Pd nanoparticles (2 nm) stabilized in the micelle core of poly(ethylene oxide)-block-poly(2-vinylpyridine) were studied in partial hydrogenation of 2-butyne-1,4-diol. Both unsupported micelles (0.6 kg Pd/m3) and supported ones on g-Al2O3 (0.042% Pd) showed nearly 100% selectivity to 2-butene-1,4-diol, with up to 94% conversion. The only side product obsd. was butane-1,4-diol. The catalysis was ascribed to the surface of Pd nanoparticles modified by pyridine units of micelles and alkali reaction medium (pH of 13.4). The TOF [turnover frequency] over unsupported and supported catalysts was 0.56 and 0.91 s-1 (at 323 K, 0.6 MPa H2 pressure, solvent 2-propanol/water = 7:3), resp. Reaction kinetics fit the Langmuir-Hinshelwood model assuming weak hydrogen adsorption. Expts. on catalyst reuse showed that Pd nanoparticles remain inside the micelle core, but the micelles desorbed by less then 5% during the catalytic run. [on SciFinder (R)]
Titre
Palladium nanoparticles stabilized in block-copolymer micelles for highly selective 2-butyne-1,4-diol partial hydrogenation
Publié dans
Applied Catalysis A: General
Volume
280
Numéro
2
Pages
141-147
Date
2005
ISSN
0926-860X
Note
CAN 142:375524
45-4
Industrial Organic Chemicals, Leather, Fats, and Waxes
Laboratory of Chemical Reaction Engineering, LGRC-EPFL,Swiss Federal Institute of Technology,Lausanne,Switz.
Journal
written in English.
110-63-4P (1,4-Butanediol) Role: BYP (Byproduct), PREP (Preparation) (activity and stability of Pd nanoparticles stabilized in block-copolymer micelles in selective partial hydrogenation of 2-butyne-1,4-diol); 110-64-5P (2-Butene-1,4-diol) Role: IMF (Industrial manufacture), PREP (Preparation) (activity and stability of Pd nanoparticles stabilized in block-copolymer micelles in selective partial hydrogenation of 2-butyne-1,4-diol); 110-65-6 (2-Butyne-1,4-diol); 10025-98-6 (Potassium chloropalladate (K2PdCl4) Role: RCT (Reactant), RACT (Reactant or reagent) (activity and stability of Pd nanoparticles stabilized in block-copolymer micelles in selective partial hydrogenation of 2-butyne-1,4-diol); 143969-90-8 (Ethylene oxide-2-vinylpyridine block copolymer) Role: CAT (Catalyst use), USES (Uses) (micelles, catalyst carrier; activity and stability of Pd nanoparticles stabilized in block-copolymer micelles in selective partial hydrogenation of 2-butyne-1,4-diol); 7440-05-3P (Palladium) Role: CAT (Catalyst use), SPN (Synthetic preparation), PREP (Preparation), USES (Uses) (nanoparticles; activity and stability of Pd nanoparticles stabilized in block-copolymer micelles in selective partial hydrogenation of 2-butyne-1,4-diol); 16940-66-2 (Sodium borohydride (NaBH4) Role: RGT (Reagent), RACT (Reactant or reagent) (reducing agent; activity and stability of Pd nanoparticles stabilized in block-copolymer micelles in selective partial hydrogenation of 2-butyne-1,4-diol); 1344-28-1 (Alumina) Role: CAT (Catalyst use), USES (Uses) (support; activity and stability of Pd nanoparticles stabilized in block-copolymer micelles in selective partial hydrogenation of 2-butyne-1,4-diol)
Date de création de la notice
2006-04-18
