Air cleaning apparatus, installations and components, also for vehicles, namely exhaust gas catalysts for mobile and stationary combustion engines, such as electric current generators, thermal systems, thermal coupling systems, for motor cars, lorries, locomotives, construction machines, tunnel building machines, lifting vehicles, sea-going vessels, boats for inland navigation and boats for river navigation, all combustion machines with Otto, diesel, gas, hot-air or steam engines as well as gas turbines and heating systems, such as heaters, garbage furnaces and special furnaces as well as installations for technical processes, particularly exhaust gas catalysts for NO reduction, for CO and/or HC oxidation; devices for the catalytic purification of exhaust gases, such as soot filters, inline burners, parts for inlet tubes for reactive agents, particularly for injection nozzles, mixers, particularly reverse current mixers, built-in catalysts, particularly reduction and oxidation catalysts