The problem of catalyst deactivation?
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It is well known that catalysts need to be passivated at the start of operation in order to suppress their activity; then why not design systems with less catalyst used?
A decrease in the total inventory, along with insufficient residence time for catalysts at various stages, can lead to many negative effects, such as a deterioration in coking efficiency and a decline in stripping efficiency
Passivation is carried out to prevent excessive initial activity of the catalyst from leading to runaway reactions or damage to the catalyst; only after passivation does the catalyst’s activity and service life come closer to the values specified in the design. The amount of catalyst to be used is determined based on various factors such as the feed rate, properties of the raw materials, product requirements, temperature and pressure, and space velocity. Reducing the amount of catalyst used will inevitably result in a decrease in processing capacity, reduced catalyst lifespan due to high space velocities, and issues such as substandard product quality
After eating a large amount of meat, one usually needs to eat some vegetables and drink some water; so why can’t they eat less meat?
The amount of catalyst is determined based on the processing capacity of the entire system and the characteristics of the process technology. Reducing the catalyst load to address minor issues such as passivation would result in a loss of economic efficiency for the system.