NOVEL APPROACH FOR CONTROLLING CATALYTIC SITE FOR LOW-TEMPERATURE STEAM REFORMING

为了获得低温蒸汽重整所需的高表面积载体，将溶解于苯中的异丙醇水解分解制备了ZrO_2和ZrO_2- y_2o_3。在80ºC的温度下，用过量的蒸馏水在流动的干氮中进行水解。将所得的沉淀液在100ºC的温度下干燥，然后在500ºC的空气或氮气中焙烧1 h。ZrO_2和ZrO_2- y_2o_3的比表面积随着水解水的增加而增加，ZrO_2- y_2o_3的比表面积随着钇含量的增加而增加。得到了比表面积为130m^2/g的ZrO_2，并稳定得到了比表面积为200m^2/g的15 mol% Y^<3+>的ZrO_2。此外，尽管ZrO_2和ZrO_2- y_2o_3的晶体结构不同，但ZrO_2的晶格应变与表面积有明确的关系。

In order to obtain a high surface area support for the low-temperature steam reforming, ZrO_2 and ZrO_2-Y_2O_3 were prepared by the hydrolytic decomposition of the corresponding isopropoxide dissolved in benzene. The hydrolysis was carried out at 80ﾟC using an excess amount of distillled water in flowing dry nitrogen. The precipotates thus obtained were dried at 100ﾟC followed by calcination at 500ﾟC in air or nitrogen for 1 h. The specific surface areas for both of the ZrO_2 and ZrO_2-Y_2O_3 increased with increasing amount of water added for hydrolysis, and the surface areas for ZrO_2-Y_2O_3 increased with increasing yttrium content. A ZrO_2 having a surface area of 130m^2/g was produced, and a stabilized tetragonal ZrO_2 with 15 mol% Y^<3+> having a surface area of 200m^2/g was produced. Furthermore, despite the difference in the ZrO_2 and ZrO_2-Y_2O_3 crystal structures, the lattice-strain of ZrO_2 has been unequivocally related to the surface area.