Additively manufactured geopolymer structured heterogeneous catalysts for biodiesel production

Botti, Renata; Innocentini, M. D. M.; Faleiros, Thais A.; Mello, Murilo F.; Flumignan, Danilo Luiz; Santos, Letícia Karen dos; Franchin, Giorgia; Colombo, Paolo

doi:10.1016/j.apmt.2021.101022

Cited by 13 publications

(6 citation statements)

References 23 publications

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“…The open porosity (

{O}_p

) and total porosity (

{T}_p

) of the printed Si 3 N 4 samples were measured according to the following equations 32 :

\begin{equation}\ {O}_p = \left( {1 - \frac{{{\rho }_b}}{{{\rho }_a}}} \right)\ \times 100\% \end{equation}

\begin{equation}\ {T}_p = \left( {1 - \frac{{{\rho }_b}}{{{\rho }_t}}} \right)\ \times 100\% \end{equation}

where ρ b , ρ a , and ρ t (g/cm 3 ) stand for the bulk density, apparent density, and true density, respectively.…”

Section: Methodsmentioning

confidence: 99%

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3D printing of honeycomb Si₃N₄ ceramic

Wang

et al. 2023

Int J Applied Ceramic Tech

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In this paper, a honeycomb Si3N4 ceramic was fabricated by 3D printing with a well‐preserved structure. The effects of Si3N4 content on the rheological properties of Si3N4/sol–silica ink and the printing resolution of products were investigated. The microstructure, phase composition, liner shrinkage rate, and fracture behavior of printed samples before and after sintering were systematically characterized in detail. The results showed that the modified inks had the optimized rheological properties, and the stress–shear rate curves corresponding to each slurry could be well described by Bingham and Herschel–Bulkley fluid models. The corresponding slump rates of the printed samples with different Si3N4 to sol–silica mass ratios were all lower than 4%, and the linear shrinkage rate of all of the samples after sintering was below 20%. The fracture behavior under compressive loading of the honeycomb Si3N4 ceramics tended to be non‐catastrophic fractures both before and after sintering. The compressive strengths of all of the printed samples decreased with the increase of the Si3N4 content, and the highest compressive strength of the honeycomb ceramics could reach 131.2 MPa after sintering at 1600°C, which was about 366.9% higher than that of the samples in green state prior to the sintering.

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“…The open porosity (

{O}_p

) and total porosity (

{T}_p

) of the printed Si 3 N 4 samples were measured according to the following equations 32 :

\begin{equation}\ {O}_p = \left( {1 - \frac{{{\rho }_b}}{{{\rho }_a}}} \right)\ \times 100\% \end{equation}

\begin{equation}\ {T}_p = \left( {1 - \frac{{{\rho }_b}}{{{\rho }_t}}} \right)\ \times 100\% \end{equation}

where ρ b , ρ a , and ρ t (g/cm 3 ) stand for the bulk density, apparent density, and true density, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The open porosity (𝑂 𝑝 ) and total porosity (𝑇 𝑝 ) of the printed Si 3 N 4 samples were measured according to the following equations 32 :…”

Section: Characterizationmentioning

confidence: 99%

3D printing of honeycomb Si₃N₄ ceramic

Wang

et al. 2023

Int J Applied Ceramic Tech

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“…Geopolymers have found applications in heterogeneous catalysis [31][32][33][34][35] because of the possibility of tailoring the surface composition with suitable extra-framework cations. Adsorption is the first step in heterogeneous catalysis, and hence, it is important to assess the adsorption properties of a material as a measure of its potential catalytic activity.…”

Section: Assessment Of Adsorptionmentioning

confidence: 99%

Development and Assessment of Computational Models Detailing the Influence of Extra‐Framework Cations on the Local Structure, Stability and Structure‐Property Relationships in Geopolymers

Misra

Deshpande

2023

Advcd Theory and Sims

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This study presents density functional theory based computational analysis of geopolymeric materials of varied Si:Al ratios and extra‐framework cations. Due to the absence of crystallinity and long‐range order in geopolymers, no standard molecular models are present for quantum chemical analysis of these materials. Therefore, computationally feasible molecular models conforming to experimental reports and constraints are developed that accounted for all combinatorially possible local structures in the material. The computational analysis conclusively proved the effect of Si:Al ratio and the identity of the extra‐framework cation on the stability of the material with Si:Al = 2:1 decorated with Ca2 + ions exhibiting the highest stability. No significant effect of local structure is observed on the stability of the systems. Insights into the stability and adsorption property are developed on the basis of partial charge distribution thereby providing the details on the effects of constituent elements on the structure‐property relationships in geopolymers.

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“…However, a pure geopolymer can be used effectively only for a limited number of pollutants, and the addition or/and modification with functional additives has been demonstrated to be an effective strategy to improve or endow the capacity for eliminating specific pollutants. [24][25][26][27] Geopolymers have been used as catalysts for different applications, including H 2 generation, 28 biodiesel production, 29 wastewater treatment, and gas purification for environmental management. [30][31][32] Currently, a variety of metals and their oxides are used to activate PMS, such as iron, 33,34 manganese, 35 copper, 36 etc.…”

Section: Introductionmentioning

confidence: 99%

In situ growth of CuO on porous geopolymer spheres as green catalysts for enhanced peroxymonosulfate‐activated degradation of Orange I

Li,

Wang,

Bai

et al. 2023

J Am Ceram Soc.

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In this study, in situ growth of CuO on the surface of porous geopolymer catalyst spheres (GC) was prepared through a simple method for the activation of peroxymonosulfate (PMS) to degrade Orange I (OI) in water. GC‐0.01 exhibited an excellent performance with more than 95% degradation of OI within 30 min. The effects of PMS concentrations, catalyst dosage, Cl−, HCO3−, and humic acid (HA) on OI degradation in the GC‐0.01/PMS system were systematically investigated. The study of the mechanism showed that PMS combined with the catalyst to generate complexes on the surface of the spheres, which could degrade OI through an electron transfer pathway. In addition, a variety of reactive oxygen species, mainly 1O2, were also present in the GC‐0.01/PMS system, which could also degrade OI. This work provides new insight into the application of oxide‐modified geopolymers in the activation of PMS for water purification applications.

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Additively manufactured geopolymer structured heterogeneous catalysts for biodiesel production

Cited by 13 publications

References 23 publications

3D printing of honeycomb Si₃N₄ ceramic

3D printing of honeycomb Si₃N₄ ceramic

Development and Assessment of Computational Models Detailing the Influence of Extra‐Framework Cations on the Local Structure, Stability and Structure‐Property Relationships in Geopolymers

In situ growth of CuO on porous geopolymer spheres as green catalysts for enhanced peroxymonosulfate‐activated degradation of Orange I

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Additively manufactured geopolymer structured heterogeneous catalysts for biodiesel production

Cited by 13 publications

References 23 publications

3D printing of honeycomb Si3N4 ceramic

3D printing of honeycomb Si3N4 ceramic

Development and Assessment of Computational Models Detailing the Influence of Extra‐Framework Cations on the Local Structure, Stability and Structure‐Property Relationships in Geopolymers

In situ growth of CuO on porous geopolymer spheres as green catalysts for enhanced peroxymonosulfate‐activated degradation of Orange I

Contact Info

Product

Resources

About

3D printing of honeycomb Si₃N₄ ceramic

3D printing of honeycomb Si₃N₄ ceramic