Platinum Metals Rev., 1970, 14, (3), 86
New Platforming Catalysts
Commercial Experience Confirms Improved Stability and High Yields
By more sophisticated preparative techniques and by adjustments to chemical composition and to physical properties, successive versions of the platinum on alumina catalysts developed and produced by Universal Oil Products over the past twenty years have steadily shown improved performance in their Platforming process. Research during the more recent years has given prominence, however, to the incorporation of a second metal into the platinum catalyst, and in 1968 a new catalyst, designated R-16, was announced, providing exceptionally good stability characteristics, especially at high operating severities and low operating pressures. This new member of the range introduces rhenium into the catalyst. This has a synergistic effect on the performance of the platinum, leading to improved yields of both high octane gasoline and aromatics as well as larger quantities and greater uniformity of hydrogen produced as a by-product.
While pilot plant studies and a limited amount of commercial operation with the new rhenium-platinum catalyst showed its marked superiority over its predecessors, a paper presented by E. A. Sutton, of UOP, to the American Petroleum Institute during its meeting in Houston in May, reports on two years of commercial experience in a number of units that fully confirm the small-scale experience and demonstrate its significance in improved performance.
New Platforming units have been designed and put into operation to take advantage of the improved stability characteristics of the rhenium-platinum catalyst to maximise yields of reformate, aromatics and hydrogen, while existing units have employed it in many ways to improve profitability. The benefits in the latter category have included:
Increased operating severity, with high reformate octane and higher yields of aromatics.
Improved yield of both reformate and aromatics by reduction in operating pressure.
Less frequent regeneration.
Reduced catalyst investment.
The commercial units described in the paper represent only a few of the many available examples of existing Platforming units that have utilised the improved catalyst to increase the profitability of operation. Some 32 existing units with a combined capacity of 250,000 BPSD are currently using the rhenium-platinum catalyst, these including both motor fuel and aromatics producing units with feedstocks ranging from highly paraffinic Arabian and Kuwait naphthas to high cyclic content California naphthas. In addition, five newly designed Platforming units have started operation with the new catalyst, while a further 20 units have been designed to take more complete advantage of its great stability.
Closely following the development of the R-16 rhenium-platinum catalyst is a more recent advance in Platforming technology. The latest addition to the range is another binary platinum catalyst designated as R-20. Pilot plant data show that R-20 has stability characteristics similar to the R-16 types but also has a significant selectivity advantage in terms of Platformate and aromatics yields.
Both these new catalysts will have a place in the refiner’s armoury. The newest addition, R-20, has been in successful commercial use for the past several months, but in units not specifically designed to take full advantage of its outstanding characteristics, particularly the low operating pressures, which favour the greatest yields of very high octane Platformate or of aromatics.