Synthesis of a novel highly dispersed manganese oxide on porous calcium silicate for catalytic oxidation of toluene

2022 ◽  
Author(s):  
ziqiang wang ◽  
zhifei hao ◽  
yinmin zhang ◽  
junmin sun ◽  
Yongfeng Zhang
Keyword(s):  
Manganese Oxide ◽  
Catalytic Oxidation ◽  
Calcium Silicate ◽  
Manganese Oxides ◽  
Manganese Acetate ◽  
Impregnation Method ◽  
Manganese Nitrate ◽  
Highly Dispersed

Herein, a series of novel porous calcium silicate (PCS)-supported manganese oxides (MnOx) catalysts are first prepared by impregnation method using three different manganese precursors (manganese acetate, manganese nitrate and manganese...

Preparation and Characterization of MnOX-CeO2/TiO2 Catalytic Material for SCR of NOX with NH3 at Low Temperature

2013 ◽  
Vol 743-744 ◽  
pp. 198-203
Author(s):  
Qi Dong Liu ◽  
Su Ping Cui ◽  
Hong Xia Guo ◽  
Ya Li Wang ◽  
Yun Feng Zhang
Keyword(s):  
Low Temperature ◽  
Surface Concentration ◽  
Manganese Chloride ◽  
Molar Ratio ◽  
Manganese Acetate ◽  
Impregnation Method ◽  
Manganese Nitrate ◽  
Catalytic Materials ◽  
Scr Of No ◽  
Catalytic Material

The MnOX-CeO2/TiO2 catalytic material for low temperature SCR of NOX with NH3 was prepared using aqueous solutions of three manganese salt as well as cerous nitrate and TiO2(anatase) powder by impregnation method. The properties of the catalytic materials were investigated by TG-DSC, XRF, XRD, XPS, BET and SEM. And the low temperature catalytic activity of the catalytic materials was measured. The results showed that, when manganese nitrate and manganese chloride and manganese acetate were used as precursors, respectively, the primary phases of catalytic materials were MnOx/MnO2, MnO2/Mn8O10Cl3 and Mn3O4/MnO2, the surface Mn/Ti molar ratio were 0.68, 0.19 and 0.88, the surface area were 45.1m2/g, 25.1 m2/g and 48.6 m2/g ,respectively. The optimum NOX conversion rate of catalytic material from manganese nitrate precursor and manganese chloride precursor and manganese acetate precursor were 97.9% at 483K, 86.6% at 513K, 97.2% at 423K, respectively. Consequently, the higher low-temperature activity of MnOX-CeO2/TiO2 from manganese acetate precursor may be attributed to higher surface and higher surface concentration of activity component.

Solution-Based Synthesis of Manganese Oxide Cathodes for Lithium Batteries

1999 ◽  
Vol 575 ◽  
Author(s):  
A. Manthiram ◽  
J. Kim ◽  
S. Choi
Keyword(s):  
Manganese Oxide ◽  
Lithium Batteries ◽  
Manganese Oxides ◽  
Oxygen Vacancies ◽  
Critical Role ◽  
Manganese Acetate ◽  
Oxide Cathodes ◽  
V Region ◽  
Amorphous Manganese Oxide ◽  
Acetonitrile Medium

ABSTRACTWith an objective to overcome the cyclability problems of manganese oxides, solution-based procedures are pursued to synthesize metastable manganese oxides. Reduction of permanganate with lithium iodide in an acetonitrile medium followed by heating at 250 °C in vacuum gives an amorphous lithium sodium manganese oxyiodide that is intimately mixed with crystalline NaIO3. On the other hand, oxidation of manganese acetate with lithium or hydrogen peroxide in presence of lithium hydroxide followed by firing at T < 500 °C gives the metastable spinel oxides, Li4Mn5O12 and Li2Mn4O9-δ. The amorphous manganese oxide exhibits excellent cyclability with a capacity > 275 mAh/g at 4.3-1.5 V. The presence of NaIO3 and a unique microstructure are found to play a critical role in the electrochemical properties. Although Li4Mn5O12 could be achieved without much oxygen vacancies, Li2Mn4O9-δ has significant amount of oxygen vacancies with δ > 0.35. Both Li4Mn5O12 and Li2Mn4O9-δ exhibit capacities around 150 mAh/g with good cyclability in the 3 V region.

Peroxymonosulfate activation and pollutants degradation over highly dispersed CuO in manganese oxide octahedral molecular sieve

2017 ◽  
Vol 422 ◽  
pp. 754-762 ◽  
Author(s):  
Jun Li ◽  
Peng Ye ◽  
Jia Fang ◽  
Manye Wang ◽  
Deming Wu ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Molecular Sieve ◽  
Highly Dispersed

Mn3O4 doped with highly dispersed Zr species: a new non-noble metal oxide with enhanced activity for three-way catalysis

2016 ◽  
Vol 40 (12) ◽  
pp. 10108-10115 ◽  
Author(s):  
Genyuan Zhao ◽  
Jing Li ◽  
Wenshuang Zhu ◽  
Xueqin Ma ◽  
Yonghua Guo ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Manganese Oxide ◽  
Noble Metal ◽  
Storage Capacity ◽  
Catalytic Properties ◽  
Oxygen Storage Capacity ◽  
Oxide Catalysts ◽  
Oxygen Storage ◽  
Highly Dispersed ◽  
Three Way Catalysis

Herein, we demonstrate the influence of zirconium species on promoting the oxygen storage capacity and three-way catalytic properties of zirconium-manganese oxide catalysts.

Nickle Oxide Regulating Surface Oxygen to Promote Formaldehyde Oxidation on Manganese Oxide Catalyst

2021 ◽  
Author(s):  
Hailin Zhao ◽  
Jie Tang ◽  
Zengyuan Li ◽  
Jie Yang ◽  
Hao Liu ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
High Activity ◽  
Catalytic Oxidation ◽  
Oxide Catalyst ◽  
Low Cost ◽  
Surface Oxygen ◽  
Formaldehyde Oxidation ◽  
Type Semiconductor ◽  
Manganese Oxide Catalyst ◽  
P Type

Catalytic oxidation is the most effective method to eliminate the in-door formaldehyde, the Mn-based catalyst with low cost and high activity has drawn great attention. Herein, p-type semiconductor NiO doped...

scholarly journals Catalytic Activity Of Cu/η-Al2O3 Catalysts Prepared From Aluminum Scraps In The NH3-SCO and in the NH3-SCR of NO

2021 ◽  
Author(s):  
Nawel Jr ◽  
Thabet Makhlouf ◽  
Gerard Delahay ◽  
Hassib Tounsi
Keyword(s):  
Catalytic Oxidation ◽  
Catalytic Reduction ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Reduction Of No ◽  
Evaporation Method ◽  
Nh3 Scr ◽  
Scr Of No ◽  
Selective Catalytic Oxidation ◽  
Wet Impregnation Method

Abstract Copper loaded η-alumina catalysts with different copper contents have been prepared by impregnation/evaporation method. The catalysts were characterized by XRD, FTIR, BET, UV–vis, H2-TPR and evaluated in the selective catalytic reduction of NO by NH3 and in the selective catalytic oxidation of NH3. The characterization techniques showed that the impregnation/evaporation method permits to obtain highly dispersed copper oxide species on the η-alumina surface when low amount of copper is used (1wt. % and 2 wt.%). The wet impregnation method made it possible to reach a well dispersion of the copper species on the surface of the alumina for the low copper contents Cu(1)-Al2O3 and Cu(2)-Al2O3. The latter justifies the similar behavior of Cu(1)-Al2O3) and Cu(2)-Al2O3 in the selective catalytic oxidation of NH3 where these catalysts exhibit a conversion of NH3 to N2 of the order of 100% at T > 500°C.

LaOx Modified MnOx Loaded Biomass Activated Carbon and its Enhanced Performance for Simultaneous Abatement of NO and Hg0

2021 ◽  
Author(s):  
Lei Yi ◽  
Jinke Xie ◽  
Caiting Li ◽  
Jian Shan ◽  
Yingyun Liu ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Activated Carbons ◽  
Active Oxygen Species ◽  
Physicochemical Characterization ◽  
Acid Sites ◽  
Superior Performance ◽  
Bet Surface Area ◽  
Impregnation Method ◽  
Oxidation Activity ◽  
No Removal

Abstract A battery of agricultural straw derived biomass activated carbons supported LaOx modified MnOx (LaMn/BACs) was prepared by a facile impregnation method and then tested for the efficiency of simultaneous abatement of NO and Hg0. 15%LaMn/BAC manifested excellent removal efficiency of Hg0 (100%) and NO (86.7%) at 180 °C, which also exhibited splendid resistance to SO2 and H2O. The interaction between Hg0 removal and NO removal was explored, thereinto Hg0 removal had no influence on NO removal, while NO removal preponderated over Hg0 removal. The inhibitory effect of NH3 was greater than the accelerative effect of NO and O2 on Hg0 removal. The physicochemical characterization of related samples were characterized by SEM, XRD, BET, H2-TPR, NH3-TPD and XPS. After incorporating suitable LaOx into 15%Mn/BAC, the synergistic effect between LaOx and MnOx contributed to the improvement of BET surface area and total pore volume, the promotion of redox ability, surface active oxygen species and acid sites, inhibiting the crystallization of MnOx. 15%LaMn/BAC has the best catalytic oxidation activity at low temperature. That might be answerable for superior performance and preferable tolerance to SO2 and H2O. Finally, the principle of catalytic oxidation was also discussesed in this article.

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