Catalytic oxidation of low concentration formaldehyde over Pt/TiO2 catalyst

A series of Pd-TiO2/Pd-Ce/TiO2 catalysts were prepared by an equal volume impregnation method. The effects of different Pd loadings on the catalytic activity of chlorobenzene (CB) were investigated, and the results showed that the activity of the 0.2%-0.3% Pd/TiO2 catalyst was optimal. The effect of Ce doping enhanced the catalytic activity of the 0.2% Pd-0.5% Ce/TiO2 catalyst. The characterization of the catalysts using BET, TEM, H2-TPR, and O2-TPD showed that the oxidation capacity was enhanced, and the catalytic oxidation efficiency was improved due to the addition of Ce. Ion chromatography and Gas Chromatography-Mass Spectrometer results showed that small amounts of dichlorobenzene (DCB) and trichlorobenzene (TCB) were formed during the decomposition of CB. The results also indicated that the calcination temperature greatly influenced the catalyst activity and a calcination temperature of 550 °C was the best. The concentration of CB affected its decomposition, but gas hourly space velocity had little effect. H2-TPR indicated strong metal–support interactions and increased dispersion of PdO in the presence of Ce. HRTEM data showed PdO with a characteristic spacing of 0.26 nm in both 0.2% Pd /TiO2 and 0.2% Pd-0.5% Ce/TiO2 catalysts. The average sizes of PdO nanoparticles in the 0.2% Pd/TiO2 and 0.2% Pd-0.5% Ce/TiO2 samples were 5.8 and 4.7 nm, respectively. The PdO particles were also deposited on the support and they were separated from each other in both catalysts.

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Catalytic oxidation of hexachlorobenzene in simulated gas on V2O5–WO3/TiO2 catalyst

Chemical Engineering Journal ◽

10.1016/j.cej.2012.03.069 ◽

2012 ◽

Vol 192 ◽

pp. 284-291 ◽

Cited By ~ 18

Author(s):

Yang Yang ◽

Gang Yu ◽

Shubo Deng ◽

Siwen Wang ◽

Zhenzhen Xu ◽

...

Keyword(s):

Catalytic Oxidation ◽

Tio2 Catalyst

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Supercritical Fluids Synthesis of Catalyst Nanoparticles- Decorated Nanocarbon for Low Concentration Formaldehyde Sensing

ECS Meeting Abstracts ◽

10.1149/ma2020-01292246mtgabs ◽

2020 ◽

Vol MA2020-01 (29) ◽

pp. 2246-2246

Author(s):

Cheng-Kang Yang ◽

Shih-Han Wang ◽

Meng-Jie Wen ◽

Jin-Yi Liao

Keyword(s):

Supercritical Fluids ◽

Catalyst Nanoparticles ◽

Low Concentration ◽

Formaldehyde Sensing ◽

Low Concentration Formaldehyde

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Removal of low-concentration formaldehyde in air by adsorption on activated carbon modified by hexamethylene diamine

Carbon ◽

10.1016/j.carbon.2011.02.058 ◽

2011 ◽

Vol 49 (8) ◽

pp. 2873-2875 ◽

Cited By ~ 50

Author(s):

Chanjuan Ma ◽

Xinghua Li ◽

Tianle Zhu

Keyword(s):

Activated Carbon ◽

Hexamethylene Diamine ◽

Low Concentration ◽

Formaldehyde In Air ◽

Low Concentration Formaldehyde

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Fabrication and Formaldehyde-Sensing Property of Quartz Crystal Microbalance (QCM) Coated with PVP-MWCNTs Composites

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.645-646.719 ◽

2015 ◽

Vol 645-646 ◽

pp. 719-723 ◽

Cited By ~ 1

Author(s):

Ying Fei He ◽

Ya Dong Jiang ◽

Hui Ling Tai ◽

Guang Zhong Xie

Keyword(s):

Quartz Crystal Microbalance ◽

Quartz Crystal ◽

Absorption Spectrometry ◽

Fast Response ◽

Formaldehyde Concentration ◽

Multiwalled Carbon ◽

Low Concentration ◽

Spray Process ◽

Formaldehyde Sensing ◽

Low Concentration Formaldehyde

In this paper, the quartz crystal microbalance (QCM) sensors coated with polyvinyl pyrrolidone (PVP)-multiwalled carbon nanotubes (MCWNTs) nanocomposite thin films were developed by the spray process, which were used for the detection of low concentration formaldehyde at room temperature. The surface morphology and structure of films was analyzed by scanning electron microscope (SEM), UV-Vis absorption spectrometry, respectively, and the formaldehyde-sensing properties of sensors were investigated. The results showed that the prepared QCM gas sensor exhibited the linear characteristic, fast response, good reproducibility to low concentration formaldehyde within 6 ppm, and the poisoning of films was observed when the formaldehyde concentration exceeded 6ppm. Moreover, the sensitivity of the sensor could achieve up to 1Hz/ppm and had the good stability of response values.

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