Modifier-enhanced supercritical CO2 extraction of organic template from aluminosilicate MCM-41 materials: Effect of matrix Al/Si ratios and different modifiers

Huang, Zhen; Miao, Hui; Li, Jinghuan; Wei, Jia-lin; Kawi, Sibudjing; Lai, M.W.

doi:10.1016/j.seppur.2013.06.048

Cited by 8 publications

(8 citation statements)

References 38 publications

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“…[5,14] This is caused by the largee nergetic driving force requiredt ob reakt he organic-inorganic interfacial interaction. Therefore, several studies have used microwave [15] or other irradiation [16] and supercritical [17] or refluxing solvents [18,19] to achieve complete extraction of templates and template recycling after elution. [20] Although there have been reports of complete template elutionw ithoutt he need for such promoters, these require that the materiali sd esigned to allow for elution through the choice of template molecule, and therefore compromise materials properties compared to their parent materials.…”

Section: Introductionmentioning

confidence: 99%

An Eco‐Friendly, Tunable and Scalable Method for Producing Porous Functional Nanomaterials Designed Using Molecular Interactions

et al. 2017

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Despite significant improvements in the synthesis of templated silica materials, post‐synthesis purification remains highly expensive and renders the materials industrially unviable. In this study this issue is addressed for porous bioinspired silica by developing a rapid room‐temperature solution method for complete extraction of organic additives. Using elemental analysis and N2 and CO2 adsorption, the ability to both purify and controllably tailor the composition, porosity and surface chemistry of bioinspired silica in a single step is demonstrated. For the first time the extraction is modelled using molecular dynamics, revealing that the removal mechanism is dominated by surface‐charge interactions. This is extended to other additive chemistry, leading to a wider applicability of the method to other materials. Finally the environmental benefits of the new method are estimated and compared with previous purification techniques, demonstrating significant improvements in sustainability.

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Section: Introductionmentioning

confidence: 99%

An Eco‐Friendly, Tunable and Scalable Method for Producing Porous Functional Nanomaterials Designed Using Molecular Interactions

et al. 2017

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“…The thermogram can be decomposed in one zone of temperature for fresh MS and three zones for coked MS. Up to 100 °C, it corresponds to the thermal equilibrium of the experimental set up. In the zone A at 100–175 °C, there is a weight loss at nearly constant rate associated with an endothermic step that is attributed to water and other gaseous species physically adsorbed in the pores, as described by Huang et al …”

Section: Resultsmentioning

confidence: 87%

Identification of the coke deposited on 13X industrial zeolite molecular sieves during mercaptan removal process

Asl

Sargolzaei

Moosavi

2015

Asia-Pacific J Chem Eng

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Industrial Z10-13X zeolite was deactivated by coking during the sequenced pressure and temperature swing mercaptan removal unit at the conditions of 40°C and 68 bar in adsorption mode and 300°C and 8 bar in regeneration mode. In this study, detailed coke features inside industrial molecular sieves, in terms of molecular structure and also some other brief properties, have been obtained for the first time by combining numerous techniques including gas chromatography coupled with mass spectrometry, thermogravimetric analysis, Brunauer-Emmett-Teller analysis, energy-dispersive X-ray spectroscopy, X-Ray diffraction pattern, and also CO 2 and N 2 adsorption/desorption isotherms of fresh and coked molecular sieves. The coke species were identified and classified into more than 40 different components following their alkylation and cyclization mechanisms. The coke includes polyaromatic hydrocarbons, and it was much alkylated especially with methyl and ethyl fragments. It is mainly compounded of derivatives of benzene located within the zeolite pore, which could grow into polyaromatic compounds constituted up to four aromatic rings with different guest polar elements.

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“…The adsorption capacity of MCM-41 exhibits a tendency opposite to that of the Si/Al ratio for H-ZSM-5, i.e., MCM-41-AS shows a higher SP time and a higher saturation adsorption capacity for mesitylene between the two MCM-41 adsorbents. This result is related to the fact that MCM-41-AS exhibits a larger surface area and higher adsorption heat toward mesitylene compared with those of MCM-41-20 (Huang et al, 2013;Simon-Masseron et al, 2007). In addition, a high Si/Al ratio decreases the number of Lewis acid sites on the adsorbent surface, leading to a high affinity toward mesitylene (Kosslick et al, 1990;Souza et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

Adsorption of mesitylene via mesoporous adsorbents

Nien

Chang²,

Chang

2017

Journal of the Air & Waste Management Association

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This study aims to improve the performance of adsorbent for mesitylene, which is typically applied in the spray-coating industry. The zeolite MCM-41-AS is selected as a candidate for the investigation. Experimental results reveal that MCM-41-AS exhibits a good adsorption capacity for mesitylene and that it can be integrated with H-ZSM-5-25 for the simultaneous adsorption of mesitylene and toluene.

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Modifier-enhanced supercritical CO2 extraction of organic template from aluminosilicate MCM-41 materials: Effect of matrix Al/Si ratios and different modifiers

Cited by 8 publications

References 38 publications

An Eco‐Friendly, Tunable and Scalable Method for Producing Porous Functional Nanomaterials Designed Using Molecular Interactions

An Eco‐Friendly, Tunable and Scalable Method for Producing Porous Functional Nanomaterials Designed Using Molecular Interactions

Identification of the coke deposited on 13X industrial zeolite molecular sieves during mercaptan removal process

Adsorption of mesitylene via mesoporous adsorbents

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