Solid(catalyst)-solid(soot) contact is a crucial factor in diesel soot catalytic combustion, and rationally optimizing solid(catalyst)-solid(soot) contact is a promising yet challenging pathway for improving catalytic diesel soot combustion performance. Here, we report a micrometer scaled sheet-type CeO₂-ZrO₂ soot oxidation catalyst. The nitrogen adsorption-desorption result indicates that soot particulates are barely able to enter into the inner pore of the catalyst (average pore size < 20 nm) due to the large size of filamentous soot agglomeration (reaching up to 1 μm). Thus the catalyst-soot contact mainly depends on the catalyst external surface and morphology. Electron microscope images confirm the presence of microsheet agglomerations of the prepared CeO₂-ZrO₂ catalyst, which is an advantage for enhancing the adherence of soot filaments on catalyst. Compared to common CeO₂-ZrO₂ particle catalyst, the CeO₂-ZrO₂ microsheet shows a remarkably higher macrolevel soot combustion performance. Interestingly, the single catalytic site activity (intrinsic activity) of CeO₂-ZrO₂ microsheet is not enhanced by the micro-structure. Thus the enhanced soot combustion efficiency could be ascribed to the improving of catalyst-soot contact. And therefore, this work suggests that constructing structured catalyst at micrometer level is an efficient way to improve the solid(catalyst)-solid(soot) contact efficiency and thereby boost the diesel soot combustion performance.

固（催化剂）-固（碳烟）接触是柴油机碳烟催化燃烧的关键因素，合理优化固（催化剂）-固（碳烟）接触是提高催化柴油机碳烟燃烧性能的一条有前途但具有挑战性的途径。在这里，我们报告了微米级片状CeO ₂ -ZrO ₂烟尘氧化催化剂。氮吸附-解吸结果表明，由于丝状烟尘团聚的大尺寸（达到1μm），烟尘颗粒几乎无法进入催化剂的内孔（平均孔径<20 nm）。因此，催化剂-烟灰接触主要取决于催化剂外表面和形态。电子显微镜图像证实所制备的 CeO ₂存在微片团聚-ZrO ₂催化剂，这是提高烟灰丝在催化剂上的附着力的优势。与普通的CeO ₂ -ZrO ₂颗粒催化剂相比，CeO ₂ -ZrO ₂微片显示出显着更高的宏观碳烟燃烧性能。有趣的是，CeO ₂ -ZrO ₂的单催化活性（本征活性）微片没有被微结构增强。因此，提高的烟灰燃烧效率可归因于催化剂-烟灰接触的改善。因此，这项工作表明，在微米级构建结构化催化剂是提高固体（催化剂）-固体（烟尘）接触效率，从而提高柴油烟尘燃烧性能的有效方法。