Extrusion and Characterization of High Si/Al Ratio ZSM-5 Using Silica Binder

Almeida, Ana C.; Ribeiro, Rui P.P.L.; Mota, José P. B.; Grande, Carlos A.

doi:10.3390/en13051201

Cited by 8 publications

(5 citation statements)

References 43 publications

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“…Hydrophobic zeolites are more useful for removing nonpolar and weakly polar compounds, including VMSs. For example, zeolite such as ZSM-5 with a high Si/Al ratio (200) [38] can be used simultaneously for CO 2 and H 2 O removal in the biogas upgrading process and for the removal of VMSs and H 2 S.…”

Section: Adsorption Of Vmss Using Zeolitesmentioning

confidence: 99%

Adsorptive Biogas Purification from Siloxanes—A Critical Review

Gaj

2020

Energies

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Siloxanes are among the most technologically troublesome trace compounds present in biogas. As a result of their combustion, hard-to-remove sediments are formed, blocking biogas energy processing devices and reducing the efficiency of biogas plants. The purpose of this study was to help investors and designers to choose the optimal technology for the adsorptive removal of volatile methylsiloxanes (VMSs) from biogas and to identify adsorbents worth further development. This paper critically reviews and discusses the state-of-the-art technologies for the adsorption removal of siloxanes from biogas, indicating potentially beneficial directions in their development and deficiencies in the state of knowledge. The origin of VMSs in biogas, their selected physicochemical properties, technological problems that they can cause and their typical versus limit concentrations in biogases are presented. Both the already implemented methods of adsorptive VMSs removal from landfill and sewage gases and the ones being under development are verified and systematized. The parameters and effectiveness of adsorption processes are discussed, and individual adsorbents are compared. Possible ways of regenerating spent adsorbents are evaluated and prospects for their application are assessed. Finally, zeolite-based adsorbents—which can also be used for biogas desulfurization—and adsorbents based on polymer resins, as being particularly active against VMSs and most amenable to multiple regeneration, are identified.

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Section: Adsorption Of Vmss Using Zeolitesmentioning

confidence: 99%

Adsorptive Biogas Purification from Siloxanes—A Critical Review

Gaj

2020

Energies

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“…It is also worth emphasizing that it is possible to control the properties of zeolites by the selection of the silica/aluminum oxide ratio in their structure. Optimizing the Si/Al ratio affects the structure of the zeolite, as well as the diameter and volume of the pores [48]. Furthermore, porosity studies of microporous zeolites often confirm the presence of mesopores in these materials, as evidenced by higher average pore diameters as well as the presence of hysteresis loops in the adsorptiondesorption isotherms [49].…”

Section: Introductionmentioning

confidence: 99%

Biodiesel Production by Methanolysis of Rapeseed Oil—Influence of SiO2/Al2O3 Ratio in BEA Zeolite Structure on Physicochemical and Catalytic Properties of Zeolite Systems with Alkaline Earth Oxides (MgO, CaO, SrO)

Szkudlarek,

Chałupka-Śpiewak,

Maniukiewicz

et al. 2024

IJMS

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Alkaline earth metal oxide (MgO, CaO, SrO) catalysts supported on BEA zeolite were prepared by a wet impregnation method and tested in the transesterification reaction of rapeseed oil with methanol towards the formation of biodiesel (FAMEs—fatty acid methyl esters). To assess the influence of the SiO2/Al2O3 ratio on the catalytic activity in the tested reaction, a BEA zeolite carrier material with different Si/Al ratios was used. The prepared catalysts were tested in the transesterification reaction at temperatures of 180 °C and 220 °C using a molar ratio of methanol/oil reagents of 9:1. The transesterification process was carried out for 2 h with the catalyst mass of 0.5 g. The oil conversion value and efficiency towards FAME formation were determined using the HPLC technique. The physicochemical properties of the catalysts were determined using the following research techniques: CO2-TPD, XRD, BET, FTIR, and SEM-EDS. The results of the catalytic activity showed that higher activity in the tested process was confirmed for the catalysts supported on the BEA zeolite characterized by the highest silica/alumina ratio for the reaction carried out at a temperature of 220 °C. The most active zeolite catalyst was the 10% CaO/BEA system (Si/Al = 300), which showed the highest triglyceride (TG) conversion of 90.5% and the second highest FAME yield of 94.6% in the transesterification reaction carried out at 220 °C. The high activity of this system is associated with its alkalinity, high value of the specific surface area, the size of the active phase crystallites, and its characteristic sorption properties in relation to methanol.

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“…[20][21][22][23][24][25][26] ZSM-5 is a manufactured zeolite with a regular channel network of pore aperture around 5-6 Å, showing high thermal stability and a surface topology that makes it advantageous for catalysis and sorption. It has been studied for pure and multicomponent adsorption of different gases, such as CO 2 , N 2 , methane, ethylene, and propane, [27][28][29][30] but no reports of HFC sorption are available in the literature.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Potential of Metal–Organic Frameworks for the Separation of Blends of Fluorinated Gases with High Global Warming Potential

et al. 2022

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human life. Therefore, the reduction of the emissions of compounds that deplete the ozone layer and/or have high global warming potential (GWP) has been a top priority in the last decades. Humanmade fluorinated greenhouse gases (F-gases), such as hydrofluorocarbons (HFCs), have been essential to human life, being used in a large range of industrial applications, such as air conditioning and refrigeration systems. [1] These gases started to be massively used after the Montreal Protocol because they are energetically efficient, do not damage the ozone layer, and have low levels of toxicity and flammability. [2] However, they are powerful greenhouse gases with a GWP up to 23 000 times greater than CO 2 and with long atmospheric lifetimes. [1][2][3] Then, international agreements were signed aiming at reducing substantially the emissions of these gases, such as the Kigali international agreement which was signed in 2016. [4] Moreover, in the European Union the 2014 F-gas legislation targets to cut emissions by two-thirds by 2030. [5] Thus, the research on green and sustainable technologies to efficiently capture, separate, and recycle F-gases is a top priority to accomplish the climate goals and to make the refrigeration and air conditioning sector more sustainable. The research on porousmaterials for the selective capture of fluorinated gases (F-gases) is key to reduce their emissions. Here, the adsorption of difluoromethane (R-32), pentafluoroethane (R-125), and 1,1,1,2-tetrafluoroethane (R-134a) is studied in four metal-organic frameworks (MOFs: Cubenzene-1,3,5-tricarboxylate, zeolitic imidazolate framework-8, MOF-177, and MIL-53(Al)) and in one zeolite (ZSM-5) with the aim to develop technologies for the efficient capture and separation of high global warming potential blends containing these gases. Single-component sorption equilibria of the pure gases are measured at three temperatures (283.15, 303.15, and 323.15 K) by gravimetry and correlated using the Tóth and Virial adsorption models, and selectivities toward R-410A and R-407F are determined by ideal adsorption solution theory. While at lower pressures, R-125 and R-134a are preferentially adsorbed in all materials, at higher pressures there is no selectivity, or it is shifted toward the adsorption R-32. Furthermore, at high pressures, MOF-177 shows the highest adsorption capacity for the three F-gases. The results presented here show that the utilization of MOFs, as tailored made materials, is promising for the development of new approaches for the selective capture of F-gases and for the separation of blends of these gases, which are used in commercial refrigeration.

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Extrusion and Characterization of High Si/Al Ratio ZSM-5 Using Silica Binder

Cited by 8 publications

References 43 publications

Adsorptive Biogas Purification from Siloxanes—A Critical Review

Adsorptive Biogas Purification from Siloxanes—A Critical Review

Biodiesel Production by Methanolysis of Rapeseed Oil—Influence of SiO2/Al2O3 Ratio in BEA Zeolite Structure on Physicochemical and Catalytic Properties of Zeolite Systems with Alkaline Earth Oxides (MgO, CaO, SrO)

Exploring the Potential of Metal–Organic Frameworks for the Separation of Blends of Fluorinated Gases with High Global Warming Potential

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