scholarly journals Cerium(IV) Enhances the Catalytic Oxidation Activity of Single-Site Cu Active Sites in MOFs

ACS Catalysis ◽  
2020 ◽  
Vol 10 (14) ◽  
pp. 7820-7825 ◽  
Author(s):  
Xin He ◽  
Benjamin G. Looker ◽  
Kimberly T. Dinh ◽  
Amanda W. Stubbs ◽  
Tianyang Chen ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Active Sites ◽  
Single Site ◽  
Oxidation Activity

Wet hydrogen peroxide catalytic oxidation of phenol with FeAC (iron-embedded activated carbon) catalysts

2010 ◽  
Vol 61 (6) ◽  
pp. 1489-1498 ◽  
Author(s):  
Rey-May Liou ◽  
Shih-Hsiung Chen ◽  
Cheng-Hsien Huang ◽  
Mu-Ya Hung ◽  
Jing-Song Chang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Carbon ◽  
Catalytic Oxidation ◽  
Active Sites ◽  
Oxygen Demand ◽  
Oxidation Activity ◽  
Iron Leaching ◽  
Diffraction Patterns ◽  
Carbon Catalysts ◽  
High Level

This investigation aims at exploring the catalytic oxidation activity of iron-embedded activated carbon (FeAC) and the application for the degradation of phenol in the wet hydrogen peroxide catalytic oxidation (WHPCO). FeAC catalysts were prepared by pre-impregnating iron in coconut shell with various iron loadings in the range of 27.5 to 46.5% before they were activated. The FeAC catalysts were characterised by measuring their surface area, pore distribution, functional groups on the surface, and X-ray diffraction patterns. The effects of iron loading strongly inhibited the pore development of the catalyst but benefited the oxidation activity in WHPCO. It was found that the complete conversion of phenol was observed with all FeAC catalysts in oxidation. High level of chemical oxygen demand (COD) abatement can be achieved within the first 30 minutes of oxidation. The iron embedded in the activated carbon showed good performance in the degradation and mineralisation of phenol during the oxidation due to the active sites as iron oxides formed on the surface of the activated carbon. It was found that the embedding irons were presented in γ-Fe2O3, α-Fe2O3, and α-FeCOOH forms on the activated carbon. The aging tests on FeAC catalysts showed less activity loss, and less iron leaching was found after four oxidation runs.

scholarly journals Identification of Active Sites in the Catalytic Oxidation of 2‐Propanol over Co1+xFe2‐xO4 Spinel Oxides at Solid/Liquid and Solid/Gas Interfaces

ChemCatChem ◽  
2021 ◽  
Author(s):  
Tobias Falk ◽  
Eko Budiyanto ◽  
Maik Dreyer ◽  
Christin Pflieger ◽  
Daniel Waffel ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Active Sites ◽  
Spinel Oxides ◽  
Solid Liquid

The fairweather fault ten years after the southeast Alaska earthquake of 1958

1969 ◽  
Vol 59 (5) ◽  
pp. 1927-1936 ◽  
Author(s):  
Robert Page
Keyword(s):  
Fault Zone ◽  
Active Sites ◽  
Single Site ◽  
Field Observations ◽  
Southeast Alaska ◽  
San Andreas ◽  
Lake Region ◽  
Alaska Earthquake

abstract Field observations made ten years after the southeast Alaska earthquake (M = 7.9) of 10 July 1958 reveal environmental and geomorphic changes in the Fairweather fault zone. Faulting associated with the earthquake killed many trees in the Crillon Lake region. Trees were tilted and later fell, and possibly were drowned because of changes in drainage conditions. A nearly vertical, 2-meter scarp in soil has been eroded to a slope of 35° to 40° in the decade since 1958. Microearthquake activity sampled at a single site on the fault is at least equal to or possibly greater than that reported from active sites on the San Andreas and Denali faults. The distribution of S-P times is consistent with a uniform planar distribution of shocks on a segment of the fault that slipped in 1958. The expected seismicity from aftershocks of the 1958 earthquake is less, but not significantly less, than the observed seismicity.

Synthesis and Catalytic Activity Studies of V/K/Ca and V/Ks/Ce Based Catalysts for Diesel Soot Oxidation

2007 ◽  
Vol 336-338 ◽  
pp. 1995-1998
Author(s):  
Yong Heng Zhang ◽  
Jian Zhong Xue
Keyword(s):  
Catalytic Activity ◽  
Catalytic Oxidation ◽  
Amorphous Phase ◽  
Porous Alumina ◽  
Soot Oxidation ◽  
Diesel Soot ◽  
Oxidation Activity ◽  
Diesel Soot Oxidation ◽  
Oxidation Onset Temperature ◽  
Catalyst Systems

The catalysts based on V/K/Ca and V/Ks/Ce systems for diesel soot catalytic oxidation were synthesized onto the porous alumina substrates. Both catalyst systems showed a good catalytic oxidation activity. The V/K/Ca system exhibited the lowest oxidation onset temperature (OOT) of about 359oC with a composition of V/K/Ca =1:1:0.1 where the V and Ca and/or K elements could form a kind of amorphous phase that determined the catalytic activity. The V/Ks/Ce system displayed the lowest OOT of about 350oC with a composition of V/Ks/Ce = 1:2:0.1 where the K2SO4 and K5V2O3(SO4)4 phases could contribute most to the catalytic activity.

Hierarchical MnOx@PVDF/MWCNTs tree-like nanofiber membrane with high catalytic oxidation activity

2019 ◽  
Vol 780 ◽  
pp. 805-815 ◽  
Author(s):  
Zongjie Li ◽  
Weimin Kang ◽  
Zhenbang Han ◽  
Jing Yan ◽  
Bowen Cheng ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Nanofiber Membrane ◽  
Oxidation Activity

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.

Side Chain Induced Self-Assembly and Selective Catalytic Oxidation Activity of Copper(I)–Copper(II)-N4 Complexes

2020 ◽  
Vol 20 (2) ◽  
pp. 1237-1241 ◽  
Author(s):  
Yun-Long Hou ◽  
Yun-Lei Peng ◽  
Yingxue Diao ◽  
Jie Liu ◽  
Lizhuang Chen ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Self Assembly ◽  
Side Chain ◽  
Oxidation Activity ◽  
Selective Catalytic Oxidation

Double graphitic-N doping for enhanced catalytic oxidation activity of carbocatalysts

2019 ◽  
Vol 21 (10) ◽  
pp. 5481-5488 ◽  
Author(s):  
Meiling Hou ◽  
Xin Zhang ◽  
Shandong Yuan ◽  
Wanglai Cen
Keyword(s):  
Work Function ◽  
Catalytic Oxidation ◽  
Functional Groups ◽  
Reactive Oxygen ◽  
Catalytic Efficiency ◽  
Oxidation Activity ◽  
Promotion Effect ◽  
Oxygen Functional Groups ◽  
N Doping

Double-GrN remarkably enhanced the catalytic efficiency for O2 dissociation reactions and accelerates the generation of highly chemically reactive oxygen functional groups. The promotion effect is ascribed to the reduction of the work function of carbocatalysts due to N doping, which facilitates the transfer of electrons from carbocatalysts to the adsorbed O2 molecules for their activation.

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