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.

Treatment of Imidacloprid Pesticide Wastewater by Microwave-Assisted Catalytic Oxidation

2012 ◽  
Vol 610-613 ◽  
pp. 2023-2027 ◽  
Author(s):  
Xiao Yi Bi ◽  
Hai Yan Yang ◽  
Pei Shi Sun ◽  
Xiao Yi Xu
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Carbon ◽  
Catalytic Oxidation ◽  
Working Conditions ◽  
Ph Value ◽  
Irradiation Time ◽  
Removal Rate ◽  
Microwave Assisted ◽  
Cod Removal Rate ◽  
Carbon Catalysts

In this study, modified activated carbon used as catalysts treat imidacloprid pesticide wastewater with microwave-assisted catalytic oxidation. The effect of working conditions such as hydrogen peroxide concentration, homogeneous catalysts concentration of Fe2+, amount of activated carbon catalysts, microwave power, irradiation time, wastewater temperature, and pH value on the treatment of imidacloprid pesticide wastewater in the process was investigated. The results show that COD removal rate , can reach 89.25%, with the following working conditions : imidacloprid pesticide wastewater with initial concentration of 268mg/ L , 100 mL ; hydrogen peroxide solution added at a concentration of 26.52g/L , Fe2+ concentration ,109.81mg/L; amount of activated carbon catalysts, 5g;power of microwave , 119 W; irradiation time , 4min ; pH value , 6.

Catalytic oxidation with Al–Ce–Fe–PILC as a post-treatment system for coffee wet processing wastewater

2012 ◽  
Vol 66 (8) ◽  
pp. 1663-1668 ◽  
Author(s):  
Nancy R. Sanabria ◽  
Yury M. Peralta ◽  
Mardelly K. Montañez ◽  
Nelson Rodríguez-Valencia ◽  
Rafael Molina ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Oxidation ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Water Source ◽  
Post Treatment ◽  
Treatment System ◽  
Total Phenolic ◽  
Wet Processing ◽  
High Conversion Rate

The effluent from the anaerobic biological treatment of coffee wet processing wastewater (CWPW) contains a non-biodegradable compound that must be treated before it is discharged into a water source. In this paper, the wet hydrogen peroxide catalytic oxidation (WHPCO) process using Al–Ce–Fe–PILC catalysts was researched as a post-treatment system for CWPW and tested in a semi-batch reactor at atmospheric pressure and 25 °C. The Al–Ce–Fe–PILC achieved a high conversion rate of total phenolic compounds (70%) and mineralization to CO2 (50%) after 5 h reaction time. The chemical oxygen demand (COD) of coffee processing wastewater after wet hydrogen peroxide catalytic oxidation was reduced in 66%. The combination of the two treatment methods, biological (developed by Cenicafé) and catalytic oxidation with Al-Ce–Fe–PILC, achieved a 97% reduction of COD in CWPW. Therefore, the WHPCO using Al–Ce–Fe–PILC catalysts is a viable alternative for the post-treatment of coffee processing wastewater.

scholarly journals SO2 Poisoning and Recovery of Copper-Based Activated Carbon Catalysts for Selective Catalytic Reduction of NO with NH3 at Low Temperature

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1426
Author(s):  
Marwa Saad ◽  
Agnieszka Szymaszek ◽  
Anna Białas ◽  
Bogdan Samojeden ◽  
Monika Motak
Keyword(s):  
Activated Carbon ◽  
Selective Catalytic Reduction ◽  
Active Sites ◽  
Catalytic Reduction ◽  
Incipient Wetness Impregnation ◽  
Exhaust Gas ◽  
Impregnation Method ◽  
No Conversion ◽  
So2 Poisoning ◽  
Carbon Catalysts

A series of materials based on activated carbon (AC) with copper deposited in various amounts were prepared using an incipient wetness impregnation method and tested as catalysts for selective catalytic reduction of nitrogen oxides with ammonia. The samples were poisoned with SO2 and regenerated in order to analyze their susceptibility to deactivation by the harmful component of exhaust gas. NO conversion over the fresh catalyst doped with 10 wt.% of Cu reached 81% of NO conversion at 140 °C and about 90% in the temperature range of 260–300 °C. The rate of poisoning with SO2 was dependent on Cu loading, but in general, it lowered NO conversion due to the formation of (NH4)2SO4 deposits that blocked the active sites of the catalysts. After regeneration, the catalytic activity of the materials was restored and NO conversion exceeded 70% for all of the samples.

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

scholarly journals Activated Carbons from Fast Pyrolysis Biochar as Novel Catalysts for the Post-Treatment of Pyrolysis Vapors, Studied by Analytical Pyrolysis

2020 ◽  
Vol 6 (4) ◽  
pp. 65
Author(s):  
Taina Ohra-aho ◽  
Christian Lindfors ◽  
Juha Lehtonen ◽  
Tarja Tamminen ◽  
Virpi Siipola
Keyword(s):  
Activated Carbon ◽  
Active Sites ◽  
Activated Carbons ◽  
Degradation Products ◽  
High Surface ◽  
Fast Pyrolysis ◽  
Post Treatment ◽  
Mineral Contents ◽  
Surface Areas ◽  
Carbon Catalysts

Biochars are attractive materials for carbon catalysts since their carbon content and surface area are relatively high and minerals present in biochar can act as active sites for catalytic reactions. In this study, biochars from the fast pyrolysis of birch, pine, and unbarked willow were activated and acid washed. These materials were tested as catalysts for a post-treatment of pine wood pyrolysis vapors, aiming at stabilizing the vapors before their condensation. All the unmodified biochars had high content of minerals, those being highest in willow due to the bark. After the activation treatments, the surface areas and pore volumes of all biochars significantly increased. All studied biochars and activated carbon catalysts reduced the oxygen content of the pyrolysis degradation products. This effect was more pronounced for compounds derived from polysaccharides vs. lignin. The most promising catalyst for vapor upgrading was unwashed activated carbon from willow, having high surface areas and pore volumes together with high mineral contents. These properties together promoted the high conversion of polysaccharide-derived products (anhydrosugars, acids, and pyrans) into CO2. Release of highly oxidized degradation products may indicate that reductive stabilization takes place via hydrogen migration from the polysaccharide-derivatives to lignin derivatives, mediated by the carbon catalyst.

Iron-based clusters embedded in nitrogen doped activated carbon catalysts with superior cathodic activity in microbial fuel cells

2020 ◽  
Vol 8 (21) ◽  
pp. 10772-10778 ◽  
Author(s):  
Xiaoyuan Zhang ◽  
Xingguo Guo ◽  
Qiuying Wang ◽  
Rufan Zhang ◽  
Ting Xu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Activated Carbon ◽  
Microbial Fuel Cells ◽  
Active Sites ◽  
High Exposure ◽  
Nitrogen Doped ◽  
Iron Based ◽  
Carbon Catalysts

Fe-clusters/NAC catalysts showed superior cathodic activity due to the high exposure of iron-based clusters and other active sites.

Advanced Treatment of Coking Wastewater by Oxidation Process Using Pyrite and Hydrogen Peroxide

2013 ◽  
Vol 726-731 ◽  
pp. 2521-2525
Author(s):  
Zhi Yong Zhang ◽  
De Li Wu
Keyword(s):  
Hydrogen Peroxide ◽  
Oxidation Process ◽  
Low Cost ◽  
Oxygen Demand ◽  
Utilization Efficiency ◽  
Advanced Treatment ◽  
Coking Wastewater ◽  
Second Stage ◽  
Potential Alternative ◽  
High Utilization

Coking wastewater is a kind of recalcitrant wastewater including complicate compositions. Advanced treatment of coking wastewater by Fenton-Like reaction using pyrite as catalyst was investigated in this paper. The results show that the chemical oxygen demand (COD) of coking wastewater decreased significantly by method of coagulation combined with two-stage oxidation reaction. COD of wastewater can decrease from 250mg/l to 45mg/l after treatment, when 2g/L pyrite was used in each stage oxidation and the dosage of hydrogen peroxide (H2O2) is 0.2ml/l for first stage treatment, 0.1ml/l for second stage treatment respectively. The pyrite is effective to promote Fenton-Like reaction with low cost due to high utilization efficiency of H2O2, moreover, catalyst could be easily recovered and reused. The Fenton-Like reaction might be used as a potential alternative to advanced treatment of recalcitrant wastewater.

scholarly journals Pretreatment of Switchgrass for Production of Glucose via Sulfonic Acid-Impregnated Activated Carbon

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 504
Author(s):  
Yane Ansanay ◽  
Praveen Kolar ◽  
Ratna Sharma-Shivappa ◽  
Jay Cheng ◽  
Consuelo Arellano
Keyword(s):  
Activated Carbon ◽  
Sulfonic Acid ◽  
Solid Acid ◽  
Methanesulfonic Acid ◽  
Biofuel Production ◽  
Acid Catalysts ◽  
Effects Of Temperature ◽  
Carbon Catalysts ◽  
Hydrolysis Of

In the present research, activated carbon-supported sulfonic acid catalysts were synthesized and tested as pretreatment agents for the conversion of switchgrass into glucose. The catalysts were synthesized by reacting sulfuric acid, methanesulfonic acid, and p-toluenesulfonic acid with activated carbon. The characterization of catalysts suggested an increase in surface acidities, while surface area and pore volumes decreased because of sulfonation. Batch experiments were performed in 125 mL serum bottles to investigate the effects of temperature (30, 60, and 90 °C), reaction time (90 and 120 min) on the yields of glucose. Enzymatic hydrolysis of pretreated switchgrass using Ctec2 yielded up to 57.13% glucose. Durability tests indicated that sulfonic solid-impregnated carbon catalysts were able to maintain activity even after three cycles. From the results obtained, the solid acid catalysts appear to serve as effective pretreatment agents and can potentially reduce the use of conventional liquid acids and bases in biomass-into-biofuel production.

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