Catalysis of Organic..

Snåre et al. 423Ethyl stearate conversion (%)100806040200.6g (300˚C)0.4g (300˚C)0.6g0.6g (0.07ml/min)0.4g0.4g (repeated)0.2g00 60 120 180 240 300Time-on-stream (min)Figure 7. The effect of catalyst mass on ethyl stearate conversion. Reactionconditions: 5 mol% ethyl stearate in hexadecane, T=270 ˚C, p= 1 bar and V’=0.1ml/min.Table 4. Experimental results in the deoxygenation of ethyl stearateRun nr. Catalyst mass Temperature Residence time Initial conversionSelectivity (mol%)(g) (˚C) (min) (%) S n-C17 S ΣC17I** 0.2 270 4.0 67 - 2.6II 0.2 270 4.0 17 95.0 0.4III 0.4 270 8.2 23 95.5 -IV 0.6 270 12.0 59 93.8 1.7V*** 0.6 270 17.2 100 99.5 0.5VI 0.4 270 8.2 20* 93.0 1.1VII 0.4 300 8.2 48* 91.0 4.3VIII 0.4 330 8.2 89* 94.2 4.9IX 0.4 360 8.2 100* 95.4 3.7X 0.6 300 12.0 100* 99.5 0.5* sample wthdrawn after 40 min of pumping**non-pretreated***volumetric flow, V'=0.0 7 ml/min*sample withdrawn after 40 min. of pumping**non-pretreated***volumetric flow, V=0.07 ml/minIn order to elucidate the effect of liquid products on the catalyst deactivation,selectivity versus conversion was investigated. As indicated above particularlyinteresting was the rapid decrease of conversion over 0.6 g compared to 0.4 g and 0.2g of catalyst, however a comparison of product selectivities as a function ofconversion gave no direct explanation for this rapid deactivation. Very similar