4-Scale model for macromolecule conversion over mesoporous and hierarchical alumina catalysts

Пархомчук, Е. В.; Bazaikin, Y.; Malkovich, Evgeny; Лысиков, А. И.; Vorobieva, E.E.; Федотов, К. В.; Kleymenov, A. V.

doi:10.1016/j.cej.2020.126551

Cited by 8 publications

(5 citation statements)

References 16 publications

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“…Among the array of catalyst modification strategies, the development of mesoporous materials has been validated as highly effective in enhancing catalyst performance and coking resistance. [47][48][49] The introduction of mesopores could not only expose more active sites to reactants and reduce the diffusion resistance, but also improve catalyst deactivation caused by pore blockage and extend the catalyst lifespan, which demonstrate promising prospects for industrial applications. However, excessively large pore dimensions are undesirable as they may cause a decrease in surface area and mechanical strength.…”

Section: Catalytic Ammoniation Of Cpl To Acnmentioning

confidence: 99%

Producing hexamethylenediamine from caprolactam via 6-aminocapronitrile: a green production technology of the monomer of nylon-66

Geng,

Li,

Zhang

et al. 2024

Green Chem.

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Section: Catalytic Ammoniation Of Cpl To Acnmentioning

confidence: 99%

Producing hexamethylenediamine from caprolactam via 6-aminocapronitrile: a green production technology of the monomer of nylon-66

Geng,

Li,

Zhang

et al. 2024

Green Chem.

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“…Hierarchical porous alumina ceramics have attracted lots of attentions due to unique multifunctionality and mechanical efficiency for wide application in catalysts, 1 filters, 2 bioreactors, 3 bone substitutes, 4 thermal insulation materials, and so on. 5 As is well-known, the performance of hierarchical porous ceramics is mainly determined by pore size, pore orientation, and open/closed porosity.…”

Section: Introductionmentioning

confidence: 99%

“…Hierarchical porous alumina ceramics have attracted lots of attentions due to unique multifunctionality and mechanical efficiency for wide application in catalysts, filters, bioreactors, bone substitutes, thermal insulation materials, and so on . As is well-known, the performance of hierarchical porous ceramics is mainly determined by pore size, pore orientation, and open/closed porosity. − Some methods have been developed to control the preparation of hierarchical porous alumina ceramics, such as bulk casting with capillary suspensions, direct foaming, , emulsion, − and sacrificial template methods .…”

Section: Introductionmentioning

confidence: 99%

Tunable Size of Hierarchically Porous Alumina Ceramics Based on DIW 3D Printing Supramolecular Gel

Yang

Guan

Zhen

et al. 2022

ACS Appl. Mater. Interfaces

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A new three-dimensional (3D) printing gel is developed to construct hierarchically porous ceramics with adjustable millimeter-, micrometer-, and nanometer-scale size for application in thermal management. Not only does the gel based on supramolecular micelles exhibit excellent DIW 3D printability but also the supramolecular micelles act as templates that can precisely control the structure of micrometer-scale pores. The effect of millimeter-and μmicrometer-scale size on properties of porous ceramics is investigated in detail. The 3D-printed ceramic foam with millimeter-scale pores and smaller micrometer-scale pores shows better thermal insulation and lower compressive strength. For the thermal insulation, the local temperature of a chip exposed to contact heat is only 34.2 °C in the presence of a printed foam cap with a pore size of 41.5 μm, while the local temperature is 54.8 °C in the absence of the printed foam cap. The study provides a new method to construct hierarchically porous alumina ceramics with precisely tunable size, avoiding the issues of subtractive manufacturing and opening up new applications in portable devices or consumer electronics.

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“…The authors showed that both diffusion limitations as well as adsorption are highly relevant factors to consider in catalyst for heavy oil hydrotreatment. (Parkhomchuk et al, 2021) investigated a multi-scale model for the conversion of macromolecules in a hierarchical alumina catalyst. In this study and in a similar work by (Semeykina, Malkovich, Bazaikin, Lysikov, & Parkhomchuk, 2018) the authors considered theoretical macromolecules of 10nm in size, which is in line with the size of asphaltenes.…”

Section: Introductionmentioning

confidence: 99%

“…In this study and in a similar work by (Semeykina, Malkovich, Bazaikin, Lysikov, & Parkhomchuk, 2018) the authors considered theoretical macromolecules of 10nm in size, which is in line with the size of asphaltenes. (Parkhomchuk et al, 2021) recommended pore sizes >70nm for conversion with this substrate.…”

Section: Introductionmentioning

confidence: 99%

Greener starch oxidation : Exploring challenges in designing catalytic processes for polydisperse feedstocks

Hoogstad

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Oxidised starch is currently produced from native starch using sodium hypochlorite as oxidising agent. The use of hypochlorite has undesired side reactions and produces stoichiometric amounts of waste (salt), thus alternative oxidation methods are desired.In this study, the potential of two catalysed starch oxidation methods to reduce the environmental impact (EI) of oxidised starch production are assessed. We compared the EI of oxidation with molecular oxygen (heterogeneously catalysed) and hydrogen peroxide (homogeneously catalysed) to hypochlorite oxidation through life cycle assessment. The results confirm that hypochlorite oxidation is the main environmental hotspot in the current process of oxidised starch production, and that both hydroperoxide oxidation and molecular oxygen oxidation can significantly lower the EI of the process. The impact reduction is most significant in the categories of freshwater eutrophication (~67%), ozone depletion (~66%), climate change (35-60%) and resource use (40%-78%) for peroxide and molecular oxygen oxidation respectively.

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4-Scale model for macromolecule conversion over mesoporous and hierarchical alumina catalysts

Cited by 8 publications

References 16 publications

Producing hexamethylenediamine from caprolactam via 6-aminocapronitrile: a green production technology of the monomer of nylon-66

Producing hexamethylenediamine from caprolactam via 6-aminocapronitrile: a green production technology of the monomer of nylon-66

Tunable Size of Hierarchically Porous Alumina Ceramics Based on DIW 3D Printing Supramolecular Gel

Greener starch oxidation : Exploring challenges in designing catalytic processes for polydisperse feedstocks

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