Atmospheric pressure studies of selective 1,3-butadiene hydrogenation on Pd single crystals: effect of CO addition
作者： J SILVESTREALBERO , G RUPPRECHTER , H FREUND
DOI: 10.1016/J.JCAT.2005.07.009
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摘要: Abstract The selective hydrogenation of 1,3-butadiene on Pd(111) and Pd(110) model catalysts was studied at atmospheric pressure in the temperature range 298–373 K. In initial stages reaction, 1-butene, trans-2-butene, cis-2-butene were main reaction products. After full consumption, 1-butene readsorbed reacted to n-butane via trans/cis-2-butene isomerization. Because favored Pd(111), exhibited a higher selectivity for butene formation. Increasing accelerated both processes, long times. Addition small amounts CO drastically changed Pd(110); that is, completely suppressed, whereas butenes isomerization cis- trans-2-butene hardly affected. This can be rationalized by considering reduces hydrogen surface concentration level is still sufficient isomerisation but too low hydrogenation. contrast, catalytic activity basically vanished presence traces. Possible mechanisms are discussed.
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