scholarly journals Swift Reduction of Nitroaromatics By Gold Nanoparticles Anchored On Steam-Activated Carbon Black Via Simple Preparation

2021 ◽  
Author(s):  
Yukui Fu ◽  
Cui Lai ◽  
Wenjing Chen ◽  
Huan Yi ◽  
Xigui Liu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Carbon Black ◽  
Catalytic Performance ◽  
Metal Nanoparticle ◽  
Simple Method ◽  
Au Nps ◽  
Nanoparticle Catalysts ◽  
Loading Amount ◽  
Adsorption Desorption ◽  
Desorption Method

Abstract Gold (Au) nanoparticles supported on certain platforms display highly efficient activity on nitroaromatics reduction. In this study, steam-activated carbon black (SCB) was used as a platform to fabricate Au/SCB catalysts via a green and simple method for 4-nitrophenol (4-NP) reduction. The obtained Au/SCB catalysts exhibit efficient catalytic performance in reduction of 4-NP (rate constant kapp = 2.1925 min-1). The effects of SCB activated under different steam temperature, Au loading amount, pH and reaction temperature were studied. The structural advantages of SCB as a platform were analyzed by various characterizations. Especially, the result of N2 adsorption-desorption method showed that steam activating process could bring higher surface area (from 185.9689 m²/g to 249.0053 m²/g), larger pore volume (from 0.073268 cm³/g to 0.165246 cm³/g) and more micropore for SCB when compared with initial CB, demonstrating the suitable of SCB for Au NPs anchoring, thus promoting the catalytic activity. This work contributes to the fabrication of other supported metal nanoparticle catalysts for preparing different functional nanocomposites for different applications.

Synthesis of Dimethyl Carbonate over Activated Carbon Supported Cu Based Catalysts

2014 ◽  
Vol 953-954 ◽  
pp. 1242-1245
Author(s):  
Wang Ruiyu ◽  
Li Zhong
Keyword(s):  
Activated Carbon ◽  
Vapor Phase ◽  
Dimethyl Carbonate ◽  
Catalytic Performance ◽  
Copper Salt ◽  
Precipitation Method ◽  
Catalyst Structure ◽  
Loading Amount ◽  
Copper Based Catalyst

The supported chloride-free copper based catalyst was prepared by deposition-precipitation method and used to catalyze the direct vapor-phase oxycarbonylation of methanol to dimethyl carbonate (DMC). The effect of reductive agent and copper salt precursor on catalyst structure and catalytic performance were investigated, the catalysts were characterized by XRD, H2-TPR techniques. Using Cu (CH3COO)2 as precursor, glucose as reductive agent, when loading amount was 17.1%, the Cu2O/AC catalyst shows the best performance for DMC synthesis. Under the condition of CO/MeOH/O2=5/11/1, SV=6625h-1, the average STY of DMC in 9 hrs running was 71.96mg/(g·h), and selectivity of DMC was 83.13%.

Capillary Adsorption of Nanostructure Carbonic Materials for Nitrobenzene in Wastewater

2011 ◽  
Vol 415-417 ◽  
pp. 1717-1720
Author(s):  
Yu Feng Sun ◽  
Ai Min Zhang ◽  
Bing Cheng Peng ◽  
Zong Tang Liu ◽  
Zheng Hao Fei ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Activated Carbon ◽  
Carbon Black ◽  
Adsorption Mechanism ◽  
Capillary Condensation ◽  
Nitrogen Adsorption ◽  
Adsorptive Capacity ◽  
Experimental Conditions ◽  
Surface Areas ◽  
Adsorption Desorption

The aims of this work were to make use of carbonic materials to remove nitrobenzene in wastewater and investigate adsorption mechanism. The adsorption ability of different carbonic materials for nitrobenzene was compared. It was found that carbon nanotubes and carbon black exhibited higher adsorptive capacity than coconut activated carbon and granular activated carbon at the same experimental conditions. The specific surface areas and pore distribution was obtained by low-temperature nitrogen adsorption-desorption. We concluded that the capillary condensation in mesopores played an important role in the adsorption process owing to special nanostructure of carbon nanotubes and carbon black.

Glass Transition in Carbon Black Reinforced Rubber

1968 ◽  
Vol 41 (5) ◽  
pp. 1194-1202 ◽  
Author(s):  
P. P. A. Smit
Keyword(s):  
Glass Transition ◽  
Activated Carbon ◽  
Carbon Black ◽  
Layer Thickness ◽  
Dynamic Properties ◽  
Physical Adsorption ◽  
Adsorbed Layer ◽  
Simple Liquids ◽  
Black Surface ◽  
Adsorption Desorption

Abstract It can be stated that the effect of carbon black in a rubber vulcanizate with regard to dynamic properties can be explained by assuming physical adsorption of rubber on the black surface. The effect can be represented by assuming an adsorbed layer having different properties from the bulk rubber taking the layer thickness to be at least 20 A. Adsorption-desorption from this layer causes non-linearity and may contribute to losses observed in the glass transition. This adsorption is analogous to adsorption of simple liquids in microporous systems such as silica gel and activated carbon.

scholarly journals Preparations and Characterizations of Hierarchical Macropore Activated Carbon Monolith Electrode from Rubber Wood for Supercapacitor Application

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Erman Taer
Keyword(s):  
Activated Carbon ◽  
Chemical Activation ◽  
Activation Process ◽  
Preparation Technique ◽  
Equivalent Series Resistance ◽  
Simple Method ◽  
Rubber Wood ◽  
Carbon Monolith ◽  
Adsorption Desorption ◽  
Activated Carbon Monolith

<p>Preparation of hierarchical macropore activated carbon monolith (HMACM) from rubber wood was investigated. The samples were prepared with small cutting of rubber wood in cross sectional method. The electrode preparation was started by pre-carbonization process followed by carbonization at 600 <sup>o</sup>C and physical activation process at 900<sup> o</sup>C in N<sub>2</sub> and CO<sub>2</sub> gas atmosphere, respectively. The samples then were followed by chemical activation process with combination of chemical activation agent of KOH and HNO3 solutions. The HMACMs were neutralized by immersing the samples in copious amount of water and dried the samples for 24 hours. Porosity properties were performed by N<sub>2</sub> adsorption-desorption data and morphology characterization was analyzed by scanning electron microscope (SEM) instrument. The electrochemical properties was studied by electrochemical impedance spectroscopy, cyclic voltammetry and charge-discharge at constan current methode.  The SEM micrograph and adsorption-desorption data were also proved that the HMACM sample have a hierarchical macropore at the surface and crossectional section. The porosity data shown the HMACM sample have BET surface area of 331 m<sup>2</sup>/g with average pore diameter of 1.7 nm. Equivalent series resistance and optimum capacitance specific of the HMACM electrode of 0.77 Ohm and 154 F/g, respectively. In conclusion, this study showed that the preparation method would propose as a simple method of HMACM electrode preparation technique for supercapacitor applications.</p>

scholarly journals Preparations and Characterizations of Hierarchical Macropore Activated Carbon Monolith Electrode from Rubber Wood for Supercapacitor Application

2016 ◽  
Vol 1 ◽  
Author(s):  
Erman Taer
Keyword(s):  
Activated Carbon ◽  
Chemical Activation ◽  
Activation Process ◽  
Preparation Technique ◽  
Equivalent Series Resistance ◽  
Simple Method ◽  
Rubber Wood ◽  
Carbon Monolith ◽  
Adsorption Desorption ◽  
Activated Carbon Monolith

<p>Preparation of hierarchical macropore activated carbon monolith (HMACM) from rubber wood was investigated. The samples were prepared with small cutting of rubber wood in cross sectional method. The electrode preparation was started by pre-carbonization process followed by carbonization at 600 <sup>o</sup>C and physical activation process at 900<sup> o</sup>C in N<sub>2</sub> and CO<sub>2</sub> gas atmosphere, respectively. The samples then were followed by chemical activation process with combination of chemical activation agent of KOH and HNO3 solutions. The HMACMs were neutralized by immersing the samples in copious amount of water and dried the samples for 24 hours. Porosity properties were performed by N<sub>2</sub> adsorption-desorption data and morphology characterization was analyzed by scanning electron microscope (SEM) instrument. The electrochemical properties was studied by electrochemical impedance spectroscopy, cyclic voltammetry and charge-discharge at constan current methode.  The SEM micrograph and adsorption-desorption data were also proved that the HMACM sample have a hierarchical macropore at the surface and crossectional section. The porosity data shown the HMACM sample have BET surface area of 331 m<sup>2</sup>/g with average pore diameter of 1.7 nm. Equivalent series resistance and optimum capacitance specific of the HMACM electrode of 0.77 Ohm and 154 F/g, respectively. In conclusion, this study showed that the preparation method would propose as a simple method of HMACM electrode preparation technique for supercapacitor applications.</p>

Oxidative Removal of Dibenzothiophene by H2O2 over Activated Carbon-Supported Phosphotungstic Acid Catalysts

2010 ◽  
Vol 132 ◽  
pp. 126-132 ◽  
Author(s):  
Guo Xian Yu ◽  
Rui Xue Zhou ◽  
Ji Bing Li ◽  
Xiao Long Zhou ◽  
Cheng Lie Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Phosphotungstic Acid ◽  
Carbon Support ◽  
Molar Ratio ◽  
N2 Adsorption ◽  
Oxidative Removal ◽  
Loading Amount ◽  
Model Oil ◽  
Adsorption Desorption ◽  
Sulfur Containing

Phosphotungstic acid (HPW) supported on activated carbon (AC) combined with hydrogen peroxide formed an oxidative desulfurizaiton (ODS) system to oxidize sulfur-containing compounds in diesel fuel. Dibenzothiophene (DBT) dissolved in n-octane was selected as a model feedstock for studying this new ODS system. The HPW/AC catalysts were characterized with XRD, FTIR and N2 adsorption-desorption measurements. HPW was highly dispersed on the surface of carbon support. It was found that the DBT adsorption capacity decreased from 42 mg S/g to 33.13 mg S/g as HPW loading amount increased from 0 to 15 wt.%. Oxidative removal of DBT in the model oil significantly increased with increasing HPW loadings on the support from 0 to 10 wt.%. 100 % DBT was removed by using the catalysts with HPW content higher than 10 wt. %. At 80 °C, oxidative removal of DBT reached 100 % after 40 min of reaction when O/S molar ratio ranged from 4 to 10.

Adsorption/desorption properties of activated carbon on toluene with operation condition and characteristics

2015 ◽  
Vol 14 (1) ◽  
pp. 66-72 ◽  
Author(s):  
Seo-Hyun Pak ◽  
◽  
Myung-Seop Shin ◽  
Hyun-Jung Kim ◽  
Yong-Woo Jeon
Keyword(s):  
Activated Carbon ◽  
Operation Condition ◽  
Adsorption Desorption
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