To enhance water resistance for catalytic ozone decomposition by fabricating H2O adsorption-site in OMS-2 tunnels

2021 ◽  
pp. 120466
Author(s):  
Wei Hong ◽  
Jinzhu Ma ◽  
Tianle Zhu ◽  
Hong He ◽  
Haining Wang ◽  
...  
Keyword(s):  
Water Resistance ◽  
Adsorption Site ◽  
Ozone Decomposition ◽  
Catalytic Ozone

scholarly journals Encapsulate α-MnO2 nanofiber within graphene layer to tune surface electronic structure for efficient ozone decomposition

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Guoxiang Zhu ◽  
Wei Zhu ◽  
Yang Lou ◽  
Jun Ma ◽  
Wenqing Yao ◽  
...  
Keyword(s):  
Graphene Layer ◽  
Water Resistance ◽  
Catalyst Design ◽  
Ozone Decomposition ◽  
Oxygen Species ◽  
Ozone Molecule ◽  
Practical Application ◽  
Surface Electronic Structure ◽  
Reaction Barriers ◽  
Excellent Stability

AbstractMajor challenges encountered when developing manganese-based materials for ozone decomposition are related to the low stability and water inactivation. To solve these problems, a hierarchical structure consisted of graphene encapsulating α-MnO2 nanofiber was developed. The optimized catalyst exhibited a stable ozone conversion efficiency of 80% and excellent stability over 100 h under a relative humidity (RH) of 20%. Even though the RH increased to 50%, the ozone conversion also reached 70%, well beyond the performance of α-MnO2 nanofiber. Here, surface graphite carbon was activated by capturing the electron from inner unsaturated Mn atoms. The excellent stability originated from the moderate local work function, which compromised the reaction barriers in the adsorption of ozone molecule and the desorption of the intermediate oxygen species. The hydrophobic graphene shells hindered the chemisorption of water vapour, consequently enhanced its water resistance. This work offered insights for catalyst design and would promote the practical application of manganese-based catalysts in ozone decomposition.

Facile synthesis of Ag-modified manganese oxide for effective catalytic ozone decomposition

2019 ◽  
Vol 80 ◽  
pp. 159-168 ◽  
Author(s):  
Xiaotong Li ◽  
Jinzhu Ma ◽  
Changbin Zhang ◽  
Runduo Zhang ◽  
Hong He
Keyword(s):  
Manganese Oxide ◽  
Ozone Decomposition ◽  
Facile Synthesis ◽  
Catalytic Ozone

scholarly journals Highly active OMS-2 for catalytic ozone decomposition under humid conditions

2019 ◽  
Vol 16 (4) ◽  
pp. 912-919 ◽  
Author(s):  
Bo Peng ◽  
Wenjing Bao ◽  
Linlin Wei ◽  
Runduo Zhang ◽  
Zhoujun Wang ◽  
...  
Keyword(s):  
Ozone Decomposition ◽  
Highly Active ◽  
Catalytic Ozone

Oxidation of polycyclic aromatic hydrocarbons by ozone in the presence of sand

2001 ◽  
Vol 43 (5) ◽  
pp. 349-356 ◽  
Author(s):  
H. Choi ◽  
Y.-Y. Kim ◽  
H. Lim ◽  
J. Cho ◽  
J.-W. Kang ◽  
...  
Keyword(s):  
Removal Rate ◽  
Oh Radicals ◽  
Ozone Decomposition ◽  
Oh Radical ◽  
Soil Slurry ◽  
Experimental Conditions ◽  
Polycyclic Aromatic ◽  
Soil Media ◽  
The Given ◽  
Catalytic Ozone

A series of soil slurry experiments was performed to investigate the characteristics of PAHs removal by ozone in various conditions. Gaseous ozone was bottled into the aqueous phase in the presence of soil contaminated by PAHs. The effects of soil media, OH radical scavengers, ozone dosage, and humic acid were examined at the given experimental conditions. There exists a substantial difference in the removal of PAH according to the types of soil media tested. Baked sand showed the highest removal efficiency compared to the others. The descending order of removal rate was: BS>S>GB. This is considered to be due to the OH radical effect produced by catalytic reactions of ozone with the reactive site on the and. This is qualitatively proved by the experiment of scavenging OH radicals using tert-butanol. The comparison of half-lives of ozone in sand and glass bead columns further supports this hypothesis. It was found that about 22% of enhancement of phenanthrene destruction was accomplished by OH radicals produced by the catalytic ozone decomposition. The rate of ozone consumption for the phenanthrene oxidation was obtained as 1.88 mg/mgO3/min.

scholarly journals Ozone decomposition

2014 ◽  
Vol 7 (2) ◽  
pp. 47-59 ◽  
Author(s):  
Todor Batakliev ◽  
Vladimir Georgiev ◽  
Metody Anachkov ◽  
Slavcho Rakovsky ◽  
Slavcho Rakovsky
Keyword(s):  
Noble Metals ◽  
Toxic Substance ◽  
Chemical Properties ◽  
Precious Metals ◽  
Catalytic Decomposition ◽  
High Price ◽  
Catalyst Characterization ◽  
Ozone Decomposition ◽  
Considerable Work ◽  
Catalytic Ozone

ABSTRACT Catalytic ozone decomposition is of great significance because ozone is a toxic substance commonly found or generated in human environments (aircraft cabins, offices with photocopiers, laser printers, sterilizers). Considerable work has been done on ozone decomposition reported in the literature. This review provides a comprehensive summary of the literature, concentrating on analysis of the physico-chemical properties, synthesis and catalytic decomposition of ozone. This is supplemented by a review on kinetics and catalyst characterization which ties together the previously reported results. Noble metals and oxides of transition metals have been found to be the most active substances for ozone decomposition. The high price of precious metals stimulated the use of metal oxide catalysts and particularly the catalysts based on manganese oxide. It has been determined that the kinetics of ozone decomposition is of first order importance. A mechanism of the reaction of catalytic ozone decomposition is discussed, based on detailed spectroscopic investigations of the catalytic surface, showing the existence of peroxide and superoxide surface intermediates

Manganese-based layered double hydroxide nanoparticles as highly efficient ozone decomposition catalysts with tunable valence state

Nanoscale ◽  
2020 ◽  
Vol 12 (24) ◽  
pp. 12817-12823
Author(s):  
Siyu Wang ◽  
Yu-quan Zhu ◽  
Yuhong Zhang ◽  
Binxia Wang ◽  
Hong Yan ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Valence State ◽  
Ozone Decomposition ◽  
Highly Efficient ◽  
Valence States ◽  
Double Hydroxide ◽  
Catalytic Ozone ◽  
Layered Double Hydroxide Nanoparticles

This paper reported a Mn based layered double hydroxide catalyst with tunable valence state, and the effects of different valence states on catalytic ozone decomposition.

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