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Al助剂对超强酸WO_x/ZrO₂机械应力稳定性的改善

Effect of Aluminum on the Mechanical Stress Stability of WO_x/ZrO₂ Superacid

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【Author】 TIAN Ge1,2,XU Yunpeng1,XU Zhusheng,TIAN Zhijian1,LIN Liwu1(1 Dalian Institute of Chemical Physics,The Chinese Academy of Sciences,Dalian 116023,Liaoning,China;2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China)

【机构】中国科学院大连化学物理研究所；中国科学院大连化学物理研究所辽宁大连116023中国科学院研究生院；北京100049；辽宁大连116023；

【摘要】载体ZrO2以四方相(t相)结构存在是WOx/ZrO2形成超强酸结构和高催化活性的必要条件.研究表明,机械处理(研磨和压片)可导致WOx/ZrO2的载体发生四方相向单斜相的部分转变,从而降低Pt/WOx/ZrO2的正庚烷异构化活性.添加Al助剂明显提高了载体四方相结构对机械应力的稳定性,从而维持了其催化活性.更多还原

【Abstract】 Tetragonal structure of ZrO₂ support is very important for WO_x/ZrO₂ catalysts to be highly active.In this study,it was found that mechanical stress treatments（grinding in a mortar or pressing under 50 MPa） resulted in a partial phase transformation of WO_x/ZrO₂ from tetragonal ZrO₂ to monoclinic ZrO₂ and also decreased the n-heptane isomerization activity of the Pt/WOx/ZrO₂ catalyst.The addition of aluminum greatly improved the resistance of WO_x/ZrO₂ to mechanical stress and maintained its n-heptane isomerization activity.更多还原