US EPA

7629993 

Journal Article 

SELECTIVE HYDROGENATION OF PYRENE AND FLUORANTHENE USING VARIOUS NOBLE-METAL CATALYSTS 

Mochida, I; Ohira, M; Sakanishi, K; Fujitsu, H; , 

1986 

1 

Nippon Kagaku Kaishi
ISSN: 0369-4577
EISSN: 2185-0925 

CHEMICAL SOC JAPAN 

TOKYO 

1986 

8 

1112-1116 

English 

10.1246/nikkashi.1986.1112 

WOS:A1986D706300013 

Selective hydrogenation of pyrene and fluoranthene to the corresponding partially hydrogenated derivatives was studied using noble metals on carbon under 30~70 atm of hydrogen. Pd/C catalyst was most selective to produce dihydro- [2] and tetrahydropyrene [5] with the best yields of 48% and 84% at 200°C and 150°C for Ih and 16 h, respectively. The decreasing yield of [2] with the prolonged reaction time was due to its successive hydrogenation. Higher reaction temperature of 300°C and use of Rh/C catalyst were favorable for the production of hexahydropyrene [3]. Because of the favorable production of [2] and [5] at lower temperatures, rapid heating to the reaction temperature was suggested to be effective to obtain an increased yield of [3]. Hydrogenation of fluoranthene was more rapid and selective: the reaction using Pd/C catalyst at 100°C for 0.5 h at 20 atm provided tetrahydrofluoranthene in 77% selectivity at 100% conversion. Based on the product analyses in the course of the reactions, competitive and successive nature of pyrene hydrogenation were suggested Hydrogenative isomerization of [5] to [3] was ascertained to occur in the reaction with [5]. © 1986, The Chemical Society of Japan. All rights reserved.