scholarly journals Investigation of the Catalytic Performance of a Novel Nickel/Kit-6 Nanocatalyst for the Hydrogenation of Vegetable Oil

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
M. A. Usman ◽  
T. O. Alaje ◽  
V. I. Ekwueme ◽  
E. A. Awe
Keyword(s):  
Vegetable Oil ◽  
Activated Carbons ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Performance ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Ordered Mesoporous Materials ◽  
Ordered Mesoporous ◽  
Wet Impregnation Method

Highly ordered mesoporous materials are opening the door to new opportunities in catalysis due to their extraordinary intrinsic features. In this study, Nickel was supported on highly ordered mesoporous silica (KIT-6) by the wet impregnation method, and its performance in the hydrogenation of edible vegetable oil was compared with that of Ni/Activated carbon prepared using the same method as well as with unsupported Nickel. The degree of conversion for the 50 : 50 Ni/KIT-6 was 81%, as compared to the 29% obtained with 50 : 50 Ni/Activated carbons. The conversion was found to improve with an increase in mass of supported Nickel on KIT-6 thus 20 : 80 Ni/KIT-6 and 30 : 70 Ni/KIT-6 produced conversions of 71% and 74%, respectively. Key among the benefits of KIT-6 when used as a support material is the very high surface area, open framework of the 3D bicontinuous interconnected channels, and the well-ordered mesopores which bestow on it an advanced mass transfer characteristics.

scholarly journals Activity Evaluation of CoMo Nanoparticles Supported on Meso-microporous Composites in Dibenzothiophene Hydrodesulphurization

2019 ◽  
Vol 15 (1) ◽  
pp. 112-118
Author(s):  
Nastaran Parsafard ◽  
Mohammad Hasan Peyrovi ◽  
Zahra Mohammadian ◽  
Niloofar Atashi
Keyword(s):  
Activation Energy ◽  
High Surface ◽  
High Surface Area ◽  
Fixed Bed ◽  
Catalytic Performance ◽  
Fixed Bed Reactor ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Ft Ir ◽  
Adsorption Desorption

CoMo-supported mesoporous catalysts were synthesized by 50 wt% of HZSM-5 and 50 wt% of FSM-16, KIT-6, and MCM-48. These catalysts were prepared by the wet-impregnation method and pre-sulfided with CS2. The catalytic performance was evaluated for HDS reaction of dibenzothiophene over a temperature range of 250-400 °C in a micro fixed-bed reactor under atmospheric pressure. The supported CoMo bimetallic catalysts were characterized by XRD, XRF, FT-IR, N2 adsorption-desorption, and SEM. The CoMo/KIT-6/HZSM-5 indicate higher activity than other catalysts at 400 °C for dibenzothiophene hydrodesulphurization. Also, the best selectivity to cyclohexylbenzene (CHB) is related to CoMo/FSM-16/HZSM-5. The activation energy was also calculated for all prepared catalysts for the conversions of less than 10%; according to which, the activation energy for CoMo/KIT-6/HZSM-5 is less than other catalysts (~21 kJ/mol) which can be related to the appropriate pore size and high surface area of the support. Copyright © 2020 BCREC Group. All rights reserved 

scholarly journals Catalytic Flash Gasification of EFB for Hydrogen Production Using Zeolite Supported Metal Oxide Catalysts

2016 ◽  
Vol 707 ◽  
pp. 166-174 ◽  
Author(s):  
Yun Hin Taufiq-Yap ◽  
Davin Kin Yew Yap
Keyword(s):  
Hydrogen Production ◽  
High Surface ◽  
High Surface Area ◽  
Green Energy ◽  
High Dispersion ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Supported Metal Oxide ◽  
Xrd Patterns ◽  
Wet Impregnation Method

Empty fruit bunch (EFB) waste is produced in large amount in Malaysia from intense oil palm agriculture activity. Direct usage of EFB as a source of energy is not economically feasible and ideally should be upgraded before it can produce green energy economically. Current gasification processes produces a lot of tar while yielding low amount of hydrogen. Flash gasification of EFB with the presence of catalysts shows improvements over the uncatalysed reaction. In this study, by using a high surface area support catalyst of ZSM-5 with the presence of 1% Ni, Zn, or Fe metal loading is sufficient to enhance the hydrogen production. ZSM-5, NiO/ZSM-5, CuO/ZSM-5, Fe2O3/ZSM-5 and ZnO/ZSM-5 catalyst with 1 wt % loading were prepared via the wet impregnation method. XRD patterns of the prepared catalysts shows almost identical peaks patterns which indicates high dispersion of dopants on the support catalyst Flash gasification was carried out at 900°C under isothermal heating conditions with 10 sccm 4.99% O2 diluted in He. Syngas produced was then analysed using an online quadrupole mass spectrometer. Catalytic activity for hydrogen production is the highest for NiO/ZSM-5 followed by ZnO/ZSM-5, Fe2O3/ZSM-5, ZSM-5.

Effects of Ultrasound Irradiation on Synthesis of Solid Acid Catalysts

2016 ◽  
Vol 701 ◽  
pp. 67-72 ◽  
Author(s):  
Mariam Ameen ◽  
Mohammad Tazli Azizan ◽  
Suzana Yusup ◽  
Anita Ramli ◽  
Madiha Yasir ◽  
...  
Keyword(s):  
Surface Area ◽  
Solid Acid ◽  
High Surface ◽  
High Surface Area ◽  
Ultrasound Irradiation ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Wet Impregnation Method

The studies based on morphological characterization to assess the effects of ultrasound irradiation on synthesis of solid acid catalysts. Three sets of catalyst formulation were synthesized by both wet impregnation method and ultrasound assisted methods with different wt. % of Ni loading on γ-Al2O3. The XRD, BET, TEM and FESEM techniques were used to characterize the nano-particles. Physicochemical characterization revealed that the synthesized catalysts particles using ultrasound irradiation were in nano size range (1-24.5 nm) with equal dispersion of metal oxide, high surface area with increase of metal loading and high phase purity than the catalysts synthesized conventional method. These catalysts were also found in various crystal structures like cubic, monoclinic and tetrahedral. The use of ultrasound irradiation has great significance over the wet impregnation method in relation to the rate of synthesis of nanocatalysts. The high surface area, high thermal stability and small particle size (up to 1 nm) are the basic elements for high activity of solid acid catalysts in hydrocracking and hydrodeoxygenation of various feedstock in petroleum industries.

scholarly journals Oxidative dehydrogenation of isobutane over supported V-Mo mixed oxides

2010 ◽  
Vol 75 (8) ◽  
pp. 1115-1124 ◽  
Author(s):  
Gheorghiţa Mitran ◽  
Ioan-Cezar Marcu ◽  
Adriana Urdă ◽  
Ioan Săndulescu
Keyword(s):  
Oxidative Dehydrogenation ◽  
Mixed Oxides ◽  
Catalytic Performance ◽  
Molybdenum Oxides ◽  
Impregnation Method ◽  
N2 Adsorption ◽  
Wet Impregnation ◽  
Vis Spectroscopy ◽  
Wet Impregnation Method ◽  
Oxidative Dehydrogenation Of Isobutane

Vanadium-molybdenum oxides supported on Al2O3, CeO2 and TiO2 were prepared by a ?wet? impregnation method, characterized using DRX, N2 adsorption, UV-Vis spectroscopy, electrical conductivity measurements and tested in the oxidative dehydrogenation of isobutane. The catalytic performance in the oxidative dehydrogenation of isobutane at 400-550?C depended on the nature of support and on the content of VMoO species on the support. The catalysts supported on alumina were more active and selective than those supported on ceria and titania.

scholarly journals Catalytic Combustion of Dimethyl Disulfide on Bimetallic Supported Catalysts Prepared by the Wet-Impregnation Method

2019 ◽  
Author(s):  
Junan Gao ◽  
Song Gao ◽  
Jun Wei ◽  
Hong Zhao ◽  
Jie Zhang
Keyword(s):  
Synergistic Effect ◽  
Catalytic Combustion ◽  
Supported Catalysts ◽  
Dimethyl Disulfide ◽  
Catalytic Performance ◽  
Sulfur Poisoning ◽  
Impregnation Method ◽  
Promoting Effect ◽  
Wet Impregnation ◽  
Wet Impregnation Method

In this paper, the catalytic combustion of DMDS (dimethyl disulfide, CH3SSCH3) over bimetallic supported catalysts were investigated. It was confirmed that Cu/γ-Al2O3-CeO2 showed best catalytic performance among the five single-metal catalysts. Furthermore, six different metals were separately added into Cu/γ-Al2O3-CeO2 to investigate the promoting effect. The experiments revealed Pt as the most effective promoter and the the best catalytic performance was achieved as the adding amount of 0.3 wt%. The characterization results indicated that high activity and resistance to sulfur poisoning of Cu-Pt/γ-Al2O3-CeO2 could be attributed to the synergistic effect between Cu and Pt.

Influence of Shaping on Pd and Pt/TiO2 Catalysts in Total Oxidation of VOCs

2011 ◽  
Vol 324 ◽  
pp. 162-165 ◽  
Author(s):  
Tarek Barakat ◽  
Gauthier Finne ◽  
Manuel Franco ◽  
Renaud Cousin ◽  
Jean Marc Giraudon ◽  
...  
Keyword(s):  
Surface Area ◽  
Catalytic Performance ◽  
Powder Materials ◽  
Impregnation Method ◽  
Total Oxidation ◽  
Wet Impregnation ◽  
Wet Impregnation Method ◽  
Catalytic Test

The catalytic performance of a commercial TiO2 was investigated towards the total oxidation of toluene. A variety of two titania supports was used in this work, shaped (pellets) and non-shaped (powder) materials. 0.5wt% Pd or Pt were impregnated onto both types of titania supports using the wet impregnation method. A decrease in the surface area of the obtained catalysts was noticed after the catalytic test, although it was still much higher than that of classical titania supports. The catalysts were tested in the total oxidation of toluene, and a major decrease in activity was noticed for Pt impregnated “shaped” supports.

scholarly journals Catalytic Combustion of Dimethyl Disulfide on Bimetallic Supported Catalysts Prepared by the Wet-Impregnation Method

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 994 ◽  
Author(s):  
Junan Gao ◽  
Song Gao ◽  
Jun Wei ◽  
Hong Zhao ◽  
Jie Zhang
Keyword(s):  
Synergistic Effect ◽  
Catalytic Combustion ◽  
Supported Catalysts ◽  
Dimethyl Disulfide ◽  
Catalytic Performance ◽  
Sulfur Poisoning ◽  
Impregnation Method ◽  
Promoting Effect ◽  
Wet Impregnation ◽  
Wet Impregnation Method

In this paper, the catalytic combustion of DMDS (dimethyl disulfide, CH3SSCH3) over bimetallic supported catalysts were investigated. It was confirmed that Cu/γ-Al2O3-CeO2 showed best catalytic performance among the five single-metal catalysts. Furthermore, six different metals were separately added into Cu/γ-Al2O3-CeO2 to investigate the promoting effect. The experiments revealed Pt as the most effective promoter and the best catalytic performance was achieved as the adding amount of 0.3 wt%. The characterization results indicated that high activity and resistance to sulfur poisoning of Cu-Pt/γ-Al2O3-CeO2 could be attributed to the synergistic effect between Cu and Pt.

scholarly journals Ni Supported on Natural Clays as a Catalyst for the Transformation of Levulinic Acid into γ-Valerolactone without the Addition of Molecular Hydrogen

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3448
Author(s):  
Adrián García ◽  
Rut Sanchis ◽  
Francisco J. Llopis ◽  
Isabel Vázquez ◽  
María Pilar Pico ◽  
...  
Keyword(s):  
Levulinic Acid ◽  
Low Cost ◽  
Catalytic Performance ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Surface Areas ◽  
Natural Clays ◽  
Wet Impregnation Method ◽  
Clay Materials ◽  
Automotive Fuels

γ-Valerolactone (GVL) is a valuable chemical that can be used as a clean additive for automotive fuels. This compound can be produced from biomass-derived compounds. Levulinic acid (LA) is a compound that can be obtained easily from biomass and it can be transformed into GVL by dehydration and hydrogenation using metallic catalysts. In this work, catalysts of Ni (a non-noble metal) supported on a series of natural and low-cost clay-materials have been tested in the transformation of LA into GVL. Catalysts were prepared by a modified wet impregnation method using oxalic acid trying to facilitate a suitable metal dispersion. The supports employed are attapulgite and two sepiolites with different surface areas. Reaction tests have been undertaken using an aqueous medium at moderate reaction temperatures of 120 and 180 °C. Three types of experiments were undertaken: (i) without H2 source, (ii) using formic acid (FA) as hydrogen source and (iii) using Zn in order to transform water in hydrogen through the reaction Zn + H2O → ZnO + H2. The best results have been obtained combining Zn (which plays a double role as a reactant for hydrogen formation and as a catalyst) and Ni/attapulgite. Yields to GVL higher than 98% have been obtained at 180 °C in the best cases. The best catalytic performance has been related to the presence of tiny Ni particles as nickel crystallites larger than 4 nm were not present in the most efficient catalysts.

Characterization of Wet Impregnation Method for Catalytic Microcombustor by Using Platinum

2014 ◽  
Vol 699 ◽  
pp. 163-168
Author(s):  
Nazri Murat Muhamad ◽  
Azman Miskam Muhamad ◽  
Ahmad Mohd Azmier ◽  
Zainal Alimuddin Zainal Alauddin ◽  
Zulfikar Ishak Mohammad
Keyword(s):  
High Surface ◽  
Catalyst Support ◽  
Propargyl Alcohol ◽  
Support Surface ◽  
Impregnation Method ◽  
Surface Porosity ◽  
Wet Impregnation ◽  
Surface Areas ◽  
Wet Impregnation Method

The wet impregnation method for catalytic microcombustor was characterized by using platinum as a catalyst. The main purpose of this study is to increase the surface porosity of the catalyst support. A high surface porosity indicates that a high amount of catalyst was deposited within the surface areas. The performance of the catalytic microcombustor improves with increasing catalytic surface area. The stainless steel catalyst support was treated with sulfuric acid solution containing polyvinyl (3.89 wt%) and propargyl alcohol (1.48 wt%). Combustion test was performed using LPG-air to test the performance of the catalyst. The surface support treated with polyvinyl (PVA) showed a higher surface porosity and combustion blow-out limit compared with propargyl alcohol. The combustion mode changes from surface to submerged combustion after the catalyst was deposited in the support surface.

scholarly journals Sustainable Carbon as Efficient Support for Metal-Based Nanocatalyst: Applications in Energy Harvesting and Storage

Molecules ◽  
2020 ◽  
Vol 25 (14) ◽  
pp. 3123
Author(s):  
Mireia Buaki-Sogó ◽  
Leire Zubizarreta ◽  
Marta García-Pellicer ◽  
Alfredo Quijano-López
Keyword(s):  
Activated Carbon ◽  
Heterogeneous Catalysts ◽  
Activated Carbons ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Performance ◽  
Co2 Methanation ◽  
Material Recycling ◽  
Different Origins ◽  
And Storage

Sustainable activated carbon can be obtained from the pyrolysis/activation of biomass wastes coming from different origins. Carbon obtained in this way shows interesting properties, such as high surface area, electrical conductivity, thermal and chemical stability, and porosity. These characteristics among others, such as a tailored pore size distribution and the possibility of functionalization, lead to an increased use of activated carbons in catalysis. The use of activated carbons from biomass origins is a step forward in the development of more sustainable processes enhancing material recycling and reuse in the frame of a circular economy. In this article, a perspective of different heterogeneous catalysts based on sustainable activated carbon from biomass origins will be analyzed focusing on their properties and catalytic performance for determined energy-related applications. In this way, the article aims to give the reader a scope of the potential of these tailor-made sustainable materials as a support in heterogeneous catalysis and future developments needed to improve catalyst performance. The selected applications are those related with H2 energy and the production of biomethane for energy through CO2 methanation.

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