TITLE:
Hydrogenation of Glucose on a Carbon-Supported Ru Catalyst: Optimization of the Reaction Conditions
AUTHORS:
Juan J. Musci, María E. Chiosso, Guillermo J. Siri, Mónica L. Casella
KEYWORDS:
3 wt% Ru/C, D-Glucose, Hydrogenation, Kinetic Modeling
JOURNAL NAME:
Advances in Chemical Engineering and Science,
Vol.13 No.3,
June
15,
2023
ABSTRACT: The catalytic hydrogenation of D-glucose over a 3 wt% Ru/C catalyst was studied varying the operating
conditions in mild conditions range to optimize the obtention of D-sorbitol.
The stirring speed, temperature, pressure, and initial glucose concentration
were varied between 250 - 700 rpm, 343 - 383 K, 0.5 - 2 MPa,
and 0.033 - 0.133 M, respectively. To verify
the absence of mass transport limitations, the diffusion of reagents in the
gas-liquid interface, the liquid-solid interface, and the internal diffusion in
the particles were evaluated. Under the operating conditions studied, the
reaction rate showed an order with respect to H2 of 0.586 and with
respect to glucose of 0.406. The kinetic
data were adjusted using 3 general models and 19 different sub-models based on Langmuir-Hinshelwood-Hougen-Watson (LHHW) kinetics. Model 3a was the
best one interpreting the aqueous phase hydrogenation of glucose (both reagents
competitively adsorbed on the catalyst). The H2 adsorption is
dissociative and the rate-limiting step is the surface chemical reaction.