scholarly journals Effect of Pyrolysis Temperature During Valorization of Date Stones on Physiochemical Properties of Activated Carbon and Its Catalytic Activity for the Oxidation of Cycloalkenes

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 686
Author(s):  
Hamed M. Alshammari ◽  
Nadir Abbas
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Calcination Temperature ◽  
Pyrolysis Temperature ◽  
Catalytic Properties ◽  
Kingdom Of Saudi Arabia ◽  
Physiochemical Properties ◽  
Pyrolysis Method ◽  
Different Temperatures ◽  
The Impact

This study presents findings on the chemical synthesis of activated carbon from Saudi dates and its structural, chemical, and catalytic properties. Dates are among the top biowaste materials in the Kingdom of Saudi Arabia, and efforts are underway to utilize this resource. A chemical pyrolysis method was used to synthesize activated carbon from date stones. Synthesized activated carbon was calcined at different temperatures of 400, 500, 600, and 700 °C, and the impact of calcination temperature on the properties of activated carbon was investigated. For this purpose, contemporary characterization tools, namely, XRD, Raman spectroscopy, FTIR, SEM, TEM, TGA, DSC, and XPS, were employed. Results are discussed and compared with associated studies. Finally, the catalytic activity of gold-deposited activated carbon for the oxidation of cycloalkenes was evaluated, and it was found that the calcination temperature has a linear positive relationship with the catalytic activity.

Effect of calcination temperature on the morphology and catalytic properties of ZnO nanostructures fabricated from a chiral precursor for photodegradation of both cationic and anionic dyes

2022 ◽  
Author(s):  
Shradha Gandhi ◽  
Rupinder Kaur ◽  
Vandana Sharma ◽  
Sanjay Mandal
Keyword(s):  
Calcination Temperature ◽  
Catalytic Properties ◽  
Zno Nanostructures ◽  
Anionic Dyes ◽  
Different Temperatures

Diverse ZnO nanostructures (ZnO_1 to ZnO_3) were synthesized by direct calcination of a chiral MOF precursor {[Zn4(µ3-OH)2(D-2,4-cbs)2(H2O)4].5H2O}n (Zn-CBS) at three different temperatures 600, 700 and 800 oC, respectively. On the...

Effect of calcination temperature on the microstructure of vanadium nitride/nitrogen-doped graphene nanocomposites as anode materials in electrochemical capacitors

2019 ◽  
Vol 6 (1) ◽  
pp. 164-171 ◽  
Author(s):  
Jinghua Liu ◽  
Fengfan Li ◽  
Weiwei Liu ◽  
Xin Li
Keyword(s):  
Calcination Temperature ◽  
Anode Materials ◽  
Vanadium Nitride ◽  
Graphene Nanocomposites ◽  
Nitrogen Doped ◽  
Pyrolysis Method ◽  
Different Temperatures ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

VN/N-doped graphene nanocomposites have been fabricated by an in situ pyrolysis method at different temperatures for supercapacitors.

Rhenium and manganese modified activated carbon as catalyst for methanol decomposition

2007 ◽  
Vol 85 (2) ◽  
pp. 118-123 ◽  
Author(s):  
T Tsoncheva ◽  
S Vankova ◽  
O Bozhkov ◽  
D Mehandjiev
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Carbon Materials ◽  
Catalytic Properties ◽  
Methanol Decomposition ◽  
Complex Character ◽  
Active Centre ◽  
Modified Activated Carbon

Bicomponent manganese and rhenium modified activated carbon materials, prepared by different methods, are studied and compared with the corresponding monocomponent materials as catalysts in methanol decomposition to CO and hydrogen. The best catalytic activity and stability is observed for the sample obtained by simultaneous deposition of Mn and Re precursors. The complex character of the catalytic active centre, including manganese and rhenium irons in various oxidative states, is discussed. The determining role of the Mn(II) ions in the improvement of the catalytic properties is assumed.Key words: rhenium, manganese, activated carbon, methanol decomposition.

Metal complexes supported on activated carbon as catalysts for the hydrogenation of anthracene

2017 ◽  
Vol 15 (5) ◽  
Author(s):  
Liliana Giraldo ◽  
Moreno-Piraján ◽  
John J. Hurtado
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Supported Catalysts ◽  
Reaction Times ◽  
Chemical Characteristics ◽  
Distribution Analysis ◽  
X Ray ◽  
Different Temperatures ◽  
Surface Area Determination ◽  
Area Determination

Abstract In this work, the catalytic activity was investigated in the hydrogenation of anthracene by BaSO3 and Cu(II), Zn(II) and Ni(II) complexes that contain the ligand bis(3,5-dimethyl-1-pyrazolyl) methane (L). The compounds were supported on activated carbon (AC) and studied as catalysts for the hydrogenation of anthracene over different temperatures and reaction times. The supported catalysts (Cat/AC) were prepared by direct impregnation on the support and characterized by surface area determination, FTIR spectroscopy, and X-ray powder diffraction and pore size distribution analysis. The results showed high conversions and selectivity toward hydrogenated products, where the highest value was obtained using LNiCl2/AC and the lowest with BaSO3/AC. It was established that the selectivity for Tetrahydroanthracene was more highest quantity as a product of hydrogenation using Cat/AC which is dependent of the temperature, reaching a peak at 450 °C. At this temperature and with very short reaction times, the catalytic activity is influenced mainly by the chemical characteristics of the metal in the complexes and the AC support.

Preparation of SiNOf/BN High Temperature Wave-Transparent Composites by Precursor Infiltration and Pyrolysis Method

2012 ◽  
Vol 508 ◽  
pp. 11-16 ◽  
Author(s):  
Feng Cao ◽  
Zhen Yu Fang ◽  
Fei Chen ◽  
Chang Rui Zhang ◽  
Qiang Shen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Pyrolysis Temperature ◽  
Temperature Wave ◽  
Densification Behavior ◽  
Pyrolysis Method ◽  
Dielectric Loss Angle ◽  
Different Temperatures ◽  
Transparent Composites

Sino Fibers Reinforced BN Wave-Transparent Composites (SiNOf/BN) Were Fabricated through Precursor Infiltration and Pyrolysis (PIP) Method Using Borazine as Precursor. The Effect of Pyrolysis Temperature on the Densification Behavior, Microstructures, Mechanical Properties and Dielectric Properties of the Composites Was Investigated. The Results Suggest that with the Increase of the Pyrolysis Temperature from 800 °C to 1000 °C, the Density, Mechanical Properties and Dielectric Constant of the Composites Are Increased, but the Infiltration Efficiency Varies Little. At the Pyrolysis Temperature of 1000 °C, the Density of SiNOf/BN Composites is 1.84 g∙cm-3 and the Flexural Strength and Elastic Modulus Are 148.2 MPa and 26.2 GPa Respectively. The Dielectric Properties, Including Dielectric Constant of 3-4 and Dielectric Loss Angle Tangent of below 7×10-3, Obtained at Three Different Temperatures Are Excellent for the SiNOf/BN Composites Applied as Wave-Transparent Materials.

scholarly journals Impact of Granular Activated Carbon on Anaerobic Process and Microbial Community Structure during Mesophilic and Thermophilic Anaerobic Digestion of Chicken Manure

2022 ◽  
Vol 14 (1) ◽  
pp. 447
Author(s):  
Elvira E. Ziganshina ◽  
Svetlana S. Bulynina ◽  
Ayrat M. Ziganshin
Keyword(s):  
Activated Carbon ◽  
Anaerobic Digestion ◽  
Granular Activated Carbon ◽  
Ammonia Level ◽  
Chicken Manure ◽  
Batch Tests ◽  
Thermophilic Anaerobic Digestion ◽  
Different Temperatures ◽  
The Impact ◽  
Archaeal Communities

In this work, the impact of granular activated carbon (GAC) on the mesophilic and thermophilic anaerobic digestion of chicken manure and the structure of microbial communities was investigated. These results demonstrated that GAC supplementation effectively enhanced the consumption of produced organic acids in the mesophilic and thermophilic batch tests, accompanied by faster biomethane production in the presence of GAC than from reactors without GAC. However, since the free ammonia level was 3–6 times higher in the thermophilic reactors, this led to the instability of the anaerobic digestion process of the nitrogen-rich substrate at thermophilic temperatures. Bacteroidia and Clostridia were the two main bacterial classes in the mesophilic reactors, whereas the class Clostridia had a competitive advantage over other groups in the thermophilic systems. The archaeal communities in the mesophilic reactors were mainly represented by representatives of the genera Methanosarcina, Methanobacterium, and Methanotrix, whereas the archaeal communities in the thermophilic reactors were mainly represented by members of the genera Methanosarcina, Methanoculleus, and Methanothermobacter. New data obtained in this research will help control and manage biogas reactors in the presence of GAC at different temperatures.

scholarly journals Adsorptive removal of bulky dye molecules from water with mesoporous polyaniline-derived carbon

2020 ◽  
Vol 11 ◽  
pp. 597-605 ◽  
Author(s):  
Hyung Jun An ◽  
Jong Min Park ◽  
Nazmul Abedin Khan ◽  
Sung Hwa Jhung
Keyword(s):  
Activated Carbon ◽  
Pyrolysis Temperature ◽  
Van Der Waals Interactions ◽  
Maximum Adsorption Capacity ◽  
Dye Molecules ◽  
Mesopore Volume ◽  
Adsorptive Removal ◽  
Different Temperatures ◽  
Acid Red 1 ◽  
Purification Of Water

Polyaniline-derived carbon (PDC) was obtained via pyrolysis of polyaniline under different temperatures and applied for the purification of water contaminated with dye molecules of different sizes and charge by adsorption. With increasing pyrolysis temperature, it was found that the hydrophobicity, pore size and mesopore volume increased. A mesoporous PDC sample obtained via pyrolysis at 900 °C showed remarkable performance in the adsorption of dye molecules, irrespective of dye charge, especially in the removal of bulky dye molecules, such as acid red 1 (AR1) and Janus green B (JGB). For example, the most competitive PDC material showed a Q 0 value (maximum adsorption capacity) 8.1 times that of commercial, activated carbon for AR1. The remarkable adsorption of AR1 and JGB over KOH-900 could be explained by the combined mechanisms of hydrophobic, π–π, electrostatic and van der Waals interactions.

scholarly journals Effects of Li2O Doping on the Surface and Catalytic Properties of Co3O4–Fe2O3 Solids Precalcined at Different Temperatures

2000 ◽  
Vol 18 (3) ◽  
pp. 243-260 ◽  
Author(s):  
G.A. El-Shobaky ◽  
M.A. Shouman ◽  
M.N. Alaya
Keyword(s):  
Activation Energy ◽  
Catalytic Activity ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Nitrogen Adsorption ◽  
Surface Characteristics ◽  
Oxidation Of Co ◽  
Surface Areas ◽  
Different Temperatures ◽  
Activation Energy Of Sintering

The effects of Li2O treatment on the solid–solid interactions and the surface and catalytic properties of the Co3O4–Fe2O3 system have been studied using TG, DTA and XRD methods, nitrogen adsorption studies at −196°C and the catalytic oxidation of CO by O2 at 150–350°C. The results obtained showed that Li2O doping followed by precalcination at 500–1000°C enhanced the formation of cobalt ferrite to an extent proportional to the amount of dopant added (0.52–6.0 mol% Li2O). The solid–solid interaction leading to the formation of CoFe2O4 took place at temperatures ≥700°C in the presence of the Li2O dopant. Lithia doping modified the surface characteristics of the Co3O4–Fe2O3 solids, both increasing and decreasing their BET surface areas depending on the amount of dopant added and the precalcination temperature employed for the treated solids. The activation energy of sintering (ΔES) of cobalt/ferric mixed oxides was determined for the pure and doped solids from the variation in their specific surface areas as a function of the precalcination temperature. Both an increase and a decrease in the value of ΔES due to Li2O doping occurred depending on the amount of lithia added. The doping of Co3O4–FeO solids, followed by precalcination at 500°C, effected a significant increase (144%) in their catalytic activity towards CO oxidation by O2. Precalcination at 700–1000°C of the mixed oxide solids doped with Li2O (0.52 and 0.75 mol%) resulted in an increase in their catalytic activity which decreased upon increasing the amount of Li2O added above this limit. The activation energy of the catalyzed reaction was determined for the pure and variously doped solids studied.

scholarly journals Catalytic Properties of Pure and K+-Doped CuO/MgO System Towards 2-Propanol Conversion

2017 ◽  
Vol 57 (1) ◽  
Author(s):  
Sahar A. El-Molla ◽  
Gamil A. El-Shobaky ◽  
Nabil H. Amin ◽  
Mohamed N. Hammed ◽  
Sahar N. Sultan
Keyword(s):  
Catalytic Activity ◽  
Calcination Temperature ◽  
Isopropyl Alcohol ◽  
Catalytic Properties ◽  
Impregnation Method ◽  
Minor Phase ◽  
Selective Catalyst ◽  
Surface Areas ◽  
Mgo Support ◽  
Adsorption Of N2

CuO/MgO system having different compositions was prepared by impregnation method followed by calcination at 400-900 °C. The effect of CuO content, calcination temperature and doping with small amounts of K<sup>+</sup> species (1-3 mol %) on physicochemical, surface and catalytic properties of the system were investigated using XRD, adsorption of N2 at -196 °C, and conversion of isopropyl alcohol at 150-400 °C using a flow technique. The results revealed that the solids having the formulae 0.2 and 0.3 CuO/MgO calcined at 400 °C consisted of nanosized MgO and CuO as major phases together with Cu<sub>2</sub>O as minor phase. The BET-surface areas of different adsorbents are decreased by increasing CuO content, calcination temperature and K<sup>+</sup>- doping. MgO-support material showed very small catalytic activity in 2-propanol conversion. The investigated system behaved as selective catalyst for dehydrogenation of 2-propanol with selectivity &gt; 80%. The catalytic activity increased by increasing CuO content and decreased by increasing the calcination temperature within 400-900 °C. K<sup>+</sup> - doping increased the catalytic activity and catalytic durability.

In situ dilatometric and impedance spectroscopic study of core–shell like structures: insights into the exceptional catalytic activity of nanocrystalline Cu-doped CeO2

2015 ◽  
Vol 3 (16) ◽  
pp. 8369-8379 ◽  
Author(s):  
Philippe Knauth ◽  
Howard Saltsburg ◽  
Johanna Engel ◽  
Harry L. Tuller
Keyword(s):  
Catalytic Activity ◽  
Phase Separation ◽  
Spectroscopic Study ◽  
Catalytic Properties ◽  
Core Shell ◽  
Doped Ceo2 ◽  
Dopant Redistribution ◽  
The Impact

The impact of temperature and pO2 driven dopant redistribution and phase separation on thermo-mechanical, electrical and catalytic properties of Cu–doped CeO2 nanoparticles is explored.

Sign in / Sign up

Export Citation Format

Share Document