Multi-Scale Studies of 3D Printed Mn–Na–W/SiO₂ Catalyst for Oxidative Coupling of Methane

• Main Authors: Tim Karsten, Vesna Middelkoop, Dorota Matras, Antonis Vamvakeros, Stephen Poulston, Nicolas Grosjean, Benjamin Rollins, Fausto Gallucci, Hamid R. Godini, Simon D. M. Jacques, Andrew M. Beale, Jens-Uwe Repke
• Format: Article
• Language: English
• Published: MDPI AG 2021-02-01
• Series: Catalysts
• Subjects: oxidative coupling of methane (OCM), fixed bed reactors; 3D printed catalysts; X-ray diffraction computed tomography (XRD-CT); operando chemical imaging
• Online Access: https://www.mdpi.com/2073-4344/11/3/290

This work presents multi-scale approaches to investigate 3D printed structured Mn–Na–W/SiO₂ catalysts used for the oxidative coupling of methane (OCM) reaction. The performance of the 3D printed catalysts has been compared to their conventional analogues, packed beds of pellets and powder. The physicochemical properties of the 3D printed catalysts were investigated using scanning electron microscopy, nitrogen adsorption and X-ray diffraction (XRD). Performance and durability tests of the 3D printed catalysts were conducted in the laboratory and in a miniplant under real reaction conditions. In addition, synchrotron-based X-ray diffraction computed tomography technique (XRD-CT) was employed to obtain cross sectional maps at three different positions selected within the 3D printed catalyst body during the OCM reaction. The maps revealed the evolution of catalyst active phases and silica support on spatial and temporal scales within the interiors of the 3D printed catalyst under operating conditions. These results were accompanied with SEM-EDS analysis that indicated a homogeneous distribution of the active catalyst particles across the silica support.