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An effective way of reducing or eliminating undesired diffusion limitations on the reaction rate is to reduce the crystal sizes of the zeolites [7–9]. Meanwhile, reducing the crystal size to the nanoscale produces substantial changes in the physicochemical properties of the zeolite. Nano-sized zeolite beta crystals were reported to exhibit higher catalytic activity, a lower rate of catalyst deactivation, and higher product quality than conventional (micro-sized) microcrystalline beta material [8,10–16]. Camblor et al. [10] revealed that the catalyst containing the nanocrystalline zeolite beta (particle size 10 nm) was more active in mild hydrocracking,HDS, and hydrodenitrogenation (HDN) than that containing larger crystals (200 nm), despite the latter zeolite having more Brønsted acid sites. They attributed the results to the higher mesoporosity of the nanocrystalline sample and a greater number of external acid sites that are easily accessible by the large molecules present in the gas oil feed. |
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