Catalysis of Organic..

254 Amination of Isobutanolnoteworthy that the conversion of i-butanol was ca. 86%, and yield of monosecondaryand tertiary amine was ca. 18, 65 and 3%, respectively (see Figure 1). Theconversion and the amine yield listed in Table 1 indicate that the H 2 pressure haslittle effect on catalytic performance in the range investigated.100Conversion, yields, %8060402000 10 20 30 40 50 60time-on-stream, hFigure 1. Amination of i-butanol. Time-on-stream experiment.Reaction condition: T=225°C;WHSV=1.0g/(g catalyst h); P=13bar; NH 3 /iBuOH=1.4;H 2 /NH 3 =1.6. Abbreviations: -conversion; yields of (iBu) 2 NH, iBuNH 2 , and(iBu) 3 N, , •, and , respectively.Table 1. Amination of isobutanol. Effect of hydrogen pressureP, bar Conversion, %Yield, %iBuNH 2 (iBu) 2 NH (iBu) 3 N7 89 19 66 411 88 20 65 312 90 19 68 313 89 18 67 414 91 19 69 321 88 19 67 231 89 19 67 3Reaction condition: T=225°C;WHSV=1 g/(g catalyst h); NH 3 /iBuOH=1.6; H 2 /NH 3 =1.6Catalytic activity data summarized in Table 2 indicate that both the reactiontemperature and the NH 3 /iBuOH ratio strongly affect the conversion of iBuOH andthe selectivity and thus the yield of secondary amine. Upon increasing the reactiontemperature and the NH 3 /iBuOH ratio the conversion of alcohol significantlyincreased. Because of the interaction of the two parameters, i.e. the temperature andthe NH 3 /iBuOH ratio, the yield and the selectivity of secondary amine shows up