Catalytic Teflon AF-2400 membrane reactor with adsorbed ex situ synthesized Pd-based nanoparticles for nitrobenzene hydrogenation
نویسندگان
چکیده
Among the unconventional approaches of supporting catalyst nanoparticles, layer-by-layer assembly polyelectrolyte multilayers for nanoparticle adsorption represents an easy and convenient method. It enables deposition singularly adsorbed nanoparticles prevents them from aggregating. In this work, polydopamine was grafted onto internal surface a Teflon AF-2400 tubular membrane, known its excellent permeability to light gases inertness chemicals. Poly(acrylic acid) poly(allylamine hydrochloride) were sequentially modified membrane. Ex situ synthesized spherical, cubical, truncated octahedral palladium or dendritic platinum-palladium then incorporated. The catalytic membranes assembled in tube-in-tube configuration tested over 6 h continuous nitrobenzene hydrogenation with molecular hydrogen. Stable conversion observed while progressive deactivation occurred other nanoparticles. Due their small size, 3.7 nm spherical exhibited highest reaction rate, 629molreactant/(molcatalyst⋅h), cubical showed turnover frequency, ∼3000 h−1. reactor concept developed work demonstrates how such design can serve as platform conducting multiphase reactions flow using finely tuned volume pressurized gas present offers improved process safety compared batch process, membrane provides control permeation during reaction.
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ژورنال
عنوان ژورنال: Catalysis Today
سال: 2021
ISSN: ['0920-5861', '1873-4308']
DOI: https://doi.org/10.1016/j.cattod.2020.03.062