Experimental Study of the Effect of Catalyst Properties on Hydrodynamics and Mass Transfer in a Slurry Reactor


This work was devoted to study the influence of wellknown catalyst carriers (activated utilized in catalyticreactions carbon and silica) on the hydrodynamicparameters and mass transfer rate in a slurry reactor. Theinfluence of silica and activated carbon particlesconcentration up to 20% v/v on regime transition, averagegas holdup, mass transfer coefficient, and CO2 removalwas studied in a semi- batch slurry bubble column reactor(SBC) with a porous gas sparger. The effects ofhydrophobicity and surfactant were also investigated. Itwas concluded the gas holdup is reduced and the point oftransition from laminar to turbulent regime is shifted toless gas velocity when the hydrophobic and hydrophilicparticles concentration was larger than 3% (v/v). TheParticle hydrophobicity, gas velocity, and electrolyteconcentration have positive impacts on gas holdup whileslurry concentration gave a different trend. Experimentalresults show that the optical fiber probe is valid to use in aslurry bubble column and can also generate useful datasuch as bubble rise velocity and bubble distribution. Theoptical fiber probe was proved to be good technique forestimation of volumetric mass transfer coefficient withinan error of ±18%. Mass transfer experiments withgaseous CO2 showed a behavior of removal in the sametrend of increasing gas holdup with gas velocity. Anoticeable removal of gaseous pollutants was observedfor non-wettable particles at solid loading of 3%v/v.Mathematical correlations were formulated for CO2removal as function of studied operating variables withcorrelation factors of 0.95-0.98. The present study depictsthe effect of catalyst carrier on the hydrodynamiccharacteristics and mass transfer in a slurry reactor.