Synthesis and characterization of silver hollandite and its application in emission control
Synthesis and characterization of silver hollandite and its application in emission control
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DOI：
10.1021/cm0506508
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发表时间：
2005-08-23
影响因子：
8.6
通讯作者：
King, DL
中科院分区：
文献类型：
--
作者：
Li, LY;King, DL
在AgNO3熔体中，用锰钾矿离子交换法合成了银锰锰矿Ag1.8Mn8O16。与先前描述的合成工艺相比，AgMnO 4在970摄氏度下在5千巴氧气下热分解7天，这种新开发的合成工艺很容易进行，能够合成大量用于评估、测试和放大。与以前可用的材料相比，通过这种新方法制备的银硬硅钙石具有小得多的晶体尺寸，因此具有高得多的表面积。研究了银锰矾在烟气治理中的应用。该材料是一种优异的低温SO2吸收剂，也是一种高活性的CO和NO氧化催化剂。银锰氧化物保持其催化氧化活性，即使它是同时老化的SO2吸附。
Silver hollandite, Ag1.8Mn8O16, has been synthesized by ion exchange of cryptomelane in AgNO3 melt. Compared to the previously described synthesis process, thermal decomposition of AgMnO4 at 970 degrees C under 5 kbar oxygen for 7 days, this newly developed synthesis process is easily carried out, enabling synthesis of significant quantities for evaluation, testing, and scale-up. Silver hollandite prepared by this new method has much smaller crystal size and thus much higher surface area compared with the previously available material. Application of silver hollandite for emission control has been examined. This material is an excellent low-temperature SO2 absorbent as well as a highly active catalyst for CO and NO oxidation. Silver hollandite maintains its catalytic oxidation activity even while it is simultaneously aging by adsorption Of SO2.