Method of reducing ignition temperature in exothermic catalytic reaction.

摘要

A method of reducing ignition temperature during exothermic catalytic reactions in gaseous reactants in a process gas being passed through a monolithic structured catalyst unit provided with a plurality of small hydraulic diameter channels (2) and a plurality of large hydraulic diameter channels (4), which method comprises passing a first portion (8) of the process gas through the small diameter channels (2) and a second portion (10) of the process gas through the large diameter channels (4), so that the first gas portion (8) flows at a low flow velocity and a high reaction rate in the unit and excess of heat evolving during the catalytic reactions proceeding at the high rate in the small diameter channels is transferred to the second portion (10) of the process gas to reduce the ignition temperature of the catalytic reactions proceeding in the large diameter channels (4).