Ozone decomposition on ZnO catalysts obtained from different precursors

Milenova, Katya; Nikolov, P.; Kasabova, N.; Avramova, I.

doi:10.2478/pjct-2014-0070

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…Higher conversion after adding ZnO onto the catalysts occurred because the characteristic of ZnO as a donor and acceptor. ZnO had many defect sites like oxygen vacancies [4]. Oxygen vacancies were important parts of ZnO structure because those were the place for ozone to be absorbed and oxygen to be desorbed from catalysts.…”

Section: Resultsmentioning

confidence: 99%

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Preparation of zinc oxide catalyst with activated carbon support for ozone decomposition

Pradyasti

Azhariyah

Karamah³

et al. 2018

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. Investigation of catalyst for ozone decomposition was carried out by using zinc oxide (ZnO) catalyst and granular activated carbon (GAC) support. Ozone needs to be decomposed because it is harmful to human and can lead to death. Before GAC was used as a support, GAC was pre-treated using chloride acid (HCl) and sodium hydroxide (NaOH) to remove impurities. ZnO was impregnated onto the surface of GAC by using zinc carbonate (ZnCO3) solution as precursor and then calcined at 300 °C to decompose carbon dioxide (CO2). Size of GAC and loading percentage of ZnO were varied to get the highest catalytic activity. Size of GAC was varied between 18 -100 mesh and loading percentage was between 0 -2%-w. The morphology, composition, and crystal phase were characterized by BET, SEM-EDX, and XRD method. From XRD method, crystal phase of catalyst was changed from ZnCO3 structure to ZnO when calcined with exact temperature. Ozone decomposition was performed at room temperature and atmospheric pressure using fixed bed reactor. ZnO/GAC with smallest size (60 -100 mesh) and highest loading percentage (2%-w) showed the highest activity which the conversion reached 100% for 30 minutes. ZnO/GAC with smallest size and highest loading percentage had the largest surface area and the most active sites to decompose ozone.

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Section: Resultsmentioning

confidence: 99%

“…Metal that can be used for catalyst are platina and palladium, whereas for metal oxide are manganese oxide, cobalt oxide, nickel oxide, silver oxide, and zinc oxide [3]. ZnO is chosen for this investigation because it is cheap and has good catalytic activity [4]. Catalyst support is used to get higher conversion of ozone decomposition.…”

Section: Introductionmentioning

confidence: 99%

Preparation of zinc oxide catalyst with activated carbon support for ozone decomposition

Pradyasti

Azhariyah

Karamah³

et al. 2018

IOP Conf. Ser.: Earth Environ. Sci.

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“…Although noble metal catalysts such as Pt, Pd, Au, and Ag have demonstrated excellent performance for catalyzing ozone decomposition, their high cost discourages their wide application. Therefore, the transition metal oxide catalysts were mainly developed due to their lower prices, larger reserves, and good activity. − In particular, manganese oxide catalysts shown excellent activity in removing ozone under mild conditions and have been extensively reported and modified to improve their performance, such as Ce-OMS-2, H-MnO 2 , Li-K-OMS-2, and MnO 2 @GR . Nonetheless, manganese-based catalysts still have the problem that oxygen-containing species (e.g., O 2 – , O 2 2– , and H 2 O) occupy the active site (oxygen vacancy) and lead to catalyst deactivation. − Recently, some layered double hydroxides (LDHs) and layered double oxides derived from LDH were developed to eliminate ozone, − and especially, the NiFe-LDH catalyst exhibited outstanding performance and promising application potential for removing ozone.…”

Section: Introductionmentioning

confidence: 99%

Effect of Interlayer Anions on NiFe Layered Double Hydroxides for Catalytic Ozone Decomposition

Wang,

Li,

et al. 2024

Environ. Sci. Technol.

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NiFe layered double hydroxides (NiFe-LDH) exhibited an outstanding performance and promising application potential for removing ozone. However, the effect of interlayer anions on ozone removal remains ambiguous. Here, a series of NiFe-LDH with different interlayer anions (F − , Cl − , Br − , NO 3 − , CO 3 2− , and SO 4 2−) were prepared to investigate the effect of the interlayer anion on ozone removal for the first time. It was found that the interlayer anions are a key factor affecting the water resistance of the NiFe-LDH catalyst under moist conditions. NiFe-LDH-CO 3 2− exhibited the best water resistance, which was much better than that of NiFe-LDH containing other interlayer anions. The in situ DIRFTS demonstrates that the carbonates in the interlayer of NiFe-LDH-CO 3 2− will undergo coordination changes through the interaction with water molecules under moist conditions, exposing new metal sites. As a result, the newly exposed metal sites could activate water molecules into hydroxyl groups that act as active sites for catalyzing ozone decomposition. This work provides a new insight into the interlayer anions of LDH, which is important for the design and development of LDH catalysts with excellent ozone removal properties.

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“…Nevertheless, radiation of short wavelength might activate the bond between oxygen molecules and produce even more ozone [22][23][24]. Thus, scientists have come up with a promising way to remove indoor ozone, that is, catalytic decomposition [25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Visible-Light Photocatalyst to Remove Indoor Ozone under Ambient Condition

Chang

2021

Catalysts

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Ozone is a kind of hazardous gas in indoor areas and needs to be removed in order to protect the human respiratory system. Previous methods include physical adsorption, thermal treatment, electromagnetic radiation removal, catalysis and photocatalysis. However, they all have limited effects. This research introduced a novel milestone to remove indoor ozone by utilizing visible light photocatalysis technique under ambient condition. The modified sol–gel method was applied to prepare photocatalysts, strontium titanate (SrTiO3) and rhodium-doped strontium titanate (SrTiO3:Rh). In addition, the SrTiO3:Rh was further immersed in N3 dye to improve its photocatalytic performance. Batch system and continuous-flow system were used to quantify the removal rate of ozone and to measure the conversions of ozone, respectively. The results showed that SrTiO3:Rh possessed a higher ozone removal rate under a visible light condition compared with a commercial P25 TiO2 catalyst. In addition, SrTiO3:Rh based catalysts can also successfully perform visible light ozone photodecomposition in the continuous ozone flow system. Note that current ozone converters in aircraft utilize thermal-catalysts, which can only be operated at high temperature. This research reveals a promising catalysts and photo process, which can possibly replace the current aircraft ozone converters with visible-light driven converters, and boast higher performance under ambient condition.

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Ozone decomposition on ZnO catalysts obtained from different precursors

Cited by 7 publications

References 24 publications

Preparation of zinc oxide catalyst with activated carbon support for ozone decomposition

Preparation of zinc oxide catalyst with activated carbon support for ozone decomposition

Effect of Interlayer Anions on NiFe Layered Double Hydroxides for Catalytic Ozone Decomposition

Visible-Light Photocatalyst to Remove Indoor Ozone under Ambient Condition

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