STUDY ON α-PINENE ISOMERIZATION CATALYZED BY SO_4~(2-)/ZrO_2 SOLID SUPERACID

Effects of conditions for preparation of SO2-4/ZrO2 solid superacid, such as concentration of H2SO4, calcination temperature,calcination time with respect to its catalytic activity were studied.Results showed that as calcination temperature increased,catalytic activity of SO2-4/ZrO2 catalysts decreased under lower concentration of H2SO4 and calcination time 3 h.Catalytic activity was not obviously affected by calcinations time under lower concentration of H2SO4 and lower calcination temperature,while products distribution was affected to a certain extent.SO2-4/ZrO2 solid superacid was used to catalyze αpinene isomerization at 130 ℃±2 ℃,mass part of catalyst 4% to give results of αpinene conversion at 88.8%,and camphene selectivity at 55.4%.Hammett constants of several catalysts were measured,and surface properties of SO2-4/ZrO2 catalysts were tested by TEM.