Catalyst tolerance to SO<sub>2</sub>and water vapor of Mn based bimetallic oxides for NO deep oxidation by ozone

Lin, Fawei; Wang, Zhihua; Shao, Jiaming; Yuan, Dingkun; He, Yong; Zhu, Yanqun; Cen, Kefa

doi:10.1039/c7ra04010e

Cited by 8 publications

(3 citation statements)

References 51 publications

(68 reference statements)

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“…To investigate the valance state of the elemental species on the catalyst surface, the XPS spectra of five fresh catalysts, i.e., 10%Mn/HZSM(27), 10%Mn/HZSM(117), 10%Mn/HZSM(200), 10%Fe/HZSM(200), and 0.75%Pt–10% Fe/HZSM(200) were tested. The bands in the Mn 2p 3/2 spectra in Figure 5 a were deconvoluted into two Gaussian components, corresponding to Mn 3+ and Mn 4+ from low to high binding energy [ 21 , 22 ]. Table 2 reports the binding energy position of each peak and the proportion of the Mn valence states.…”

Section: Resultsmentioning

confidence: 99%

Low-Temperature Catalytic Ozonation of Multitype VOCs over Zeolite-Supported Catalysts

Shao

Zhai

et al. 2022

IJERPH

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Volatile organic compounds (VOCs) are an important source of air pollution, harmful to human health and the environment, and important precursors of secondary organic aerosols, O3 and photochemical smog. This study focused on the low-temperature catalytic oxidation and degradation of benzene, dichloroethane, methanethiol, methanol and methylamine by ozone. Benzene was used as a model compound, and a molecular sieve was selected as a catalyst carrier to prepare a series of supported active metal catalysts by impregnation. The effects of ozone on the catalytic oxidation of VOCs and catalysts’ activity were studied. Taking benzene as a model compound, low-temperature ozone catalytic oxidation was conducted to explore the influence of the catalyst carrier, the active metal and the precious metal Pt on the catalytic degradation of benzene. The optimal catalyst appeared to be 0.75%Pt–10%Fe/HZSM(200). The catalytic activity and formation of the by-products methylamine, methanethiol, methanol, dichloroethane and benzene over 0.75%Pt–10%Fe/HZSM(200) were investigated. The structure, oxygen vacancy, surface properties and surface acidity of the catalysts were investigated. XRD, TEM, XPS, H2-TPR, EPR, CO2-TPD, BET, C6H6-TPD and Py-IR were combined to establish the correlation between the surface properties of the catalysts and the degradation activity.

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Section: Resultsmentioning

confidence: 99%

Low-Temperature Catalytic Ozonation of Multitype VOCs over Zeolite-Supported Catalysts

Shao

Zhai

et al. 2022

IJERPH

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“…Although promises have seen in some TMOs, problems still exist such as the controversial reaction mechanism, low water vapor, and sulfur resistance. Therefore, it is necessary to explore appropriate preparation methods, suitable modified ions, and the optimal ratios to synthesize novel TMOs with excellent resistance to water vapor and sulfur poisoning, guided by the reaction mechanism ( Lin et al, 2017 ; Chen et al, 2022 ).…”

Section: Perspectivesmentioning

confidence: 99%

Recent progress of catalytic methane combustion over transition metal oxide catalysts

et al. 2022

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Methane (CH4) is one of the cleanest fossil fuel resources and is playing an increasingly indispensable role in our way to carbon neutrality, by providing less carbon-intensive heat and electricity worldwide. On the other hand, the atmospheric concentration of CH4 has raced past 1,900 ppb in 2021, almost triple its pre-industrial levels. As a greenhouse gas at least 86 times as potent as carbon dioxide (CO2) over 20 years, CH4 is becoming a major threat to the global goal of deviating Earth temperature from the +2°C scenario. Consequently, all CH4-powered facilities must be strictly coupled with remediation plans for unburned CH4 in the exhaust to avoid further exacerbating the environmental stress, among which catalytic CH4 combustion (CMC) is one of the most effective strategies to solve this issue. Most current CMC catalysts are noble-metal-based owing to their outstanding C–H bond activation capability, while their high cost and poor thermal stability have driven the search for alternative options, among which transition metal oxide (TMO) catalysts have attracted extensive attention due to their Earth abundance, high thermal stability, variable oxidation states, rich acidic and basic sites, etc. To date, many TMO catalysts have shown comparable catalytic performance with that of noble metals, while their fundamental reaction mechanisms are explored to a much less extent and remain to be controversial, which hinders the further optimization of the TMO catalytic systems. Therefore, in this review, we provide a systematic compilation of the recent research advances in TMO-based CMC reactions, together with their detailed reaction mechanisms. We start with introducing the scientific fundamentals of the CMC reaction itself as well as the unique and desirable features of TMOs applied in CMC, followed by a detailed introduction of four different kinetic reaction models proposed for the reactions. Next, we categorize the TMOs of interests into single and hybrid systems, summarizing their specific morphology characterization, catalytic performance, kinetic properties, with special emphasis on the reaction mechanisms and interfacial properties. Finally, we conclude the review with a summary and outlook on the TMOs for practical CMC applications. In addition, we also further prospect the enormous potentials of TMOs in producing value-added chemicals beyond combustion, such as direct partial oxidation to methanol.

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“…Temperature is critical for N2O5 formation [13] and catalyst activity. Because of the better resistance to SO2 and water vapor [38], Ce-Mn/SA was used to study the effect of reaction temperature on catalytic activity. The concentration of NO + NO2 varied with time at different temperatures as shown in Fig.…”

Section: Effect Of Reaction Temperature On Catalytic Activitymentioning

confidence: 99%

Promotional effect of spherical alumina loading with manganese-based bimetallic oxides on nitric-oxide deep oxidation by ozone

Lin

Wang

Shao

et al. 2017

Chinese Journal of Catalysis

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Catalyst tolerance to SO₂and water vapor of Mn based bimetallic oxides for NO deep oxidation by ozone

Abstract: Improving the catalyst stabilities under different conditions (water vapor, SO2, both water vapor and SO2) is important for industrial applications regarding catalytic NO deep oxidation by ozone.

Cited by 8 publications

References 51 publications

Low-Temperature Catalytic Ozonation of Multitype VOCs over Zeolite-Supported Catalysts

Low-Temperature Catalytic Ozonation of Multitype VOCs over Zeolite-Supported Catalysts

Recent progress of catalytic methane combustion over transition metal oxide catalysts

Promotional effect of spherical alumina loading with manganese-based bimetallic oxides on nitric-oxide deep oxidation by ozone

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Catalyst tolerance to SO2and water vapor of Mn based bimetallic oxides for NO deep oxidation by ozone

Abstract: Improving the catalyst stabilities under different conditions (water vapor, SO2, both water vapor and SO2) is important for industrial applications regarding catalytic NO deep oxidation by ozone.

Cited by 8 publications

References 51 publications

Low-Temperature Catalytic Ozonation of Multitype VOCs over Zeolite-Supported Catalysts

Low-Temperature Catalytic Ozonation of Multitype VOCs over Zeolite-Supported Catalysts

Recent progress of catalytic methane combustion over transition metal oxide catalysts

Promotional effect of spherical alumina loading with manganese-based bimetallic oxides on nitric-oxide deep oxidation by ozone

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Catalyst tolerance to SO₂and water vapor of Mn based bimetallic oxides for NO deep oxidation by ozone