Technological Applications of Honeycomb Monoliths in Environmental Processes: A review

Hosseini, Soraya; Moghaddas, Houyar; Soltani, Salman Masoudi; Kheawhom, Soorathep

doi:10.1016/j.psep.2019.11.020

Cited by 53 publications

(33 citation statements)

References 123 publications

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“…For the considered channel shape, it is possible to fully characterize the monoliths by two key parameters, namely the "CPSI", i.e. the number of channels per square inch, and the open-frontal area (OFA), that is the ratio between the area available for gas flow and the whole cross section of the monolith (Hosseini et al, 2020). Typically, CPSI varies between 100 and 1,200, while the void fraction ranges from 0.5 to 0.9.…”

Section: Honeycomb Monolithsmentioning

confidence: 99%

Recent Advances in the Development of Highly Conductive Structured Supports for the Intensification of Non-adiabatic Gas-Solid Catalytic Processes: The Methane Steam Reforming Case Study

et al. 2022

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Structured catalysts are strong candidates for the intensification of non-adiabatic gas-solid catalytic processes thanks to their superior heat and mass transfer properties combined with low pressure drops. In the past two decades, different types of substrates have been proposed, including honeycomb monoliths, open-cell foams and, more recently, periodic open cellular structures produced by additive manufacturing methods. Among others, thermally conductive metallic cellular substrates have been extensively tested in heat-transfer limited exo- or endo-thermic processes in tubular reactors, demonstrating significant potential for process intensification. The catalytic activation of these geometries is critical: on one hand, these structures can be washcoated with a thin layer of catalytic active phase, but the resulting catalyst inventory is limited. More recently, an alternative approach has been proposed, which relies on packing the cavities of the metallic matrix with catalyst pellets. In this paper, an up-to-date overview of the aforementioned topics will be provided. After a brief introduction concerning the concept of structured catalysts based on highly conductive supports, specific attention will be devoted to the most recent advances in their manufacturing and in their catalytic activation. Finally, the application to the methane steam reforming process will be presented as a relevant case study of process intensification. The results from a comparison of three different reactor layouts (i.e. conventional packed bed, washcoated copper foams and packed copper foams) will highlight the benefits for the overall reformer performance resulting from the adoption of highly conductive structured internals.

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Section: Honeycomb Monolithsmentioning

confidence: 99%

Recent Advances in the Development of Highly Conductive Structured Supports for the Intensification of Non-adiabatic Gas-Solid Catalytic Processes: The Methane Steam Reforming Case Study

et al. 2022

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“…Monolithic catalysts play a key role for automotive exhaust control, selective catalytic reduction of NOx in flue gases and oxidative destruction of volatile organic compounds (VOCs) generated by industry or by incineration sources [1][2][3][4][5]. Selective catalytic reduction (SCR) is a widely used technology for the removal of NOx and VOCs from mobile and stationary emission sources [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Commercially employed catalysts in SCR-DeNOx technology are usually a homogeneous mixture of titanium dioxide (in the anatase form), vanadium pentoxide and tungsten trioxide or molybdenum trioxide [2,4,7,[11][12][13]. Monolithic catalysts offer a high specific geometric surface area and a low pressure drop, for use at high space velocities [4,5,13,14]. Considerable effort has been made to develop the SCR-DeNOx process for simultaneous removal of NOx and dioxine [1,7,9,[15][16][17] as well as VOC pollutants in flue gases using commercial V2O5-WO3/TiO2 catalyst [6,7,[18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…The catalysts may be applied in a monolithic form. Usually, the monolithic catalysts applied for this purpose have a honeycomb-like shape with parallel straight channels for the flow of the gas phase [4,5,12,22].…”

Section: Introductionmentioning

confidence: 99%

“…The monolithic configuration is preferred with respect to the conventional packed bed because of the following advantages: (1) lower pressure drop especially under high gas throughputs; (2) reduction of external mass transfer and elimination of internal diffusion limitations when thin walls are used; (3) lower axial dispersion and back-mixing, and therefore high product selectivity; (4) larger specific geometric catalyst surface area; (5) uniform distribution of flow gas; (6) reduction of fouling and plugging, and thus extended catalyst lifetime; (7) easy scale-up [4,5,[25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Modelling Approach of the Catalytic Oxidation of Volatile Organic Compounds in the SCR-DeNOx Monolithic Reactor

Lazar¹,

Koeser²,

Fechete³

et al. 2020

Rev. Chim.

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Monolithic reactors play an important role in the integrated approach to environmental protection, especially in air pollution abatement. Mathematical modelling of catalytic reactors has become a key procedure in the design, development and optimisation of many industrial processes. The objective of this study was the modelling and simulation of the catalytic oxidation of volatile organic compounds by a commercial V2O5-WO3/TiO2 honeycomb catalyst, specific for the SCR-DeNOx process in high-dust flue gases from stationary incineration. The mathematical model is developed for the numerical simulation of a tubular plug flow reactor, using mass balance equation to predict results for benzene conversion under isothermal conditions.

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Honeycomb‐based heterostructures: An emerging platform for advanced energy applications: A review on energy systems

Sajjad

2021

Electrochemical Science Adv

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Due to their promising properties such as low corrosion resistance, excellent strength, high-temperature operation, simple formability and machining, and, most importantly, cost-effectiveness in the industry, honeycomb-based heterostructures have been widely used as energy storage and conversion systems for decades. Despite their low density, honeycomb structures also have strong out-of-plane compression and shear properties, resulting in very high unique strengths. The honeycomb-based molded structure, which was inspired by bee honeycombs and provides a material with low density and high out-of-plane compression and shear properties, has found widespread use and now plays a critical role in energy conversion and storage technologies such as lithium-ion batteries, solar cells, and supercapacitors. These materials have a lot of promise in terms of addressing and environmental concerns regarding power sources at a time when global energy demand is skyrocketing. In light of this, we contend in this research paper that complex honeycomb-based architectures outperform conventional simple 2D designs in a wide variety of technological applications. We also go into the different synthetic methods used to make honeycomb structures and look at how these novel materials may be used for long-term electrochemical energy transfer and storage. Finally, the current challenges and opportunities for the construction of honeycomb systems are discussed, as well as new research directions.

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Technological Applications of Honeycomb Monoliths in Environmental Processes: A review

Cited by 53 publications

References 123 publications

Recent Advances in the Development of Highly Conductive Structured Supports for the Intensification of Non-adiabatic Gas-Solid Catalytic Processes: The Methane Steam Reforming Case Study

Recent Advances in the Development of Highly Conductive Structured Supports for the Intensification of Non-adiabatic Gas-Solid Catalytic Processes: The Methane Steam Reforming Case Study

A Modelling Approach of the Catalytic Oxidation of Volatile Organic Compounds in the SCR-DeNOx Monolithic Reactor

Honeycomb‐based heterostructures: An emerging platform for advanced energy applications: A review on energy systems

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