A series of doped barium cerate perovskite catalysts (BaCeO_3-*, BaCe_0.8Zr_0.2O_3-* and BaCe_0.8Zr_0.1Co_0.1O_3-*) were prepared by a two-step process consisting of solid-state synthesis followed by high-energy ball milling. X-ray diffraction studies showed that the dopants (Zr and Co) were incorporated into the perovskite lattice. TPR studies revealed that the high-energy ball milling process significantly enhanced the reducibility of the catalysts. XPS data indicated a shift in electron density away from the metal centres and an increase in defect oxides, for the high-energy ball milled catalysts, which led to enhanced activity of the catalysts. The catalytic performance was evaluated in a fixed bed reactor system under simulated diesel exhaust conditions, including water. The high-energy ball milled barium cerate sample co-doped with Zr and Co exhibited NO_x storage of ∼228 µmol/g at 380 °C and a T_max, at which the rate of soot oxidation reaction was maximum, of 436 °C.

一系列掺杂的铈酸钡钙钛矿催化剂（BaCeO _3-*， BaCe _0.8 Zr _0.2 O _{3- *}和BaCe _0.8 Zr _0.1 Co _0.1 O _{3- *}）是通过两步过程制备的，该过程包括固态合成，然后进行高能球磨。X射线衍射研究表明，掺杂剂（Zr和Co）被掺入钙钛矿晶格中。TPR研究表明，高能球磨工艺显着提高了催化剂的还原性。XPS数据表明，对于高能球磨催化剂，电子密度远离金属中心，并且缺陷氧化物增加，这导致催化剂活性增强。在固定床反应器系统中在包括水在内的模拟柴油机排气条件下评估了催化性能。高能球磨铈酸钡的样品共掺杂有锆和Co显示出NO _X的存储~228微摩尔/克，在380℃和T_最大，在该温度下烟灰氧化反应的最大速率为436°C。