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![Schematic illustration of heteroepitaxial growth of a DDR-type zeolite membrane on an SSZ-13 zeolite seed layer. Reprinted from Jeong et al. with permission [99].](publication/358498921/figure/fig4/AS:1127781832364035@1645895550929/Schematic-illustration-of-heteroepitaxial-growth-of-a-DDR-type-zeolite-membrane-on-an.png)
Schematic illustration of heteroepitaxial growth of a DDR-type zeolite membrane on an SSZ-13 zeolite seed layer. Reprinted from Jeong et al. with permission [99].
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There have been significant advancements in small-pore zeolite membranes in recent years. With pore size closely related to many energy- or environment-related gas molecules, small-pore zeolite membranes have demonstrated great potential for the separation of some interested gas pairs, such as CO2/CH4, CO2/N2 and N2/CH4. Small-pore zeolite membrane...
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Citations
... Choi et al. ((Ed.), 2021) investigated the separation of CO/H 2 through polyamide composite Table 6 Polymeric materials are used in membranes for gas separation purposes (Salleh et al., 2011;Mohamad et al., 2016;Favvas et al., 2018;Mubashir et al., 2018;Iyer et al., 2020;Farnam et al., 2021;Sidhikku Kandath Valappil et al., 2021 membrane with polyimide support at a different gas flow rate and found that the purity of CO and H 2 increased. Cao et al. (2022) reviewed small pore size zeolite and suggested that CHA-type and AEI-type membranes have good potential for CO 2 /CH 4 and H 2 /CO 2 separation. Zheng et al. (2008) reported that DDR zeolite membranes are used for H 2 /CO 2 and selectivity was measured to be 32.7. ...
World estimated municipal solid waste generating at an alarming rate and its disposal is a severe concern of today's world. It is equivalent to 0.79 kg/d per person footprint and causing climate change; health hazards and other environmental issues which need attention on an urgent basis. Waste to energy (WTE) considers as an alternative renewable energy potential to recover energy from waste and reduce the global waste problems. WTE reduced the burden on fossil fuels for energy generation, waste volumes, environmental, and greenhouse gases emissions. This critical review aims to evaluate the source of solid waste generation and the possible routes of waste management such as biological landfill and thermal treatment (Incineration, pyrolysis, and gasification). Moreover, a comparative evaluation of different technologies was reviewed in terms of economic and environmental aspects along with their limitations and advantages. Critical literature revealed that gasification seemed to be the efficient route and environmentally sustainable. In addition, a framework for the gasification process, gasifier types, and selection of gasifiers for MSW was presented. The country-wise solutions recommendation was proposed for solid waste management with the least impact on the environment. Furthermore, key issues and potential perspectives that require urgent attention to facilitate global penetration are highlighted. Finally, practical implications of membrane and comparison membrane-based separation technology with other conventional technologies to recover bioenergy and resources were discussed. It is expected that this study will lead towards practical solution for future advancement in terms of economic and environmental concerns, and also provide economic feasibility and practical implications for global penetration.
... The application of CO 2 separation membranes ranges from biogas refining [4], hydrogen production [5], natural gas refining [6,7], CCUS [3], and membrane separation has proven cost-efficient and it has shown excellent environmental results. Existing CO 2 separation membranes are the mixed matrix membranes [8,9], the metal organic framework membranes [10], the carbon molecular sieve membranes [11,12], the zeolite membranes [13][14][15], the inorganic membranes [16,17] and the polymer membranes [18,19]. ...
Polyacrylamide (PAAm)-silica organic-inorganic hybrid membranes for carbon dioxide (CO2) separation were prepared via in-situ polymerization. Formation of silica and PAAm via sol-gel method and in-situ polymerization was confirmed by IR spectroscopy. Single gas permeances through the membranes were measured at 298, 373 and 423 K using CO2, He and N2. The ideal separation factor (the ratio of the permeances) of CO2/N2 through the AAm10 membrane (starting solution composition; tetraethoxysilane: methyltriethoxysilane: distilled water: hydrochloric acid: ethanol: acrylamide: dimethyl 2,2′-azobis(isobutyrate) = 0.4: 0.6: 2: 0.01: 20: 1.0: 0.1 in molar ratio) was 25.4 at 298 K. This value was thirty times higher than the theoretical Knudsen value (CO2/N2 = 0.8). Binary gas permeation at 298 K was also investigated using a gas mixture of 50%CO2–50%N2. The ideal separation factor (the ratio of the permeances) of CO2/N2 through the membrane was 24.9. This value was the same as the ideal separation factor of CO2/N2 calculated from the single gas measurement. Such a high CO2 selectivity in 50%CO2-50%N2 feed gas was also found even at high temperature for this membrane.
Graphical abstract
A detailed understanding of the molecular diffusion in zeolite frameworks is crucial for analysing the factors controlling their catalytic performance in alkenes. In this work, we present a molecular dynamics...
An organic cation lacking specificity in its structure-direction action offers the possibility, through a screening of other structure-directing parameters, to synthesize a variety of zeolites. In this work we show...
