Treatment of nitrogen oxides in air using modified ZSM-5 zeolite

Subject Areas : environmental management

Sayed Bagher Mortazavi ¹ (Assistant Professor, Department of Occupational Health, Faculty of Medical Sciences, Tarbiat Modares University.)
Rasoul Yarahmadi ² (Department of Occupational Health, Faculty of Medical Sciences, Tarbiat Modares University)
Mohmmadreza Omidkhah ³ (Assistant Professor, Department of Chemical Engineering, Faculty of Engineering, Tarbiat Modares University)
Hassan Asiliyan ⁴ (Associate Professor, Department of Occupational Health, Faculty of Medical Sciences, Tarbiat Modares, University)
Ali Khavanin ⁵ (Associate Professor, Department of Occupational Health, Faculty of Medical Sciences, Tarbiat Modares, University)
Parvin Moridi ⁶ (HSE Center Jahad Daneshgahi. Iran)

Received: 2007-12-26 Accepted : 2008-01-21 Published : 2009-09-23

Keywords: Nitrogen Oxides, Monolith, zirconium oxide, Conversion, impregnation,

Abstract :

In the present study, modification and interaction effects of synthetic zeolite on NOx conversion are investigated. ZSM-5, γ-Alumina, and Alumina Silicate are used as catalyst supports for catalytic media on honeycomb monolith. First, a physical mixture containing 200g of each zeolite per volume of honeycomb was prepared. Then, a physical mixture was prepared in two separate matrices with 1% of nanometal oxides of palladium and platinum and 3% zirconium and cerium oxides, and then wash coated using the impregnation technique NOx conversion experiment was carried out under the interactive effects of temperature and reducer gas (propane). For this purpose, four levels of experimental design were used. The results showed that among the three modified zeolites, the "ZSM-5" with Zro2 and Ceo2 had optimized conditions for NOx conversion (P =0.05). In addition, the optimized conditions for NOx conversion in C3H8/NOx were obtained in a temperature of 180° C and a mole ratio of 1.5 with NOx removal efficiency of 83 %.