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atalysts 2015, 5 219 1. Application in Reactant-Selective or Product-Selective Reactions (Non-Catalytic Membranes) 6.1. Application in Reactant-Selective or Product-Selective Reactions (Non-Catalytic Membranes) Nishiyama et al. [249] coated a silicalite-1 membrane on spherical Pt/TiO2 particles applying Nishiyama et al. [249] coated a silicalite-1 membrane on spherical Pt/TiO2 ydrothermal synthesis and obtained core-shell catalysts displaying reactant selectivity due to th particles applying a hydrothermal synthesis and obtained core-shell catalysts sorption-based permselective properties of the zeolite membrane. The authors impregnated th displaying reactant selectivity due to the adsorption-based permselective properties eforehand proefptahrezdePolti/tTe imOe2mwbirtahnea. sTohleuatiuotnhorfs 0im.4prwegt.n%atecdathioenbiecfoproehlyaentdhpyrlepnaeriemdiPnte/TiniOo2rder to charg with a solution of 0.4 wt. % cationic polyethyleneimine in order to charge its surface s surface positively and thus facilitate the adsorption of the silicalite-1 seeds by subsequent immersing i positively and thus facilitate the adsorption of the silicalite-1 seeds by subsequent 0 wt. % silicalite-1 seed solution. The final membrane zeolite coating crystallization was performed i immersing in 1.0 wt. % silicalite-1 seed solution. The final membrane zeolite coating closed vessel at 180 °C for 24 h. Figure 10 depicts the SEM images revealing the dense uniforml crystallization was performed in a closed vessel at 180 ◦C for 24 h. Figure 10 depicts the SEM images revealing the dense uniformly formed silicalite-1 shell rmed silicalite-1 shell with a thickness of approximately 40 μm on the surface of the co t/TiO2 spheres. withathicknessofapproximately40μmonthesurfaceofthecorePt/TiO spheres. 2 Figure 10. SEM images of Pt/TiO2 particles coated with silicalite-1. Reprinted with Figure 10. SEM images of Pt/TiO2 particles coated with silicalite-1. Reprinted with permission from [249]. Copyright (2004) American Chemical Society. permission from [249]. Copyright (2004) American Chemical Society. The thereby prepared silicate-1 membrane layer permeated preferentially The thereby prepared silicate-1 membrane layer permeated preferentially the reactant 1-hexene fro the reactant 1-hexene from a mixture comprising 1-hexene and dibranched mixture com3,3p-rdisiminegth1y-lhbeuxt-e1n-eneandtowdiabrrdasncthed P3t,/3T-diOimetchaytallbyust-1l-eandeintgowtaordismtphreovPetd/TiO2 cataly 2 ading to improved hydrogenation selectivities for 1-hexene. At a reaction temperature of 323 K th hydrogenation selectivities for 1-hexene. At a reaction temperature of 323 K the ratio of hydrogenation selectivities for the linear/branched alkene mixture was between tio of hydrogenation selectivities for the linear/branched alkene mixture was between 12 and 20. 3 K the selectivity range was increased to 18–30 revealing the positive impact of the selective permeatio 45 1-hexene across the silicalite-1 membrane towards the Pt/TiO2 particles in principle and th mperature influence in addition. By applying a hydrothermal synthesis including two crystallizatio eps, the same working group prepared thinner silicite-1 membranes with improved quality. In that cas C . d . or m s e aA 7 f e te he authors adopted first a short crystallization step under rotation in order to increase the number densitPDF Image | Zeolite Catalysis
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