Reaction Between 1-Hexene and Hydrogen and Deuterium on Copper-Chromium Oxide Catalyst
Reaction of hydrogen and deuterium with 1-hexene was investigated in a vapor phase, flow reactor on copper-chromium oxide catalyst at temperatures of from 50 to 150 deg . The catalyst was pre-treated with hydrogen at 325 deg , There are three primary reactions, hydrogenation, isomerization to trans- and cis- 2-hexene which appear in a ratio of about 10, and formation of isotopically exchanged 1-hexene. The last reaction is the fastest and, as shown by n.m.r., it involves almost exclusively exchange at carbon atom-2 to form 1-hexene-2-d. The activation energy for isomerization is about 5 kcal greater than that for hydrogenation. The rates of the two reactions are equal at about 90 deg . At 60 deg , presence of 1-hexene almost completely inhibits hydrogenation of 2-hexene but it does not inhibit isomerization of 2- to 3-hexene. The isotopic distribution pattern of the hexene formed at low conversions seems to result from the addition of two (H,D) atoms to a mixture of 1-hexene and 1-hexene-2-d formed by previous exchange. Thus, during the course of hydrogenation, there seems to be little tendency for reversion of diadsorbed hexane to monoadsorbed. Isotopic distribution patterns for trans-2-hexene are presented and difficulties in the application of the Horiuti- Polanyi mechanism to olefin isomerization and exchange are discussed.
- Research Organization:
- Northwestern Univ., Evanston, Ill.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-028929
- OSTI ID:
- 4694606
- Journal Information:
- Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 3 Vol. 67; ISSN 0022-3654
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
Similar Records
Reactions between Deuterium and Olefins in the Liquid Phase on Platinum Oxide Catalysts
REACTIONS BETWEEN HYDROCARBONS AND DEUTERIUM ON CHROMIUM OXIDE GEL. I. GENERAL