scholarly journals Adsorption and Photocatalytic Study of Phenol Using Composites of Activated Carbon Prepared from Onion Leaves (Allium fistulosum) and Metallic Oxides (ZnO and TiO2)

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 574 ◽  
Author(s):  
Diego Felipe Hernández-Barreto ◽  
Jenny Paola Rodriguez-Estupiñán ◽  
Juan Carlos Moreno-Piraján ◽  
Rocío Sierra Ramírez ◽  
Liliana Giraldo
Keyword(s):  
Zinc Oxide ◽  
Photocatalytic Activity ◽  
Activated Carbon ◽  
Batch Adsorption ◽  
Allium Fistulosum ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Metallic Oxides ◽  
Activating Agent ◽  
Wet Impregnation Method

The aim of this study was to evaluate and compare the adsorption and photocatalytic activity of activated carbon-based photocatalysts. Titanium dioxide (TiO2) and zinc oxide (ZnO) were chosen as semiconductors to prepare composites with activated carbon by the wet impregnation method. Activated carbon was prepared using as starting material onion leaves (Allium fistulosum) and as activating agent phosphoric acid (H3PO4). Photooxidation and batch adsorption of phenol was studied to compare the efficiency of the materials prepared. The results showed that the composite AC–TiO2 has a greater photocatalytic activity and a better adsorption capacity compared to AC–ZnO composite.

Visible light-driven enhanced CO2 reduction by water over Cu modified S-doped g-C3N4

2019 ◽  
Vol 9 (17) ◽  
pp. 4598-4613 ◽  
Author(s):  
Niwesh Ojha ◽  
Abhinav Bajpai ◽  
Sushant Kumar
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Co2 Reduction ◽  
Impregnation Method ◽  
Thin Sheets ◽  
Wet Impregnation ◽  
Visible Light Driven ◽  
Plausible Mechanism ◽  
Wet Impregnation Method

We synthesized Cu modified S-doped g-C3N4 thin sheets using calcination followed by a wet-impregnation method. The photocatalytic activity was studied for reduction of CO2 to CO and CH4 in the presence of water and a plausible mechanism is explained.

Electrocatalytic Hydrogenation of CO2 to Hydrocarbons on Gold Catalyst in the Presence of Ionic Liquid

2021 ◽  
Vol 43 (6) ◽  
pp. 665-665
Author(s):  
Arshid M Ali Arshid M Ali ◽  
Aqeel Taimoor Aqeel Taimoor ◽  
Ayyaz Muhammad Ayyaz Muhammad ◽  
Muhammad A Daous and Usman Saeed Muhammad A Daous and Usman Saeed
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Activated Carbon ◽  
Surface Morphology ◽  
Gold Catalyst ◽  
Impregnation Method ◽  
Electrocatalytic Hydrogenation ◽  
Wet Impregnation ◽  
Wet Impregnation Method ◽  
Electro Catalytic Activity

This study is aimed to investigate the electro-catalytic activity of Au supported on both CeO2 and activated carbon (AC) to convert CO2 to mixture of C1-C4 hydrocarbons in the presence of ionic liquid (IL) 1-butyl-3-methylimidazolium methylsulfonate. The studied catalyst samples were prepared by using simultaneous wet impregnation method. The sample containing 0.6 % Au showed higher electro-catalytic activity than the sample contained 0.3 % Au. Both, the average Au particles size and the transformation of layered non-uniformed semi-oval structure to flaked tiny circular like-structure were mainly responsible for the higher catalytic activity of 0.6Au-CeO2-AC sample. In addition, the overall electro-catalytic activity depends upon the applied reaction voltage. Overall, the presence of IL, the surface morphology, and average Au particles size had played a key role in the electro-catalytic conversion of CO2 to hydrocarbons.

Facile synthesis of a novel nitrogen-doped carbon dot adorned zinc oxide composite for photodegradation of methylene blue

2020 ◽  
Vol 49 (48) ◽  
pp. 17725-17736
Author(s):  
Raji Atchudan ◽  
Thomas Nesakumar Jebakumar Immanuel Edison ◽  
Shanmugam Mani ◽  
Suguna Perumal ◽  
Rajangam Vinodh ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Zinc Oxide ◽  
Uv Light ◽  
Blue Dye ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Carbon Dot ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
Wet Impregnation Method

Nitrogen-doped carbon dot decorated zinc oxide nanoparticles were successfully fabricated by an economical wet-impregnation method and used as a photocatalyst for the degradation of aqueous methylene blue dye under UV-light at room temperature.

scholarly journals Activated Carbon Addition Methods on the Pre-impregnation Process of Co-Mo in Y-Zeolite Ultra Stable: A Properties Exploration and Enhancement of Metals Loaded

2021 ◽  
Vol 12 (2) ◽  
Author(s):  
Yuniawan Hidayat ◽  
Khoirina Dwi Nugrahaningtyas ◽  
Priska Julia Hendrastuti
Keyword(s):  
Activated Carbon ◽  
Impregnation Method ◽  
Carbon Addition ◽  
X Ray Diffraction ◽  
Y Zeolite ◽  
Usy Zeolite ◽  
Wet Impregnation ◽  
Impregnation Process ◽  
X Ray ◽  
Wet Impregnation Method

The amount of loaded Co-Mo metal on the Y-Zeolite Ultra Stable (USY) was increased by the addition of activated carbon in the pre-impregnation process. USY modification was done by adding activated carbon to USY as much as 10 wt%. The process of adding activated carbon is carried out by three methods, i.e., grinding with sucrose binder (ACU1), without sucrose (ACU2), and conducting by ball milling (ACU3). Wet impregnation method was employed to disperse the Co and Mo, sequentially. Composites were characterized using Fourier Transform Infrared (FTIR), X-ray diffraction (XRD), and surface area analyzer (SAA). Metal dispersions were observed by X-ray fluorescence (XRF). The FTIR suggests an interaction between USY and activated car-bon, while the XRD result indicated the none structural transformation of USY zeolite. The SAA analysis showed an increased total pore radius with the activated carbon addition. The XRF confirmed the increasing of total metals dispersion of 6.25% (ACU1); 5.48%(ACU2); 5.18% (ACU3); compare to USY origin with 3.28% metals loaded.

scholarly journals Nickel-based perovskite catalysts: synthesis and catalytic tests in the production of syngas

Cerâmica ◽  
2018 ◽  
Vol 64 (371) ◽  
pp. 436-442 ◽  
Author(s):  
E. O. Moraes Júnior ◽  
J. O. Leite ◽  
A. G. Santos ◽  
M. J. B. Souza ◽  
A. M. Garrido Pedrosa
Keyword(s):  
Impregnation Method ◽  
X Ray Diffraction ◽  
Organic Precursor ◽  
Wet Impregnation ◽  
Partial Oxidation Reaction ◽  
Conversion Level ◽  
Temperature Programmed ◽  
Perovskite Type ◽  
Wet Impregnation Method ◽  
H2 Selectivity

Abstract La1-xSrxNiO3 (x= 0.0, 0.3 or 0.7) perovskite-type oxides were synthesized using the modified proteic gel method and using collagen as an organic precursor. Catalysts of La1-xSrxNiO3/Al2O3 were obtained using the wet impregnation method. The synthesized catalysts were characterized by X-ray diffraction, surface area and temperature-programmed reduction. The catalysts were evaluated in the partial oxidation reaction of methane, and the levels of selectivity to CO, CO2, H2 and H2O were determined. Among the catalysts studied, the catalyst LaNiO3/Al2O3 had the highest methane conversion level (78%) and higher H2 selectivity (55%).

scholarly journals Catalytic Activity Of Cu/η-Al2O3 Catalysts Prepared From Aluminum Scraps In The NH3-SCO and in the NH3-SCR of NO

2021 ◽  
Author(s):  
Nawel Jr ◽  
Thabet Makhlouf ◽  
Gerard Delahay ◽  
Hassib Tounsi
Keyword(s):  
Catalytic Oxidation ◽  
Catalytic Reduction ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Reduction Of No ◽  
Evaporation Method ◽  
Nh3 Scr ◽  
Scr Of No ◽  
Selective Catalytic Oxidation ◽  
Wet Impregnation Method

Abstract Copper loaded η-alumina catalysts with different copper contents have been prepared by impregnation/evaporation method. The catalysts were characterized by XRD, FTIR, BET, UV–vis, H2-TPR and evaluated in the selective catalytic reduction of NO by NH3 and in the selective catalytic oxidation of NH3. The characterization techniques showed that the impregnation/evaporation method permits to obtain highly dispersed copper oxide species on the η-alumina surface when low amount of copper is used (1wt. % and 2 wt.%). The wet impregnation method made it possible to reach a well dispersion of the copper species on the surface of the alumina for the low copper contents Cu(1)-Al2O3 and Cu(2)-Al2O3. The latter justifies the similar behavior of Cu(1)-Al2O3) and Cu(2)-Al2O3 in the selective catalytic oxidation of NH3 where these catalysts exhibit a conversion of NH3 to N2 of the order of 100% at T > 500°C.

Effect of CNTs Support Diameter on Pt Particles Size and Distribution

2007 ◽  
Vol 119 ◽  
pp. 231-234
Author(s):  
Yong Hwan Kim ◽  
Yon Ki Seo ◽  
Young Rae Cho ◽  
Kwang Ho Kim ◽  
Won Sub Chung
Keyword(s):  
Electrochemical Impedance ◽  
Pt Catalyst ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Optimum Diameter ◽  
Electro Oxidation ◽  
Average Size ◽  
Wet Impregnation Method ◽  
Xrd And Tem ◽  
Supported Pt Catalyst

The Platinum catalysts on the carbon nanotubes(CNTs) supports of various diameters were prepared by wet impregnation method using H2PtCl6 precursor. The samples using 100nm, 15~20nm, 10~15nm and 5~10nm diameters of CNTs and carbon nanofibers(CNFs) are named Pt/t- CNFs, Pt/MWNTs20, Pt/MWNTs10 and Pt/MWNTs5, respectively. The effects of CNTs diameter on the Pt particle size and distribution were investigated by the means of powder XRD and TEM observation. In addition, the electro-catalytic characteristics for methanol electro-oxidation were estimated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques. The average size of Pt particles increases as follows; Pt/MWNTs10 < Pt/MWNTs5 < Pt/MWNTs20 < Pt/t-CNFs. The electro-catalytic characteristics of Pt/MWNTs10 and Pt/MWNTs20 are found to be superior in comparison with the others. For preparation of the most effective supported Pt catalyst, the optimum diameter of CNTs support in the range of 10-20nm, is needed.

Preparation of Cr Metal Supported on Sulfated Zirconia Catalyst

2019 ◽  
Vol 948 ◽  
pp. 221-227
Author(s):  
Latifah Hauli ◽  
Karna Wijaya ◽  
Ria Armunanto
Keyword(s):  
Sulfated Zirconia ◽  
Reduction Process ◽  
Catalyst Preparation ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Zirconia Catalyst ◽  
Isotherm Adsorption ◽  
Sulfated Zirconia Catalyst ◽  
Adsorption Desorption ◽  
Wet Impregnation Method

Catalyst of Chromium (Cr) metal supported on sulfated zirconia (SZ) was prepared by wet impregnation method. This study aim to determine the optimal concentration of Cr metal that impregnated on SZ catalyst. Preparation of catalyst was conducted at different concentrations of Cr metal (0.5%, 1%, 1.5% (w/w)), impregnated on SZ catalyst, then followed by the calcinationand reduction process. Catalysts were charaterized by FTIR, XRD, XRF, SAA, TEM, and acidity test. The results showed the Cr/SZ 1% had the highest acidity value of 8.22 mmol/g which confirmed from FTIR spectra. All the crystal phase of these catalysts were in monoclinic. The specific surface area increased with the increasing of Cr metal concentration on SZ catalyst and the isotherm adsorption-desorption of N2 gas observed all the catalysts as mesoporous material. The impregnation process formed particles agglomeration.

scholarly journals {CeO2/Bi2Mo1−xRuxO6} and {Au/Bi2Mo1−xRuxO6} Catalysts for Low-Temperature CO Oxidation

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 947 ◽  
Author(s):  
Edson Edain González ◽  
Ricardo Rangel ◽  
Javier Lara ◽  
Pascual Bartolo-Pérez ◽  
Juan José Alvarado-Gil ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Photoelectron Spectroscopy ◽  
Supported Catalysts ◽  
Pollutant Emissions ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
X Ray ◽  
Low Temperature Co Oxidation ◽  
Carbon Dioxide Co2 ◽  
Wet Impregnation Method

Nowadays, one of the most important challenges that humanity faces is to find alternative ways of reducing pollutant emissions. CeO2/Bi2Mo1−xRuxO6 and Au/Bi2Mo1−xRuxO6 catalysts were prepared to efficiently transform carbon monoxide (CO) to carbon dioxide (CO2) at low temperatures. The systems were prepared in a two-step process. First, Bi2Mo1−xRuxO6 supports were synthesized through the hydrothermal procedure under microwave heating. Then, CeO2 was deposited on Bi2Mo1−xRuxO6 using the wet impregnation method, while the incipient impregnation method was selected to deposit gold nanoparticles. The CeO2/Bi2Mo1−xRuxO6 and Au/Bi2Mo1−xRuxO6 catalysts were characterized using SEM microscopy and XRD. Furthermore, energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy were used. Tests were carried out for the supported catalysts in CO oxidation, and high conversion values, nearing 100%, was observed in a temperature range of 100 to 250 °C. The results showed that the best system was the Au/Bi2Mo0.95Ru0.05O6 catalyst, with CO oxidation starting at 50 °C and reaching 100% conversion at 186 °C.

scholarly journals Deep oxidative desulfurization of model fuels catalysed by immobilized ionic liquid on MIL-100(Fe)

RSC Advances ◽  
2019 ◽  
Vol 9 (38) ◽  
pp. 21804-21809 ◽  
Author(s):  
WanXin Yang ◽  
Guoqing Guo ◽  
Zhihong Mei ◽  
Yinghao Yu
Keyword(s):  
Ionic Liquid ◽  
High Efficiency ◽  
Oxidative Desulfurization ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Wet Impregnation Method

ILs@MIL-100 composites were synthesized via the wet impregnation method and applied in deep oxidative desulfurization of gasoline with high efficiency.

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