Platinum catalyzed hydrogenation of 2-butyne-1,4-diol

✍ Scribed by M.M. Telkar; C.V. Rode; R. Jaganathan; V.H. Rane; R.V. Chaudhari

• Book ID: 104421769
• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 285 KB
• Volume: 187
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(01)00457-5

✦ Synopsis

Hydrogenation of 2-butyne-1,4-diol (B 3 D) using 1% Pt/CaCO 3 catalyst was carried out to give 2-butene-1,4-diol (B 2 D) or butane-1,4-diol (B 1 D) selectively or a mixture of two diols eliminating the formation of acetal, aldehyde, and alcohols as side products. In presence of ammonia, nearly complete selectivity to B 2 D was obtained in a batch reactor while, in a fixed bed reactor total selectivity to B 1 D was obtained. Effect of concentration of ammonia, metal loading and catalyst pre-treatment on catalyst activity and selectivity has been investigated in a batch reactor. The formation of B 1 D and B 2 D is explained on the basis of associative or dissociative adsorption of B 3 D via carbene and carbyne type intermediates which react with adsorbed hydrogen to give the corresponding products. A kinetic model based on Langmuir-Hinshelwood (L-H) type mechanism has been proposed which shows a good agreement with experimental data.