Ozone-Assisted Catalysis of Toluene with Layered ZSM-5 and Ag/ZSM-5 Zeolites

Kim, Hyun‐Ha; Sugasawa, Masami; Hirata, Hiroshi; Teramoto, Yoshiyuki; Kosuge, Katsunori; Negishi, Nobuaki; Ogata, Atsushi

doi:10.1007/s11090-013-9487-z

Cited by 28 publications

(11 citation statements)

References 54 publications

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“…Furthermore, majority of detected byproducts in bare zeolites reaction were not found when Ag/HY catalysis was combined with NTP reaction in this study, because the metallic silver can decompose ozone and form active oxygen which was beneficial to deep oxidation of the reaction intermediates 42 . Furthermore, majority of detected byproducts in bare zeolites reaction were not found when Ag/HY catalysis was combined with NTP reaction in this study, because the metallic silver can decompose ozone and form active oxygen which was beneficial to deep oxidation of the reaction intermediates 42 .…”

Section: Ozonementioning

confidence: 74%

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Enhancement of the non-thermal plasma-catalytic system with different zeolites for toluene removal

Huang

Wang

et al. 2015

RSC Adv.

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Based on the important effect of catalyst on the plasma-catalytic system, various types of zeolites (5A, HZSM-5, Hβ, HY and Ag/HY) were chosen as catalysts to remove toluene under non-thermal plasma condition in this work. The results showed that all the zeolites, whether with toluene adsorption ability or not, significantly enhanced the toluene removal efficiency in the plasma discharge zone. Moreover, the carbon balance and CO 2 selectivity showed the same tendency of Ag/HY >HY > Hβ (HZSM-5)>5A, which was basically consistent with toluene adsorption ability, while opposed with the ozone emission. Loading silver on zeolite greatly decreased organic byproducts emission, and further improved the mineralization of toluene oxidation. At the same time, the intermediates including ringopening products on the catalyst surface were identified, and the pathways of toluene decomposition were proposed.

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Section: Ozonementioning

confidence: 74%

“…Moreover, Ag/HY exhibited better CO 2 selectivity than HY, displaying an important role of Ag in the decomposition of the surface intermediates 42 . Zeolite 5A showed excellent toluene removal efficiency, high ozone emission and low CO 2 selectivity.…”

Section: Ozonementioning

confidence: 99%

Enhancement of the non-thermal plasma-catalytic system with different zeolites for toluene removal

Huang

Wang

et al. 2015

RSC Adv.

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“…The multistage reactor can be described as a combination of more than one single-stage bed/reactor (Figure 2(c)). The multistage reactor gives a more flexible option in the industrialization of the plasma catalysis, attributing to the combination of catalysts with a different function for the expected reaction [38]. Chavade et al [39] used a four-stage plasma and catalytic reactor system for oxidation of benzene.…”

Section: Multistage Reactormentioning

confidence: 99%

Plasma-Enabled Dry Methane Reforming

Sheng¹,

Kameshima²,

Sakata³

et al. 2018

Plasma Chemistry and Gas Conversion

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Plasma-enabled dry methane reforming is a promising technology for biogas upgrade and shows multiple benefits to provide additional energy and material conversion pathways. This chapter first presents the role of nonthermal plasma as a potential energy supply pathway in the low-temperature methane conversion: an appropriated combination of electrical energy provided by plasma (ΔG) and the low-temperature thermal energy (TΔS) satisfies the overall reaction enthalpy (ΔH) with higher energy conversion efficiency. Moreover, plasma-enabled dry methane reforming could be operated at much lower temperature than thermal catalysis with sufficient material conversion. Three kinds of typical packed-bed plasma reactor were introduced to give a better understanding of the application of plasma and catalyst hybrid system. Subsequently, plasma-enabled dry methane reforming was diagnosed by pulsed reaction spectrometry compared with thermal catalysis, presenting a clear overview of gas component changes and significant promotion in reactant conversion and product yield. The interaction between plasma and catalyst was summarized based on two aspects: catalyst affects plasma, and plasma affects catalyst. We discussed the coke formation behavior of Ni/Al 2 O 3 catalyst in the plasma-enabled and thermal dry methane reforming, followed by the oxidation behavior. The interaction between plasma and catalyst pellets was discussed toward deeper insight into the mechanism.

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“…Ozone-based catalytic oxidation allows removing persistent VOCs from industrial emissions at room temperature, reducing operational cost [19][20][21][22]. Synthetic zeolites and metal-supported catalysts have been used as catalysts in the catalytic ozonation of VOCs [19,[23][24][25][26][27][28]. Additionally, natural zeolites have started to be applied in combination with ozone in this abatement process [29,30].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Ozonation of Toluene over Acidic Surface Transformed Natural Zeolite: A Dual-Site Reaction Mechanism and Kinetic Approach

2021

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Volatile organic compounds (VOCs) are responsible for damage to health due to their carcinogenic effects. Catalytic ozonation using zeolite appears as a valuable process to eliminate VOCs from industrial emissions at room temperature. For full-scale application of this new abatement technology, an intrinsic reaction rate equation is needed for an effective process design and scale-up. Results obtained here provide a mechanistic approach during the initial stage of catalytic ozonation of toluene using an acidic surface transformed natural zeolite. In particular, the contribution of Lewis and Brønsted acid sites on the surface reaction mechanism and overall kinetic rate are identified through experimental data. The least-squares non-linear regression method allows the rate-determining step to be established, following a Langmuir–Hinshelwood surface reaction approximation. Experimental evidence suggest that ozone is adsorbed and decomposed at Lewis acid sites, forming active atomic oxygen that leads to the oxidation of adsorbed toluene at Brønsted acid sites.

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Ozone-Assisted Catalysis of Toluene with Layered ZSM-5 and Ag/ZSM-5 Zeolites

Cited by 28 publications

References 54 publications

Enhancement of the non-thermal plasma-catalytic system with different zeolites for toluene removal

Enhancement of the non-thermal plasma-catalytic system with different zeolites for toluene removal

Plasma-Enabled Dry Methane Reforming

Catalytic Ozonation of Toluene over Acidic Surface Transformed Natural Zeolite: A Dual-Site Reaction Mechanism and Kinetic Approach

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