A professional who tends catalytic converters that alter chemical composition of liquid or gaseous substances as directed by catalytic-converter operator. Respnsibilities include:

• Moves controls to set material feed, temperature, and pressure regulators at specified values.
• Monitors operation of pumps and auxiliary equipment, such as heat exchangers and absorbers, and moves controls to maintain operating equilibrium in auxiliaries as directed.
• Assists other workers in changing catalyst in reactor units.
• Turns valves to purge converters and sets thermostat on catalyst regenerators to rejuvenate spent catalyst.
• Records instrument readings in operating log.
• May be designated according to product produced as butadiene-converter helper; ethylbenzene-converter helper; ethylene-plant helper; or according to chemical reaction effected as dehydrogenation-converter helper.