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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >A Laboratory Test Setup for in Situ Measurements of the Dielectric Properties of Catalyst Powder Samples under Reaction Conditions by Microwave Cavity Perturbation: Set up and Initial Tests
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A Laboratory Test Setup for in Situ Measurements of the Dielectric Properties of Catalyst Powder Samples under Reaction Conditions by Microwave Cavity Perturbation: Set up and Initial Tests

机译：通过微波腔扰动在反应条件下原位测量催化剂粉末样品介电性能的实验室测试装置：设置和初始测试

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The catalytic behavior of zeolite catalysts for the ammonia-based selective catalytic reduction (SCR) of nitrogen oxides (NOX) depends strongly on the type of zeolite material. An essential precondition for SCR is a previous ammonia gas adsorption that occurs on acidic sites of the zeolite. In order to understand and develop SCR active materials, it is crucial to know the amount of sorbed ammonia under reaction conditions. To support classical temperature-programmed desorption (TPD) experiments, a correlation of the dielectric properties with the catalytic properties and the ammonia sorption under reaction conditions appears promising. In this work, a laboratory test setup, which enables direct measurements of the dielectric properties of catalytic powder samples under a defined gas atmosphere and temperature by microwave cavity perturbation, has been developed. Based on previous investigations and computational simulations, a resonator cavity and a heating system were designed, installed and characterized. The resonator cavity is designed to operate in its TM010 mode at 1.2 GHz. The first measurement of the ammonia loading of an H-ZSM-5 zeolite confirmed the operating performance of the test setup at constant temperatures of up to 300 °C. It showed how both real and imaginary parts of the relative complex permittivity are strongly correlated with the mass of stored ammonia.
机译：沸石催化剂对氮氧化物（NOX）的基于氨的选择性催化还原（SCR）的催化性能在很大程度上取决于沸石材料的类型。 SCR的必要先决条件是先前的氨气吸附发生在沸石的酸性位置。为了理解和开发SCR活性物质，了解反应条件下氨的吸附量至关重要。为了支持经典的程序升温脱附（TPD）实验，在反应条件下介电性能与催化性能和氨吸附的相关性似乎很有希望。在这项工作中，已经开发了一种实验室测试装置，该装置能够通过微波腔扰动在规定的气体气氛和温度下直接测量催化粉末样品的介电性能。基于先前的研究和计算仿真，设计，安装和表征了谐振腔和加热系统。谐振腔设计为在1.2 GHz的TM010模式下工作。 H-ZSM-5沸石的氨负荷的首次测量证实了该测试装置在最高300°C的恒定温度下的运行性能。它显示了相对复介电常数的实部和虚部如何与所存储氨的质量紧密相关。

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