Study on thermal decomposition and denitration performance of polyacrylamide
Three different types of polyacrylamides were selected as polymer denitration agents,and the pyrolysis process of PAM was analyzed by thermogravimetric analysis(TG)and temperature-programmed mass spectrometry(TP-MS).And the denitration performance of polymer denitration agents was also eval-uated at high-temperature.The results showed that the final weight loss rate of three kinds of polyacrylam-ide was:CPAM＞NPAM＞APAM.Through TP-MS detection,it was found that all three types of polyacryl-amides undergo terminal amide group decomposition to produce ammonia gas during the temperature rise decomposition process,firstly,and then the main chain was broken.The apparent activation energy of am-monia generated by thermal decomposition of three types of polyacrylamides are CPAM 169.72 kJ/mol,APAM 246.58 kJ/mol and NPAM 210.18 kJ/mol,respectively.The denitrification performance of three types of polyacrylamides is NPAM＞CPAM＞APAM.The denitrification activity is related to the rate and amount of ammonia produced by PAM decomposition.NPAM with slower ammonia production rate and higher ammonia production exhibits higher denitrification activity,while APAM with lower ammonia pro-duction has poorer activity.Excellent polymer denitration agents require good thermal stability and a grea-ter amount of ammonia decomposition.
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