ZrO_2／SO_4^(2－)固体超强酸催化剂研究（Ⅱ）——表面化学和酸中心形成过程

Studies on the ZrO 2/SO 2- 4 Solid Superacid Catalysts (Ⅱ)Surface Chemistry and Formation Process of the Acidic Sites

用ＸＲＤ、ＬＲＳ研究了ＺｒＯ２／ＳＯ２－４和ＺｒＯ２晶相。用Ｎ２吸附法、化学分析法和滴定法测定了ＺｒＯ２／ＳＯ２－４的比表面、Ｓ含量和酸强度，ＸＰＳ测定ＺｒＯ２／ＳＯ２－４的能量。实验结果表明，ＳＯ２－４的存在延迟了ＺｒＯ２的晶变，提高了晶变温度，在ＺｒＯ２／ＳＯ２－４体系中不存在水和游离Ｈ２ＳＯ４，体系酸强度最高时ＺｒＯ２主要呈四方晶系。

The crystallization and phase transition of the ZrO 2/SO 2- 4 and ZrO 2 were studied by XRD and LRS. Surface area. S% and acidic strength were measured by N 2 adsorption method, chemical analysis method and tritration method. It was shown that SO 2- 4 ion retards crystal phase change and enhances phase change temperature. There was no water and free H 2SO 4 present in the ZrO 2/SO 2- 4 superacid system, and acidic strength of the superacid system reached the maxinum as the ZrO 2 was of a tetragonal crystal phase.