scholarly journals Insight into the oxidative desulfurization of high-sulfur petroleum coke under mild conditions: a journey of vanadium-substituted Dawson-type phosphotungstic acid

2021 ◽  
Author(s):  
Fu-Min Li ◽  
Ming-Qing Hua ◽  
Yan-Chen Wei ◽  
Ji-Xing Liu ◽  
Jia-Hong Gong ◽  
...  
Keyword(s):  
Petroleum Coke ◽  
Atmospheric Pressure ◽  
Reaction Kinetic ◽  
Oxidative Desulfurization ◽  
Organic Sulfur ◽  
Reaction Conditions ◽  
Practical Applications ◽  
Mild Conditions ◽  
Catalytic Oxidative Desulfurization ◽  
Insight Into

AbstractHigh-sulfur petroleum coke (HSPC), that is a by-product from slag oil in the coking process of refining, shows versatility values in practical applications and, however, concentrates the majority of organic sulfur. Herein, we design and construct a highly effective CTAB@HPA composites to be explored for the catalytic oxidative desulfurization of HSPC under mild conditions using hydrogen peroxide as the oxidant and 1-butyl-3-methylimidazole tetrafluoroborate ionic liquid as the extractant. The results demonstrate that the sulfur content of HSPC could be strikingly reduced from 4.46 wt% to 2.48 wt% under 60 °C and atmospheric pressure, and that the organic sulfur in HSPC is mainly oxidized to sulfoxide, sulfone and sulfate, which latter can be directly separated from petroleum coke. Moreover, the effect of reaction conditions on the desulfurization performance of HSPC as well as the catalytic oxidation reaction kinetic of HSPC desulfurization was systematically investigated. Furthermore, a mechanism for the oxidative desulfurization of HSPC over CTAB@HPA catalysts was proposed. Therefore, this work provides new insight into how to construct active catalysts for the desulfurization of HSPC under mild conditions.

Desulfurization from Gasoline by Polymer Resin at Room Temperature and Atmospheric Pressure

2011 ◽  
Vol 396-398 ◽  
pp. 1283-1286
Author(s):  
Jian Peng Zhu ◽  
Chun Hu Li ◽  
Jia Ling Chen ◽  
Ying Wei Luo
Keyword(s):  
Reaction Time ◽  
Sulfur Content ◽  
Atmospheric Pressure ◽  
Room Temperature ◽  
Oxidative Desulfurization ◽  
Sulfur Compounds ◽  
Molar Ratio ◽  
Reaction Conditions ◽  
Polymer Resin ◽  
Mild Conditions

Abstract. Investigation of polymer resin as catalyst in the oxidative desulfurization (ODS) process has revealed that the method can be applied to make a relative high removal of sulfur compounds. The reaction conditions, including temperature, amount of oxidant and reaction time were studied. The best result occurs under mild conditions with respect to room temperature and atmospheric pressure, to remove 75.54% of the totle sulfur content in the presence of H2O2 with an O/S molar ratio of 17. Possible mechanism is also disscussed.

scholarly journals Rational synthesis of an atomically precise carboncone under mild conditions

2019 ◽  
Vol 5 (8) ◽  
pp. eaaw0982 ◽  
Author(s):  
Zheng-Zhong Zhu ◽  
Zuo-Chang Chen ◽  
Yang-Rong Yao ◽  
Cun-Hao Cui ◽  
Shu-Hui Li ◽  
...  
Keyword(s):  
Apex Angle ◽  
Facile Synthesis ◽  
Reaction Conditions ◽  
X Ray ◽  
Carbon Allotropes ◽  
X Ray Crystallography ◽  
Mild Conditions ◽  
Research Opportunity ◽  
Insight Into ◽  
Structural Strain

Carboncones, a special family of all-carbon allotropes, are predicted to have unique properties that distinguish them from fullerenes, carbon nanotubes, and graphenes. Owing to the absence of methods to synthesize atomically well-defined carboncones, however, experimental insight into the nature of pure carboncones has been inaccessible. Herein, we describe a facile synthesis of an atomically well-defined carboncone[1,2] (C70H20) and its soluble penta-mesityl derivative. Identified by x-ray crystallography, the carbon skeleton is a carboncone with the largest possible apex angle. Much of the structural strain is overcome in the final step of converting the bowl-shaped precursor into the rigid carboncone under mild reaction conditions. This work provides a research opportunity for investigations of atomically precise single-layered carboncones having even higher cone walls and/or smaller apex angles.

scholarly journals Hydrolysis of wheat straw hemicelluloses for maximum xylose extraction

2021 ◽  
Vol 939 (1) ◽  
pp. 012006
Author(s):  
Zh Makhatov ◽  
Zh Yelemanova ◽  
R Aitkulova ◽  
Z Narymbayeva ◽  
A Dairabayeva ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Atmospheric Pressure ◽  
Reaction Conditions ◽  
Glucose Yield ◽  
Process Duration ◽  
Mild Conditions ◽  
Dilute Sulfuric Acid ◽  
Hydrolysis Process ◽  
Initial Content ◽  
Hydrolysis Of

Abstract The aim of the study is to select reaction conditions for hydrolysis of wheat straw with dilute sulfuric acid for maximum xylose extraction under mild conditions (at atmospheric pressure and temperature of 100°C). The authors found that maximum glucose yield (72.4-77.1 weight % of the initial content of hemicelluloses in wheat straw) is achieved at a concentration of H2SO4 2-3 weight % and the hydrolysis process duration of 5 hours. Analysis of the obtained hydrolysates showed that they contain cellulose (56.8-70.4 weight %), lignin (19.8-28.8 weight %) and hemicelluloses (2.8-15.3 weight %).

Deep catalytic oxidative desulfurization (ODS) of dibenzothiophene (DBT) with oxalate-based deep eutectic solvents (DESs)

2015 ◽  
Vol 51 (53) ◽  
pp. 10703-10706 ◽  
Author(s):  
Hongying Lü ◽  
Pengcheng Li ◽  
Changliang Deng ◽  
Wanzhong Ren ◽  
Shunan Wang ◽  
...  
Keyword(s):  
High Activity ◽  
Ammonium Chloride ◽  
Oxidative Desulfurization ◽  
Deep Eutectic Solvents ◽  
Molar Ratio ◽  
Reaction Conditions ◽  
Tetrabutyl Ammonium ◽  
Catalytic Oxidative Desulfurization

An oxalate-based DES with a tetrabutyl ammonium chloride and oxalate acid molar ratio of 1/2 (TBO1 : 2) exhibited high activity in oxidative desulfurization (ODS) of dibenzothiophene (DBT) under mild reaction conditions.

Phosphotungstic acid encapsulated in the mesocages of amine-functionalized metal–organic frameworks for catalytic oxidative desulfurization

2014 ◽  
Vol 43 (31) ◽  
pp. 11950-11958 ◽  
Author(s):  
Xu-Sheng Wang ◽  
Yuan-Biao Huang ◽  
Zu-Jin Lin ◽  
Rong Cao
Keyword(s):  
Catalytic Activity ◽  
Phosphotungstic Acid ◽  
Metal Organic Frameworks ◽  
Oxidative Desulfurization ◽  
High Catalytic Activity ◽  
Exchange Method ◽  
Mild Conditions ◽  
Amine Functionalized ◽  
Catalytic Oxidative Desulfurization ◽  
Metal Organic

PTA@MIL-101(Cr)-NH2 has been prepared via an anion exchange method, and showed high catalytic activity for oxidative desulfurization under mild conditions.

Imidazole-based Cu(i)-catalyzed click polymerization of diazides and diynes under mild conditions

2021 ◽  
Author(s):  
Baixue Li ◽  
Jia Wang ◽  
Anjun Qin ◽  
Ben Zhong Tang
Keyword(s):  
Reaction Conditions ◽  
Mild Conditions ◽  
Click Polymerization

An efficient imidazole-based Cu(i)-catalyzed azide–alkyne click polymerization under mild reaction conditions was developed.

In situ loading of well-dispersed silver nanoparticles on nanocrystalline magnesium oxide for real-time monitoring of catalytic reactions by surface enhanced Raman spectroscopy

Nanoscale ◽  
2015 ◽  
Vol 7 (40) ◽  
pp. 16952-16959 ◽  
Author(s):  
Kaige Zhang ◽  
Gongke Li ◽  
Yuling Hu
Keyword(s):  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Catalytic Reactions ◽  
Reaction Intermediates ◽  
Reaction Conditions ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Nanocrystalline Magnesium Oxide ◽  
Insight Into

The surface-enhanced Raman spectroscopy (SERS) technique is of great importance for insight into the transient reaction intermediates and mechanistic pathways involved in heterogeneously catalyzed chemical reactions under actual reaction conditions, especially in water.

scholarly journals Design of bifunctional quaternary phosphonium salt catalysts for CO2 fixation reaction with epoxides under mild conditions

2016 ◽  
Vol 18 (17) ◽  
pp. 4611-4615 ◽  
Author(s):  
Shiyao Liu ◽  
Naoki Suematsu ◽  
Keiji Maruoka ◽  
Seiji Shirakawa
Keyword(s):  
Co2 Fixation ◽  
Phosphonium Salt ◽  
Cyclic Carbonates ◽  
Efficient Synthesis ◽  
Reaction Conditions ◽  
Mild Conditions ◽  
Phosphonium Iodide ◽  
Fixation Reaction ◽  
Quaternary Phosphonium Salt

An efficient synthesis of cyclic carbonates from epoxides and CO2 under mild reaction conditions was achieved via the use of a designed bifunctional quaternary phosphonium iodide catalyst.

Sign in / Sign up

Export Citation Format

Share Document