Estimation of Effective Diffusivity of Stored NOx in the Barium Phase of Pt/BaO/Al2O3 Catalysts using TAP

被引：7
作者：
Kumar, Ashok [1 ]
Harold, Michael P. [1 ]
Balakotaiah, Vemuri [1 ]
机构：
[1] Univ Houston, Dept Chem & Biomol Engn, Houston, TX 77204 USA
来源：
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2010年 / 49卷 / 21期
关键词：
TRAP CATALYSTS; STORAGE; REDUCTION; H-2; REGENERATION; MONOLITH; PT/AL2O3; PT/BA/AL2O3; DISPERSION; RESOLUTION;
D O I：
10.1021/ie100504q
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
A systematic study over Pt/BaO/Al2O3 powder catalyst is carried out using Temporal Analysis of Products (TAP) to estimate the effective diffusivity of stored NOx in the barium phase. The prenitration of Pt/BaO/Al2O3 using sequential pulses of NO, followed by reduction with H-2 results in the evolution of N-2 and NH3. The reduction is carried out in the NOx transport limited regime in which diffusion of the stored NOx from BaO storage phase to Pt/BaO interface was determined to be the rate controlling process. The effluent profiles of N containing species (2N(2) + NH3) were used to estimate stored NOx diffusivity in barium phase and the apparent activation energy. The activation energy (74-81 kJ/mol) is in good agreement with the estimated value of 75 kJ/mol from a recent NOx trap modeling study.(1)
引用
收藏
页码：10334 / 10340
页数：7
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