A multistep procedure for the preparation of palladium-containing zeolite beta spheres using anion-exchange resin beads as shape-directing macrotemplates is presented. In a first step, resin beads are hydrothermally treated with zeolite beta synthesis solutions, and as a result resin−zeolite beta composite particles are obtained. In a second step, anionic palladium precursor species are introduced into the composite using the residual ion-exchange capacity of the resin. Finally, the ion exchanger is removed by calcination, leaving self-bonded palladium-containing zeolite beta spheres. The spheres obtained by the procedure were characterized by AAS, XRD, SEM, EDS, UV−vis DRS spectroscopy, nitrogen adsorption measurements, and chemisorption. Materials with controlled macroshape, porosity, and palladium content were prepared by the method.
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Naydenov et al. (2002) studied this question.
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