Butanediols Production from Erythritol on Rh promoted catalysts

VIRGILIO. EMANUEL MARTÍN; PADRÓ. CRISTINA; SAD. MARIA EUGENIA

LATIN AMERICAN APPLIED RESEARCH

PLAPIQUI(UNS-CONICET)

Lugar: Bahia Blanca; Año: 2020

0327-0793

The C-O hydrogenolysis of Erythritol (ERY) to Bu-tanediols was studied in aqueous solution at 473 K and 25 bar of H2 using Rh/ReOx/TiO2 and the mono-metallic Rh/TiO2 and ReOx/TiO2 catalysts. The solids were characterized by temperature programmed reduction (TPR), TEM and XPS. TPR and XPS showed that ReOx species are close to Rh particles leading to reduction at lower temperature than Re on monometallic catalyst. However, some segregated Rhenium species were suspected by TPR profile for the bimetallic catalyst and detected by TEM. Re/TiO2 exhibited low activity forming only products from dehydration and epimerization. Although Rh/TiO2 showed high activity (total conversion at 14 h), was more selective to C-C cleavage leading to lower car-bon products. Rh/ReOx/TiO2, showed instead, a good activity and selectivity towards C-O hydrogenolysis route yielding 37.5% of Butanediols. Activation en-ergy and reaction orders on ERY (0.58) and H2 (0.53) were estimated from experiences made at different reaction conditions.