一种新的机械混合法制备Ag(Ⅰ)@β吸附剂及其吸附CO性能

Ag(Ⅰ)@β prepared by a novel mechanical mixing method and its CO adsorption ability

CO是卷烟主流烟气中的主要有害物质之一,长期接触低浓度CO可造成慢性中毒。本文提出一种新的机械混合法制备吸附CO的Ag(Ⅰ)@β吸附剂,采用N_2吸附法和X射线衍射分别表征了Ag(Ⅰ)@β吸附剂的孔隙结构和晶体结构;采用固定床吸附技术模拟吸烟过程,研究其吸附CO性能,并考察了制备条件对其性能的影响。结果表明:使用新的机械混合法制备负载AgNO_3的吸附剂,可避免银盐的分解,制得高分散性的负载型AgNO_3吸附剂,其对CO的吸附性能优于传统正己烷混合法得到的。Ag(Ⅰ)@β吸附剂的焙烧时间对其性能有影响,AgNO_3负载量较高时,所需要的最佳焙烧时间也较长;当Ag NO_3和β分子筛质量比为0.10g/g时,其对CO吸附容量达到最佳值,是原始β分子筛的4.76倍,其抗水蒸气吸附性能也得到提高。

A series of Ag（Ⅰ）@β adsorbents were prepared by a novel mechanical mixing method for CO adsorption.Textural properties and crystalline structures of the Ag（Ⅰ）@β adsorbents were characterized by N2 adsorption test and X-ray diffraction.CO adsorption performance of Ag（Ⅰ）@β was examined by fixed bed experiments.Effects of preparation conditions on its CO adsorption performance were discussed.Results showed that（1） Applying the mechanical mixing method to prepare Ag（Ⅰ）@β can avoid decomposition of AgNO3 to Ag0to get well-dispersion of AgNO3 over β zeolite,and thus CO adsorption capacity of the prepared Ag（Ⅰ）@β adsorbents were much higher than that of Ag（Ⅰ）@β synthesized by traditional impregnation of silver chloride-cyclohexane solution;（2） Calcination time for preparing adsorbents had impact on CO adsorption performance of the adsorbents.Ag（Ⅰ）@β with higher loading of AgNO3 had longer optimal calcination time so that the Ag（Ⅰ）@β with optimal CO adsorption performance can be obtained;（3） At weight ratio 0.1 g/g of AgNO3to β zeolite,CO adsorption capacity of Ag（Ⅰ）@β reached maximum of 12.52 mg/g,4.76 times that of original β zeolite.Its water vapor resistance became better than the original β zeolite.