Selective hydrogenation of 2-butyne-1,4-diol to 2-Butene-1,4-diol (cas 110-64-5): roles of ammonia, catalyst pretreatment and kinetic studies

Add time:08/26/2019    Source:sciencedirect.com

The selective hydrogenation of 2-butyne-1,4 diol to cis-2-butene-1,4 diol has been studied using different palladium-supported catalysts. With 1% Pd/C catalyst, the major product formed was 1,4-butanediol, along with other side products such as butenediol, γ-hydroxy butyraldehyde, n-butyraldehyde and n-butanol. Role of supports and ammonia was very significant in achieving a high selectivity to the intermediate, 2-butene-1,4-diol. A selective hydrogenation of 2-butyne-1,4-diol to give cis-2-butene-1,4-diol was achieved using 1% Pd/CaCO3–NH3 catalyst system. Effects of catalyst pretreatment with both 2-butyne-1,4-diol and H2 on the catalyst activity and selectivity were investigated. It was found that the catalyst activity increased substantially, while the selectivity to 2-butene-1,4-diol decreased slightly with hydrogen-pretreated catalyst. The effects of hydrogen pressure, catalyst loading, initial concentrations of 2-butyne-1,4-diol and ammonia on the initial rate of hydrogenation were also studied in a batch reactor in a temperature range of 323–353 K. All the data obtained were in the kinetic regime under the conditions of the present work, based on which a Langmuir–Hinshelwood (L–H) type rate model was proposed. To verify the applicability of the kinetic model over a wide range of conditions, a batch reactor model was also developed. The agreement between the predicted concentration vs. time profiles with the experimental results was excellent.

We also recommend Trading Suppliers and Manufacturers of 2-Butene-1,4-diol (cas 110-64-5). Pls Click Website Link as below: cas 110-64-5 suppliers

Prev:Selective conversion of cis-2-Butene-1,4-diol (cas 110-64-5) to 2-hydroxytetrahydrofuran over K, Ca and Ba metals-promoted Ru/SiO2 catalysts: Role of the promoter
Next:Hydrogenation versus hydrogenolysis in the reaction of cis-2-Butene-1,4-diol (cas 110-64-5) over supported platinum catalysts: Kinetic aspects)