Abstract
Within this study, monolithic three-dimensional silica aerogel (SA) composite parts with super insulating properties are presented. A generic part based on fiber-reinforced (FR) silica aerogel for thermal insulation of the exhaust tubing system—to keep the exhaust gases as hot as possible to improve the efficiency of the catalyst system—was produced via a sol-gel-based molding process in combination with a supercritical drying using scCO2. A thermal conductivity of 16 mW m−1 K−1 was measured via a heat flow meter technique. In this manuscript, we present a full cycle of the material compound design, starting with fundamental material evaluation including aerogel optimization, opacifier influence, and casting process. The obtained generic part in shape of a half-shell for pipe insulation is characterized under real conditions.
Highlights
The emission rate of exhaust gases has become a relevant subject of discussion, and it has led to measures of strict control
The porosity was calculated from the ratio of the bulk density and skeletal density which were determined by means of measurements with GeoPyc and AccuPyc
We successfully prepared FRSA composites filled with various ceramic opacifiers
Summary
The emission rate of exhaust gases has become a relevant subject of discussion, and it has led to measures of strict control. Diesel engines are still considered for stationary, semi-stationary, and mobile applications. Selective catalytic reduction (SCR) is applied for the reduction of NOx emissions. This catalytic system is located downstream of the exhaust system. With better insulation of the exhaust line, higher temperatures are achieved at the catalyst. Aerogels have emerged as areas of focus among several research groups [3]. Given their nanostructured porosity, aerogels are perfectly suited for thermal insulation applications. There are a variety of publications concerning the fundamental approaches to synthesizing and characterizing silica aerogels [3,4,5,6,7,10,11]
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