Strongly acidic mesoporous aluminosilicates prepared via hydrothermal restructuring of a crystalline layered silicate

Alam, Nurul; Mokaya, Robert

doi:10.1039/c5ta00548e

Cited by 10 publications

(3 citation statements)

References 97 publications

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“…In the sample treated at the highest temperature (Hal-SWCNT 96:4-550), mesopores and macropores were mainly revealed. This can be explained by high temperatures that destroyed aluminosilicates resulting in the collapse of micropores, which corresponds with abundant pores [45].…”

Section: Resultsmentioning

confidence: 99%

Preparation, Characterization and Adsorption Potential of Grainy Halloysite-CNT Composites for Anthracene Removal from Aqueous Solution

et al. 2019

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Grainy Hal-CNT composites were prepared from powder halloysite nanoclay (Hal) and carbon nanotubes (CNTs). The effect of the amount and type of CNTs, as well as calcination temperature on morphology and properties of Hal-CNT composites and their adsorption capacity of anthracene (ANT), were studied. The surface topography of granules was heterogenous, with cracks and channels created during granulation of powder clay and CNTs. In FTIR, spectra were exhibited only in the bands arising from halloysite, due to its dominance in the granules. The increase in the heating temperature to 550 °C resulted in mesoporosity/macroporosity of the granules, the lowest specific surface area (SSA) and poorest adsorption potential. Overall, SSA of all Hal-CNT composites were higher than raw Hal, and by itself, heated halloysite. The larger amount of CNTs enhanced adsorption kinetics due to the more external adsorption sites. The equilibrium was established with the contact time of approximately 30 min for the sample Hal-SWCNT 85:15, while the samples with loading 96:4, it was 60–90 min. Adsorption isotherms for ANT showed L1 type, which is representative for the sorbents with limited adsorption capacity. The Langmuir model described the adsorption process, suggesting a monolayer covering. The sample Hal-SWCNT 85:15 exhibited the highest adsorption capacity of ANT, due to its highest SSA and microporous character.

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Section: Resultsmentioning

confidence: 99%

Preparation, Characterization and Adsorption Potential of Grainy Halloysite-CNT Composites for Anthracene Removal from Aqueous Solution

et al. 2019

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“…Finally, as expected, all synthesized catalysts showed similar behavior after thermal gravimetric analysis (see Figure 3c). A mass loss of around 10% above 200 • C is observed, which can be related to the dehydroxylation of the aluminosilicate framework [29]. Supporting information includes the N 2 adsorption-desorption isotherms (Figure S2), TGA (Figure S3), and FTIR spectra (Figure S4) of all catalysts.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

Chemical Recycling of Used Motor Oil by Catalytic Cracking with Metal-Doped Aluminum Silicate Catalysts

et al. 2023

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The chemical recycling of used motor oil via catalytic cracking to convert it into secondary diesel-like fuels is a sustainable and technically attractive solution for managing environmental concerns associated with traditional disposal. In this context, this study was conducted to screen basic and acidic-aluminum silicate catalysts doped with different metals, including Mg, Zn, Cu, and Ni. The catalysts were thoroughly characterized using various techniques such as N2 adsorption–desorption isotherms, FT-IR spectroscopy, and TG analysis. The liquid and gaseous products were identified using GC, and their characteristics were compared with acceptable ranges from ASTM characterization methods for diesel fuel. The results showed that metal doping improved the performance of the catalysts, resulting in higher conversion rates of up to 65%, compared to thermal (15%) and aluminum silicates (≈20%). Among all catalysts, basic aluminum silicates doped with Ni showed the best catalytic performance, with conversions and yields three times higher than aluminum silicate catalysts. These findings significantly contribute to developing efficient and eco-friendly processes for the chemical recycling of used motor oil. This study highlights the potential of basic aluminum silicates doped with Ni as a promising catalyst for catalytic cracking and encourages further research in this area.

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“…Conventional templates like tetraethylammonium hydroxide (TEAOH), [9] organic amines, [10,14] hexamethyleneimine, [16,17] alkyltrimethylammoniam halides(CnTMAX; X ) Cl or Br), [10,13] geminisurfactants type ([C n H 2n+1 N + (CH 3 ) 2 (CH 2 )sN + -(CH 3 ) 2 C m H 2m+1 ]Br 2 )(18-12-18), [11] Myristyltrimethylammonium bromide (MTMAB), [19] dodecyltrimethylammonium bromide, [13] diblock copolymer, triblock copolymer P123 (nonionic surfactant) [4,18,24] , oligomeric surfactants [4] , Rhodamine B (dye) [3] , ω-hydroxy-bolaform surfactants [15] fatty alcohol polyoxyethylene ether (PEO surfactants) [23] are used as a template. In a few synthesis methods NaOH [23] , butanol [19] and carbon black microspheres [16] is used as a co-surfactant.…”

Section: Introductionmentioning

confidence: 99%

A Green Route for Sustainable Nanoporous Solid Acid Catalyst Synthesis Using Bio Template and Analysis of Its Progressive Transformation of CO2

Thangam,

Kannan

2024

Univers. J. Green Chem.

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Green chemistry approach is a most important area in the modern chemical world. The nano (meso) porous materials have the specific application in separation, adsorption and catalysis. A green template (Egg white) is used as a bio template for the synthesis of nanoporous material to replace the hazardous templates. It is a bio-degradable template; it does not create any environmental issues. The synthesized material is characterized by various spectroscopic techniques to confirm its structural formation. Based on pore size, the catalyst named as AlSiO4-14. The synthesized catalyst (AlSiO4-14) is active at 175oC. This low temperature activity will not produce coke formation at the same time it does not require any regeneration and the catalyst is continuously active for catalytic reactions. The catalytic activity of carbon dioxide decomposition is achieved at lower temperature. The complete carbon dioxide decomposition of AlSiO4-14 is 43 % is a great impact of the material.

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Strongly acidic mesoporous aluminosilicates prepared via hydrothermal restructuring of a crystalline layered silicate

Abstract: Crystalline layered silicates may be hydrothermally restructured to generate mesostructured aluminosilicates with retained molecular ordering and strong acidity via benign template removal routes.

Cited by 10 publications

References 97 publications

Preparation, Characterization and Adsorption Potential of Grainy Halloysite-CNT Composites for Anthracene Removal from Aqueous Solution

Preparation, Characterization and Adsorption Potential of Grainy Halloysite-CNT Composites for Anthracene Removal from Aqueous Solution

Chemical Recycling of Used Motor Oil by Catalytic Cracking with Metal-Doped Aluminum Silicate Catalysts

A Green Route for Sustainable Nanoporous Solid Acid Catalyst Synthesis Using Bio Template and Analysis of Its Progressive Transformation of CO2

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