论文部分内容阅读
Three kinds of new type solid strong acid catalysts S_2O 2-_8/ZrO_2-Al_2O_3-M_2O_3(M=Cr,Ce,La) were prepared. Their crystal structure, surface area, acid strength and sulfur content were determined by means of XRD, BET, flow Hammett indicator method and chemical analysis. Their catalytic activities in esterification reaction of acetic acid with n-butanol were studied. The results showed that ZrO_2 in the catalysts mainly in tetragonal phase and few in monoclinic phase. The tetragonal phase of ZrO_2 and S_2O 2-_8 are the key factors that guarantee the catalytic activity. Incorporation of appropriate amounts of metallic oxides(Cr_2O_3,Ce_2O_3,La_2O_3) into the catalyst favors the stabilization of sulfur species and surface area, which increase the activity sites on the catalyst. The experimental results showed that three catalysts S_2O 2-_8/ZrO_2-Al_2O_3(2%)-M_2O_3(1%)(M=Cr,Ce,La) had higher catalytic activity in mentioned esterification, with the conversion of acetic acid reached 96.8%, 95.7% and 96.1%, respectively. The preparation condition of the catalysts showed great influence on the catalytic activity.
Three kinds of new type solid strong acid catalysts S 2 O 2-8 / ZrO 2 -Al 2 O 3 -M 2 O 3 (M = Cr, Ce, La) were prepared. Their crystal structure, surface area, acid strength and sulfur content were determined by means of XRD, BET, flow Hammett indicator method and chemical analysis. Their catalytic activities in esterification reaction of acetic acid with n-butanol were studied. The results showed that ZrO_2 in the catalysts mainly in tetragonal phase and few in monoclinic phase. The tetragonal phase of ZrO 2 and Incorporation of appropriate amounts of metallic oxides (Cr 2 O 3, Ce 2 O 3, La 2 O 3) into the catalyst favors the stabilization of sulfur species and surface area, which increase the activity sites on the catalyst. The experimental results showed that three catalysts S 2 O 2-8 / ZrO 2 -Al 2 O 3 (2%) - M 2 O 3 (1%) (M = Cr, Ce, La) had higher catalytic activity in mentioned esterification, with the conversion of acetic acid reached 96 . 8%, 95.7% and 96.1%, respectively. The preparation condition of the catalysts showed great influence on the catalytic activity.