Binder-free ceria pastes have been formulated and used to prepare ceria structures with a woodpile arrangement of microchannels through 3D printing. After loading them with nickel, these catalytic structures have been tested for ammonia decomposition to obtain hydrogen, and their performance has been compared with those of conventional Ni/CeO₂ powder catalysts and with that of a conventional cordierite honeycomb washcoated with Ni/CeO₂. Samples have been characterized by N₂ physisorption, inductively coupled plasma optical emission spectrometry (ICP-OES), X-Ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR) and Raman spectroscopy. At the same reaction temperature and flow rate to catalyst weight ratio (F/W), the 3D-printed ceria structures show a catalytic activity much higher than that of the cordierite honeycomb on a reactor volume basis. Additive manufacturing represents a valuable tool to prepare customized ceria-based catalytic structures for practical application with a variety of geometries not attainable with conventional methods.

不含粘结剂的二氧化铈糊剂已经配制并用于通过3D打印以微通道的木桩排列方式制备二氧化铈结构。在将它们装载镍之后，已经测试了这些催化结构的氨分解以获得氢，并且将它们的性能与常规的Ni / CeO ₂粉末催化剂的性能以及与用Ni / CeO ₂涂层的常规堇青石蜂窝的性能进行了比较。样品的特征在于N ₂物理吸附，电感耦合等离子体发射光谱（ICP-OES），X射线衍射（XRD），扫描电子显微镜（SEM），高分辨率透射电子显微镜（HRTEM），X射线光电子光谱（XPS），傅里叶变换红外光谱（FTIR）和拉曼光谱。在相同的反应温度和流速与催化剂重量比（F / W）的情况下，以3D打印的二氧化铈结构显示的催化活性要远远高于堇青石蜂窝的反应活性（基于反应器体积）。增材制造代表了一种有价值的工具，可用于制备定制的基于二氧化铈的催化结构，以实际应用中具有常规方法无法实现的各种几何形状。