Complete Oxidation of Ethylene by Co-Modified Mordenites under Microwave Irradiation

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

doi:10.1252/jcej.38.828

Cited by 13 publications

(7 citation statements)

References 12 publications

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“…In contrast, ethylene decomposition with heterogeneous catalysts has been recognized as a sustainable method for practical applications. Several catalysts such as Co/mordenite, Au/Al 2 O 3 , Pt/Ce 0.64 Zr 0.16 Bi 0.20 O 1.98 /γ-Al 2 O 3 , Cu/MnO 2 , CoO/mesoporous carbon, Pt/MnO 2 , Ag/zeolite, , Pt/zeolite, Pt/SBA-15, and a UV-light responsive Pt/TiO 2 photocatalyst − have been studied for ethylene oxidation at >25 °C. Au/Co 3 O 4 catalyst was reported to be effective for low temperature oxidation of ethylene at 0 °C; − however, the supported Au catalyst cannot realize complete ethylene removal at 0 °C (ca.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Trace Ethylene at 0 °C over Platinum Nanoparticles Supported on Silica

Satter

Yokoya

Hirayama

et al. 2018

ACS Sustainable Chem. Eng.

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Oxidation of trace ethylene (50 ppm) at 0 °C was systematically studied using Pt nanoparticles supported on mesoporous silica (SBA-15) in a fixed-bed flow reactor. The SBA-15 supported Pt catalyst (1.8 wt % Pt loading) exhibited an ethylene conversion higher than 99% at the initial stage, which gradually began to decrease at 90 min and reached 33% within 240 min. The CO2 yield was lower than the corresponding ethylene conversion before the steady state was reached. This was due to the formation of intermediates that were stabilized on the catalyst surface. These intermediates could be recovered in the form of CO2 by heating the spent catalyst in a mixed N2 and He (1:19, v/v) flow at 150 °C. The addition of water vapor to the catalyst bed decreased the original activity drastically because physically adsorbed water molecules partly blocked the active Pt sites. Control experiments using nonordered silica supports (Aerosil 380 and 200) showed similar catalytic behavior as that observed with SBA-15. The formation of highly dispersed Pt nanoparticles on the silica surfaces is thus the key to the development of effective Pt catalysts for low-temperature oxidation of ethylene.

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Section: Introductionmentioning

confidence: 99%

Oxidation of Trace Ethylene at 0 °C over Platinum Nanoparticles Supported on Silica

Satter

Yokoya

Hirayama

et al. 2018

ACS Sustainable Chem. Eng.

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“…[1][2][3][4] However, high production costs and inefficiency in removing trace amounts of ethylene were drawbacks of these methods. Several photocatalysts have also been used, [5][6][7][8] but this resulted in limited application because of the more complicated working conditions required.Many attempts have been made by Hao et al to develop gold catalysts supported on Co 3 O 4 for the removal of ethylene at low temperature. First, 2 wt % Au/Co 3 O 4 catalyst prepared by a deposition-precipitation method showed only 7.4 % conversion of ethylene at 20 8C from a relatively low concentration (1050 ppm).…”

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confidence: 99%

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confidence: 99%

Low‐Temperature Oxidation of Ethylene over Platinum Nanoparticles Supported on Mesoporous Silica

2013

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Ethylene is a gaseous volatile organic compound (VOC) that works as a plant hormone to inhibit or promote plant growth. Ethylene released from fruits, vegetables, and flowers can accelerate aging and spoiling of plants even in refrigerators at low temperature. Consequently, the removal of trace amounts of ethylene at low temperature (ca. 0 8C) is imperative.Previously, biotechnological materials, such as soil bacteria, dry biobeds, and biofilters were applied for removal of ethylene. [1][2][3][4] However, high production costs and inefficiency in removing trace amounts of ethylene were drawbacks of these methods. Several photocatalysts have also been used, [5][6][7][8] but this resulted in limited application because of the more complicated working conditions required.Many attempts have been made by Hao et al. to develop gold catalysts supported on Co 3 O 4 for the removal of ethylene at low temperature. First, 2 wt % Au/Co 3 O 4 catalyst prepared by a deposition-precipitation method showed only 7.4 % conversion of ethylene at 20 8C from a relatively low concentration (1050 ppm). [9] A more active catalyst, 2.5 wt % Au nanoparticles supported on mesoporous Co 3 O 4 , was later prepared by a nanocasting method, but the catalytic activity was still insufficient for complete removal of trace (50 ppm) ethylene at 0 8C despite the complicated preparation method. [10] Gold nanoparticles supported on Co 3 O 4 rods recently prepared by a hydrothermal method solved the timeconsuming problem of catalyst preparation; however, the method afforded no significant improvement in catalytic activity. [11] Therefore, further catalyst screening is still necessary to find sufficiently active catalysts to remove low concentrations of ethylene.Herein, we report the catalytic performance of Pt nanoparticles supported on mesoporous silica MCM-41 for ethylene oxidation under low-temperature conditions. This study has revealed the influence of metals (Pt, Pd, Au, and Ag) and supports (MCM-41, SiO 2 , Al 2 O 3 , ZrO 2 , and TiO 2 ) on the catalytic performance. The Pt nanoparticles supported on MCM-41 exhibited the highest activity and demonstrated excellent durability in prolonged reaction time or recycle use.The conversion of 50 ppm ethylene over 1 wt % Pt/MCM-41 at 0 8C was over 99.8 %. To our knowledge, this is the highest conversion of ethylene oxidation at low temperature reported to date.All of the catalysts were prepared by using a typical wet impregnation method. Characterization of the catalysts was conducted by various physicochemical methods. The structural parameters are summarized in Table 1 and Table S1 (in the Supporting Information). The small-angle X-ray diffraction (XRD) patterns of MCM-41 and 5 wt % Pt/MCM-41 (Figure S1a) are consistent with the literature, [12] and peaks appeared at (100), (110), and (200), a characteristic of a typical two-dimensional hexagonal structure of mesopores in MCM-41. This result indicates that the mesoporous structure remains unchanged after the incorporation of Pt nanoparticles. However, n...

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“…Taking into account the very restrictive storage conditions for fresh products, photocatalytic oxidation at ambient temperature appears to be a promising alternative and has attracted considerable attention over the last ten or more years. [7][8][9][10][11] Compared with traditional treatments such as activated carbon adsorption, micro-biological degradation and thermocatalysis, photocatalytic degradation has several advantages, including low cost, the fact that it is environmentally friendly and no waste disposal problem. The y in the ointment is the development of highly active photocatalysts for ethylene photo-oxidation remains a challenging task.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Y_xBi_1−xVO₄ solid solutions for efficient C₂H₄ photodegradation

et al. 2015

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Complete Oxidation of Ethylene by Co-Modified Mordenites under Microwave Irradiation

Cited by 13 publications

References 12 publications

Oxidation of Trace Ethylene at 0 °C over Platinum Nanoparticles Supported on Silica

Oxidation of Trace Ethylene at 0 °C over Platinum Nanoparticles Supported on Silica

Low‐Temperature Oxidation of Ethylene over Platinum Nanoparticles Supported on Mesoporous Silica

Fabrication of Y_xBi_1−xVO₄ solid solutions for efficient C₂H₄ photodegradation

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Complete Oxidation of Ethylene by Co-Modified Mordenites under Microwave Irradiation

Cited by 13 publications

References 12 publications

Oxidation of Trace Ethylene at 0 °C over Platinum Nanoparticles Supported on Silica

Oxidation of Trace Ethylene at 0 °C over Platinum Nanoparticles Supported on Silica

Low‐Temperature Oxidation of Ethylene over Platinum Nanoparticles Supported on Mesoporous Silica

Fabrication of YxBi1−xVO4 solid solutions for efficient C2H4 photodegradation

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Fabrication of Y_xBi_1−xVO₄ solid solutions for efficient C₂H₄ photodegradation