Monolith reactors

Lopes, José; Rodrigues, Alírio E.

doi:10.1002/9781119248491.ch8

Cited by 3 publications

(3 citation statements)

References 122 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Receiving particular attention in the catalytic reactor research was then the non-uniformity of temperatures in individual parallel passages. Examples are in References [9][10][11][12][13]. The temperature differences are due to the required total matrix face area F being substantially larger than the exhaust pipe cross section that brings the gas to the matrix.…”

Section: Cold Flowfield Inside the Catalytic Reactormentioning

confidence: 99%

Aerodynamics of Monolithic Matrices for Supporting Solid Reactant or Catalyst

Tesař

2019

Energies

View full text Add to dashboard Cite

Heterogeneous solid/fluid chemical reactions—as well as reactions dependent on solid catalysts—require spreading the active solid substance on the largest accessible area. The solution is a thin layer covering as much as possible convoluted surface of an inert support. This is nowadays the internal surface of narrow parallel passages. The supporting body is usually ceramic, its passages now mostly of square cross section. Reliable detailed knowledge of pressure drop across the set of passages has to be available, especially for flow control based on fluid property changes (e.g., with temperature or fluid composition). This paper presents results of laboratory measurements as well as numerical flowfield computations of the passage flows, with discovered universal law.

show abstract

Section: Cold Flowfield Inside the Catalytic Reactormentioning

confidence: 99%

Aerodynamics of Monolithic Matrices for Supporting Solid Reactant or Catalyst

Tesař

2019

Energies

View full text Add to dashboard Cite

show abstract

“…Such a monolith, exhibiting uniformity of channel size and adsorbent loading has been referred to as an 'ideal' monolith in this article. An ideal monolith may be modelled as a single representative channel, thereby reducing the computation effort significantly (Lopes and Rodrigues, 2016). However, the assumption of an ideal monolith may be invalid if there exists a significant non-uniformity in channel size and adsorbent loading.…”

Section: Introductionmentioning

confidence: 99%

“…Such a monolith, exhibiting a uniformity of channel size and adsorbent loading, can be referred to as an “ideal” monolith (IM). An IM may be modeled as a single representative channel, thereby reducing the computational effort significantly …”

Section: Introductionmentioning

confidence: 99%

Combining the Nonuniform Structure and Flow Maldistribution for the Accurate Prediction of the Process Performance of Monolithic Adsorbent Systems

Sharma

Mennitto

Friedrich

et al. 2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Monolithic adsorbents are used to achieve the intensification of adsorption-based separation processes. The ideal monolith assumption, wherein the monolith is assumed to be composed of identical channels, is often made while modelling monolith adsorbent columns. However, the monolith production processes invariably introduce certain non-uniformities in channel size and adsorbent loadings. Such non-uniformities tend to broaden the breakthrough curve. The ideal monolith assumption, therefore, results in a sharper concentration front than what is experimentally observed. The mass transfer coefficient is often artificially reduced to match the broad experimental breakthrough curve. At the same time, to reasonably predict the fullcycle performance, the true mass transfer coefficient has to be used; this implies that different intrinsic parameters are needed to explain the same physical process. The present article aims to addresses this inherent inconsistency by taking into account the structural non-uniformities. A monolith consisting of corrugated channels has been used as a case study to illustrate this approach. All the monolith channels have been assumed to be grouped into different 'types', with each type corresponding to a particular channel size and adsorbent loading; this implies that the overall breakthrough curve has been assumed to be a combination of several breakthrough curves. By taking into account the structural non-uniformities and flow maldistribution, it has been shown that the true mass transfer coefficient can reasonably predict both the breakthrough and full-cycle performance. For the investigated case study, the fullcycle predictions via this approach were within ±2.5 % of the experimental observations. Additionally, by accounting for the additional dispersion caused by channel non-uniformities, predictions are closer to the experimental observations at high throughput, as compared to the ideal monolith approach with true mass transfer coefficient. Since the primary application of monolith columns is in the intensification of adsorption processes, it becomes imperative to account for channel non-uniformities.

show abstract

Liquid–Liquid Processes: Mass Transfer Processes and Chemical Reactions

Kockmann

Agar

2022

Multiphase Flows for Process Industries

View full text Add to dashboard Cite

Monolith reactors

Cited by 3 publications

References 122 publications

Aerodynamics of Monolithic Matrices for Supporting Solid Reactant or Catalyst

Aerodynamics of Monolithic Matrices for Supporting Solid Reactant or Catalyst

Combining the Nonuniform Structure and Flow Maldistribution for the Accurate Prediction of the Process Performance of Monolithic Adsorbent Systems

Liquid–Liquid Processes: Mass Transfer Processes and Chemical Reactions

Contact Info

Product

Resources

About