Why does reducing the pressure in the reforming reaction cause rapid catalyst deactivation?
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The main reaction in reforming is dehydrogenation, and low pressure facilitates the occurrence of this main reaction. It can increase the reforming conversion rate, suppress side reactions such as cracking reactions, and improve the liquid yield. However, reducing the reaction pressure will intensify the carbon deposition reaction and accelerate the loss of catalyst activity; is the pressure referred to here mainly the hydrogen partial pressure? As hydrogen decreases and pressure drops, dehydrogenation becomes easier; the amount of coking on the catalyst increases, and hydrocracking decreases!
At high temperatures and low hydrogen-to-oil ratios, the rate of catalyst carbon deposition increases, thereby accelerating catalyst deactivation; however, low pressures facilitate the aromatization reaction and can improve the aromatic conversion rate to a certain extent. For continuous reforming units, catalyst activity can be restored through catalyst regeneration by carbon burning.
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