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Hydrogenation of buta-l,3-diene over

All these metals exhibited high selectivity (97-100%) for butene formation. Also, the deuterium distribution within each butene was [Pg.180]

Product compositions from butadiene hydrogenation vary greatly depending on the catalyst utilised. Some examples and associated references are detailed in Table 5.1. [Pg.181]

The mechanism for the reaction over alumina supported Go and Ni catalysts based on the deuterium tracer studies is believed to be one in which the adsorbed diene and adsorbed hydrogen are in dynamic equilibrium with a- and o-7t-bonded half-hydrogenated species, resulting in the wide distribution of deuterium in the observed butanes (Fig. 5.3). [Pg.181]

In the subsequent rate determining steps hydrogen atom addition to the a-adsorbed butenyl gives the but-l-ene isomer whereas the addition of hydrogen to the CT-7t-adsorbed butenyl occurs via a 7t-allylic transition state. In process B, butadiene molecules can be adsorbed either in the transoid or cisoid conformation, the former yielding but-l-ene and ram-but-2-ene by 1 2 and 1 4 addition respectively and the latter yielding but-l-ene and ds-but-2-ene by the same mechanism. Hence if the required product is the alk-1-ene, then the catalyst of choice would be one with an electronic [Pg.181]

F re 5.3 Simplified mechanism for the hydrogenation of buta-1,3-diene over metals other than Pd. [Pg.182]




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Buta-1,3-diene

Buta-l,3-dien

Buta-l,3-diene

Diene, hydrogenation

Dienes hydrogenation

Hydrogenation of buta-l,3-diene

Hydrogenation of dienes

L hydrogenation

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