scholarly journals Anatase titania-vanadium polyphosphomolybdate as an efficient and reusable nano catalyst for desulphurization of gas oil

2014 ◽  
Vol 79 (9) ◽  
pp. 1099-1110 ◽  
Author(s):  
Rezvani Ali ◽  
Shojaei Fallah ◽  
Zonoz Mohamadi
Keyword(s):  
Sulfur Compound ◽  
Anatase Phase ◽  
Sol Gel ◽  
Practical Method ◽  
Gas Oil ◽  
Titanium Tetraisopropoxide ◽  
Oxidative Desulphurization ◽  
Anatase Titania ◽  
Nano Catalyst ◽  
20 Nm

(Bu4N)4H[PMo10V2O40]-TiO2 nanocomposite has been synthesized by a reaction of (Bu4N)4H[PMo10V2O40] with titanium tetraisopropoxide at 100 ?C via sol-gel method. The crushed nano layer of anatase phase is 20 nm in nature and fixing of (Bu4N)4H[PMo10V2O40] decreases its size. This nano Polyphosphomolybdate was shown be able to oxidative desulphurization of simulated gas oil with high S conversion (more than 98%). In the present work, efficient oxidative desulphurization of gas oil and simulated gas oil with formic acid/hydrogen peroxide system is reported. This system provides an efficient, convenient and practical method for scavenging sulfur compound.

Cement Bonded Sol-Gel TiO2 Powder Photocatalysis for Phenol Removal

2015 ◽  
Vol 776 ◽  
pp. 271-276 ◽  
Author(s):  
Nor Hafizah ◽  
Iis Sopyan
Keyword(s):  
Anatase Phase ◽  
Sol Gel ◽  
Phenol Degradation ◽  
Xrd Analysis ◽  
Hydrolysis Rate ◽  
Molar Ratio ◽  
Synthesis Process ◽  
Phenol Removal ◽  
Titanium Tetraisopropoxide ◽  
Degussa P25

Photocatalysis has been proven effective in controlling various environmental problems originated by pollutions both in liquid and gaseous phases. Titanium dioxide (TiO2) is well known the most practical photocatalyst as it has high photocatalytic efficiency, low band gap energy, and no toxicity. Various chemical methods have been tried to produce TiO2 photocatalyst powder with high activity. In this study, sol-gel method has been employed to produce nanosized TiO2 photocatalyst particles and its physical properties and photocatalytic activity in phenol degradation test were compared with the commercial TiO2 powder, Degussa P25. The synthesis process was carried out through hydrolysis of titanium tetraisopropoxide (TPT) and methanol where the molar ratio of water to TPT was monitored to control the hydrolysis rate. From X-Ray Diffraction (XRD) analysis, the sol-gel TiO2 powder obtained was fully in anatase structure with high crystallinity. Scanning Electron Microscope (SEM) measurement showed that the powder was in nanoto sub-micron size, spherical in shape, and tightly agglomerated. Thermal analysis confirmed that sol-gel derived amorphous TiO2 powder transformed to anatase phase after 400°C calcination. The test on photocatalytic performance conducted using aqueous solution of phenol as the representative of water pollutant examined in this study showed that the sol-gel TiO2 powder is more efficient in degrading phenol compared to one of the most active photocatalysts commercially available, Degussa P25.

Europium Doped Titania Nanocomposites with Enhanced Photocatalytic Activity towards the Degradation of Partially Hydrolysis Polyacrylamide

2011 ◽  
Vol 391-392 ◽  
pp. 219-224
Author(s):  
Jin Huan Li ◽  
Hong Bo Fang ◽  
Wei Wang ◽  
Gui Fan Liu ◽  
Shao Dong Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Oil Recovery ◽  
Inductively Coupled Plasma ◽  
Diffuse Reflectance Spectroscopy ◽  
Uv Light ◽  
Anatase Phase ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Surface Shape ◽  
Titanium Tetraisopropoxide

Nanocrystals with different Eu3+ doping levels (%) were prepared by sol-gel and hydrothermal synthetic method using titanium tetraisopropoxide (TTIP) as titanium source. The products exhibited anatase phase structure, mesoporosity, and interesting surface compositions with three oxygen species and two titanium species. The crystallite sizes, crystal form, surface shape, composition and optical property of catalysts were characterized by X-ray diffraction patterns, UV-Vis diffuse reflectance spectroscopy, XPS and inductively coupled plasma atomic emission spectroscopy. The products were used as the photocatalysts to degrade a partially hydrolysis polyacrylamide (HPAM) under UV-light irradiation, a very useful polymer in oil recovery. For comparison, Degussa P25 and as-prepared pure TiO2 were also tested under the same conditions. The enhanced photocatalytic activity was obtained on as-prepared Eu3+ composites, and the reasons were explained.

scholarly journals Effect of Ultrasound Irradiation on the Synthesis of Hydroxyapatite/Titanium Oxide Nanocomposites

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 959
Author(s):  
A. K. Sánchez-Hernández ◽  
J. Martínez-Juárez ◽  
J. J. Gervacio-Arciniega ◽  
R. Silva-González ◽  
M. J. Robles-Águila
Keyword(s):  
Titanium Oxide ◽  
Irradiation Time ◽  
Anatase Phase ◽  
Sol Gel ◽  
Ultrasound Irradiation ◽  
Nanoparticle Shape ◽  
Calcium Phosphorus ◽  
Co Precipitation ◽  
Nanocomposite Powders ◽  
20 Nm

Bioceramic materials, such as hydroxyapatite, Ca10(PO4)6(OH)2, (HAp), can be chemically bound to bone tissue; since they are bioactive and biocompatible. HAp, titanium oxide (TiO2), and hydroxyapatite/titanium oxide (HAp/TiO2) nanocomposite nanoparticles were obtained by ultrasound irradiation assisted by sol-gel and co-precipitation methods at different time intervals, using Ca(NO3)2•4H2O, (NH4)2HPO4, and TiOSO4•xH2O as calcium, phosphorus, and titanium sources, respectively. HAp, TiO2, and HAp/TiO2 nanocomposite powders were characterized by X-ray Diffraction (XRD) and Raman Spectroscopy. The percentages of anatase phase for TiO2 and of monoclinic and hexagonal phases for HAp were quantified by Rietveld refinement. Furthermore, sample crystallinity in each material was enhanced by increasing the ultrasound irradiation time. The nanoparticle shape was semi-spherical, agglomerated, and between 17 and 20 nm in size. The agglomeration of particles in the samples was corroborated with a Field Emission Scanning Electron Microscope (FESEM).

scholarly journals Deep desulphurization of gas oil and model compounds by anatase nanocomposite sandwich type polyoxometalate as a novel, reusable and green nano mercaptan scavenger

2013 ◽  
Vol 78 (1) ◽  
pp. 129-136 ◽  
Author(s):  
Fallah Shojaei ◽  
Ali Rezvani ◽  
Farokhzad Zonoz
Keyword(s):  
Acetic Acid ◽  
Model Compound ◽  
Active Catalyst ◽  
Practical Method ◽  
Catalyst System ◽  
High Yield ◽  
Gas Oil ◽  
Model Compounds ◽  
Oxidative Desulphurization ◽  
Sandwich Type

Oxidative desulphurization of gas oil and model compounds that exist in gas oil with hydrogen peroxide/acetic acid using nanoparticle (Bu4N)7H3[P2W18Cd4(Br)2O68]-TiO2 ((Bu4N)7H3[P2W18Cd4]-TiO2) as a nano scavenger has been studied. This sandwich-type nanoparticle was shown be able to scavenge hydrogen sulfide and mercaptans with high yield. The addition of acetic acid enhanced the conversion. This system provides an efficient, convenient and practical method for scavenging of sulphur compound. The (Bu4N)7H3[P2W18Cd4]-TiO2 nanoparticle was very active catalyst system for the model compound oxidation, while other polyoxometalate systems were much less active.

Preparation of TiO2 Nanorod Arrays by Electrophoretic Deposition of Titania Nanoparticles

2007 ◽  
Vol 119 ◽  
pp. 67-70 ◽  
Author(s):  
Zhang Qi ◽  
Yong Joo Kim ◽  
Wan In Lee
Keyword(s):  
Electrophoretic Deposition ◽  
Anatase Phase ◽  
Sol Gel ◽  
Titania Nanoparticles ◽  
Nanorod Arrays ◽  
Anodized Aluminum ◽  
Sem Images ◽  
Tio2 Nanorod ◽  
Tio2 Nanorod Arrays ◽  
Anatase Titania

The TiO2 nanorod arrays were fabricated by the electrophoretic deposition (EPD) of the 4.5 and 7 nm-sized anatase titania nanoparticles using the anodized aluminum oxide (AAO) as the template. Each of the TiO2 nanoparticle was plus-charged by adjusting the pH of the electrolyte. The growth rate of TiO2 nanorod arrays with this new method was dramatically higher than that of the arrays obtained from the conventional EPD method employing sol-gel solutions. In addition, the robust anatase-phase TiO2 nanorod arrays were obtained without post-thermal treatment. The scanning electron microscope (SEM) images showed that the titania nanoparticles were tightly interconnected to form the highly uniform and well-organized TiO2 nanorod arrays. The diameter of the TiO2 nanorod arrays was 55~58 nm with the length of 15 0m, which corresponded to the size of AAO templates.

The Study on the Decomposition of Azo Dye by La-Modified TiO2

2010 ◽  
Vol 123-125 ◽  
pp. 276-279
Author(s):  
Kuo Shan Yao ◽  
Yung Hsu Hsieh ◽  
Yu Jie Chang ◽  
Ching Hsing Lin ◽  
Chen Yu Chang ◽  
...  
Keyword(s):  
Azo Dye ◽  
Acidic Solution ◽  
Supported Catalysts ◽  
Anatase Phase ◽  
Sol Gel ◽  
Rutile Phase ◽  
Desorption Process ◽  
Sol Gel Process ◽  
Photocatalytic Activities ◽  
20 Nm

The La/TiO2 photocatalyst was prepared by lanthanum into TiO2 structure in a sol-gel process. The catalyst was characterized by field-emission scanning electron microscope (FE-SEM), X-ray diffractometer (XRD), ESCA, and Brunauer Emmett Teller (BET) analyses. Photocatalytic activities of the supported catalysts were examined through decomposition process of azo-dye Acid Yellow 17 solution under UV irradiation. The results showed that the particle size of TiO2 is about 20 nm, and the particle of La/TiO2 is about 10 nm. The crystal structure is mainly in anatase phase, the contents of the rutile phase increase with the increase of the amount of doped lanthanum. The adsorption capacity of La/TiO2 catalysts increases with lanthanum dosage in the acidic solution. The contribution of actual photodecomposition was determined by desorption process, after the photocatalytic reaction. In the acidic solution, better photodecomposition efficiency is achieved than in the neutral or alkaline solution. The experiments demonstrated that the optimum doping of La at 10 mol %, the maximum photodecomposition in dye concertration at 15 mg L-1 and photocatalytic dosage at 0.75 g L-1, achieving the highest effect.

Influence of Mass Ratio of Aquadest and TTIP on the Synthesis of TiO2 Nanoparticles to Improve the Performance of DSSC with Beta-Carotene as Sensitizer

2014 ◽  
Vol 896 ◽  
pp. 481-484 ◽  
Author(s):  
Nafi'ah Ardhani ◽  
Agus Supriyanto ◽  
Akhmad Herman Yuwono ◽  
Risa Suryana
Keyword(s):  
Crystal Size ◽  
Anatase Phase ◽  
Sol Gel ◽  
Beta Carotene ◽  
Rutile Phase ◽  
Bandgap Energy ◽  
Mass Ratio ◽  
Titanium Tetraisopropoxide ◽  
X Ray Diffraction ◽  
X Ray

TiO2 nanoparticles have been successfully synthesized using the sol-gel method with main materials of titanium tetraisopropoxide (TTIP) and HClO4 solutions. Mass ratios (Rw) of aquadest and TTIP were 0.85, 2.00, and 3.50 which were going to be investigated in crystallization of TiO2 phases. Pre-heating was performed on TiO2 at 60°C for one day then it was annealed at 150°C for 3 hours. The DSSC structure was formed by using the synthesized-TiO2 as semiconductor material and beta-carotene as dye sensitizer. The x-ray diffraction (XRD) spectrum indicated that TiO2 peaks had anatase phases on crystal orientation of (101), (004), and (200) while TiO2 of rutile phase only appeared on orientation of (211). The highest intensity for all Rw was dominated by (101) anatase phase. From XRD spectrum data of (101) peak, the Scherrer’s method predicted that crystal size of TiO2 was 3.48 nm, 4.36 nm, and 4.47 nm for Rw of 0.85, 2.00, and 3.50, respectively. The Tauc’s method was applied on the UV-Vis data that predicted the bandgap energy (Eg) of TiO2 for Rw of 2.00 (Eg=3.14 eV) was higher than Rw of 0.85 (Eg=3.02 eV) and 3.50 (Eg=3.04 eV). The I-V characteristic calculation of DSSC structures were obtained that the efficiency optimum is 0.01% for Rw of 2.00. It is considered that bandgap energy value correlated to stability of Ti-OH bonds that caused the exited-electrons are easily injected to conduction band of TiO2. The performance of DSSC using the synthesized-TiO2 which consists of anatase and rutile can be improved about ten times compared to that using the pure-TiO2 rutile.

scholarly journals Synthesis and Characterization of New nano catalyst Mo-Ni /TiO2- γAl2O3 for Hydrodesulphurization of Iraqi Gas Oil

2021 ◽  
Vol 18 (4(Suppl.)) ◽  
pp. 1557
Author(s):  
Dalya Jasim Ahmed ◽  
Basim Ibrahim Al-Abdaly ◽  
Sattar Jalil Hussein
Keyword(s):  
Sulfur Content ◽  
Sol Gel ◽  
Sulfur Removal ◽  
Operating Conditions ◽  
Bet Surface Area ◽  
Vacuum Impregnation ◽  
Gas Oil ◽  
Laboratory Unit ◽  
Nano Catalyst ◽  
Al2o3 Catalyst

   A new nano-sized NiMo/TiO2-γ-Al2O3 was prepared as a Hydrodesulphurization catalyst for Iraqi gas oil with sulfur content of 8980 ppm, supplied from Al-Dura Refinery. Sol-gel method was used to prepare TiO2- γ-Al2O3 nano catalyst support with 64% TiO2, 32% Al2O3, Ni-Mo/TiO-γ-Al2O3 catalyst was prepared under vacuum impregnation conditions to loading metals with percentage 3.8 wt.% and 14 wt.% for nickel and molybdenum respectively while the percentage for alumina, and titanium became 21.7, and 58.61 respectively. The synthesized TiO2- γ-Al2O3 nanocomposites and Ni-Mo /TiO2- γ-Al2O3 Nano catalyst were then characterized by XRD, AFM, and BET surface area, SEM, XRF, and FTIR. The performance of the synthesized catalyst for removing sulfur compounds was conducted through the pilot HDS laboratory unit, various temperatures range 275oC to 375°C, LHSV 1 h-1 were studied; moreover, the effect of LHSV 1 to 4 h-1 on the percentage of sulfur removal was also studied at the temperature of the best removal with constant pressure 35 bar and H2/HC ratio 200cm3/200cm3. The sulfur content results generally revealed that there was a substantial decrease at all operating conditions used, while the maximum sulfur removal was 87.75% in gas oil on Ni-Mo/TiO2-γ-Al2O3 catalyst at temperature 375˚C and LHSV 1h-1.

SYNTHESIS AND CHARACTERIZATION OF TITANIUM DIOXIDE NANOPARTICLES COATED ON FLY ASH

2006 ◽  
Vol 05 (04n05) ◽  
pp. 657-662
Author(s):  
N. WETCHAKUN ◽  
S. PHANICHPHANT
Keyword(s):  
Titanium Dioxide ◽  
Fly Ash ◽  
Titanium Dioxide Nanoparticles ◽  
Phase Particle ◽  
Anatase Phase ◽  
Sol Gel ◽  
Ammonia Solution ◽  
Alcoholic Solution ◽  
Absolute Ethanol ◽  
Titanium Tetraisopropoxide

Titanium dioxide ( TiO 2) nanoparticles in the anatase phase were coated on fly ash by using a sol–gel method. The TiO 2 nanoparticles coated on fly ash were produced from titanium tetraisopropoxide ( Ti ( OPr i )4 3.3 M ) in absolute ethanol, and the fly ash was added into this alcoholic solution. The ratio of TiO 2 nanoparticles to fly ash in the coating process was 1:10 by weight. The ethanolic solution was loaded into a pouch type cellophane membrane and placed for 1 h in a clear solution which containing 1:1 (v/v) ratio of absolute ethanol and distilled water with 0.5–1% concentrated (25%) ammonia solution. After the dialysis process was completed, the mixture was then allowed to dry in an oven at 100–110°C and was calcined in a furnace over the temperatures range of 400–800°C. TiO 2 nanoparticles were then analyzed and characterized by using the techniques of XRD, SEM, EDS, TEM, and BET. The crystalline sizes of anatase form were found to be in the range of 15–20 nm. The characteristics of TiO 2 nanoparticles coated on fly ash were further investigated by utilizing SEM and EDS methodologies. The correlations among crystalline phase, particle size, morphology, and specific surface area were investigated.

Self - Cleaning Property of Ag/TiO2 Thin Film

2020 ◽  
Vol 1010 ◽  
pp. 397-404
Author(s):  
Kamrosni Abdul Razak ◽  
Dewi Suriyani Che Halin ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Azliza Azani ◽  
Mohd Arif Anuar Mohd Salleh ◽  
...  
Keyword(s):  
Thin Film ◽  
Anatase Phase ◽  
Sol Gel ◽  
Nitrate Solution ◽  
Silver Nitrate Solution ◽  
Titanium Tetraisopropoxide ◽  
Water Contact ◽  
Ito Glass ◽  
Coating Method ◽  
Self Cleaning

Ag/TiO2 thin film was prepared by the sol-gel method through the hydrolysis of titanium tetraisopropoxide and silver nitrate solution. Spin coating method was used to get uniform film on ITO glass substrate followed by annealing process for 1 hour. After that, all the samples were characterised using GIXRD and FESEM and undergone water contact angle test and MB degradation. Silver ion concentrations were varied to observe the effect on crystalline state, morphology, wettability and photocatalytic properties. The results showed that Ag/TiO2 thin film was in anatase phase and it could degrade nearly 70% of methylene blue after 150 min illumination. The formed Ag/TiO2 thin film has excellent self-cleaning property with compact, continuous, smooth, and good hydrophilicity property.

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