Room-temperature formaldehyde catalytic decomposition

Ye, Jiawei; Wang, Yuanyuan; Fan, Jiajie; Ho, Wingkei

doi:10.1039/d0en00831a

Cited by 77 publications

(44 citation statements)

References 217 publications

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“…[2] Super concentrated harmful gases can cause acute pollutant poisoning. [3] Even if the concentration is not too high, long-term exposure to these harmful gases will lead to chronic bronchitis, emphysema, and lung cancer. Additionally, if the toxic gases act metal oxide semiconductors (MOSs) (e.g., ZnO, SnO 2 , In 2 O 3 , Co 3 O 4 , and CuO).…”

Section: Introductionmentioning

confidence: 99%

Semiconductor Gas Sensor for Triethylamine Detection

Liu

Zhang

Fan

et al. 2021

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on the body for a long time, the genetic material will be damaged and mutations occur, which will result in abnormalities in the offspring. [4] Thus, it is urgent to develop devices to monitor these toxic gases. [5] The current devices for analyzing gas state pollutants are thin-layer chromatography scanner, [6] flame ionization detector, [7] gas chromatography-mass spectrometer (GC-MS), [8] and high-performance liquid chromatograph. [9] They can accurately detect and analyze these harmful gases, but they are bulky, expensive, laborious, and time-consuming. In addition, they cannot achieve real-time detection, so they cannot be widely used. By contrast, gas sensors have the advantages of portability, low expense, real-time monitoring and high sensitivity. According to different sensing principles, gas sensors can be divided into resistance-based, [10] optical, [11] micro-cantilever, [12] surface plasmon resonance, [13] surface acoustic, [14] and microwave sensors. [15] Among them, the resistance-based gas sensors have become a research hotspot due to their high sensitivity, good repeatability, and excellent selectivity. [16] Based on our survey, the history of resistance-based gas sensors dates back to several decades ago. Approximately 60 years ago, Brattain and Heiland discovered that the resistances of semiconductor materials vary according to the atmosphere. [17] Soon, Seiyama et al. applied this feature to detect harmful gases. [18] Then the first resistancebased gas sensor was successfully designed and patented by Taguchi. [17] The boiling point of triethylamine (TEA) is 89.5 °C at the normal temperature and pressure. Since its molecular formula contains hydrogen and carbon atoms, it is classified as a volatile organic compound (VOC). [19] Hitherto, TEA has been widely applied in many areas, such as, agriculture, fishery, and aviation, as well as, medication and health. [20] For example, it can be used as preservatives, surfactants, organic solvents, catalysts, etc. Moreover, studies have shown that putrid fish and shellfish releases TEA. In this regard, TEA can be used as a criterion to access the freshness of marine fish. [21] However, TEA harms the human body, mainly as a strong irritation to the skin and mucous membranes as well as the central nervous system. After prolonged exposure to TEA, some people are infected with emphysema and even die directly. According to the recommendations of the National Institute for Occupational Safety and Health Administration (NIOSH), the concentration of indoor TEA should be lower than 10 ppm. [22] The structure, application and hazards of TEA are schematic illustrated in Figure 1.Resistance-based gas sensors are effective in monitoring TEA. Currently, these resistance-based sensors are mainly With the demanding detection of unique toxic gas, semiconductor gas sensors have attracted tremendous attention due to their intriguing features, such as, high sensitivity, online detection, portability, ease of use, and low cost. Triethylamine, a typical gas of volatile organic...

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Section: Introductionmentioning

confidence: 99%

Semiconductor Gas Sensor for Triethylamine Detection

Liu

Zhang

Fan

et al. 2021

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“…However, if we look at Ag/Meso-ZSM-5, the desorption was still intense until 160°C, so there are a lot active sites covered by HCHO at high temperatures. A lot of researches showed a strong association between catalyst activity and the formation of DOM (intermediate species), which we can see in figure 8 [5,7,27]. More specifically, the more and faster the number of DOM species is generated, the better the catalystic performance.…”

Section: Figure 1 N2 Adsorption-desorption Isothermsmentioning

confidence: 98%

“…Thermal oxidation is one of them, which permits to oxidize formaldehyde to harmless and less harmful products (H2O and CO2) by rising the temperature above the ignition point in O2 flow. However, they require very high operation temperature and choosing the feed composition to avoid explosion [4][5][6]. Catalytic oxidation is a promising technique to completely convert HCHO into H2O and CO2 at lower operating temperature and lower capital cost.…”

Section: Introductionmentioning

confidence: 99%

“…However, micropores in conventional zeolites have high mass transfer resistance for reactants, intermediates and products to go through their channels and cages. This problem could be addressed by expanding the micropores within zeolites [5,[18][19][20]. Furthermore, introducing a more extensive pore system into the zeolites can also help reduce coke formation since reactants, intermediates and products can rapidly diffuse through their channels [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Catalytic oxidation of formaldehyde over silver supported on ZSM-5: The role of Ag and mesopores

Luon

Long

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Silver nanoparticles (AgNPs) are increasingly drawing a great deal of attention because of their exclusive properties and a huge variety of applications. In recent years, using AgNPs supported on various carriers as heterogeneous catalysts has become promising for treating some toxic gases in the environment, such as HCHO. This study has successfully synthesized AgNPs onto ZSM-5 microporous zeolite and ZSM-5 mesopore-modified zeolite (Meso-ZSM-5) by ion-exchange method using sodium borohydride as a reducing agent. The resulting catalysts were then characterized by N2 adsorption-desorption method. In order to evaluate HCHO adsorption, desorption, and the surface reaction of these catalysts, temperature-programmed desorption (TPD) and temperature-programmed surface reaction (TPSR) were employed. The TPD and TPSR experiments were conducted with different relative humidity. The results showed that Ag/Meso-ZSM-5 exhibited higher catalyst activity in HCHO complete oxidation than Ag/ZSM-5 at high temperatures because of a new larger pore system within the zeolite. Furthermore, TPD and TPSR experiments provided an explanation for the poor performance of the catalysts at low temperatures, which was associated with the high adsorption capacity of the zeolite.

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“…Among them, thermal catalytic oxidation of HCHO into CO 2 and H 2 O is considered as most promising due to the advantages of high removal efficiency, long‐time effectiveness, energy‐saving, economic feasibility, and lack of secondary pollution [20–22] . Many types of catalysts have been investigated for the catalytic oxidative decomposition of HCHO in recent years [22–26] . In general, supported noble metal (e. g., Pt, Pd, Au, and Ag) catalysts, such as Pt/TiO 2 , [27,28] Pb/CeO 2 , [17] Au/CeO 2 , [29] and Ag/Al 2 O 3 , [30] have been found to perform well in catalyzing HCHO oxidation.…”

Section: Introductionmentioning

confidence: 99%

Efficient Decomposition of Formaldehyde on Ni−Al Hydrotalcite/AlOOH Nanocomposites Decorated with Pt Nanoparticles at Ambient Temperature

Qin

Cheng

2021

ChemNanoMat

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Nanocomposites of nickel‐aluminum hydrotalcite (Ni−Al HT) and boehmite (AlOOH) decorated with Pt nanoparticles (NPs) were synthesized and evaluated for catalytic oxidation of formaldehyde at ambient temperature. Experimental results showed that Ni−Al HT modification improved the activity of Pt/AlOOH, and the nanocomposite with Ni/Al molar ratio of 1 : 9 (Pt/Ni1Al9) exhibited remarkable and stable catalytic activity. Characterization results indicated that Pt/Ni1Al9 had a larger specific surface area, higher degree of Pt NPs dispersion, and more surface active sites compared to the nanocomposites with other Ni/Al ratios. The enhanced catalytic activity of Pt/Ni1Al9 was attributed to the generation of more surface active oxygen species from the adsorbed oxygen molecules, which was activated by the electron transfer between Ni−Al HT and Pt/AlOOH, and the suitable interaction and synergistic effect among Ni−Al HT, Pt NPs, and AlOOH. These findings indicate that the nanocomposites of Ni−Al hydrotalcite and boehmite hold significant promises for removal of indoor formaldehyde.

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Room-temperature formaldehyde catalytic decomposition

Abstract: Formaldehyde (HCHO) is considered as a major indoor air pollutant, which may cause serious health problems for humans. Therefore, HCHO needs to be removed from indoor air. Several techniques have...

Cited by 77 publications

References 217 publications

Semiconductor Gas Sensor for Triethylamine Detection

Semiconductor Gas Sensor for Triethylamine Detection

Catalytic oxidation of formaldehyde over silver supported on ZSM-5: The role of Ag and mesopores

Efficient Decomposition of Formaldehyde on Ni−Al Hydrotalcite/AlOOH Nanocomposites Decorated with Pt Nanoparticles at Ambient Temperature

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