Customizable Heterogeneous Catalysts: Nonchanneled Advanced Monolithic Supports Manufactured by 3D-Printing for Improved Active Phase Coating Performance
Customizable Heterogeneous Catalysts: Nonchanneled Advanced Monolithic Supports Manufactured by 3D-Printing for Improved Active Phase Coating Performance
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DOI：
10.1021/acsami.0c14703
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发表时间：
2020-12-09
影响因子：
9.5
通讯作者：
Bueno-Lopez, Agustin
中科院分区：
文献类型：
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作者：
Chaparro-Garnica, Cristian Y.;Jorda-Faus, Pepe;Bueno-Lopez, Agustin
三维（3D）打印催化剂正在被越来越多地研究;然而，这些研究中的大多数集中在催化活性整体的获得上，因此通常获得和测试传统的通道整体催化剂，忽视了3D打印可能带来的优势。这项工作更进一步，利用3D打印提供的多功能性，获得了具有专门设计的几何形状的先进整体。作为一个概念的证明，nonchanneled先进的单片（NCM）的支持，包括几个横向盘含有存款的活性相沉积和狭缝的气体循环，获得和测试中的CO-PrOx反应。结果证明，NCM载体显示出与常规通道化整料（CM）相比上级催化性能。与粉末或CM样品相比，NCM中活性相可以在化学控制下工作的温度区域，因此以更有效的方式增加了31%。在通过NCM的流体路径内发生湍流，这增强了试剂和产物朝向和从活性位点到流体本体的传质，有利于化学反应速率。无通道的整料还通过曲折的路径改善了热分散，降低了活性部位的局部温度。因此，反应物和产物在整料内部的运输方式起着至关重要的作用，并且这受到整料内部几何形状的影响。
Three-dimensional (3D)-printed catalysts are being increasingly studied; however, most of these studies focus on the obtention of catalytically active monoliths, and thus traditional channeled monolithic catalysts are usually obtained and tested, losing sight of the advantages that 3D-printing could entail. This work goes one step further, and an advanced monolith with specifically designed geometry has been obtained, taking advantage of the versatility provided by 3D-printing. As a proof of concept, nonchanneled advanced monolithic (NCM) support, composed of several transversal discs containing deposits for active phase deposition and slits through which the gas circulates, was obtained and tested in the CO-PrOx reaction. The results evidenced that the NCM support showed superior catalytic performance compared to conventional channeled monoliths (CMs). The region of temperature in which the active phase can work under chemical control, and thus in a more efficient way, is increased by 31% in NCM compared to the powdered or the CM sample. Turbulence occurs inside the fluid path through the NCM, which enhances the mass transfer of reagents and products toward and from the active sites to the fluid bulk favoring the chemical reaction rate. The nonchanneled monolith also improved heat dispersion by the tortuous paths, reducing the local temperature at the active site. Thus, the way in which reactants and products are transported inside the monoliths plays a crucial role, and this is affected by the inner geometry of the monoliths.