Improvement of the Activity and Selectivity of Low-loaded Pt Catalysts

CAROLINA BETTI; JUAN M. BADANO; MARÍA JULIANA MACCARRONE; CARLOS R. VERA; MÓNICA E. QUIROGA

Beijing

Simposio; World Resources Forum 2012 (WRF 2012); 2012

Institute of Process Engineering, Chinese Academy of Sciences, China

In recent works our group has studied the effect of the precursor salt and the temperature ofreduction on the activity and poison resistance of monometallic catalysts for the selectivehydrogenation of styrene. The objective of this work is to extend this research to the reactionsystem of the bimetallic Pt-Ni/g-alumina catalyst and the model feedstock of styrene contaminatedwith thiophene. The influence of the preparation of bimetallic PtNi catalysts on their activity andsulfur resistance during styrene semi-hydrogenation was studied.All catalysts showed high selectivities to ethylbenzene (>98%).The bimetallic catalysts were more active thanmonometallic Pt and the following activity order was found: Pt≈ NiClPt< NiNPt< PtNiCl< PtNiN.After poisoning with 300 ppm of thiophene the following order of sulfur resistance wasfound: PtNiCl < Pt < PtNiN ≈ NiClPt≈ NiNPt