5 years ago

Kinetic Modeling of Acetic Acid Hydrogenation to Ethanol over K-Modified PtSn Catalyst Supported on Alumina

Kinetic Modeling of Acetic Acid Hydrogenation to Ethanol over K-Modified PtSn Catalyst Supported on Alumina
Haitao Zhang, Mingchuan Zhou, Weiyong Ying, Hongfang Ma
Experiments for acetic acid hydrogenation and catalyst characterizations were conducted to study the kinetics of hydrogenation and esterification over PtSn impregnated on Al2O3 catalyst (PtSn/Al2O3), K doped on PtSn/Al2O3 catalyst (K/PtSn/Al2O3), and PtSn impregnated on K/Al2O3 catalyst (PtSn/K/Al2O3). Kinetic parameters such as activation energy, dissociation enthalpy, and adsorption heat of elementary reaction for hydrogenation and esterification were determined on the basis of Langmuir–Hinshelwood model. After the addition of 0.5 wt % K to PtSn/Al2O3, activation energy of hydrogenation decreased from 20.8 to 11.5 kJ/mol and activation energy of esterification increased from 22.3 to 31.7 kJ/mol. The results of dissociation energy and adsorption heat reflect that K/PtSn/Al2O3 can improve spillover of hydrogen and desorption of ethanol. PtSn/K/Al2O3 had the opposite effect. Potassium also enhanced dissociation of C–OH bond to form more acetyl species. Good agreement was obtained upon comparison of the experimental and calculated data.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b01859

DOI: 10.1021/acs.iecr.7b01859

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