Three kinds of new type solid strong acid catalysts S2O 2-8/ZrO2-Al2O3-M2O3（M=Cr,Ce,La） were prepared. Their crystal structure, surface area, acid strength and sulfur content were determined by means of XRD, BET, fl...Three kinds of new type solid strong acid catalysts S2O 2-8/ZrO2-Al2O3-M2O3（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 ZrO2 in the catalysts mainly in tetragonal phase and few in monoclinic phase. The tetragonal phase of ZrO2 and S2O 2-8 are the key factors that guarantee the catalytic activity. Incorporation of appropriate amounts of metallic oxides（Cr2O3,Ce2O3,La2O3） 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 S2O 2-8/ZrO2-Al2O3（2%）-M2O3（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.展开更多
文摘Three kinds of new type solid strong acid catalysts S2O 2-8/ZrO2-Al2O3-M2O3（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 ZrO2 in the catalysts mainly in tetragonal phase and few in monoclinic phase. The tetragonal phase of ZrO2 and S2O 2-8 are the key factors that guarantee the catalytic activity. Incorporation of appropriate amounts of metallic oxides（Cr2O3,Ce2O3,La2O3） 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 S2O 2-8/ZrO2-Al2O3（2%）-M2O3（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.
