Investigation of Catalytic Ozonation of Recalcitrant Organic Chemicals in Aqueous Solution over Various ZSM-5 Zeolites

Wang, Yandan; Ma, Wenfeng; Yoza, Brandon A.; Xu, Yingying; Li, Qing X.; Chen, Chunmao; Wang, Qinghong; Gao, Yu; Guo, Shaohui; Zhan, Yali

doi:10.3390/catal8040128

Cited by 9 publications

(12 citation statements)

References 43 publications

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“…[20] 29 Si solid-state NMR 29 Si solid-state NMR of zeolite-Y was done to assess the Si/Al ratio of the zeolite NaÀ Y catalyst. The deconvoluted 29 Si solid- The peaks obtained are in good agreement with the literature. [21] The peaks obtained at À 88.73, À 93.51, À 98.84, and À 104.72 correspond to Si(3Al), Si(2Al), Si(1Al), and Si(0Al), respectively.…”

Section: Thermogravimetric (Tga) Analysismentioning

confidence: 99%

Importance of the Nature of Acidic Sites of Different Aluminosilicates on Fixation of Carbon Dioxide with Styrene Oxide

Ramesh

Ray

2023

ChemPlusChem

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The nature of acidic sites in commercially available aluminosilicates, zeolite NaÀ Y, zeolite NH 4 + -ZSM-5, and as-synthesized Al-MCM-41 have been investigated by employing them as catalysts for capturing CO 2 by styrene oxide. The catalysts, in tandem with tetrabutylammonium bromide (TBAB), produce styrene carbonate, and the yield of the product is observed to be governed by the acidity of the catalysts and hence, the Si/Al ratio. All these aluminosilicate frameworks have been characterized by IR, BET, TGA, and XRD. XPS, NH 3 -TPD, and 29 Si solidstate NMR studies have been carried out to analyze the Si/Al ratio and the acidity of these catalysts. According to TPD studies, the number of weak acidic sites of these materials follow an order as NH 4 + -ZSM-5 < Al-MCM-41 < zeolite NaÀ Y, which is just in accordance with their Si/Al ratios and the yield of the cyclic carbonates obtained, i. e., 55.3 %, 68 %, and 75.4 % respectively. The TPD data and the yield of the product carried out with calcined zeolite NaÀ Y indicate that not only the weak acidic sites but also the role of strong acidic sites might appear crucial in the cycloaddition reaction.

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Section: Thermogravimetric (Tga) Analysismentioning

confidence: 99%

Importance of the Nature of Acidic Sites of Different Aluminosilicates on Fixation of Carbon Dioxide with Styrene Oxide

Ramesh

Ray

2023

ChemPlusChem

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“…Heterogeneous catalytic ozonation is a promising technology for the degradation and mineralization of refractory pollutants in an aqueous solution . The catalysts used for this purpose mainly include (1) metal oxides (e.g., MnO 2 , , Al 2 O 3 , , CeO 2 , , and FeOOH , ); (2) silicate materials (e.g., zeolite, , MCM-41, SBA-15, and cordierite); (3) metal and metal oxides-supported catalysts (e.g., Cu/Al 2 O 3 , MnO X /Al 2 O 3 , Co/AC, and FeOOH/Al 2 O 3 ); − and (4) activated carbon (AC). , Among these catalysts, γ-Al 2 O 3 -supported metal oxides show high activity for the catalytic oxidation of aromatic compounds and MnO 2 has an outstanding performance among the first transition metal. ,− The catalytic activity of MnO 2 is positively correlated with the number of surface hydroxyl groups and oxygen vacancies, and it can be improved by combining other metals such as Cu, Fe, and Ce oxides. , Li et al found that Cu/Mn-loaded γ-Al 2 O 3 showed enhanced catalytic activity for the removal of Acid Red B.…”

Section: Introductionmentioning

confidence: 99%

“…4 Heterogeneous catalytic ozonation is a promising technology for the degradation and mineralization of refractory pollutants in an aqueous solution. 5 The catalysts used for this purpose mainly include (1) metal oxides (e.g., MnO 2 , 6,7 Al 2 O 3 , 8,9 CeO 2 , 10,11 and FeOOH 12,13 ); (2) silicate materials (e.g., zeolite, 14,15 MCM-41, 16 SBA-15, 17 and cordierite 18 ); (3) metal and metal oxides-supported catalysts (e.g., Cu/Al 2 O 3 , MnO X /Al 2 O 3 , Co/AC, and FeOOH/Al 2 O 3 ); 19−22 and (4) activated carbon (AC). 23,24 Among these catalysts, γ-Al 2 O 3supported metal oxides show high activity for the catalytic oxidation of aromatic compounds and MnO 2 has an outstanding performance among the first transition metal.…”

Section: Introductionmentioning

confidence: 99%

Cu–MnO_X/γ-Al₂O₃ Catalyzed Ozonation of Nitrobenzene in a High-Gravity Rotating Packed Bed

Shao

Song

et al. 2021

Ind. Eng. Chem. Res.

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In this study, Cu−MnO X /γ-Al 2 O 3 catalyst was first used for heterogeneous catalytic ozonation of nitrobenzene (NB) in a high-gravity rotating packed bed (RPB), as RPB could significantly improve the mass transfer of ozone and thus contribute to the utilization efficiency of ozone and the degradation of NB. To illuminate the synergistic effect of RPB and heterogeneous catalytic ozonation, the degradation (η NB ) and mineralization (η TOC ) efficiency of NB as well as the utilization efficiency of ozone (Ru) in the RPB/O 3 , BR/O 3 (bubbling reactor), and RPB/O 3 /Cat. processes were compared. The results showed that the η NB and Ru of the RPB/O 3 system were more than twice compared to that of the BR/O 3 system due to the high mass transfer of ozone in the RPB. The use of Cu−MnO X /γ-Al 2 O 3 catalyst as a packing in the RPB/O 3 /Cat. system resulted in an increase in the mineralization of NB from 60.3 to 81.7%. Radical quenching tests confirmed that O 2•− and • OH were dominant reactive oxygen species, and O 2 •− played an important role in • OH generation. In conclusion, Cu−MnO X /γ-Al 2 O 3 -catalyzed ozonation and high gravity had a synergistic effect on • OH initiation and thus improved the degradation and mineralization of NB in an aqueous solution.

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“…The heterogeneous catalytic ozonation, utilizing several minerals as catalysts, has been previously reported to remove efficiently different emerging organic pollutants via the acceleration of hydroxyl radicals production [3]. Minerals, such as zeolite [4], anatase [5], kaolin [6] and calcite [7], are shown satisfactory performances as catalysts in this process.…”

Section: Introductionmentioning

confidence: 99%

Thermally Treated Zeolite as a Catalyst in Heterogeneous Catalytic Ozonation—Optimization of Experimental Conditions and Micropollutant Degradation

Zouboulis

Psaltou

Kaprara

et al. 2020

5th International Electronic Conference on Water Sciences

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Raw and thermally pre-treated zeolite, denoted as zeolite-T, were examined as catalysts in the heterogeneous catalytic ozonation process. Their catalytic activity was evaluated by the degradation of p-chlorobenzoic acid (p-CBA) at initial concentration 4 μΜ, a typical biorefractory organic model compound. The results showed that the thermally pre-treated zeolite presented higher catalytic activity, than the raw material. Rates of 99.3%, 98% and 94.5% degradation of p-CBA were achieved within 3 min of reaction/oxidation time, by applying the zeolite-T/O3, the zeolite/O3 and the single ozonation (O3) procedures, respectively, under comparable experimental conditions. After 15 min treatment time the concentration of p-CBA was found to be below the respective detection limit (0.025 μΜ) of the used analytical method (HPLC) for both catalytic processes, while the application of single ozonation reached to 0.16 μM residual concentration of p-CBA. The removal of p-CBA was also examined for different initial pH values commonly found in natural waters, as well as for different oxidation reaction temperatures. As optimum conditions were defined the pH value 8 and 25 o C, during which the production of hydroxyl radicals in the aqueous phase were found to be increased. Furthermore, the degradation of two other common micropollutants (i.e. benzotriazole and carbamazepine), which present different reaction rate constants with ozone (i.e. 20 M-1 s-1 and 3*10 5 M-1 s-1 , respectively) was additionally evaluated. It was found that all these micropollutants can be sufficiently removed by the catalytic ozonation system in the presence of zeolite-T. However, it is worth noting that carbamazepine can be also easily removed by the application of even simple ozonation and that the presence of catalyst just decreased the respective necessary oxidation time for sufficient removal. On the other hand, benzotriazole presented a lower ozone degradation rate, than the other micropollutants and during the early stage (i.e. after the 3 rd min) of the oxidation reaction it was found to be removed by 96.5%.

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Investigation of Catalytic Ozonation of Recalcitrant Organic Chemicals in Aqueous Solution over Various ZSM-5 Zeolites

Cited by 9 publications

References 43 publications

Importance of the Nature of Acidic Sites of Different Aluminosilicates on Fixation of Carbon Dioxide with Styrene Oxide

Importance of the Nature of Acidic Sites of Different Aluminosilicates on Fixation of Carbon Dioxide with Styrene Oxide

Cu–MnO_X/γ-Al₂O₃ Catalyzed Ozonation of Nitrobenzene in a High-Gravity Rotating Packed Bed

Thermally Treated Zeolite as a Catalyst in Heterogeneous Catalytic Ozonation—Optimization of Experimental Conditions and Micropollutant Degradation

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Investigation of Catalytic Ozonation of Recalcitrant Organic Chemicals in Aqueous Solution over Various ZSM-5 Zeolites

Cited by 9 publications

References 43 publications

Importance of the Nature of Acidic Sites of Different Aluminosilicates on Fixation of Carbon Dioxide with Styrene Oxide

Importance of the Nature of Acidic Sites of Different Aluminosilicates on Fixation of Carbon Dioxide with Styrene Oxide

Cu–MnOX/γ-Al2O3 Catalyzed Ozonation of Nitrobenzene in a High-Gravity Rotating Packed Bed

Thermally Treated Zeolite as a Catalyst in Heterogeneous Catalytic Ozonation—Optimization of Experimental Conditions and Micropollutant Degradation

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Product

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Cu–MnO_X/γ-Al₂O₃ Catalyzed Ozonation of Nitrobenzene in a High-Gravity Rotating Packed Bed