Pellet catalysts dedicated to oxidative coupling of methane (OCM) were prepared with the assistance of 3D printing technology using the casting technique. In this approach, polymeric templates printed using digital light processing technology were applied for pellet catalyst shaping. Three series of cubic-type catalysts varying in external size and number of channels were produced by a one-step procedure of the templates filling with the paste containing Mn₂O₃, Na₂WO₄, α-Al₂O₃, and sodium silicate solution. The pellets containing 2 wt % of Mn₂O₃ and 5 wt % of Na₂WO₄ were characterized by X-ray fluorescence, X-ray diffraction, UV–vis diffuse reflectance, temperature-programmed reduction with H₂, scanning electron microscopy–energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy techniques and tested in OCM. The pellet catalysts exhibited excellent catalytic performance and stability vs time on stream. It has been found that the size of the pellets and their geometry have an impact on the catalytic performance and pumping resistance through the catalyst bed (drop pressure).

中文翻译：

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3D 打印控制的颗粒几何形状对基于 Mn-Na2WO4 的系统在甲烷氧化偶联中催化性能的影响


专用于甲烷氧化偶联 （OCM） 的颗粒催化剂是在 3D 打印技术的帮助下使用铸造技术制备的。在这种方法中，使用数字光处理技术打印的聚合物模板被应用于颗粒催化剂成型。通过模板填充含有_{Mn 2}O₃、Na₂WO₄、α-Al₂O₃ 和硅酸钠溶液的糊体的一步法，生产了三个系列外部尺寸和通道数不同的立方体型催化剂。通过 X 射线荧光、X 射线衍射、紫外-可见漫反射、H₂ 程序升温还原、扫描电子显微镜-能量色散 X 射线光谱和 X 射线光电子能谱技术对含有 2 wt % 的 Mn₂O₃ 和 5 wt % 的 Na₂WO₄ 的颗粒进行了表征，并在 OCM 中进行了测试。颗粒催化剂表现出优异的催化性能和稳定性（与投产时间的关系）。已经发现，颗粒的大小及其几何形状会影响催化性能和通过催化剂床的泵送阻力（滴压）。