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采用水热法制备了结晶良好的层状α-Zr(HPO_4)_2(α-ZrP)化合物,并利用XRD、SEM、FT-IR、TG、NH_3-TPD等技术表征了样品的物相、结晶度、热稳定性及表面酸性等;以α-蒎烯异构化为模型反应表征了样品的酸催化活性.结果表明:采用水热法可以制备出物相单一且具有良好结晶度和热稳定性的层状α-Zr(HPO_4)_2;磷酸浓度对α-ZrP的物相、结晶度有明显影响,水热条件对其表面酸性影响较大;在磷酸浓度为8M,P∶Zr(摩尔比)=3∶1,180℃下水热24 h制备的α-ZrP样品同时具有弱酸性位和中强度酸性位,150℃下反应4 h后α-蒎烯的转化率可达88.31%,具有较强的酸催化活性,异构化主产物对伞花烃的选择性高达69.45%
The crystalline α-Zr (α-ZrP) layered compounds with good crystallinity were prepared by hydrothermal method and characterized by XRD, SEM, FT-IR, TG and NH 3 -TPD techniques. Degree of thermal stability and surface acidity, etc .; the α-pinene isomerization model reaction characterization of the acid catalytic activity of the sample results show that: the use of hydrothermal method can be prepared single-phase and has good crystallinity and thermal stability (HPO_4) _2. The concentration of phosphoric acid has a significant effect on the phase and crystallinity of α-ZrP. The hydrothermal conditions have a great influence on the surface acidity. When the concentration of phosphoric acid is 8 M, P: Zr Ratio = 3: 1, α-ZrP samples prepared by hydrothermal treatment at 180 ℃ for 24 h have weak acidic sites and moderately acidic sites, and the conversion of α-pinene can reach 88.31% after reaction at 150 ℃ for 4 h. Of the acid-catalyzed activity, the isomerization of the main product on the selectivity of cymene up to 69.45%