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A series of Co- and Ni-containing ZSM-5 zeolites with varying metal loading was prepared by solid-state ion exchange and by wet impregnation. Solid-state ion exchange led to highly dispersed metal ions inside the channels of ZSM-5. For the impregnated samples metal oxide clusters, mainly located on the exterior of the crystallites, were observed. Reduction at 573 K of NiZSM-5 prepared by solid-state...
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