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Research of Catalytic Performance and Anti-poison Characteristics Over CuSO4-V2O5/TiO2-SiO2 in Catalytic Removal of NOx

Author: LiShaoAn
Tutor: HuangZuo；TongZhiQuan
School: Xiangtan University
Course: Environmental Engineering
Keywords: Copper sulfate Vanadium pentoxide TiO2-SiO2 NH3 - SCR Catalytic oxidation
CLC: X701
Type: Master's thesis
Year: 2011
Downloads: 88
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Abstract


NH 3 -SCR method is the most widely used method of denitration in the industry today, the SCR catalyst normally takes about 350 ℃ high temperature environment, the SCR reactor is usually installed in the boiler economizer and air preheater, but the catalyst by pollution. In China, most of the boiler economizer, air preheater and boiler three are installed into a whole, it is difficult to NH 3 -SCR process with foreign direct match. The SCR reactor design in the precipitator (ESP) would be ideal, however, here the flue gas temperature is only 150 2 50 ℃, much lower than the current required by the SCR catalyst temperature above 350 ℃ environment, low temperature SCR DeNOx catalyst has become a research focus. The catalytic oxidation denitration (CO) method is an application of the promising denitration method. In industrial flue gas, more than 90% of the NO x is NO, the NO is difficult to absorb water and lye, if NO is oxidized into NO 2 , then can achieve the NO x the efficient absorption. Studies have shown that, the NO x oxidation degree of 50% to 60%, and then desulfurization absorption liquid absorption, will be able to achieve simultaneous desulfurization and denitrification. This study examined the CuSO 4 -V 2 O 5 / TS catalyst for the SCR catalytic activity. And CuSO 4 -V 2 O 5 / TS and V are 2 O 5 / TS SCR activity compared to study Add the CuSO 4 of the SCR catalyst performance. 2 O on the CuSO 4 -V 5 / TS catalyst for the low temperature NH 3 -SCR activity of the preparation parameters and operation conditions of its anti-H 2 O and SO -2 poisoning ability to study. Experimental results show that the best preparation parameters obtained the CuSO 4 -V 2 the O 5 / TS catalyst at a reaction temperature of 220 ℃, the imports of NO concentration of 1000 × 10 -6 (phi), the NH 3 / NO 1.1, space velocity of 5000 h -1 and O24 % (phi) conditions, the catalyst of the denitration rate of up to 99.1%, NO is almost completely restored into N2. The catalyst also has good low temperature resistant to water and sulfur alone. The catalyst for the anti-sulfur water experiments, the experiment up to 30 h, the catalyst denitrification rate has been in a high efficiency of more than 86%. Stop to join H 2 O and SO 2 after the activity of the catalyst within 10 h from 86.4% to 90.1%. Compared with catalyst V 2 O 5 / TS, the CuSO 4 the join enhanced the CuSO 4 - V 2 O 5 / TS catalyst activity at low temperature and anti-drug performance. CuSO 4 -V 2 O 5 / TS catalyst-oxidation was investigated preparation parameters and operating conditions on the oxidation activity impact and its anti-drug performance. The experiments show that: When the NO inlet concentration for the 500 × 10-6 (?), An oxygen content of 8% (?) Airspeed 5000 h -1 and the reaction temperature is 300 ° C conditions, CuSO 4 -V 2 O 5 / TS oxidation activity reached 57.1%, no SO, the without of H 2 O < sub> 2 conditions comply with the requirements of high efficiency wet absorption degree of oxidation. Reaction temperature of 300 ° C, H 2 O and NO competitive adsorption, oxidation of the catalyst activity decreased, cut off the H 2 O, the oxidation activity can be basically restored; SO 2 NO 2 the lead chamber reaction and the composition of the catalyst (such as of TiO 2 ) sulfate phenomenon, so the catalyst toxic effects, cut SO 2 after oxidation of the catalyst performance recovery to a lesser extent; H 2 O and SO -2 simultaneously the oxidation activity of the catalyst recovery, the competitive adsorption, the lead chamber reaction and the catalyst component is sulfuric acid and other factors, catalyst poisoning was cut the H 2 O and SO -2 very small. Oxidation of the The catalyst can be used without SO 2 the Gas boiler flue gas and nitric acid exhaust industrial NO x exhaust gas denitration process.

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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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