Design of Monolithic Supports by 3D Printing for Its Application in the Preferential Oxidation of CO (CO-PrOx)

Abstract

Honeycomb-shaped cordierite monoliths are widely used as supports for a great number of industrial applications. However, the high manufacturing costs of cordierite monoliths only justifies its use for high temperatures and aggressive chemical environments, demanding applications where the economic benefit obtained exceeds the manufacturing costs. For low demanding applications, such as the preferential oxidation of CO (CO-PrOx), alternative materials can be proposed in order to reduce manufacturing costs. Polymeric monoliths would be an interesting low-cost alternative, however, the handicap

Mathematical Modeling of Preferential CO Oxidation Reactions under Advection–Diffusion Conditions in a 3D-Printed Reactive Monolith

“…The mathematical model was validated by fitting the experimental CO-PROX results of Chaparro-Garnica et al, which are presented in Figure . The CO selectivity and conversion percentage as a function of temperature are plotted.…”

“…Therefore, once reaction kinetics is known, the specific support for that reaction could be designed to allow maximum performance of the catalyst. The current work is a continuation of our previous work reported elsewhere, , devoted to the design of 3D-printed monoliths for the CO-PROX reaction. In a first stage, 3D-printing was used to prepare polymer-based monoliths for this reaction, and a method to load the active phase on a polymer substrate was developed.…”

“…The current work is a continuation of our previous work reported elsewhere, , devoted to the design of 3D-printed monoliths for the CO-PROX reaction. In a first stage, 3D-printing was used to prepare polymer-based monoliths for this reaction, and a method to load the active phase on a polymer substrate was developed. In a further step, 3D-printing was used to modify the monolith channel design, comparing a conventional honeycomb design with a nonchanneled design that cannot be prepared by conventional methods.…”

3D Printing in Heterogeneous Catalysis—The State of the Art

“…The maximum CO conversion was 97% at 150 °C (slightly lower than that of the powdered catalyst), with a temperature delay of 25 °C. After several reuse cycles, the activity of the supported catalyst increased [ 75 ].…”

Robocasting of 3D printed and sintered ceria scaffold structures with hierarchical porosity for solar thermochemical fuel production from the splitting of CO2

“…28,29 Solid 20 mol% Sm-doped ceria pellets were produced by 3D direct writing from a paraffin based slurry for solid oxide fuel cell applications (and then sintered at only 700 °C) in 2019, 30 a 10 mol% ceria-stabilised-zirconia and alumina composite biomaterial was robocast from a hydrogel in 2017, 31 and the 3D printing by stereo lithography of Al 2 O 3 with 12 mol% CeO 2 –ZrO 2 (Zr 4+ : Ce 4+ = molar ratio of 88 : 12) was reported in 2020. 32 The only reports of similar porous ceria structures are those made by the replication method on extruded polymer supports for CSP applications in 2019, 33 and 3D printed polymer scaffolds in 2021, 34 ceria coated on 3D printed polymer supports/structures/scaffolds, 35,36 CuO/CeO 2 catalysts coated on 3D printed polymer scaffolds, 37 Ni/CeO 2 –ZrO 2 powder deposited on 3D printed stainless-steel honeycomb monoliths, 38 CeO 2 –ZrO 2 –La 2 O 3 nanopowder catalysts supported on robocast graphene oxide scaffolds, 39 3D printed ceria/silica microsphere/boehmite (γ-AlO(OH)) particle-stabilised foams by moulding and direct ink writing, 40 and robocast ceria coated with a nickel catalyst. 41 All such 3D printed ceramics need to be sintered after manufacture to produce the ceria ceramic, particularly if destined for high temperature use – in nearly all of the cases above, the ceria was used unsintered as a catalyst.…”