Home > German catalyst producer invests in Mettler Toledo’s new G20 compact titrators

German catalyst producer invests in Mettler Toledo’s new G20 compact titrators

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A catalyst producer based in Germany has purchased three G20 compact titrators from Mettler Toledo after successfully beta testing a unit by analysing industrial catalysts. Key benefits for the catalyst manufacturer included intuitive user interface, ease of use and storage of up to five different user methods.

Based in Redwitz, Germany, Johnson Matthey Catalysts GmbH supplies catalysts for pollutant emission control. These catalysts help reduce dangerous NOx emissions, one of the major pollutants emitted by industries such as power plants, incineration plants, stationary diesel engines and heavy duty diesel vehicles.

Johnson Matthey Catalysts primarily manufactures two different types of catalyst, an extruded honeycomb-shape catalyst and a plate catalyst, both operating according to the same principle of the so-called Selective Catalytic Reduction (SCR) technology, which chemically reduces NOx to harmless nitrogen and water by incorporating a reduction agent such as ammonia.

Johnson Matthey's technical research laboratory requires the catalyst testing to be reliable when analysing the efficiency and residual activity of newly developed and used catalysts in order to avoid high production failures and operating costs.

The catalytic activity in per cent turnover is first determined by measuring the residual ammonia after catalytic reduction during a test run. The exhaust gas is collected and converted into a liquid.

After distillation, the ammonia content is measured by a simple acid/base titration using a Mettler Toledo DP5 Phototrode to measure the colour change of the indicator. Since the ratio between NOx and ammonia is 1:1, the activity of the catalyst is inversely proportional to the ammonia concentration.

A second test measures catalyst side reaction wherein the sulphur dioxide is collected from the exhaust gas through a condenser, and oxidised and determined as sulphuric acid with a simple endpoint titration using sodium hydroxide. The result gives the oxidation percentage to indicate side reaction efficiency.

Johnson Matthey Catalysts beta-tested Mettler Toledo’s new G20 compact titrator in May 2009 with Achim Hösch, a lab technician in their research laboratory appreciating the performance of the equipment.

The operators used the instrument to perform extensive sample testing and titration methods. An intuitive and simple user interface with easy storage of up to five user methods allows the user to create dedicated methods for varying sample sizes.

Mr Hösch picked out the ‘Short Cuts’ and ‘One Click’ features as beneficial for their daily routine in addition to the connected compact USB printer's small footprint.

Following the successful beta-test, Johnson Matthey Catalysts purchased three titrators for its technical research laboratory. 

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