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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

DOI zum Zitieren dieses Dokuments: https://doi.org/10.3390/s140916856

Title data

Dietrich, Markus ; Rauch, Dieter ; Porch, Adrian ; Moos, Ralf:
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.
In: Sensors. Vol. 14 (2014) Issue 9 . - pp. 16856-16868.
ISSN 1424-8220
DOI: https://doi.org/10.3390/s140916856

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Abstract

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.

Further data

Item Type: Article in a journal
Keywords: ammonia SCR; ammonia storage; H-ZSM-5; cavity perturbation; complex permittivity; in operando; radio frequency
DDC Subjects: 600 Technology, medicine, applied sciences
600 Technology, medicine, applied sciences > 620 Engineering
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Language: English
Originates at UBT: Yes
Date Deposited: 01 Dec 2015 10:05
Last Modified: 01 Dec 2015 10:05
URI: https://epub.uni-bayreuth.de/id/eprint/2099

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