In addition, there are many other factors that will influence the properties and performance of the equilibrium catalyst. These include, but are not limited to: deposition of heavy metals such as Ni, V, Cu; deposition of light metals such as Na; contamination from attrited refractory linings of vessel
walls. Furthermore, commercially derived equilibrium catalyst represents a distribution of catalysts of different ages (from fresh to >300 days)

Мой перевод:
Кроме того, получаемый в промышленных масштабах равновесный катализатор представляет собой распространение катализаторов разного срока службы (от свежих до > 300 дней).

Не уверена, что age в данном случае - "срок службы", да и общий смысл хромает.

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