen oxides and chlorinated organic compounds made by a process and method for removing them using the catalyst is provided which use a chromia/zeolite catalyst and ammonia or urea. CONSTITUTION: A method comprises pouring ammonia or urea as a reducing agent into waste gas containing nitrogen oxide or organic compound at 200 to 450°C and passing the waste gas through the chromia/zeolite catalyst. For increasing the rate of removal of nitrogen oxides, a zeolite support in an amount of about 3% based on the weight of the support is ion exchanged by copper ion and then chrome oxide in an amount of 1 to 20% by weight based on the total weight of the catalyst is supported on the copper ion exchanged zeolite support.