Selective hydrogenation of 1,3-butadiene : improving the selectivity to butene using a solid Pd-catalyst with an ionic liquid layer (SCILL)

Titelangaben

Mangartz, Theresa ; Häcker, L. ; Korth, Wolfgang ; Kern, Christoph ; Jess, Andreas:
Selective hydrogenation of 1,3-butadiene : improving the selectivity to butene using a solid Pd-catalyst with an ionic liquid layer (SCILL).
In: Oil Gas. Bd. 40 (2014) Heft 2 . - S. 84-90.
ISSN 0342-5622

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Abstract

Catalytic selective hydrogenation reactions are important for refinery processes, petrochemical applications as well as for the fine chemicals industry. For polyunsaturated hydrocarbons, one of the possible intermediates is in most cases the product of choice. Thus, the main goal in catalyst research is to increase the selectivity of the desired intermediate, whilst minimizing loss of activity. Using the concept of a solid ccatalyst with ionic liquid layer (SCILL), where the internal surface of a heterogenous catalyst coated with a thin film of ionic liquid (IL), the selectivity to such intermediates can be increased significantly. Moreover, the design of the IL allows minimization of the activity loss of the SCILL-catalyst in camparison to the uncoated catalyst. In this article the SCILL-concept is shown for the selective gas phase hydrogenation of 1,3-butadiene. With regard to overall butene selectivity (trans-2-,cis-2-, 1-), the performance of a commercial Pd-catalyst was enhanced to above 99% when transformed into a Pd-SCILL-catalyst by coating with IL 1,3-dimethylimidazolium dimethyl phosphate ([C1MIM][DMP]) at the expense of activity. Even at high residence time or hydrogen partial pressure the outcome of the reaction (Sbutenes>99%) did not change. The influence of the IL cation structure on regaining activity is presented, and the role of the interplay between catalytically active metal and ionic liquid is investigated to understand the SCILL-effect.