Iron Oxide Catalyst for Oxidative Desulfurization of Model Diesel Fuel

2020 ◽  
Vol 1010 ◽  
pp. 418-423
Author(s):  
Nor Atiq Syakila Mohd Nazmi ◽  
Wan Nazwanie Wan Abdullah ◽  
Farook Adam ◽  
Wan Nur Aini Wan Mokhtar ◽  
Noor Fatimah Yahaya ◽  
...  
Keyword(s):  
Iron Oxide ◽  
New Technology ◽  
Oxidative Desulfurization ◽  
Impregnation Method ◽  
X Ray ◽  
Diesel Fuels ◽  
Extraction Solvent ◽  
Tert Butyl Hydroperoxide ◽  
Catalytic Oxidative Desulfurization ◽  
Model Diesel

— The catalytic oxidative desulfurization (Cat-ODS) process has been introduced as a new technology to achieve ultra-low sulphur levels in diesel fuels. In this study, the performance of the alumina supported iron oxide based catalysts doped with cobalt, synthesized via wet impregnation method on the Cat-ODS of the model diesel with the total sulphur 500ppm was investigated using tert-butyl hydroperoxide (TBHP) as an oxidizing agent and N,N-dimethylformamide as an extraction solvent. A series of dopant was being screened. Co/Fe-Al2O3 (10:90) and Co/Fe-Al2O3 (20:80) prepared at 400°C. Overall, the catalytic activity decreased as dopant ratio increased. Catalyst with 10 wt% of Co was successfully removed 96% of thiophene, 100% of DBT and 92% of 4,6-DMDBT in model diesel. Further investigation, potential catalyst that calcined at 400°C contributed higher sulphur removal compared to the catalyst calcined at 500°C. X-ray diffraction analysis (XRD) result showed that Co/Fe-Al2O3 (10:90) prepared at 400°C was amorphous, while micrograph of the field emission scanning electron microscopy (FESEM) illustrated an inhomogeneous distribution of various particle sizes. The energy dispersive X-ray analysis (EDX) result have confirmed the presence of Fe and Co in all of the prepared catalyst.

scholarly journals An Effective Hybrid Heterogeneous Catalyst to Desulfurize Diesel: Peroxotungstate@Metal–Organic Framework

Molecules ◽  
2020 ◽  
Vol 25 (23) ◽  
pp. 5494
Author(s):  
Yan Gao ◽  
Fátima Mirante ◽  
Baltazar de Castro ◽  
Jianshe Zhao ◽  
Luís Cunha-Silva ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Metal Organic Framework ◽  
Oxidative Desulfurization ◽  
Catalytic Efficiency ◽  
Catalytic Performance ◽  
Impregnation Method ◽  
Extraction Solvent ◽  
Metal Organic ◽  
Model Diesel ◽  
Organic Framework

A peroxotungstate composite comprising the chromium terephthalate metal–organic framework MIL-101(Cr) and the Venturello peroxotungstate [PO4{WO(O2)2}4]3− (PW4) has been prepared by the impregnation method. The PW4@MIL-101(Cr) composite presents high catalytic efficiency for oxidative desulfurization of a multicomponent model diesel containing the most refractory sulfur compounds present in real fuels (2000 ppm of total S). The catalytic performance of this heterogeneous catalyst is similar to the corresponding homogeneous PW4 active center. Desulfurization efficiency of 99.7% was achieved after only 40 min at 70 °C using H2O2 as an oxidant and an ionic liquid as an extraction solvent ([BMIM]PF6, 2:1 model diesel/[BMIM]PF6). High recycling and reusing capacity was also found for PW4@MIL-101(Cr), maintaining its activity for consecutive oxidative desulfurization cycles. A comparison of the catalytic performance of this peroxotungstate composite with others previously reported tungstate@MIL-101(Cr) catalysts indicates that the presence of active oxygen atoms from the peroxo groups promotes a higher oxidative catalytic efficiency in a shorter reaction time.

Polymolybdate Supported Nano Catalyst for Desulfurization of Diesel

2016 ◽  
pp. 263-280
Author(s):  
Wan Azelee Wan Abu Bakar ◽  
Wan Nazwanie Wan Abdullah ◽  
Rusmidah Ali ◽  
Wan Nur Aini Wan Mokhtar
Keyword(s):  
Calcination Temperature ◽  
Mild Condition ◽  
Sulfur Removal ◽  
Oxidative Desulfurization ◽  
Catalyst Loading ◽  
Impregnation Method ◽  
Tert Butyl Hydroperoxide ◽  
Nano Catalyst ◽  
Catalytic Oxidative Desulfurization ◽  
Wet Impregnation Method

The Catalytic oxidative desulfurization (Cat-ODS) comprises of molybdenum based catalyst, tert-butyl hydroperoxide (TBHP) as oxidant and dimethylformamide (DMF) as solvent for extraction. A series of polymolybdates supported alumina were prepared using the wet impregnation method. This potential catalyst was characterized by FTIR, FESEM-EDX and XPS for its physical properties. From catalytic testing, Fe/MoO3-Al2O3 calcined at 500°C was revealed as the most potential catalyst which gave the highest sulfur removal under mild condition .The sulfur content in commercial diesel was successfully reduced from 440 ppmw to 88 ppmw under mild condition followed by solvent extraction. Response surface methodology involving Box-Behnken was employed to evaluate and optimize Fe/MoO3/Al2O3 preparation parameters (calcination temperature, catalyst loading, and Fe loading) and their optimum values were found to be 550 ºC, 10 g/L, and 10%. of calcination temperature, catalyst loading, and Fe loading. Based on these results, the reaction mechanisms of peroxy oxygen were proposed.

Efficient Oxidative Desulfurization (ODS) of Commercial Diesel with TBHP under Mild Conditions Catalyzed by Polymolybdates Supported on Al2O3

2015 ◽  
Vol 1107 ◽  
pp. 341-346
Author(s):  
Wan Nazwanie Wan Abdullah ◽  
Rusmidah Ali ◽  
Wan Azelee Wan Abu Bakar
Keyword(s):  
Sulfur Content ◽  
Research Work ◽  
Sulfur Removal ◽  
Oxidative Desulfurization ◽  
Catalyst System ◽  
Impregnation Method ◽  
Butyl Hydroperoxide ◽  
Tert Butyl ◽  
Alternative Method ◽  
Tert Butyl Hydroperoxide

Due to the low specifications for sulfur content in diesel, a lot of research work are been conducted to develop alternative method for desulfurization. Catalytic oxidative desulfurization (Cat-ODS) has been found to be an alternative method to replace a conventional method which is hydrodesulfurization.New catalyst formulation using tert-butyl hydroperoxide polymolybdate based catalyst system was investigated in this research utilizing tert-butyl hydroperoxide (TBHP) as oxidant and dimethylformamide (DMF) as solvent for extraction. A series of polymolybdate supported alumina catalysts were prepared using wet impregnation method, ageing at ambient room temperature for 24 hours and followed by calcination process. A commercial diesel with 440 ppmw of total sulfur was employed to evaluate the elimination of sulfur compounds. Besides, the percentage of sulfur removal was measured by gas chromatography-flame photometric detector (GC-FPD). The sulfur content in commercial diesel was successfully reduced from 440 ppmw to 35 ppmw under mild condition followed by solvent extraction. From catalytic testing, Mo-Al2O3 calcined at 500°C was revealed as the most potential catalyst which gave 92% of sulfur removal.

scholarly journals Membrane-Supported Layered Coordination Polymer as an Advanced Sustainable Catalyst for Desulfurization

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2404
Author(s):  
Fátima Mirante ◽  
Ricardo F. Mendes ◽  
Rui G. Faria ◽  
Luís Cunha-Silva ◽  
Filipe A. Almeida Paz ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Oxidative Desulfurization ◽  
Liquid System ◽  
Catalytic Membrane ◽  
Extraction Solvent ◽  
Acrylic Glass ◽  
Drying Procedures ◽  
Cost Efficient ◽  
Model Diesel ◽  
Reaction Cycles

The application of a catalytic membrane in the oxidative desulfurization of a multicomponent model diesel formed by most refractory sulfur compounds present in fuel is reported here for the first time. The catalytic membrane was prepared by the impregnation of the active lamellar [Gd(H4nmp)(H2O)2]Cl·2H2O (UAV-59) coordination polymer (CP) into a polymethyl methacrylate (PMMA, acrylic glass) supporting membrane. The use of the catalytic membrane in the liquid–liquid system instead of a powder catalyst arises as an enormous advantage associated with the facility of catalyst handling while avoiding catalyst mass loss. The optimization of various parameters allowed to achieve a near complete desulfurization after 3 h under sustainable conditions, i.e., using an aqueous H2O2 as oxidant and an ionic liquid as extraction solvent ([BMIM]PF6, 1:0.5 ratio diesel:[BMIM]PF6). The performance of the catalytic membrane and of the powdered UAV-59 catalyst was comparable, with the advantage that the former could be recycled successfully for a higher number of desulfurization cycles without the need of washing and drying procedures between reaction cycles, turning the catalytic membrane process more cost-efficient and suitable for future industrial application.

Effect of Preparation Method on Ag Modified Ti-HMS Catalyst Structure and Catalytic Oxidative Desulfurization Performance

2017 ◽  
Vol 16 (3) ◽  
Author(s):  
Fang Wang ◽  
Guangjian Wang ◽  
Liancheng Bing ◽  
Yong Wang ◽  
Aixiu Tian ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Molecular Sieves ◽  
Oxidative Desulfurization ◽  
Mesoporous Structure ◽  
Catalytic Performance ◽  
Mesoporous Molecular Sieves ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Extraction Solvent ◽  
Catalytic Oxidative Desulfurization

AbstractAg modified mesoporous molecular sieves Ti-HMS were prepared by in-situ synthesis (Ag/Ti-HMS-I), deposition-precipitation method (Ag/Ti-HMS-D) and ultrasound-assisted impregnation methods (Ag/Ti-HMS-U), respectively. The catalytic performance of catalysts in the oxidative desulfurization(ODS) of benzothiophene with hydrogen peroxide (H2O2) has been investigated. The physicochemical properties of the catalysts were characterized by XRD, SEM, BET and FT-IR techniques. Experimental results showed that the catalyst Ag/Ti-HMS-U exhibited the best catalytic activity, and this maybe because the catalyst possessed relatively good mesoporous structure and high Ag dispersion. Under the best operating condition for the catalytic oxidative desulfurization: temperature 60 °C, atmospheric pressure, 0.1 g catalysts, 8 molar ratio of hydrogen peroxide to sulfur, using acetonitrile as extraction solvent for double extraction, the sulfur content in model diesel fuel (MDF) was reduced from 800 ppm to 17 ppm with 97.8% of total sulfur after 1 h.

scholarly journals Understanding Pore Surface Modification of Sucrose-Modified Iron Oxide/Silica Mesoporous Composite for Degradation of Methylene Blue

2021 ◽  
Vol 16 (3) ◽  
pp. 459-471
Author(s):  
Yuvita Eka Pertiwi ◽  
Maria Ulfa ◽  
Teguh Endah Saraswati ◽  
Didik Prasetyoko ◽  
Wega Trisunaryanti
Keyword(s):  
Methylene Blue ◽  
Iron Oxide ◽  
Surface Area ◽  
Heterogeneous Reaction ◽  
High Surface ◽  
High Surface Area ◽  
Impregnation Method ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Wide Range

Santa Barbara Amorphous (SBA-15) containing iron oxide with a sucrose-modified in a heterogeneous reaction for degradation methylene blue (MB) successful synthesized used hydrothermal, ultrasonication, and wet impregnation method. SBA-15 is mesoporous silica that can easily serve as external and internal surfaces making it suitable for a wide range of applications. The structure and morphology of materials were characterized using Surface Area Analyzer (SAA), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX), and Transmission Electron Microscopy (TEM). Iron oxide impregnated as a maghemite phase has an average size of 12 nm and well distributed on the SBA-15. After modified with sucrose the materials remaining stable, which has a two-dimensional hexagonal (p6mm) structure, high specific surface area, and large pore volume (up to 1.82 cm3.g−1). The degradation of MB was evaluated under visible light irradiation using UV-Vis spectroscopy. Catalytic activity showed efficiencies of 52.9; 70.2; and 21.1% for SBA-15, Fe2O3/SBA-15, and sucrose-modified Fe2O3/SBA-15 respectively. Sucrose-modified Fe2O3/SBA-15 has the lowest efficiency, which probably occurs due to the presence of pore-blocking and the formation of micropores on the external pore. The modification with sucrose has the advantage of producing a high surface area even though there is a catalytic center due to partial decomposition which causes a decrease in the efficiency of degradation of MB. All materials provide a high micro surface area so that they can be further adapted and can be widely applied to many potential applications as both catalyst support and an adsorbent. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

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