Preparation of γ-Al2O3/α-Al2O3 ceramic foams as catalyst carriers via the replica technique

Шумилов, В. М.; Кирилин, А. Д.; Tokarev, A. V.; Boden, Stephan; Schubert, Markus; Hampel, Uwe; Hupa, Leena; Salmi, Tapio; Murzin, Dmitry Yu.

doi:10.1016/j.cattod.2020.09.019

Cited by 34 publications

(11 citation statements)

References 22 publications

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“…Furthermore, the addition of TA increased the viscosity of the slurry, and thus further promoted the aggregation of particles, which reduced the risk of bubbles merging with each other, and resulted in a reduced pore size and more regular pore structure (Figure 5). BPO 4 ceramic foams was in the range of 84.2%−90.4%, the compressive strength and bulk density were in the range of .12−.72 MPa, and .3−.48 g/cm 3 , respectively. As shown in Figure 7(A-C), when the FA content increased from .3 wt% to .9 wt%, the bulk density and compressive strength of the ceramic foams decreased as the total porosity increased.…”

Section: Microstructurementioning

confidence: 99%

Fabrication of novel BPO₄ ceramic foams using the combination of the direct foaming method and freeze‐drying techniques

et al. 2023

Int J Applied Ceramic Tech

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In this study, ammonium phosphate monobasic and boric acid were used as the primary starting materials to produce BPO4 powder by solid‐state reaction. Using BPO4 powders as the main raw material, BPO4 ceramic foams were prepared for the first time using the direct foaming method and freeze‐drying techniques. The effects of the additive content and solid loading on the slurry's rheological behavior were investigated, and the microstructures and properties of the as‐prepared BPO4 ceramic foams were examined. The results reveal that the porosity of the BPO4 ceramic foams synthesized at 1223 K ranged from 84.2% to 90.4%, the compressive strength ranged from .12 MPa to .72 MPa, and the thermal conductivity ranged from .32 W/(m·K) to .74 W/(m·K) (298 K). The findings of this study have great significance for the development of new thermal insulation ceramic materials.

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Section: Microstructurementioning

confidence: 99%

Fabrication of novel BPO₄ ceramic foams using the combination of the direct foaming method and freeze‐drying techniques

et al. 2023

Int J Applied Ceramic Tech

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“…In addition to the thermodynamically stable alpha alumina (α-Al 2 O 3 ), alumina exists in various metastable polymorphs, including γ-Al 2 O 3 . While α-Al 2 O 3 has a low surface area, γ-Al 2 O 3 is more porous (surface area of 200–240 m 2 /g) and thus possess the potential to produce catalysts by removing metals from water …”

Section: Introductionmentioning

confidence: 99%

“…23 While α-Al 2 O 3 has a low surface area, γ-Al 2 O 3 is more porous (surface area of 200−240 m 2 /g) and thus possess the potential to produce catalysts by removing metals from water. 24 In this study, we explored the feasibility of γ-Al 2 O 3 to beneficially remove metal ions that pose potential human or ecological health concerns while simultaneously producing a value-added byproduct suitable for industrial-grade catalysis. First, the ability of γ-Al 2 O 3 to remove copper ions from water was evaluated and compared against α-Al 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

Recovery of Metal Ions from Aqueous Solutions by γ-Alumina Creates Value-Added Catalyst Products

et al. 2023

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Mining and extracting metals from hard rock adversely impact the environment. These impacts could be mitigated by capturing dissolved metals from water (i.e., mine runoff, industrial wastewaters, or even tap water) and converting the metals to products with potential economic benefits (i.e., upcycled into high-value products). We sought to identify a sorbent that can remove dissolved metals from water and in the process of this low-temperature surface adsorption create a catalytic material of potential economic value. We discovered that γ-aluminum oxide (γ-Al 2 O 3 ) can produce a reactive catalyst after removing metal ions (copper (Cu), palladium (Pd), nickel (Ni), and cobalt (Co)) from water, even for dissolved metals at environmentally relevant concentrations. The resulting metal-coated γ-Al 2 O 3 behaved, comparable to high-temperature produced catalysts, as a mono-or bimetallic catalyst capable of oxidizing or reducing pollutants (methylene blue, 4-nitrophenol, nitrite, and nitrate). Mono-or bimetallic catalysts synthesized from tap water with metal ions present efficiently oxidized methylene blue (by Cu/γ-Al 2 O 3 ) or reduced nitrate (by Pd−Cu/γ-Al 2 O 3 ) into less harmful species (i.e., ammonium and dinitrogen gas). Results demonstrated the versatile use of γ-Al 2 O 3 that removes metal ions from water (i.e., water purification) and produces a valuable γ-Al 2 O 3 -based byproduct with proven catalytic reactivity (i.e., catalyst production) and commercial markets.

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“…The recent development of new reactor and catalyst structures, such as monoliths, solid foams, microreactors and 3D-printed structures has caused a renaissance of this subfield of chemical reaction engineering, because it is absolutely necessary to know the flow pattern and RTD for each new reactor and catalyst structure, in order to progress successfully with rational modelling of reaction kinetics, transport phenomena and flow pattern (Stankiewicz and Moulijn 2000;Hessel et al, 2004;Mastroianni et al, 2022;Shumilov et al, 2022). Besides the classical experiments with pulse and step wise added inert tracers, modern tomographic methods are of great help in research and development of new reactor systems.…”

Section: Introductionmentioning

confidence: 99%

Experimental determination and mathematical modelling of residence time distributions by using pieces of urban art

et al. 2022

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Residence time distribution (RTD) has a very high impact on the performance of a chemical reactor. The development of new reactor and catalyst structures has increased the importance of deep knowledge in theories of RTDs and good experimental practice in measuring RTDs in real systems. Therefore, RTD studies are included in chemical engineering education all over the world. This work demonstrates how RTDs can be measured by using urban pieces of art. Impulse experiments with an inert tracer (NaCl) were conducted in a marvelous modern artwork, ‘Flow of time’ in Turku/Åbo. The results were successfully interpreted with the classical laminar flow model. The application of the methodology in historical university cities is suggested.

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Preparation of γ-Al2O3/α-Al2O3 ceramic foams as catalyst carriers via the replica technique

Cited by 34 publications

References 22 publications

Fabrication of novel BPO₄ ceramic foams using the combination of the direct foaming method and freeze‐drying techniques

Fabrication of novel BPO₄ ceramic foams using the combination of the direct foaming method and freeze‐drying techniques

Recovery of Metal Ions from Aqueous Solutions by γ-Alumina Creates Value-Added Catalyst Products

Experimental determination and mathematical modelling of residence time distributions by using pieces of urban art

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Preparation of γ-Al2O3/α-Al2O3 ceramic foams as catalyst carriers via the replica technique

Cited by 34 publications

References 22 publications

Fabrication of novel BPO4 ceramic foams using the combination of the direct foaming method and freeze‐drying techniques

Fabrication of novel BPO4 ceramic foams using the combination of the direct foaming method and freeze‐drying techniques

Recovery of Metal Ions from Aqueous Solutions by γ-Alumina Creates Value-Added Catalyst Products

Experimental determination and mathematical modelling of residence time distributions by using pieces of urban art

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Fabrication of novel BPO₄ ceramic foams using the combination of the direct foaming method and freeze‐drying techniques

Fabrication of novel BPO₄ ceramic foams using the combination of the direct foaming method and freeze‐drying techniques