The invention relates to a porous, fired ceramic foam having a total porosity of between 50 and 92 % and an intergranular porosity of at least 5 %.
The invention concerns a method which consists in selectively destroying nitrous oxide at high temperature on catalysts consisting of refractory oxide agglomerates (alumina or zirconium) having intergranular porosity impregnated with a zirconium salt.
It can also contribute to significant changes in the microstructure like grain growth and localized densification due to the elimination of intergranular porosity.
In particular the formation of intra-versus inter-granular porosity is dependent on the identity of the carboxylate substituents.
They generally comprise several layers, feature inter-granular porosity, and span a little more than half this country’s territory.
This standard describes the reference method used for type testing and in cases of dispute, the determination of the voids of dry compacted filler by means of a Rigden apparatus.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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