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Effect of method of preparation on activity of Pd/Al 2 O 3 monolith catalysts
Author(s) -
Mogalicherla Aswani Kumar,
Kunzru Deepak
Publication year - 2010
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.20288
Subject(s) - slurry , catalysis , materials science , monolith , dispersion (optics) , styrene , palladium , scanning electron microscope , chemical engineering , metal , composite material , metallurgy , chemistry , copolymer , organic chemistry , physics , polymer , optics , engineering
Pd/Al 2 O 3 monolithic catalyst of different washcoat thicknesses were prepared by two methods and tested for the activity of hydrogenation of α‐methyl styrene. These catalysts were prepared by two methods; either the palladium was impregnated on γ‐alumina and this Pd/Al 2 O 3 powder was used to prepare the slurry for washcoating (Cat 1) or γ‐alumina washcoating was followed by impregnation of palladium (Cat 2). The effect of slurry concentration, pH of the slurry, and addition of binders on the catalyst properties was investigated. The monolithic catalysts were characterised by determination of metal dispersion, surface area, scanning electron microscopy, and weight loss of washcoat during ultrasonication. Well‐adhered washcoats were obtained with slurry prepared using milled γ‐alumina, whereas the adhesion of the washcoat prepared using Pd/Al 2 O 3 powders was very poor. Addition of binders significantly improved the adhesion of the washcoats prepared from Pd/Al 2 O 3 . Metal dispersion for Cat 2 decreased with washcoat loading but did not change with loading for Cat 1. The activity tests were conducted at different washcoat loadings and the productivity of the monolithic catalyst prepared in both methods has been compared.