负载型MnOx/Al2O3催化剂低温下脱除烟气中单质汞特性

针对燃煤烟气中单质汞（Hg0）因不溶于水很难去除的问题,以浸渍法制备的负载型MnOx/Al2 O3为催化剂,在固定床实验台架上,考察前驱体、负载量、煅烧温度、反应温度和烟气成分对Hg0的催化氧化影响;采用N2吸附/脱附、扫描电镜（SEM）和X射线衍射（XRD）对催化剂进行表征.结果表明,硝酸锰浸渍催化剂的脱汞效率优于醋酸锰浸渍催化剂,催化剂的主要活性成分为MnO2;MnOx的表面形貌和存在形态是硝酸锰浸渍催化剂脱汞性能优于醋酸锰浸渍催化剂的主要原因.较低负载量下,前驱体对脱汞效率的影响较大;随着负载量的增加,其差异逐渐缩小.MnOx/Al2O3催化剂的最佳反应温度和煅烧温度分别为150℃和40...

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Published in煤炭学报 Vol. 38; no. 2; pp. 471 - 477
Main Author 张安超 郑雯雯 孙志君 胡松 朱建安 向军
Format Journal Article
LanguageChinese
Published 2013
Subjects
Al2O3
MnOx
低温
催化氧化
前驱体
单质汞
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ISSN0253-9993

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Summary:针对燃煤烟气中单质汞（Hg0）因不溶于水很难去除的问题,以浸渍法制备的负载型MnOx/Al2 O3为催化剂,在固定床实验台架上,考察前驱体、负载量、煅烧温度、反应温度和烟气成分对Hg0的催化氧化影响;采用N2吸附/脱附、扫描电镜（SEM）和X射线衍射（XRD）对催化剂进行表征.结果表明,硝酸锰浸渍催化剂的脱汞效率优于醋酸锰浸渍催化剂,催化剂的主要活性成分为MnO2;MnOx的表面形貌和存在形态是硝酸锰浸渍催化剂脱汞性能优于醋酸锰浸渍催化剂的主要原因.较低负载量下,前驱体对脱汞效率的影响较大;随着负载量的增加,其差异逐渐缩小.MnOx/Al2O3催化剂的最佳反应温度和煅烧温度分别为150℃和400℃.烟气中的O2能够补充催化剂消耗的晶格氧,促进Hg0的催化氧化;NO,SO2和H2O均对脱汞产生抑制作用,其中SO2的抑制作用最大,H2O次之,NO最小.
Bibliography:ZHANG An-chao, ZHENG Wen-wen , SUN Zhi-jun, HU Song, ZHU Jian-an , XIANG Jun （ 1. School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, China ; 2. State Key Laboratory of Coal Combustion, Hua- zhong University of Science and Technology, Wuhan 430074, China）
11-2190/TD
MnOx/Al2O3;catalytic oxidation;elemental mercury;precursor;low temperature
Abstract：Aiming at the difficulty of Hg0 removal from flue gas with its indissolubility in water, a series of studies on the characteristics of elemental mercury （ Hg~ ） catalytic oxidation removal from simulated flue gas were carried out with a laboratory-scale fixed-bed reactor using the MnOx/Al2O3 catalysts prepared by the wet impregnation method. The effects of precursor,MnOx content,calcination temperature,reaction temperature and flue gas compositions on the removal of Hg0 were also investigated. The characteristics of the catalysts were analyzed using the method of nitrogen adsorption/desorption, scanning electron microscope （SEM）,
ISSN:0253-9993