Oxidation of ammonia to NO_x in a two bed reactor (Pt gauzes + oxide monolytic layer): Experimental studies and mathematical modelling

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• 作者：N.V. Vernikovskaya ; L.G. Pinaeva ; L.A. Isupova
• 关键词：Two-bed reactor ; Pt gauzes ; Oxide honeycomb monolith ; Ammonia oxidation ; Mathematical modelling
• 刊名：Chemical Engineering Journal
• 出版年：15 February, 2014
• 年：2014
• 卷：238
• 期：Complete
• 页码：140-147
• 全文大小：506 K

文摘

The behavior of one- and two-bed systems consisting of Pt-Rh gauze pack (the first bed) and monolith honeycomb catalyst (the second bed) in the conditions corresponding to those in the industrial medium pressure plant for NH₃ oxidation to NO_x was experimentally studied. At complete NH₃ conversion in the gauze pack installation of the monolith results in the increase of the temperature in the gauzes and NO_x yield. One dimensional mathematical model with heat and mass exchange between gas and solid phases and considering the effect of monolith as a heat shield was developed. The effect of monolith was supposed to consist preferentially in increasing the coefficients of heat and mass exchange between gas and solid phases in the gauze pack and determined by 鈥渉ydrodynamic factor鈥?纬 depending on monolith geometry. It results in the shift of temperature front towards the frontal gauze and the reasonable increase of NO_x yield.