高校化学工程学报2017，Vol.31Issue(5)：1186-1192,7.DOI:10.3969/j.issn.1003-9015.2017.05.023
660 MW燃煤电厂商用SCR催化剂的失活与再生
Deactivation and Regeneration of Commercial SCR Catalysts Used in a 660 MW Coal-Fired Power Plant
摘要
Abstract
Used commercial SCR catalysts (30000 hours) obtained from a 660 MW coal-fired plant in Zhejiang Province (China) were examined by SEM, BET, NH3-TPD, XRF and XPS to investigate their deactivated and regeneration mechanisms. Fresh commercial SCR catalysts were chosen for comparison. The results indicate that depositions containing salts of alkali metals (K and Na) and compounds of arsenic and ammonium sulfate block pores of the catalyst, which decreases its BET surface. Moreover, the acidity of the SCR catalysts decreases due to the reaction of metal ions with activated acidic sites on the SCR catalyst surface. After catalyst regeneration with 0.5 mol.L-1 dilute sulphuric acid, the activity of denitration increases from 42.62% to 78.30% at 350℃. Regeneration by pickling can effectively remove alkali metals from the surface of the catalysts, which also has certain effects in the removal of arsenic and ammonium sulfate. In addition, the augment of acidity and the increase of chemical adsorption oxygen proportion were examined after pickling, which are found beneficial to increase activity of deactivated commercial SCR catalysts for denitration.关键词
燃煤电厂/选择催化还原/脱硝催化剂/失活机理/酸洗再生Key words
coal-fired plant/SCR/denitration catalysts/deactivation mechanism/pickling regeneration分类
化学化工引用本文复制引用
张沛,吴思明,方拓拓,陈艳萍,施耀,何奕..660 MW燃煤电厂商用SCR催化剂的失活与再生[J].高校化学工程学报,2017,31(5):1186-1192,7.基金项目
国家科技支撑计划(2014BAC22B06) （2014BAC22B06）
国家自然科学基金(21676245,21476191) （21676245,21476191）
国家重大研发计划(91434110). （91434110）
