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8702518 
Journal Article 
Chromium Oxide Gel Catalysts for Dehydro-cyclization of n-Heptane 
Turkevich, J; Fehrer, H; Taylor, HS 
1941 
Yes 
Journal of the American Chemical Society
ISSN: 0002-7863
EISSN: 1520-5126 
63 
4 
1129-1131 
English 
1. As alternatives to the preparation of chromium oxide gel by slow precipitation with dilute ammonia from dilute chromium nitrate solutions three methods of preparation have been studied: (a) the formation from a jelly, (b) precipitation as gel from chromic acetate, (c) reduction of chromic acid by alcohol and other organic reducing agents. 2. The activities of the four catalyst types have been examined as to dehydrogenation-cyclization activity toward normal heptane and as to the composition of the liquid product in olefins and aromatics. 3. Catalysts obtained by alcohol reduction of chromic acid possess high activities and are readily prepared in bulk. 4. Partial reduction of chromic acid with oxalic acid gives products of high aromatizing activity and readily prepared. 5. Reduction of chromic acid by sugar solutions gives only moderately active products. 6. The diminution in activity with time in the aromatization of heptane reduces the activity of the catalyst for dehydrogenation of cyclohexane. 1941, American Chemical Society. All rights reserved.