Higher Alcohol Synthesis Using K-Doped CoRhMoS 2 /MWCNT Catalysts: Influence of Pelletization, Particle Size and Incorporation of Binders

摘要: In this study, alkalinized MWCNT supported MoS2 catalysts have been doubly-promoted with Co and Rh. Catalysts were prepared by the conventional co-impregnation method stabilized under argon atmosphere. Characterization of oxidic samples BET revealed that mesoporosity pristine support was not compromised after loading a combined total 30 wt% metals (9 wt% K, 4.5 wt% Co, 1.5 wt% Rh, 15 wt% Mo) on support; however, significant decrease in specific surface area observed. Broad angle XRD analysis confirmed homogenous dispersion catalyst support. Two grain sizes first investigated to elucidate effect particle size: finely ground powder (88 μm) pelletized form (1,780 μm). Despite alcohol yield 0.261 g/(gcat h) observed conducting higher synthesis reaction at T = 330 °C, P = 8.3 MPa, H2/CO = 1.25, GHSV = 3.6 m STP 3 /(kgcat h) for fine powdered sample, relatively pressure drop could be minimized using catalyst. Finally, systematic study variety selected binders conducted gain insight catalyst’s applicability industrial purposes. Three namely: bentonite clay, coal tar, humic acid thus investigated; taking into consideration factors such as melting point binder requirement per The CO conversions evaluated two binder-free (88 1,700 μm) showed performed better than (binder-free, 1,700 μm); yielding maximum ethanol selectivity 38.5 % steady-state conditions.