Catalytic Decomposition of Ozone in Ground Air by Manganese-Based Monolith Catalysts

Yu, Quanwei; Zhao, Ming; Liu, Zhimin; Zhang, Xiaoyu; Zheng, Lingmin; Chen, Yaoqiang; Gong, Maochu

doi:10.1016/s1872-2067(08)60082-0

Cited by 19 publications

(7 citation statements)

References 7 publications

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“…The concentration of undetectable ozone discharged from the catalyst bed was lower than the indoor air quality (IAQ) limit recommended by the Taiwan EPA (O 3 : 0.03 ppm-8 h average) (Taiwan EPA, 2005) and other standards from the USA (FDA: 0.05 ppm; OSHA: 0.10 ppm-8 h average; NIOSH: 0.10 ppm-any time; NAAQ: 0.08 ppm-maximum 8 h average) (US EPA, 1999), which suggests that the potential adverse health effects of exposure to such levels of ozone are insignificant. The results of efficacy of the two catalysts in the decomposition of ozone are similar to those of Dhandapani and Oyama (1997) and Yu et al (2009). It was demonstrated that catalytic decomposition is suitable for treating high concentrations of residual ozone discharged from the ozone disinfection system if the catalysts are selected correctly.…”

Section: Efficacy Of Catalytic Decomposition Of Ozonementioning

confidence: 67%

“…Unfortunately, this greatly limits the applicability of gaseous ozone for disinfection in indoor environments. Many studies (Dhandapani and Oyama, 1997;Naydenov et al, 2008;Yu et al, 2009) have indicated that catalysts comprising noble metals or oxides of metals and catalyst supports (e.g. -Al 2 O 3 , SiO 2 , TiO 2 and activated carbon) are able to decompose ozone with a high degree of efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Controlling Indoor Bioaerosols Using a Hybrid System of Ozone and Catalysts

Huang

Lee

Tai

2012

Aerosol Air Qual. Res.

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As people spend a greater portion of their time indoors, the likelihood of exposure to biohazards in indoor air is increasing. This study developed a system to disinfect indoor bioaerosols while protecting occupants from direct exposure to ozone. This hybrid approach combines high concentrations of ozone generated by a non-thermal dielectric barrier discharge system, and an ozone decomposition unit using MnO 2 /Al 2 O 3 and MnO 2 /AC catalysts. Four types of common bioaerosols were used to test the germicidal efficacy of 0-175 ppm ozone at a relative humidity of 30-70% and retention time of 1-10 s. The results indicate that the germicidal efficacy of ozone on E. coli, C. famata and P. citrinum spore bioaerosols increased with ozone concentration, relative humidity, and retention time; however, the process was less effective with the hardy endospores of B. subtilis. Germicidal efficacy of 90% was obtained for bioaerosols (two vegetative cells and one spore) using high concentrations of ozone at a relative humidity of 70% and exposure time of 10 s. Residual ozone in the tail gas was decomposed to undetectable levels using catalysts at a gas hourly space velocity of 3.287 × 10 3 1/h. The concentration of indoor bioaerosols (total bacteria and fungi) in a small office was reduced to below 50 CFU/m 3 and ozone in the tail gas was reduced to undetectable levels following treatment for 2 h. The hybrid system of ozone disinfection and catalysts provides high germicidal efficacy while protecting occupants from direct exposure to ozone.

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Section: Efficacy Of Catalytic Decomposition Of Ozonementioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Controlling Indoor Bioaerosols Using a Hybrid System of Ozone and Catalysts

Huang

Lee

Tai

2012

Aerosol Air Qual. Res.

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“…The main cause for this observation is that the competitive adsorption of water molecules and O 3 molecules on the catalyst surface and thus the occupation of active sites by water. [17,43] It should be noted that our structured Co-MnO x (0.36)-Al catalyst exhibits markedly improved moisture resistance for O 3 decomposition in comparison with powdered MnO 2 catalysts reported previously. [40] A possible explanation is that entirely open porous structure and thin catalyst layer (~1 μm, Figure S3) of our Co-MnO x (0.36)-Al catalyst show ability to weaken the capillary condensation of water.…”

Section: Effects Of O 3 Concentration Ghsv and Relative Humiditymentioning

confidence: 65%

High‐Performance Co‐MnO_x Composite Oxide Catalyst Structured onto Al‐Fiber Felt for High‐Throughput O₃ Decomposition

et al. 2019

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A highly active and efficient thin-felt Al-fiber-structured Co-MnO x composite oxide catalyst (named Co-MnO x -Al) with unique form factor and high permeability is developed for highthroughput catalytic decomposition of gaseous ozone (O 3 ). Thin-sheet Al-fiber felt (60 μm diameter; 90 vol % voidage) chips underwent a steam-only oxidation and calcination for endogenously growing a 0.7-μm-thick mesoporous layer of γ-Al 2 O 3 nanosheets along with the Al-fiber. Cobalt and manganese were placed onto the ns-γ-Al 2 O 3 /Al-fiber chips by incipient wetness co-impregnation method. The best catalyst is the one with a Co/Mn molar ratio of 0.36 and Co-Mn loading of 5 wt % after calcining at 500°C (named Co-MnO x (0.36)-Al), being able to achieve full O 3 conversion at 25°C for a feed gas containing 1000 � 30 ppm O 3 , using a high gas hourly space velocity of 48000 mL g cat.À 1 h À 1 ; full O 3 conversion is retained in the absence of moisture till the testing end after 720 min; in case with a relative humidity of 50 %, O 3 conversion slides from 88 % of the initial value to a flat of~66 % within 90 min. CoO x modification is paramount for improved formation of Mn 2 + species while leading to the highest fraction of (Mn 2 + + Mn 3 + ) in total (Mn 2 + + Mn 3 + + Mn 4 + ) and more oxygen vacancies on Co-MnO x (0.36)-Al catalyst surface.[a] L.

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“…Firstly, the ozone was introduced into the by-pass route I to steady the experimental parameters, and then it was introduced into the route II to test the performance of the ozone converter. The detailed information can be found in the literature [19]. The inlet and outlet ozone concentration were measured by an ozone analyzer (American 2B-technology 106-L with the precision: 0.1 ppb), the corresponding pressure and temperature were measured by pressure transducer (with the accuracy grade of 0.25%) and temperature gauges (with the precision:±0.5℃), respectively.…”

Section: Table 1 Range Of Design Conditions For Ozone Converters In mentioning

confidence: 99%

“…Set Researchers have proposed various ozone removal techniques for ozone removal, such as adsorption [15], thermal decomposition [16], electromagnetic radiation decomposition and catalytic decomposition [17,18]. Because of the efficiency and economy, catalytic decomposition of ozone is an ideal technique for indoor air purification [19]. Catalytic decomposition consist of thermal-catalytic decomposition and photocatalytic decomposition [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Removal of Ozone by Pd/ACFs and Optimal Design of Ozone Converter for Air Purification in Aircraft Cabin

Wang

et al. 2019

Civ Eng J

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Ozone in aircraft cabin can bring obvious adverse impact on indoor air quality and occupant health. The objective of this study is to experimentally explore the ozone removal performance of flat-type catalyst film by loading nanometer palladium on the activated carbon fibers (Pd/ACFs), and optimize the configuration of ozone converter to make it meet the design requirements. A one-through ozone removal unit with three different Pd/ACFs space was used to test the ozone removal performance and the flow resistance characteristic under various temperature and flow velocity. The results show that the ozone removal rate of the ozone removal unit with the Pd/ACFs space of 1.5 mm can reach 99% and the maximum pressure drop is only 1.9 kPa at the reaction temperature of 200℃. The relationship between pressure drop and flow velocity in the ozone removal unit has a good fit to the Darcy-Forchheimer model. An ozone converter with flat-type reactor was designed and processed based on the one-through ozone removal experiment, its ozone removal rate and maximum pressure drop were 97% and 7.51 kPa, separately, with the condition of 150℃ and 10.63 m/s. It can meet the design requirements of ozone converter for air purification and develop a healthier aircraft cabin environment.

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Catalytic Decomposition of Ozone in Ground Air by Manganese-Based Monolith Catalysts

Cited by 19 publications

References 7 publications

Controlling Indoor Bioaerosols Using a Hybrid System of Ozone and Catalysts

Controlling Indoor Bioaerosols Using a Hybrid System of Ozone and Catalysts

High‐Performance Co‐MnO_x Composite Oxide Catalyst Structured onto Al‐Fiber Felt for High‐Throughput O₃ Decomposition

Catalytic Removal of Ozone by Pd/ACFs and Optimal Design of Ozone Converter for Air Purification in Aircraft Cabin

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Catalytic Decomposition of Ozone in Ground Air by Manganese-Based Monolith Catalysts

Cited by 19 publications

References 7 publications

Controlling Indoor Bioaerosols Using a Hybrid System of Ozone and Catalysts

Controlling Indoor Bioaerosols Using a Hybrid System of Ozone and Catalysts

High‐Performance Co‐MnOx Composite Oxide Catalyst Structured onto Al‐Fiber Felt for High‐Throughput O3 Decomposition

Catalytic Removal of Ozone by Pd/ACFs and Optimal Design of Ozone Converter for Air Purification in Aircraft Cabin

Contact Info

Product

Resources

About

High‐Performance Co‐MnO_x Composite Oxide Catalyst Structured onto Al‐Fiber Felt for High‐Throughput O₃ Decomposition