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 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.

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.

Preparation of Strong Acid Catalysts by Sulfate Treatment of Calcined Boehmite

1992 ◽  
Vol 57 (11) ◽  
pp. 2241-2247 ◽  
Author(s):  
Tomáš Hochmann ◽  
Karel Setínek
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
Aluminum Sulfate ◽  
Solid Acid ◽  
Strong Acid ◽  
Acid Strength ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Preparation Methods ◽  
Indicator Method

Solid acid catalysts with acid strength of -14.52 < H0 < -8.2 were prepared by sulfate treatment of the samples of boehmite calcined at 105-800 °C. Two preparation methods were used: impregnation of the calcined boehmite with 3.5 M H2SO4 or mixing of the boehmite samples with anhydrous aluminum sulfate, in both cases followed by calcination in nitrogen at 650 °C. The catalysts were characterized by measurements of surface area, adsorption of pyridine and benzene, acid strength measurements by the indicator method and by catalytic activity tests in the isomerization of cyclohexene, p-xylene and n-hexane. Properties of the catalysts prepared by both methods were comparable.

scholarly journals High Acid Biochar-Based Solid Acid Catalyst from Corn Stalk for Lignin Hydrothermal Degradation

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1623
Author(s):  
Qimeng Jiang ◽  
Guihua Yang ◽  
Fangong Kong ◽  
Pedram Fatehi ◽  
Xiaoying Wang
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Corn Stalk ◽  
Acid Amount ◽  
High Acid

Solid acid catalysts generally show the disadvantage of low acid amount and low recycling rate. To solve these problems, corn stalk-based solid acid catalysts were synthesized through carbonization and sulfonation processes in this work. The results showed that besides the rod-like structure inherited from raw corn stalk, the catalysts contained some small broken pieces on the surface, and the specific surface area varied from 1120 to 1640 m2/g. The functional groups (-SO3H) were successfully introduced onto the surface of the obtained solid acid catalysts. The acid amount varied between 1.2 and 2.4 mmol/g, which was higher than most of solid acid catalysts. The catalyst produced at 800 °C for 6 h in carbonation and then at 150 °C for 8 h in sulfonation had larger specific surface area and more sulfonate groups. In the degradation of lignin, the use of catalyst led to the generation of more aromatic compounds (65.6 wt. %) compared to that without using the catalyst (40.5 wt. %). In addition, a stable yield of reaction (85%) was obtained after four reuses. Therefore, corn stalk is suitable for high-value utilization to prepare high-acid amount biochar-based catalyst.

Zirconium Phosphate with a High Surface Area as a Water-Tolerant Solid Acid

2004 ◽  
Vol 94 (1/2) ◽  
pp. 45-47 ◽  
Author(s):  
Yuichi Kamiya ◽  
Shoko Sakata ◽  
Yusuke Yoshinaga ◽  
Ryuichiro Ohnishi ◽  
Toshio Okuhara
Keyword(s):  
Surface Area ◽  
Zirconium Phosphate ◽  
Solid Acid ◽  
High Surface ◽  
High Surface Area

Porous solid acid with high Surface area derived from emulsion templating and hypercrosslinking for efficient one-pot conversion of cellulose to 5-hydroxymethylfurfural

RSC Advances ◽  
2014 ◽  
Vol 4 (103) ◽  
pp. 59175-59184 ◽  
Author(s):  
Jianming Pan ◽  
Heping Gao ◽  
Yunlei Zhang ◽  
Jun Zeng ◽  
Weidong Shi ◽  
...  
Keyword(s):  
Surface Area ◽  
Solid Acid ◽  
High Surface ◽  
High Surface Area ◽  
Porous Solid ◽  
One Pot ◽  
Emulsion Templating

This work addressed efficient one-pot conversion of cellulose to 5-hydroxymethylfurfural by porous solid acid in the presence of [Emim]Cl.

scholarly journals Mesoporous Crystalline Niobium Oxide with a High Surface Area: A Solid Acid Catalyst for Alkyne Hydration

2020 ◽  
Vol 12 (42) ◽  
pp. 47389-47396 ◽  
Author(s):  
Dinithi Rathnayake ◽  
Inosh Perera ◽  
Alireza Shirazi-Amin ◽  
Peter Kerns ◽  
Shanka Dissanayake ◽  
...  
Keyword(s):  
Surface Area ◽  
Niobium Oxide ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
High Surface ◽  
High Surface Area ◽  
Acid Catalyst

scholarly journals Multifunctional and Environmentally Friendly TiO2–SiO2 Mesoporous Materials for Sustainable Green Buildings

Molecules ◽  
2019 ◽  
Vol 24 (23) ◽  
pp. 4226
Author(s):  
Ghedini ◽  
Menegazzo ◽  
Manzoli ◽  
Di Michele ◽  
Puglia ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Environmentally Friendly ◽  
Green Building ◽  
Structural Features ◽  
Modulated Dsc ◽  
Synthetic Approach ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method

This work deals with the formulation of environmentally friendly, cheap, and readily-available materials for green building applications, providing the function of air purificator by improving the safety and the comfort of an indoor environment. High surface area TiO2–SiO2 samples, prepared by a simple, cost effective, and scalable synthetic approach, proved to be effective in maximizing the properties of each component, i.e., the photocatalytic properties of titania and the high surface area of silica. TiO2 was introduced onto an ordered mesoporous silica Santa Barbara Amorphous-15 (SBA-15), that is featured by interesting insulating features, by using an incipient wetness impregnation method. The photocatalytic activity was evaluated in gas phase oxidation of ethylbenzene, which was selected as model volatile organic compound (VOC) molecule. The morphological, textural and structural features along with the electronic properties, the hydrophilicity and heat capacity of the materials were investigated in depth by scanning electron microscopy, powder X-ray diffraction, N2 physisorption, diffuse reflectance UV-Vis, FT-IR spectroscopies, and modulated DSC (MDSC) dynamic scan. Outstanding performances in the ethylbenzene abatement results are promising for further application in the green building sector.

scholarly journals Mesoporous silica from Parangtritis beach sand templated by CTAB as a support of Mo Metal as a catalyst for hydrocracking of waste palm cooking oil into biofuel

2021 ◽  
Author(s):  
Gesha Desy Alisha ◽  
Wega Trisunaryanti ◽  
Akhmad Syoufian
Keyword(s):  
Mesoporous Silica ◽  
Surface Area ◽  
Weight Ratio ◽  
Beach Sand ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Cooking Oil ◽  
Liquid Products ◽  
Hydrocarbon Compound ◽  
Wet Impregnation Method

Abstract In this study, natural source Parangtritis beach sand was extracted into mesoporous silica (MS). Synthesis of mesoporous silica (MS) was carried out at sodium silicate: CTAB ratio of 1:0.5 (w/w). Monometallic catalyst was used to improve the performance of the catalyst. The monometallic used was Mo metal, which was synthesized using the wet impregnation method. Catalysts were characterized using FTIR, XRD, Surface Area Analyzer (SAA), SEM-EDX, and TEM. MS has pore diameters and surface area of 2.62 nm and 897.3 m2/g. Mo/MS has pore diameters, surface area, and Mo metal concentration of 2.46 nm, 593 m2/g, and 4.75 %. Catalytic activity and selectivity were evaluated in hydrocracking of waste palm cooking oil at 500, 550, and 600 oC, and catalyst: waste palm cooking oil ratio of 1:100, 1:200, and 1:300. The best catalyst will be tested for reusability 3 times through the hydrocracking process. Mo/MS produces better liquid products and hydrocarbon compounds than MS. The results of the conversion of liquid products analyzed using GCMS. The yield of liquid products obtained in the hydrocracking of waste palm cooking oil using Mo/MS with the optimum temperature and the weight ratio of catalyst: feed at 550oC and 1: 300 was 66.99 wt.% with consists of hydrocarbon compound as 62.79 wt.%. The yield of liquid products obtained in the hydrocracking waste palm cooking oil using the used Mo/MS catalyst in the last run was 80.26 wt.% with consist of hydrocarbon compound as 74.13 wt.%.

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