通过水热法制备出暴露(010)和(101)晶面的片状勃姆石,通过焙烧可得到暴露(110)和(111)晶面的片状氧化铝;不同焙烧升温程序保持了片状氧化铝形貌、孔结构、晶面等特征的一致性,实现了表面酸性作为单一变量的可控调节。γ-Al₂O₃界面Lewis酸增多能够降低Pt/γ-Al₂O₃催化氧化乙烯的起活温度。Pt/Al₂O₃-2相比Pt/Al₂O₃-600样品,酸性的提高促使其在190℃和120 000 h^-1空速下乙烯转化速率提高约4倍,并在240℃达到完全氧化。

In order to improve the activity of degrading volatile organic compounds (VOCs) on precious metal-supported catalysts,adjusting the properties of the support of catalysts is one of important methods without need to increase the content of precious metals.Quadrilateral boehmite flakes with exposed (010) and (101) planes are prepared through the hydro-thermal method,and is calcined to obtain flake alumina with exposed (110) and (111) planes.The morphology,pore structure,crystal plane and other characteristics of the obtained flake γ-Al₂O₃ are maintained under different heating temperature programs,and the controllable adjustment of surface acidity as a single variable is realized.The increase of Lewis acidity of γ-Al₂O₃ can reduce the activation temperature of Pt/Al₂O₃ in oxidation of ethylene.The conversion speed of ethylene over Pt/Al₂O₃-2 with higher acidity compared with Pt/Al₂O₃-600 is about 5 times that over Pt/Al₂O₃-600 under 190℃ and GHSV=120 000 h^-1,and ethylene reaches complete oxidation at 240℃.

吕雪婷(1989-),女,硕士,工程师,研究方向为工业催化和煤化工,xueting.lv@chnenergy.com.cn