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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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| 有效的减少或消除影响反应速率的非理想扩散限制的一种方法是减小沸石的晶体粒度。同时，将晶体粒度减小到纳米尺寸会使沸石的物理化学性质产生本质的变化。曾经报道过纳米尺寸沸石β晶体展现出更高的催化活性，较低的催化剂失活率以及比传统（微米级）微晶β材料具有更高的产品质量。Camblor等报道到尽管包含更大晶体的（200nm）沸石β具有更多的Brønsted 酸位点，但是纳米晶体的（粒度为10nm）沸石β比包含更大晶体的（200nm）沸石β在温和加氢裂解，HDS，和水化脱氮（HDN）方面具有更高的活性。他们将结果归功于纳米晶体样本具有更高的中孔隙和更多的外部酸位点使汽油燃料中的大分子更容易进入。 |
4楼2010-08-27 16:02:22
5楼2010-08-27 16:05:11