Deactivation of Polymer-Supported Palladium Catalystsin the Hydrogenation of 4-Nitrotoluene

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Title:Deactivation of Polymer-Supported Palladium Catalystsin the Hydrogenation of 4-Nitrotoluene
Creators:
Fišera, Roman
Králik, Milan
Annus, Julius
Krátky, Vieroslav
Zecca, Marco
Hronec, Milan
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 62, 11, pp. 1763-1775
Uncontrolled Keywords:4-Nitrotoluene, Polymer-supported palladium catalysts, Hydrogenation, Catalyst deactivation, Ion-exchange polymers

Abstract

The deactivation of palladium catalysts supported on commercially available sulfonated polystyrene-divinylbenzene resins (DOWEX) in the hydrogenation of 4-nitrotoluene was studied. Catalysts were prepared from 4 and 8 mole % crosslinked polymers, with particle size between 0.04 and 0.80 mm and palladium contents ranging from 0.25 to 1 wt.% (dry state). The catalytic tests were carried out in a batch reactor vigorously shaken, at 30-50 °C, and 0.25 and 0.5 MPa. The analysis of the conversion curves showed that three factors are mainly responsible for the relatively high deactivation rates: (i) the concentration of hydrogen in the neighbourhood of palladium crystallites, (ii) temperature, (iii) the nanomorphology of the support. Some practical advice concerning the employment of polymeric hydrogenation catalysts and relevant operational conditions can be achieved from the results presented herein.

Title:Deactivation of Polymer-Supported Palladium Catalystsin the Hydrogenation of 4-Nitrotoluene
Creators:
Fišera, Roman
Králik, Milan
Annus, Julius
Krátky, Vieroslav
Zecca, Marco
Hronec, Milan
Uncontrolled Keywords:4-Nitrotoluene, Polymer-supported palladium catalysts, Hydrogenation, Catalyst deactivation, Ion-exchange polymers
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:62
Number:11
Page Range:pp. 1763-1775
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19971763UNSPECIFIED
ID Code:1251
Item Type:Article
Deposited On:06 Feb 2009 17:07
Last Modified:06 Feb 2009 16:08

Citation

Fišera, Roman; Králik, Milan; Annus, Julius; Krátky, Vieroslav; Zecca, Marco; Hronec, Milan (1997) Deactivation of Polymer-Supported Palladium Catalystsin the Hydrogenation of 4-Nitrotoluene. Collection of Czechoslovak Chemical Communications, 62 (11). pp. 1763-1775. ISSN 0010-0765

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