NESTEC catalytic oxidizers use both precious and base metal catalysts, depending upon the application. For systems using a base metal catalyst coated onto a ceramic bead substrate, our design utilizes a tray arrangement with a gas hourly space velocity of around 14,000 h-1. The catalyst bed is designed into a recuperative oxidizer located between the inlet pass outlet of the heat exchanger and the combustion chamber. For systems that require a precious metal catalyst, NESTEC uses a coated ceramic monolith as provided by SŰD Chemie-Clariant.
This system can be cleaned periodically by removing the beads and tumble-cleaning them before returning them to the system. A small amount of make-up catalyst is typically required after cleaning. During system inspections, NESTEC will coordinate the testing of the catalyst for activity.