ELEMENTAL ANALYSIS 2012 IVA - IVA-Analysentechnik

This quartz degradation is accelerated by alkaline impurities present in the
catalyst. Even very low amounts of these impurities reduce the live-time of the tube
drastically. This adverse reaction was not detected during the analytical runs of the
new product.
The good quality of the catalyst was evaluated with a large number of
analyses. The chrome oxide region of the quartz tube was carefully observed and
compared to the degradation and the internal thickness of the silicate deposits with
different catalysts present on the consumable market.
The tests were performed on the New Chrome Oxide after analyses of
acetanilide samples. After 40, 150 and 250 runs the quartz tube was removed from
the furnace. Visual aspects and glass porosity were observed and documented. In
the following figures photos of the same quartz tube, after 40, 150 and 250 tests, are
reported.
Fig. 2: Quartz tube with new Cr2O3 after 40 runs
Fig. 3: Quartz tube with new Cr2O3 after 150 runs