Enhanced catalytic oxidation of formaldehyde over dual-site supported catalysts at ambient temperature

Liu, Bo‐Tau; Hsieh, Cheng-Hsien; Wang, Weihong; Huang, Chunli; Huang, Chung-Jie

doi:10.1016/j.cej.2013.08.005

Cited by 25 publications

(6 citation statements)

References 33 publications

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“…Besides, formaldehyde could condense with surface acetate and acetic acid to form carboxylic acids, a precursor for olefins via decarboxylation (Figure b) . Additionally, formaldehyde could promote aromatics selectivity, accelerating the deactivation via forming bulky coke species (Figure a). , Since the Lewis acid site (LAS) (e.g., CeO 2 , ZnO, TiO 2 ) could decompose formaldehyde, utilizing the bifunctional BAS-LAS zeolite system would be an appropriate way to improve the catalyst lifetime (Figure c; BAS, Brønsted acid site). , With this objective, Hwang et al evaluated the lifetime of bifunctional catalysts (H-SAPO-34 and Y 2 O 3 ) in different fixed-bed configurations: Y 2 O 3 packed upstream of H-SAPO-34, Y 2 O 3 packed downstream of H-SAPO-34, an interpellet physical mixture of H-SAPO-34 with Y 2 O 3 , and an intrapellet physical mixture of H-SAPO-34 with Y 2 O 3 , in addition to the standalone zeolite. The addition of Y 2 O 3 does not directly influence the MTH reaction, yet it facilitates HCHO decomposition into CO.…”

Section: Zeolite-catalyzed Methanol Conversionmentioning

confidence: 99%

“…104 Additionally, formaldehyde could promote aromatics selectivity, accelerating the deactivation via forming bulky coke species (Figure 6a). 105,106 Since the Lewis acid site (LAS) (e.g., CeO 2 , 107 ZnO, 108 TiO 2 109 ) could decompose formaldehyde, utilizing the bifunctional BAS-LAS zeolite system would be an appropriate way to improve the catalyst lifetime (Figure 6c; BAS, Brønsted acid site). 107,108 With this objective, Hwang et al 110 6d).…”

Section: Impact Of Kochmentioning

confidence: 99%

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Evaluating the Role of Descriptor- and Spectator-Type Reaction Intermediates During the Early Phases of Zeolite Catalysis

Gong

Chowdhury

2022

ACS Catal.

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The philosophy of "Ikigai"�a reason for being�could be extended to rationalize the role of organic reaction intermediates in zeolite catalysis. Each reaction intermediate's ikigai is specific under the confined microenvironment of the zeolite: either controlling the product selectivity (i.e., "descriptor"-type reaction intermediates) or promoting the catalyst deactivation (i.e., "spectator"-type reaction intermediates). Based on the process conditions and zeolite topologies, the ikigai of reaction intermediates could be altered, where the "descriptor" character could turn into a "spectator" depending on the working environment. Although the spectroscopy-/mechanism-driven development of catalytic technologies has been accelerated in the past decade and can now identify "elusive" zeolite-trapped reaction intermediates, it still does not always necessarily imply their "positive" impact during catalysis. Therefore, future research activities should be dedicated to recognizing the true ikigai of identified reaction intermediates: i.e., differentiating their spectator role from the catalytically relevant descriptor. Considering its potential industrial application, we will present our account and philosophy on the current status and future impact of mechanism-driven development of zeolite-mediated catalytic technologies in this Perspective.

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Section: Zeolite-catalyzed Methanol Conversionmentioning

confidence: 99%

Section: Impact Of Kochmentioning

confidence: 99%

Evaluating the Role of Descriptor- and Spectator-Type Reaction Intermediates During the Early Phases of Zeolite Catalysis

Gong

Chowdhury

2022

ACS Catal.

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“…A long-term exposure to HCHO can cause serious health problems such as eye irritation, respiratory tract, headache, pneumonia, and even cancer. , Therefore, the elimination of gaseous HCHO from the indoor environment is an important issue. Usually physical adsorption and chemical oxidation are used for HCHO removal. − Physical adsorption is a simple and effective approach to eliminate HCHO under ambient conditions; however, its wide application is largely restricted by the limited adsorption capacity and the need for adsorbent regeneration. Catalytic oxidation of HCHO is advantageous as compared to physical adsorption, because it can completely decompose HCHO into CO 2 and H 2 O. − Catalysts like transition metal oxides and supported noble metals, such as Pt, Au, and Pd, have been extensively explored for oxidation of gaseous HCHO. ,− As compared to the transition-metal oxide catalysts, the supported noble metal catalysts are usually very efficient for complete oxidation of HCHO at lower temperatures, even at room (or ambient) temperature.…”

Section: Introductionmentioning

confidence: 99%

Highly Active Mesoporous Ferrihydrite Supported Pt Catalyst for Formaldehyde Removal at Room Temperature

Yan

Wang

et al. 2015

Environ. Sci. Technol.

175

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Ferrihydrite (Fh) supported Pt (Pt/Fh) catalyst was first prepared by combining microemulsion and NaBH4 reduction methods and investigated for room-temperature removal of formaldehyde (HCHO). It was found that the order of addition of Pt precursor and ferrihydrite in the preparation process has an important effect on the microstructure and performance of the catalyst. Pt/Fh was shown to be an efficient catalyst for complete oxidation of HCHO at room temperature, featuring higher activity than magnetite supported Pt (Pt/Fe3O4). Pt/Fh and Pt/Fe3O4 exhibited much higher catalytic activity than Pt supported over calcined Fh and TiO2. The abundance of surface hydroxyls, high Pt dispersion and excellent adsorption performance of Fh are responsible for superior catalytic activity and stability of the Pt/Fh catalyst. This work provides some indications into the design and fabrication of the cost-effective and environmentally benign catalysts with excellent adsorption and catalytic oxidation performances for HCHO removal at room temperature.

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“…Transformation rate is 1:1, which means that one mol produces one mol of carbon dioxide [9][10][11][12][13][14][15][16][17]. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…These parameters allowed calculating the photocatalytic activity of layers. The first derivate in x 0 point is: (2) This was used to calculate the maximum rate of chemical reaction [9][10][11][12][13][14].…”

Section: Resultsmentioning

confidence: 99%

A Statistical Study About Photocatalytic Properties of Titania Crystals Deposited by Sputtering

Vasilache¹,

Cretu²,

Sandu³

et al. 2017

Rev. Chim.

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Crystallized titania layers were prepared by vacuum sputtering in a DC magnetron. Photocatalytic properties of the crystals were analyzed using degradation of formaldehyde in a self-conception reactor. All data were analyzed using classical curve dependence and statistical. This study used Anova to find correlations between photocatalytic properties of the crystals and deposition parameters. The considered parameters were pressure, temperature of substrate, argon concentration and time of sputtering, all of this measured during the active process.

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Enhanced catalytic oxidation of formaldehyde over dual-site supported catalysts at ambient temperature

Cited by 25 publications

References 33 publications

Evaluating the Role of Descriptor- and Spectator-Type Reaction Intermediates During the Early Phases of Zeolite Catalysis

Evaluating the Role of Descriptor- and Spectator-Type Reaction Intermediates During the Early Phases of Zeolite Catalysis

Highly Active Mesoporous Ferrihydrite Supported Pt Catalyst for Formaldehyde Removal at Room Temperature

A Statistical Study About Photocatalytic Properties of Titania Crystals Deposited by Sputtering

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