Abstract
A bifunctional catalyst Pt/Hβ-n (Pt loading: 0.4 wt%) was prepared by the impregnation of an aqueous solution of chloroplatinic acid with β zeolite, wherein the β zeolite support has an unusual morphology of egg-like microspheres assembled by nanocrystallites. Other two control catalysts were also prepared using a β support with micro-sized crystals and a commercial one with varying crystal sizes. The catalysts were characterized by XRD, SEM, ICP, N2 sorption isotherms and mesopore size distribution, and evaluated in the hydroisomerization of n-heptane in an atmospheric fixed bed flow reactor. Though Pt/Hβ-n has similar acidity and Pt loading (0.4 wt%) to the two control catalysts, it exhibits remarkably higher conversion of n-heptane and selectivity to isomerization. According to the characterization data, the higher activity of Pt/Hβ-n is the result of the faster diffusion of reactants in shorter channels of nanocrystallines and the uniformly distributed mesopores within the microspheres.
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The authors thank greatly the national Natural Science Foundation of China (NSFC Nos. 21136005, 21101094 and 20976084).
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Yao, Y., Wang, J., Deng, Y. et al. Morphological effect of β zeolite nanocrystallite aggregates as the support of Pt catalyst for the hydroisomerization of n-heptane. Reac Kinet Mech Cat 107, 167–177 (2012). https://doi.org/10.1007/s11144-012-0454-0
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DOI: https://doi.org/10.1007/s11144-012-0454-0