Journal
APPLIED CATALYSIS A-GENERAL
Volume 605, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2020.117815
Keywords
Bifunctional catalysts; Zeolites; Chlorinated alumina; Infrared spectroscopy; Alkane hydro-isomerization; Pt-precursor effects
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Funding
- European Research Council
- EU FP7 ERC Advanced Grant [338846]
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In previous studies H2PtCl6 center dot 6H(2)O or Pt(NH3)(4)(NO3)(2) were used to control the location of Pt nanoparticles in Zeolite/gamma-Al2O3 composites for the synthesis of metal-acid bifunctional catalysts. Use of H2PtCl6 center dot 6H(2)O led to Pt nanoparticles located on the gamma-Al2O3 binder, in a 'nanoscale' intimacy with zeolite acid sites being beneficial for performance in the conversion of hydrocarbons, compared to catalysts with Pt nanoparticles located in zeolite Y ('closest' metal-acid intimacy) obtained by use of Pt(NH3)(4)(NO3)(2). A side effect of using H2PtCl6 center dot 6H(2)O was a higher NH3 uptake in NH3-TPD experiments, that suggested a higher acidity possibly affecting catalysis. In this study the effect of residual chlorine on Pt/Zeolite Yty-Al2O3 catalysts (0.1-0.6 wt.% Cl) was investigated by (pyridine) FTIR, NH3 -TPD and n-alkane hydro-isomerization. The coordination of chlorine to gamma-Al2O3 was observed and led to a higher NH3 uptake, but no effect of chlorine on the catalytic performance of the catalysts was detected.
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