Steady-State and Dynamic Desorption of Organic Vapor from Activated Carbon with Electrothermal Swing Adsorption

2007 ◽  
Vol 41 (14) ◽  
pp. 5063-5069 ◽  
Author(s):  
Hamidreza Emamipour ◽  
Zaher Hashisho ◽  
Diego Cevallos ◽  
Mark J. Rood ◽  
Deborah L. Thurston ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Steady State ◽  
Organic Vapor ◽  
Electrothermal Swing Adsorption

PVA-coated activated carbon for aerobic biological treatment of concentrated refractory organic wastewater

2000 ◽  
Vol 42 (3-4) ◽  
pp. 205-210 ◽  
Author(s):  
B.-R. Lim ◽  
H.-Y. Hu ◽  
N. Goto ◽  
K. Fujie
Keyword(s):  
Activated Carbon ◽  
Steady State ◽  
Sulfonic Acid ◽  
Biological Treatment ◽  
Treatment Process ◽  
Solid Phase ◽  
Volumetric Loading ◽  
Ubiquinone 10 ◽  
Polyvinyl Alcohol Particles ◽  
Biological Treatment Process

The treatment characteristics of concentrated p-phenol sulfonic acid (PSA) wastewater in a submerged bioreactor and a solid phase bioreactor packed with ACP particles (polyvinyl alcohol particles coated with powered activated carbon) were compared experimentally. The changes in biomass and microbial community with the degradation of PSA at both bioreactors were also evaluated using microbial quinones as an index. Greater than 95% of influent PSA was mineralized at the solid phase bioreactor under the volumetric loading of PSA ranging from 0.3 to 1.8 kg-C·m-3·d-1 at the steady state, but less than 10% of the influent PSA was mineralized in the submerged bioreactor. The solid phase aerobic biological treatment process was more effective for the treatment of concentrated refractory chemicals such as PSA than the submerged bioreactor. The dominant quinone species in the solid phase bioreactor were ubiquinone-10 and menaquinone-8(H4), while those in the submerged bioreactor were ubiquinone-8 and menaquinone-8. This suggests hat different microbes had contributed to the degradation in the two bioreactors.

Carbon-supported copper-organic framework as active catalysts for acetylene hydrochlorination

2021 ◽  
Author(s):  
Yi-Bo Wu ◽  
Yao Ma ◽  
Qingbin Li ◽  
Songtian Li ◽  
Yongjun Han ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Steady State ◽  
Vinyl Chloride ◽  
Transition States ◽  
Chemical Characterization ◽  
Acetylene Hydrochlorination ◽  
Physical Chemical ◽  
Organic Framework

In this work, activated carbon supported Cu-MOF as an acetylene hydrochlorination catalyst for manufacture vinyl chloride. Cu-MOF/AC with 15 wt% Cu-MOF content behaves the initial acetylene conversion of 99.2% and vinyl chloride selectivity of 98.5% at 200°C. By combing steady-state experiments and physical-chemical characterization results (XPS, BET, H2-TPR, C2H2-TPD, XRD and HCl adsorption experiments), Cu-O-C is shown to retard the reduction of Cu2+, improve the reactants adsorption and strengthen the anti-coking ability of Cu-based catalysts. According to the previous studies and the Rideal-Eley mechanism, it is proposed that Cu2+ first adsorbed C2H2 to generate transition states in catalysis acetylene hydrochlorination.

Deep Level Formation in Undoped and Oxygen-Doped GaN

2000 ◽  
Vol 639 ◽  
Author(s):  
J. M. Gregie ◽  
R. Y. Korotkov ◽  
B. W. Wessels
Keyword(s):  
Density Functional Theory ◽  
Steady State ◽  
Vapor Phase ◽  
Density Functional ◽  
Deep Level ◽  
Deep Level Defect ◽  
Functional Theory ◽  
Organic Vapor ◽  
Metal Organic ◽  
Formation Energies

ABSTRACTDeep level defects in oxygen doped GaN grown by metal-organic vapor phase epitaxy were investigated. Using steady-state photocapacitance (SSPC) spectroscopy, three deep levels with optical ionization energies of 1.0, 1.4, and 3.25 eV were observed in both nominally undoped and oxygen-doped samples. The total deep level defect concentrations ranged from 6 × 1015 cm-3 in undoped films to 3 × 1016 cm-3 in oxygen-doped films. The concentration of the 3.25 eV level defect increased upon oxygen doping, while the concentrationof the 1.0 and 1.4 eV levels were essentially dopant independent. From the measured concentrations the formation energies of the defects were calculated and compared to energies calculated using density functional theory.

Concomitant Adsorption and Desorption of Organic Vapor in Dry and Humid Air Streams using Microwave and Direct Electrothermal Swing Adsorption

2008 ◽  
Vol 42 (24) ◽  
pp. 9317-9322 ◽  
Author(s):  
Zaher Hashisho ◽  
Hamidreza Emamipour ◽  
Mark J. Rood ◽  
K. James Hay ◽  
Byung J. Kim ◽  
...  
Keyword(s):  
Humid Air ◽  
Adsorption And Desorption ◽  
Organic Vapor ◽  
Electrothermal Swing Adsorption ◽  
Air Streams

Regeneration of a Fixed Bed of Activated Carbon Adsorbed Organic Vapor by Using Hot Nitrogen Purge

1993 ◽  
Vol 28 (15-16) ◽  
pp. 2431-2447 ◽  
Author(s):  
Chen-Chia Huang ◽  
Tzyy-Ling Hwu ◽  
Yen-Sheng Hsia
Keyword(s):  
Activated Carbon ◽  
Fixed Bed ◽  
Organic Vapor
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