Additive Manufactured open cell polyhedral structures as substrates for automotive catalysts

Papetti, Viola; Eggenschwiler, Panayotis Dimopoulos; Torre, Augusto Della; Lucci, Francesco; Ortona, Alberto; Montenegro, Gianluca

doi:10.1016/j.ijheatmasstransfer.2018.06.061

Cited by 56 publications

(70 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In process engineering, the new capabilities of additive manufacturing have been already investigated in former studies. Especially, periodic open‐cell structures (POCS), which are a subtype class of additively manufactured lattice structures (AMLS) that in contrast can also be designed aperiodically or fractally, are the object of various research . In the following, a literature survey will be given, stating also the advantage of the used geometry design in this work considering past research in this field.…”

Section: State‐of‐the‐art: Influence Of Additively Manufactured Strucmentioning

confidence: 99%

SMART‐Reactors: Tailoring Gas Holdup Distribution by Additively Manufactured Lattice Structures

et al. 2020

View full text Add to dashboard Cite

In chemical process engineering, fast gas‐liquid reactions often suffer from an inefficient distribution of gas and therefore mixing and mass transfer performance. This study deals with the possibility of influencing the local gas holdup and bubble size distribution in a gas‐liquid process using additively manufactured lattice structures (AMLS). The used measuring technique to study bubble size, velocity, and the local gas holdup is a photo‐optical needle probe. By using AMLS, a significant radial homogenization of the local gas holdup and the mean bubble size is achieved. Furthermore, it can be demonstrated that the bubble size can be tailored by the geometry of the inserted structure. It is illustrated that the mean bubble velocities are lowered within the lattice resulting in a higher residence time of the dispersed phase with an impact on the mass transfer performance within the AMLS.

show abstract

Section: State‐of‐the‐art: Influence Of Additively Manufactured Strucmentioning

confidence: 99%

SMART‐Reactors: Tailoring Gas Holdup Distribution by Additively Manufactured Lattice Structures

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In particular, the interest is progressively shifting towards the adoption generic Periodic Open Cell Structures (POCS), which have morphology and properties similar to open-cell foams but are arbitrarily designed with CAD tools and can be manufactured with ALM, allowing for an extreme flexibility in the optimization at both the micro-scale and the macro-scale of the device. Recent examples of application in the field of the catalyst substrate design and application to engine ATS are reported in [5,6].…”

Section: Introductionmentioning

confidence: 99%

An appraisal of the application of open-cell foams in automotive SCR systems

et al. 2020

View full text Add to dashboard Cite

This work aims to investigate the possibility to apply open-cell foams as catalytic substrates in SCR systems for Diesel engines, as a replacement of traditional honeycombs. In the literature, many studies compare the performance of foams and honeycombs as catalytic substrates, showing, in general, a better mass transfer behavior in foams, compensated on the other hand by a higher pressure drop. In this work, we consider the low-pressure injection of Ad-Blue and we evaluate the performance of the open-cell foam in enhancing the mixing and the evaporation of the spray. A Eulerian-Lagrangian CFD model has been adopted to simulate the spray evolution and its interaction with the microstructure of the open-cell foam. The model has been applied to evaluate the spray evaporation and the uniformity of the ammonia distribution in different sections of the substrate. Different operating conditions were tested comparing substrates with different geometrical properties. The results of this preliminary analysis can be regarded as promising, showing the capability of the foam to enhance the mixing of the spray and to achieve a uniform distribution of the ammonia over all the catalyst substrate.

show abstract

“…Various types of the structured catalysts have been studied (Fukahori et al, 2008;Tronconi et al, 2014;Papetti et al, 2018). e most typical structured catalysts are the monolith-type catalysts.…”

Section: Introductionmentioning

confidence: 99%

Proposal of Index for Reaction Improvement Using Structured Catalyst

Sasaki

Sakurai

2020

J. Chem. Eng. Japan

View full text Add to dashboard Cite

Micro-partition (MP; supplied by Nano Cube Japan Co., Ltd.) which is commercially available as a heat sink for precision electronic parts (and generally not as a catalyst support), was adopted as a structured catalyst support. The MP was made from aluminum; it was converted into an alumite catalyst as structured catalyst and applied for a gas-solid catalytic reaction. The MP has micro ns and holes; therefore, the reactivity was expected to improve because the reactant uid would be disarranged. In this research, we linked the disarrangement of the uid with the reactivity, analyzed the ow state of the reactants in detail, and evaluated its e ect on the reactivity. Experiments and a three-dimensional simulation were carried out to investigate the relationship between the structure and reactivity. Steam reforming of methanol was adopted as the model reaction. When the structured catalyst was used, the conversion increased by 80% at 553 K compared with that of a non-characteristic structured catalyst plate, and it was implied that the improvement in reactivity was better at lower temperature. The characteristic structure of the MP, not only the ns but also the holes signi cantly improved the reactivity. An analysis of the reaction rate showed that the contact frequency between the reactants and the catalyst increased. Furthermore, an index to evaluate the promotion of mass transfer was introduced when analyzing the mass transfer around the catalyst using dynamics simulation. The simulation showed that the structure promoted the mass transfer by convection, and a similar trend as the experiments was observed; the e ect of the structured catalyst was larger at lower temperature condition. The factor of the reactivity improvement by the structured catalyst became clear from the results of the experiments and simulation.

show abstract

Additive Manufactured open cell polyhedral structures as substrates for automotive catalysts

Cited by 56 publications

References 43 publications

SMART‐Reactors: Tailoring Gas Holdup Distribution by Additively Manufactured Lattice Structures

SMART‐Reactors: Tailoring Gas Holdup Distribution by Additively Manufactured Lattice Structures

An appraisal of the application of open-cell foams in automotive SCR systems

Proposal of Index for Reaction Improvement Using Structured Catalyst

Contact Info

Product

Resources

About