http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
NOx Storage-Reduction over Pt/Mg-Al-O Catalysts with Different Mg/Al Atomic Ratios
Guangwen Chen,Hao Cheng,Shudong Wang,Diyong Wu,Yin Zhang,Henqiang Li 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.3
A series of Pt/Mg-Al-O catalysts with different Mg/Al atomic ratios were prepared. The NOx storagecapacities of these catalysts were measured by isothermal storage at 350oC. It was found that the NOx storage capacityincreased with increasing Mg/Al atomic ratios. The catalytic behaviors of Pt/Mg-Al-O and Pt/MgO were studied withstorage-reduction cycles at 400oC. Under oxidizing conditions, NOx concentration in the outlet gas gradually increasedwith time, which indicated the catalysts could store NOx effectively. After a switch from oxidizing conditions toreducing conditions, NOx desorption peak emerged immediately due to the incomplete reduction of stored NOx, whichlowered the total NOx conversion. With increasing Mg/Al atomic ratio in the catalysts, NOx conversion increases. Pt/MgO has the highest NOx conversion because of its best activity in the reduction of NOx by C3H6. It seems that withan increasing amount of MgO in the catalysts, the self-poisoning of Pt-sites by adsorbed species during the reactionof NOx with C3H6 may be inhibited effectively.