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Gas-phase dehydrocyclization of diphenylamine

Paper ID Volume ID Publish Year Pages File Format Full-Text
43547 45976 2007 6 PDF Available
Title
Gas-phase dehydrocyclization of diphenylamine
Abstract

The gas-phase dehydrocyclization of diphenylamine to carbazole was studied in a fix-bed reactor over Pt and Pd catalysts. Alumina, magnesium oxide and silica were used as supports. The reaction was carried out at a temperature of 560 °C in the presence of hydrogen. Pd catalysts are reasonably active but not selective compared to Pt catalysts which possess very high activity and selectivity. For supporting active metal, proper alumina has advantages compared to silica and magnesium oxide. This is due to its acid sites which accelerate the isomerization step. Though higher loading of Pt has a positive influence on the carbazole formation, at a Pt content higher than 0.6 wt.% this effect is negligible. In the presence of catalyst with 0.6 wt.% Pt deposited on alumina, carbazole is produced with a selectivity of about 90% at a conversion of diphenylamine about 97%.

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Keywords
Diphenylamine; Carbazole; Dehydrocyclization; Platinum catalysts; Gas-phase
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 328, Issue 2, 10 September 2007, Pages 183–188
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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