Citation:
	            
		            LIU  Jie-Xiang, ZHANG  Xiao-Guang, DUAN  Zhong-Yu, LIU  Xiao-Li. NOx Molecule Adsorption in [Ag]-MAPO-5 (M=Si, Ti)Molecular Sieves[J]. Acta Physico-Chimica Sinica,
							;2010, 26(10): 2679-2685.
						
							doi:
								10.3866/PKU.WHXB20101013
						
					
				
					
				
	        
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NOx adsorption in silver-exchanged aluminophosphate molecular sieves ([Ag]-SAPO-5 and [Ag]-TAPO-5) was investigated using the density functional theory (DFT). Equilibrium structure parameters and adsorption energies were obtained and compared. The results indicated that the η1-N mode was more stable than the η1-O mode. The adsorption energy values of NOx followed the order: NO2>NO>N2O. Compared to the free gas state, the bond parameters of NO and NO2 in the adsorbed state changed more than that of N2O in [Ag]-SAPO-5 and [Ag]-TAPO-5. Moreover, [Ag]-SAPO-5 and [Ag]-TAPO-5 had a higher activation for the NOx molecule compared to [Ag]-AlMOR. The resistance capabilities of [Ag]-SAPO-5 and [Ag]-TAPO-5 to SO2,H2O, and O2 were also studied and analyzed. In addition, the interaction mechanism of NOx in silver-exchanged aluminophosphate molecular sieves was investigated using natural bond orbital (NBO) analysis.
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