Ozone Decomposition over Alumina-Supported Copper, Manganese and Copper-Manganese Catalysts

Spasova, I.; Nikolov, P.; Mehandjiev, D.

doi:10.1080/01919510601111665

Cited by 50 publications

(18 citation statements)

References 9 publications

(12 reference statements)

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“…According to the literature [16,35], ozone decomposition follows the scheme: . These couples could be represented by the following model for the reaction mechanism:…”

Section: Reaction Mechanismmentioning

confidence: 99%

“…Among them, catalytic decomposition is the most widely used method, due to its advantages of mild reaction conditions, high efficiency and low cost. Numerous catalysts have been investigated, including transition metal oxides [14][15][16][17][18][19][20][21], activated carbon [22,23] and noble metals [24][25][26]. Among these catalysts, manganese oxides (MnO x ) usually show good catalytic performance in ozone decomposition.…”

Section: Introductionmentioning

confidence: 99%

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Decomposition of high-level ozone under high humidity over Mn–Fe catalyst: The influence of iron precursors

Lian

2015

Catalysis Communications

113

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a b s t r a c t a r t i c l e i n f oManganese-iron mixed oxide, an efficient and stable catalyst, has been successfully used in the decomposition of ozone. The influence of different iron precursors on the catalytic decomposition activity of high-level ozone under high-humidity over manganese-iron catalysts prepared using a hydrothermal approach was studied. The catalytic performance over MnFe 0.5 O x -Fe(NO 3 ) 3 was much better than that of MnFe 0.5 O x -FeSO 4 and MnFe 0.5 O x -FeCl 3 . From the results of characterization by N 2 physical adsorption, XRD, XPS and SEM, it was concluded that the largest specific surface area, the lowest crystallinity, the most evenly distributed particle size and the most surface-active Mn 2+ and Mn 3+ led to the best catalytic activity for the MnFe 0.5 O x -Fe(NO 3 ) 3 catalyst.

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“…According to the literature [16,35], ozone decomposition follows the scheme: . These couples could be represented by the following model for the reaction mechanism:…”

Section: Reaction Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Decomposition of high-level ozone under high humidity over Mn–Fe catalyst: The influence of iron precursors

Lian

2015

Catalysis Communications

113

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“…5 mm) activated by concentrated hydrochloric acid. Ozone trapping is based on the catalytic activity of Cu(II) compounds, in particular, CuCl 2 formed in the reaction with HCl from CuO deposited on the copper tube walls (Rakitskaya et al 2006;Spasova et al 2007). In our setup, ambient ozone concentrations were reduced from the level of 25-50 nmol mol -1 to ca.…”

Section: Study Site and Foliage Samplingmentioning

confidence: 99%

Can the capacity for isoprene emission acclimate to environmental modifications during autumn senescence in temperate deciduous tree species Populus tremula?

2011

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Changes in isoprene emission (Φ(isoprene)), and foliage photosynthetic (A) rates, isoprene precursor dimethylallyldiphosphate (DMADP), and nitrogen and carbon contents were studied from late summer to intensive leaf fall in Populus tremula to gain insight into the emission controls by temperature and endogenous, senescence-induced, modifications. Methanol emissions, characterizing degradation of cell wall pectins, were also measured. A rapid reduction in Φ(isoprene) and A of 60-70% of the initial value was observed in response to a rapid reduction of ambient temperature by ca. 15°C (cold stress). Later phases of senescence were associated with further reductions in Φ(isoprene) and A, with simultaneous major decrease in nitrogen content. However, during episodes of temperature increase, A and in particular, Φ(isoprene) partly recovered. Variation in Φ(isoprene) during senescence was correlated with average temperature of preceding days, with the highest degree of explained variance observed with average temperature of 6 days. Throughout the study, methanol emissions were small, but a large burst of methanol emission was associated with leaf yellowing and abscission. Overall, these data demonstrate that the capacity for isoprene emission can adjust to environmental conditions in senescing leaves as well, but the responsiveness is low compared with mid-season and is also affected by stress.

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“…[1,[20][21][22] Moreover, in comparison with the pure manganese oxides, the ones modified with other metals or oxides seem to exhibit higher activity due to the interactions between manganese oxides and modifiers. [23] with a RH of 65 %, using a space velocity of 840 L g cat. À 1 h À 1 .…”

Section: Introductionmentioning

confidence: 99%

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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Ozone Decomposition over Alumina-Supported Copper, Manganese and Copper-Manganese Catalysts

Cited by 50 publications

References 9 publications

Decomposition of high-level ozone under high humidity over Mn–Fe catalyst: The influence of iron precursors

Decomposition of high-level ozone under high humidity over Mn–Fe catalyst: The influence of iron precursors

Can the capacity for isoprene emission acclimate to environmental modifications during autumn senescence in temperate deciduous tree species Populus tremula?

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

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Ozone Decomposition over Alumina-Supported Copper, Manganese and Copper-Manganese Catalysts

Cited by 50 publications

References 9 publications

Decomposition of high-level ozone under high humidity over Mn–Fe catalyst: The influence of iron precursors

Decomposition of high-level ozone under high humidity over Mn–Fe catalyst: The influence of iron precursors

Can the capacity for isoprene emission acclimate to environmental modifications during autumn senescence in temperate deciduous tree species Populus tremula?

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

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