INFLUENCE OF OXYGEN IN THE GAS-PHASE HYDROGENATION OF 2-ETHYL-HEXENAL

被引:11
作者
SCHRODER, U
ANDERSSON, B
机构
[1] Department of Chemical Reaction Engineering, Chalmers University of Technology
关键词
D O I
10.1016/0021-9517(91)90157-Y
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The influence of oxygen in the feed on the very fast deactivation of a Pt/AI2O3 catalyst during gas-phase hydrogenation of the unsaturated aldehyde, 2-ethyl-hexenal, was investigated (50-160°C, P = 1 atm). The addition of oxygen (<0.5%) prevented deactivation and the products obtained were saturated aldehyde, saturated alcohol, deoxygenated aldehyde, and in a side reaction CO2 and heptane. In the absence of oxygen, the simultaneous H2D2 exchange reaction was inhibited, and the products were saturated aldehyde, saturated alcohol, and in a side reaction CO and heptane. A tested Rh/Al2O3 catalyst was deactivated quickly like Pt/Al2O3 and the addition of oxygen restored the activity, while the tested Pd/Al2O3 and Ru/Al2O3 catalysts were not found to deactivate quickly and the addition of oxygen did not increase the activity. The fast deactivation on Pt/Al2O3 and Rh/Al2O3 might be explained by a side reaction producing CO (RCHO → RH + CO) and the reactivating effect of oxygen addition might be explained by CO2 produced instead of CO in the side reaction. © 1991.
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页码:402 / 408
页数:7
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