III International Conference

PP-II-63Х X n-С н-C 6 , %1008060Sulfate contentCalcination temperatureConcentration of precursorsolutionpH of precipitationAging time4020060 80 100 120 140SZ particle size, AFig. 1. Influence of particle size of SZ depending on the way ofits regulation on n-hexane conversionAs can be seen from Fig. 1, varying the conditions of precipitation of ZrO 2·xH 2 Oinfluences the particle size of SZ, which is formed in tetragonal modification due to furthersulfation and calcination. As the crystallite size of material decreases the conversionincreases. The smallest particle size which provides maximum activity of n-hexaneisomerization catalyst is 70-90 Å.279