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AssigneeExxonMobil Chemical Patents Inc.
InventorsTodd E. Detjen, Robert G. Tinger, Gary D. Mohr, David B. Looney
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A method of reducing the amount of carbon monoxide present during the metal reduction step of start-up, thus, maintaining metal dispersion and improving the metal reduction and catalyst yields. Carbon monoxide formation is minimized during the start-up procedure and during the initial catalyst dryout phase in a hydrogen-containing atmosphere, gas is purged from the reactor system, either continuously at constant pressure or by a series of pressure/depressure cycles, to remove carbon monoxide. The purging is conducted at temperatures of about 30-500° C. and pressures of about −90-5,000 kPa(g) (−0.9-50 bar(g)). In this temperature range, carbon monoxide absorbed to the surface of the metal will desorb into the hydrogen-containing atmosphere and can be removed from the system along with carbon monoxide present in the atmosphere through the purging.
A method of desorbing carbon monoxide from metal-impregnated catalysts, the method comprising purging gas from the catalyst reactor system at about 30-500° C. and about −90 kPa(g)-5,000 kPa(g) while the catalyst is in the presence of hydrogen by performing at least two pressure/depressure cycles, wherein said metal comprises platinum in an amount less than about 0.05 wt %, and wherein said purging reduces the carbon monoxide concentration in the catalyst reactor system to about 1 ppm or less.
A method of reducing carbon monoxide concentration in a catalyst reactor system comprising a metal-impregnated catalyst, said process comprising:
Dependencies are inferred from the claim text.