Method of treating a catalytic reactor system prior to reactor servicing

A method comprising:

• operating a process using a catalytic reactor system comprising a catalyst, whereby the process produces at least one hazardous substance;
• discontinuing operation of the process;
• abating the at least one hazardous substance from the catalytic reactor system such that a fouling rate of the catalyst is substantially the same before and after the abating;
• and
• restarting operation of the process using the catalyst.

A method comprising:

• oxidizing a catalytic reactor system at a temperature of from about 350° F. to about 500° F.;
• monitoring abatement of at least one hazardous substance within the catalytic reactor system;
• and
• controlling the oxidation in response to the monitoring such that an activity of a catalyst contained therein as measured by T-eq after the oxidizing is within about 20° F. of the catalyst activity before the oxidizing and the at least one hazardous substance is oxidized to a safe exposure level.