scholarly journals Sulfided NiMo/Clinoptilolite Catalysts for Selective Sulfur Removal from Naphtha Stream without Olefin Hydrogenation

2020 ◽  
Author(s):  
Cristina Farías Rosales ◽  
Rut Guil-López ◽  
Marisol Faraldos ◽  
Rafael Maya Yescas ◽  
Trino Armando Zepeda ◽  
...  
Keyword(s):  
Sulfur Removal ◽  
Olefin Hydrogenation

scholarly journals Removal of Impurities from Shungite Via a Combination of Physical and Chemical Treatments

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 245
Author(s):  
Toyohisa Fujita ◽  
Taichi Aoki ◽  
Josiane Ponou ◽  
Gjergj Dodbiba ◽  
Chunlin He ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Sulfur Removal ◽  
Nitrilotriacetic Acid ◽  
Microwave Treatment ◽  
Magnetic Flux Density ◽  
High Gradient Magnetic Separation ◽  
Chemical Leaching ◽  
Inorganic Acids ◽  
Mineralogical Study ◽  
Physical And Chemical

This study investigated the removal of sulfur and iron from shungite rocks through different methods after fine grinding: flotation, magnetic separation, microwave treatment, and chemical leaching. In this work, first, a mineralogical study of shungite was conducted. The carbon, silica, iron, and sulfur compositions in the as-received shungite were 45.4%, 38.3%, 4.6%, and 2.4%, respectively. In flotation, a sulfur grade of 1.4% was obtained. In the wet high-gradient magnetic separation at a magnetic flux density of 1 tesla, the iron and sulfur grades in the nonmagnetic fraction were 2.8% and 1.9%, respectively. Furthermore, the sulfur reduced to 0.2% by the 9 min microwave irradiation. In addition, chemical leaching using chelating reagents and inorganic acids was utilized to remove iron and sulfur. Nitrilotriacetic acid (NTA) could reduce the iron and sulfur grades to 2.0% and 0.9%, respectively. For leaching using reverse aqua regia, the iron and sulfur grades were reduced to 0.9% and 0.23%, respectively. For leaching using a 6N HCl with H2O2 aqueous solution, the iron and sulfur grades were reduced to 0.8% and 0.34%, respectively. Overall, chemical leaching using HCl with H2O2 was the most effective for iron and sulfur removal from shungite.

scholarly journals Photo‐Initiated Cobalt Catalyzed Radical Olefin Hydrogenation

2021 ◽  
Author(s):  
Sier Sang ◽  
Tobias Unruh ◽  
Serhiy Demeshko ◽  
Luis Domenianni ◽  
Nicolaas van Leest ◽  
...  
Keyword(s):  
Olefin Hydrogenation

ChemInform Abstract: Facile Olefin Hydrogenation with an Osmium Dihydrogen Complex.

ChemInform ◽  
1989 ◽  
Vol 20 (45) ◽  
Author(s):  
T. J. JOHNSON ◽  
J. C. HUFFMAN ◽  
K. G. CAULTON ◽  
S. A. JACKSON ◽  
O. EISENSTEIN
Keyword(s):  
Olefin Hydrogenation

Design of a Reaction Protocol for Decoupling Sulfur Removal and Thermal Aging Effects during Desulfation of Pt−BaO/Al2O3Lean NOxTrap Catalysts

2007 ◽  
Vol 46 (9) ◽  
pp. 2735-2740 ◽  
Author(s):  
Do Heui Kim ◽  
Ya-Huei Chin ◽  
George Muntean ◽  
Aleksey Yezerets ◽  
Neal Currier ◽  
...  
Keyword(s):  
Thermal Aging ◽  
Sulfur Removal ◽  
Aging Effects

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 Technology Solutions: Cutting the cost of sulfur removal

2003 ◽  
Vol 37 (17) ◽  
pp. 319A-320A ◽  
Author(s):  
Britt E. Erickson
Keyword(s):  
Sulfur Removal ◽  
The Cost

Sulfur Removal from Spent Ladle Refining Furnace Slag at High Temperature

2021 ◽  
Vol 52 (2) ◽  
pp. 590-593
Author(s):  
Liushun Wu ◽  
Kunlong Liu ◽  
Wei Xu ◽  
Jue Wang ◽  
Haichuan Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Sulfur Removal ◽  
Ladle Refining ◽  
Furnace Slag
Sign in / Sign up

Export Citation Format

Share Document