4/9/2023 0 Comments Zeolite core shell fuel cellAmong them, adsorption is an effective technique because of its low cost and easy operation. Various technologies have been used to deal with toluene. It can damage the liver and nervous system of human body, and even cause cancer and other hazards. Toluene is a representative VOC, widely used as organic solvents and chemical raw material in the electronics, chemistry, and printing industries. With the rapid development of technology and industry, the widespread use of new products and chemicals has caused a large number of volatile organic compounds (VOCs) emitted, which seriously harms to the atmospheric environment and human health. This work not only proposes a new hydrophobic zeolite-based VOCs adsorbent, but also provides a new idea for the preparation of a series of hydrophobic adsorbents. In addition, such composite strategy was suitable for other zeolites (EMT, ZSM-5, and Beta zeolite) to realise hydrophobic modification, which increased the adsorption capacity under wet conditions. It also exhibited excellent adsorption and desorption performance under 60% RH, which was suitable for the practical application. The adsorption capacity of was 69.9% higher than that of Y zeolite at dry condition, and increased about 96% under 90% relative humidity (RH). The TEM results showed that hydrophobic organic polymer was uniformly coated on the external surface of Y zeolite through the bridging effect of phenylsilane. In this work, we reported a strategy to synthesise Y zeolite and hydrophobic organic polymer core-shell composites ( ), which significantly improved the hydrophobicity and toluene adsorption capacity of Y zeolite. However, the hydrophilicity of zeolites surface limits their practical application because of the competitive adsorption between water and VOCs. dependence of selectivity to $$ (a) and aromatics (b) on the Si/Al ratio for the ZSM-5 zeolites summarized from literatures the reaction process in the zeolite with low (c) and high (d) density of Brønsted acid site (BAS) (with permission from Springer Nature)įigure 13. Performance of the bifunctional ZnCrO x -SAPO-18 catalyst in syngas conversion as a function of the Si/Al ratio (a): CO conversion and selectivity (b): ratio of C 3/C 2 and olefins to paraffins (O/P) (with permission from American Chemical Society)įigure 14. Effect of density of Brønsted acid sites on the catalytic behaviors of the bifunctional Zn-ZrO 2/SSZ-13 catalyst in syngas conversion (with permission from RSC Publications)įigure 15. Core/shell catalyst of Co/Al 2O 3/H-beta (with permission from Wiley Publications)įigure 16.Zeolites with high specific surface area and good stability are considered ideal adsorbent for volatile organic compounds (VOCs) adsorption. Detailed product distribution over the Y meso catalysts modified by different elements: (b) Co/Y meso-Ce, (c) Co/Y meso-La and (d) Co/Y meso-K(with permission from Springer Nature)įigure 5. Syngas conversion with the OX-ZEO bifunctional catalyst systemsįigure 6. Framework structures of (a) Y, (b) MFI, and (c) CHA zeolitesįigure 7. Impact of zeolite topology on the propagation of olefin- and aromatic-based cycles for the conversion of methanol to hydrocarbons (MTH) ((a), (b)): 8 MR zeolites, composed of large cavities with small window openings ((c), (d)): 1D 10 MR zeolites ((e), (f)): 3D 10 MR MFI zeolite ((g), (h)): 1D 12 MR zeolite (with permission from Springer Nature)įigure 8. Effect of window size of SAPO zeolites on the performance of related bifunctional ZnAlO x /SAPO catalysts in the syngas conversion (with permission from Elsevier)įigure 9. Effect of cage size of SAPO zeolites with 8 MR windows on the performance of related bifunctional ZnAlO x/SAPO catalysts in the syngas conversion (with permission from Elsevier)įigure 10. Hydrocarbon distributions in the conversion of syngas, ketene and methanol over different sites of MOR zeolites at 648 K (a)−(c): 8 MR acid sites (d)−(f): 12 MR acid sites (g)−(i): both the 8 MR and 12 MR acid sites ((a), (d), (g)): syngas over ZnCrO x-MOR ((b), (e), (h)) ketene conversion over MOR ((c), (f), (i)): methanol conversion over MOR (with permission from Wiley)įigure 11. Syngas to aromatics over ZnCrO x-ZSM-5 Distributions of aromatics and C 6+ aliphatics in C 6+ hydrocarbons as a function of the length ratio of the b/ a axes (with permission from Elsevier)įigure 12. Impact of acidity on the propagation of two cycles in MTH. Figure 1. Typical routes for syngas conversion to lower olefins, aromatics and various hydrocarbonsįigure 2. ASF model of Fischer-Tropsch synthesis (with permission from RSC Publications)įigure 3. Reaction mechanism of the direct synthesis of isoparaffins from syngas over Co/ASB (with permission from ACS Publications)įigure 4. Catalytic performance of Co/Y meso in the transformation of syngas (a) FTS with conventional supports or Y meso zeolites.
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