期刊
APPLIED CATALYSIS A-GENERAL
卷 451, 期 -, 页码 144-152出版社
ELSEVIER
DOI: 10.1016/j.apcata.2012.10.040
关键词
Palladium; Biphasic hydrogenation; Catalyst; Klebsiella oxytoca; Polysaccharide
A palladium species bound to an exopolysaccharide (Pd-EPS) was obtained from alive bacterial cells of Klebsiella oxytoca BAS-10 grown in static mode in the presence of Pd(NO3)(2). Pd-EPS, after isolation and purification, was used as catalyst in the aqueous biphasic hydrogenation either of unfunctionalyzed olefins, as styrene, 1-octene and 1,3-diisopropenylbenzene, or of some alpha,beta-unsaturated aldehydes. The catalytic system was very active under mild reaction conditions and its activity was maintained in some recycle experiments. Even more efficient was the activated Pd-EPS, obtained by a pre-treatment of Pd-EPS with 1 MPa of H-2 at 30 degrees C for 21 h; while Pd-EPS originally contains only Pd(II), as demonstrated by XPS measurements, the activated catalyst shows the presence of both Pd(II) and Pd(O) in the ratio 1.9/1. The two catalytic systems show different structures at TEM observations evidencing the transformation of electron ultradense nanoaggregates (Pd-EPS) into jagged microaggregates (activated Pd-EPS). (C) 2012 Elsevier B.V. All rights reserved.
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