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Preparation of Plate V2O5/TiO2SCR Catalyst and Its Mechanical Strength

Author: WangXianPeng
Tutor: LiuQingYa
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: NO removal flue gas SCR catalyst plate-type preparation abrasion strength
CLC: X701
Type: Master's thesis
Year: 2012
Downloads: 213
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Abstract


Coal-fired boiler yields a large amount of SO2, NOxand dust, whichhas received much attention in the last decade due to their seriouspollution to environment and human being. SO2emission has beenefficiently controlled while NOxemission increases significantly in recentyears. The environmental protection in our country is facing a lot ofchallenges.NOxremoval by selective catalytic reduction (SCR) with NH3hasbeen widely used abroad in industry due to its efficiency and reliability.The catalyst for this process is mainly V2O5/TiO2-based one, which isshaped into monolithic structure, including honeycomb and plate types, toovercome dust plugging and pressure drop. The plate SCR catalyst ismore suitable for heavy-dust flue gas such as in our country due to itslarger channel.There is few literature about shaping of plate SCR catalyst exceptsome patents. Attrition strength, an important parameter for SCR catalyst,has also never been reported. Based on our earlier work on preparation ofplate V2O5/TiO2catalyst, an apparatus to evaluate attrition strength of aplate catalyst was designed and developed. This paper presents systematicstudies on effects of organic binder, moisture content in the pug, drying and calcining conditions on attrition strength and SCR activity of plateV2O5/TiO2catalyst. The results obtained will provide fundamentaltechnical parameters for preparation of plate catalyst with high strengthand SCR activity. The following conclusions can be drawn:1. PVA as the organic binder is obviously superior to HPMC. Thepug with PVA binder has a better plasticity and the corresponding platecatalyst shows stronger abrasion strength.2. Properties of the pug are sensitive to its moisture content. Withincreasing moisture content of the pug from43%to51%, volume ofmeso/macro pores in the catalyst increases and attrition strength becomesworse. Although BET surface area of the catalyst made from the pug with43%moisture content,97m2/g, is slightly larger than those of the othercatalysts,86-93m2/g, SCR activity is slightly lower and SO2oxidationactivity is higher.3. The dry process is an indispensable step during catalystpreparation and determines abrasion strength of the catalyst. Abrasionstrength change little with increasing heating rate from0.3℃/min to1℃/min during the drying process, but it decreases with furtherincreasing the heating rate.4. Calcining process shows a slighter effect on abrasion strength ofthe catalyst, in comparison to drying process. With increasing calciningtime, the abrasion strength improves. With increasing heating rating from 5℃/min to20oC/min, the abrasion strength of the catalyst decreases.5. With increasing calcining temperature from450oC to550oC,volume of meso/macro pores in the catalyst decreases and the abrasionstrength improves. With further increasing calcining temperature to650oC, abrasion strength change little but SCR activity significantlydecreases due to the obvious decrease in BET surface area and slightincrease in TiO2crystalline.6. To get a catalyst of a higher SCR activity and stronger abrasionstrength, the pug with46%moisture content (an optimal value) should bedried with a heating rate of1℃/min and calcined at550℃for2h with aheating rate of5℃/min. The resulting plate catalyst has a better originalstrength than the commercial catalysts. Its steady abrasion rate (0.5%/h)and SCR activity (about90%) are equal to those of Argillon and BHK. ItsSO2oxidation rate (1.0%) was lower than those of Argillon and BHK(above3.0%).

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization
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