Influence of salt impregnation on the initiation of thermo-chromatographic pulses by dielectric heating.
Selective dielectric heating using the influence of a coupling medium such as water can lead to the formation of combined temperature-mass transport pulses moving through a packed bed. Depending on the dielectric and sorption properties of the material, these so-called thermo-chromatographic pulses (TCP) can cause large temperature differences between the starting temperature and the peak temperature in the pulse. The impregnation of porous substances with various salts was shown to be a simple method for improving material properties leading to the formation of stable TCP. This procedure was proven to only slightly reduce the specific surface area and the sorption capacity towards organic compounds of the investigated sorbents. Consequently, a wide spectrum of silica gels, zeolites and porous alumina can be applied as matrices for TCP-based processes in chemical engineering and environmental technology.
Roland
Ulf
U
Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Technology, Permoserstr. 15, 04318 Leipzig, Germany. ulf.roland@ufz.de
Kraus
Markus
M
Trommler
Ulf
U
Kopinke
Frank-Dieter
FD