The feasibility and temporal storability of gas phase standards of volatile organic compounds prepared through liquid phase vaporization in polyester aluminum bags at room temperature

Ha, Seung-Ho; Szulejko, Jan E.; Kim, Ki‐Hyun

doi:10.1016/j.chemosphere.2021.132965

Cited by 5 publications

(4 citation statements)

References 19 publications

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“…The benzene (100–300 ppm) gaseous-working standard (G-WS) was prepared in a 100 L polyester aluminum (PEA) bag (Top Trading Co., Ltd., Seoul, South Korea) containing air by injecting suitable volumes of liquid benzene . The PEA bag injected with liquid benzene was left under ambient conditions for 20 h to completely vaporize and stabilize the benzene inside the PEA bag . The gas-phase recovery of the injected liquid benzene was assumed as ∼90% based on previously published research results .…”

Section: Methodsmentioning

confidence: 99%

“…13 The PEA bag injected with liquid benzene was left under ambient conditions for 20 h to completely vaporize and stabilize the benzene inside the PEA bag. 14 The gas-phase recovery of the injected liquid benzene was assumed as ∼90% based on previously published research results. 14 The RH in the 30−90% range was maintained by injecting DI H 2 O (680−2000 μL) into the 100 L PEA bag filled with benzene G-WS.…”

Section: Benzene Oxidation Experimentsmentioning

confidence: 99%

“…14 The gas-phase recovery of the injected liquid benzene was assumed as ∼90% based on previously published research results. 14 The RH in the 30−90% range was maintained by injecting DI H 2 O (680−2000 μL) into the 100 L PEA bag filled with benzene G-WS. For the oxidation experiments, benzene G-WS was pulled through the packed bed in the 50−250 mL min −1 range.…”

Section: Benzene Oxidation Experimentsmentioning

confidence: 99%

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Benzene Oxidation in Air by an Amine-Functionalized Metal–Organic Framework-Derived Carbon- and Nitrogen-Loaded Zirconium Dioxide-Supported Platinum Catalyst

Vikrant,

Kim,

Boukhvalov

et al. 2024

ACS Appl. Mater. Interfaces

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To learn more about the behavior of amine (NH 2 )functionalized metal−organic framework (MOF)-derived noble metal catalysts in the removal of aromatic volatile organic compounds in air, benzene oxidation at low temperatures has been investigated using 0.2-, 0.8-, and 1.5%-platinum (Pt)/ Universitetet i Oslo (UiO)-66-NH 2 . The benzene conversion (X B ) of x%-Pt/UiO-66-NH 2 -R under dry conditions (175 °C) was 23% (x = 0.2%) < 52% (x = 0.8%) < 100% (x = 1.5%): 'R' suffix denotes reduction pretreatment using a hydrogen (10 vol %) and nitrogen mixture at 300 °C for the generation of metallic Pt (Pt 0 ) sites and simultaneous partial MOF decomposition into carbonand nitrogen-loaded zirconium dioxide. The prominent role of reduction pretreatment was apparent in benzene oxidation as 1.5%-Pt/UiO-66-NH 2 did not exhibit catalytic activity below 175 °C (dry condition). The promotional role of moisture in benzene oxidation by 1.5%-Pt/UiO-66-NH 2 -R was evident with a rise in the steady-state reaction rate (r) at 110 °C (21 kPa molecular oxygen (O 2 )) from 1.3 × 10 −3 to 5.0 × 10 −3 μmol g −1 s −1 as the water (H 2 O) partial pressure increased from 0 to 1.88 kPa. In contrast, the activity was lowered with increasing RH due to catalyst poisoning by excess moisture (r (110 °C) of 6.6 × 10 −04 μmol g −1 s −1 at 2.83 kPa H 2 O (21 kPa O 2 )). Kinetic modeling suggests that X B proceeds through the Langmuir−Hinshelwood mechanism on the Pt/UiO-66-NH 2 -R surface (dissociative O 2 chemisorption and the involvement of two oxygen species in benzene oxidation). According to the density functional theory simulation, the carbon and nitrogen impurities are to make the first X B step (i.e., hydrogen migration from the benzene molecule to the substrate) energetically favorable. The second hydrogen atom from the benzene molecule is also extracted effectively, while the oxygen derived from O 2 facilitates further X B . The Pt 0 sites dissociate the O 2 and H 2 O molecules, while the product of the latter, i.e., free hydrogen and hydroxyl, makes the subsequent X B steps energetically favorable.

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Section: Methodsmentioning

confidence: 99%

Section: Benzene Oxidation Experimentsmentioning

confidence: 99%

Section: Benzene Oxidation Experimentsmentioning

confidence: 99%

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Benzene Oxidation in Air by an Amine-Functionalized Metal–Organic Framework-Derived Carbon- and Nitrogen-Loaded Zirconium Dioxide-Supported Platinum Catalyst

Vikrant,

Kim,

Boukhvalov

et al. 2024

ACS Appl. Mater. Interfaces

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“…Accordingly, the standard gases used for the experiments were stable with slight variations (<2%) in the peak area values. 14 The GWS samples with RH levels of 50 and 100% were prepared by injecting 570 and 1140 μL DI H 2 O, respectively, into the 50 L PEA bags. A fixed bed photocatalytic reactor was prepared by loading the photocatalyst (50 mg) and glass beads (200 mg) in a quartz tube (4 mm inner diameter, 6 mm outer diameter, and 90 mm length).…”

Section: Photocatalysis Experimentsmentioning

confidence: 99%

Optimization of process variables for the concurrent removal of aliphatic and aromatic volatile organic compounds over a copper impregnated titanium dioxide photocatalyst

Verma

Vikrant

Kim

2023

Environ. Sci.: Nano

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Short-term storability of volatile organic compounds in bag sampling systems under ambient conditions

Ha,

Ahmadi,

Shin

et al. 2024

Environmental Research

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The feasibility and temporal storability of gas phase standards of volatile organic compounds prepared through liquid phase vaporization in polyester aluminum bags at room temperature

Cited by 5 publications

References 19 publications

Benzene Oxidation in Air by an Amine-Functionalized Metal–Organic Framework-Derived Carbon- and Nitrogen-Loaded Zirconium Dioxide-Supported Platinum Catalyst

Benzene Oxidation in Air by an Amine-Functionalized Metal–Organic Framework-Derived Carbon- and Nitrogen-Loaded Zirconium Dioxide-Supported Platinum Catalyst

Optimization of process variables for the concurrent removal of aliphatic and aromatic volatile organic compounds over a copper impregnated titanium dioxide photocatalyst

Short-term storability of volatile organic compounds in bag sampling systems under ambient conditions

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