Binary adsorption of very low concentration ethylene and water vapor on mordenites and desorption by microwave heating

Kim, Seong-Ick; Aida, Takashi; Niiyama, Hiroo

doi:10.1016/j.seppur.2005.03.006

Cited by 37 publications

(13 citation statements)

References 21 publications

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“…Recent studies have suggested some processes for treating ethylene-containing air, including photocatalytic oxidation (Fu et al, 1996;Krishnankutty et al, 1996;Obee and Hay, 1997;Sirisuk et al, 1999;Yamazaki et al, 1999;Zorn et al, 2000;Rojluechai et al, 2007), biofiltration (Kim, 2003), adsorption (Chen et al, 1999), and cyclic adsorption-catalytic degradation processes (Kim et al, 2005). However, the degradation of ethylene using a TiO 2 photocatalyst in an actual environment with humidity is difficult because the degradation rate decreases with increasing relative humidity (Obee and Hay, 1997) due to the strong hydrophobicity of ethylene (Henry's law constant for solubility in water = 0.0048 mol/kg/bar at 298.15 K) (NIST Chemistry Web Book, 2012).…”

Section: Introductionmentioning

confidence: 99%

Removal of Ethylene and Secondary Organic Aerosols Using UV-C254 + 185 nm with TiO2 Catalyst

Chang

Sekiguchi

Wang

et al. 2013

Aerosol Air Qual. Res.

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In this investigation we evaluated the feasibility and effectiveness of ozone-producing UV (254 + 185 nm) irradiation and a TiO 2 photocatalyst for degradation of ethylene, which is strongly hydrophobic and does not decompose easily in a humid environment. Tests were performed in a photoreactor (V = 0.55 L) under UV irradiation at various wavelengths (365, 254 and 254 + 185 nm), relative humidities (RH < 1% and RH > 86%), atmospheres (pure N 2 and air), residence times (11-33 sec), initial ethylene concentrations in the range of 25-105 ppmv and TiO 2 contact areas (86.4-259 cm 2 ) with presumably ambient pressure and temperature.The experimental results demonstrated that the use of TiO 2 under 254 + 185 nm UV irradiation significantly enhanced the photodegradation of ethylene compared to the case of UV irradiation alone, due to the synergistic effect of photochemical oxidation in the gas phase and photocatalytic oxidation on the TiO 2 surface. Photodegradation induced with 254 + 185 nm UV irradiation was compared with photodegradation induced with UV irradiation at wavelengths of 365 and 254 nm. The highest conversion and mineralization levels were obtained with 254 + 185 nm UV irradiation among the three tested UV sources. Moreover, irradiating with 254 +185 nm light generated secondary organic aerosols (SOA) via gas-to-particle conversion of organic compounds in the air stream. The results indicate that the concentration of generated SOAs decreased in the presence of the TiO 2 catalyst, and thus that TiO 2 may be used to effectively control the emissions of undesirable SOAs.In an application test, for photocatalytic oxidation with 254 + 185 nm UV irradiation, corresponding to a flow rate of 0.5 L/min, and an initial concentration of 34 ppmv, over 90% of the inlet ethylene could be degraded.

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Section: Introductionmentioning

confidence: 99%

Removal of Ethylene and Secondary Organic Aerosols Using UV-C254 + 185 nm with TiO2 Catalyst

Chang

Sekiguchi

Wang

et al. 2013

Aerosol Air Qual. Res.

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“…[21] Within the MW region, 2450 MHz is one of the most commonly used frequencies for catering or consumer heating. [22] The heat derives from the temporary dipole movement caused by the alternating electric field. The temporary dipole movement generates friction inside the dielectric, and the energy is dissipated subsequently as heat, resulting in energy absorption.…”

Section: Introductionmentioning

confidence: 99%

“…[23,24] Compared with conventional heating techniques, MW heating offers additional advantages in processes including high heating rates, no direct contact, and significant savings in energy consumption. [22,24] Our previous studies concluded that shape-memory poly(vinyl alcohol) (SM-PVA) could present a good temperature-sensitive SME, [25] and SM-PVA immersed in water or some organic solvents also showed excellent solvent-induced shape recovery. [26] Because PVA is a typical hydrophilic polymer, the abundant hydroxy groups have a strong affinity towards water molecules after immersing PVA into water.…”

Section: Introductionmentioning

confidence: 99%

Microwave‐Induced Shape‐Memory Effect of Chemically Crosslinked Moist Poly(vinyl alcohol) Networks

Jiang

et al. 2011

Macro Chemistry & Physics

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MWs are explored as the driving force for an SMP based on chemically crosslinked moist PVA networks. The samples show rapid shape recovery under MW irradiation, whereas dry samples experience no shape changes when irradiated. This effect is attributed to the heat created by vibrating water molecules inside the samples that supplies the energy required for shape recovery. The rate of recovery rate is affected not only by the water content in the material but also by the applied MW power output. Automatic network analysis, DSC, and DMA are used to study the dielectric, thermal and mechanical properties of the samples. MW‐induced shape recovery offers advantages such as high and variable recovery rate and the absence of direct contact between the heating source and the material. magnified image

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“…Generally, zeolites and carbon-based materials are used as absorbents for the removal of ethylene. The adsorption capacities of zeolites as adsorbents were reported by Kim et al as being in the range of 0.7e1.3 mmol/g (Kima et al, 2005). Moreover, the ethylene removal capacity of clay minerals (~10 mmol/g) is greater than that of MSTLP (6.93 mmol/g) (Albunia et al, 2008).…”

Section: Regeneration Studiesmentioning

confidence: 95%

“…Moreover, FTIR spectral analysis of the regenerated MSTLP revealed that it had the same chemical nature as did MSTLP. Table 3 presents the comparative ethylene adsorption capacities of MSTLP and of some other economical adsorbents as obtained from a literature review (Wu et al, 1997;Wills and Warton, 2004;Kima et al, 2005;Liu et al, 2006;Albunia et al, 2008). Generally, zeolites and carbon-based materials are used as absorbents for the removal of ethylene.…”

Section: Regeneration Studiesmentioning

confidence: 99%

Spent tea leaves: A new non-conventional and low-cost biosorbent for ethylene removal

Tzeng

Weng

Huang

et al. 2015

International Biodeterioration & Biodegradation

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Binary adsorption of very low concentration ethylene and water vapor on mordenites and desorption by microwave heating

Cited by 37 publications

References 21 publications

Removal of Ethylene and Secondary Organic Aerosols Using UV-C254 + 185 nm with TiO2 Catalyst

Removal of Ethylene and Secondary Organic Aerosols Using UV-C254 + 185 nm with TiO2 Catalyst

Microwave‐Induced Shape‐Memory Effect of Chemically Crosslinked Moist Poly(vinyl alcohol) Networks

Spent tea leaves: A new non-conventional and low-cost biosorbent for ethylene removal

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