Highly selective catalytic conversion of phenols to aromatic hydrocarbons on CoS2/MoS2 synthesized using a two step hydrothermal method

RSC Advances ◽  
2016 ◽  
Vol 6 (37) ◽  
pp. 31265-31271 ◽  
Author(s):  
Weiyan Wang ◽  
Lu Li ◽  
Kui Wu ◽  
Guohua Zhu ◽  
Song Tan ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Aromatic Hydrocarbons ◽  
Catalytic Conversion ◽  
Composite Catalysts ◽  
Very High

CoS2/MoS2 composite catalysts were synthesized by two-step hydrothermal method and presented very high hydrodeoxygenation and direct deoxygenation activity in phenols conversion.

Influence of lattice oxygen on properties of Ce–Fe composite in NO+CO reduction system

2020 ◽  
Vol 10 (8) ◽  
pp. 1292-1299
Author(s):  
Yuze Bai ◽  
Huizhong Wu ◽  
Jinhao Zhu ◽  
Lichao Yang ◽  
Na Li ◽  
...  
Keyword(s):  
Solid Solution ◽  
Hydrothermal Method ◽  
Fine Particles ◽  
Lattice Oxygen ◽  
Composite Catalyst ◽  
Ferric Nitrate ◽  
High Catalytic Activity ◽  
Composite Catalysts ◽  
Reduction System ◽  
Co Reduction

Ce–Fe composite was prepared by hydrothermal method to simulate the ore facies with Ce–Fe coatingembedded structure in rare earth tailings. Fe2O3 is used as the carrier and cerium nitrate is used as active component. We studied the effect of lattice oxygen on the performance of Ce–Fe composites in the NO+CO reduction system. The results show that the peak of CeO2 in the sample prepared by the hydrothermal method of nitric acid moves at a high angle, the lattice constant becomes smaller, and the diffraction peak corresponding to CeO2 in Raman is red-shifted. It indicated that the hydrothermal method can form Ce–O–Fe solid solution. In TEM, nanoscale Fe2O3 particles caused by the decomposition of ferric nitrate were observed on the surface of the sample. In the whole reaction process, a large amount of lattice oxygen provided by Fe2O3 as a carrier, the presence of Ce–O–Fe solid solution and free Fe2O3 fine particles determine the high catalytic activity of the composite catalyst. The presence of CeO2 can improve the surface reduction of Fe2O3, and also promote the conversion of Fe3+ to Fe2+, Ce4+ to Ce3+. The conversion of lattice oxygen to adsorbed oxygen reflects the combined action of the composite catalysts Ce and Fe. The denitration rate of the Ce–Fe composite NO+CO reduction system exceeded 92.24% at 700 °C. Lattice oxygen can promote the performance of Ce–Fe composites in NO+CO reduction system.

scholarly journals Catalytic conversion of rubber wastes to produce aromatic hydrocarbons over USY zeolites: Effect of SiO2/Al2O3 mole ratio

2019 ◽  
Vol 197 ◽  
pp. 111857 ◽  
Author(s):  
Jia Wang ◽  
Jianchun Jiang ◽  
Xiaobo Wang ◽  
Peng Liu ◽  
Jing Li ◽  
...  
Keyword(s):  
Aromatic Hydrocarbons ◽  
Catalytic Conversion

Catalytic Conversion of Methane into Aromatic Hydrocarbons over Iron Oxide Loaded ZSM-5 Zeolites

1997 ◽  
Vol 36 (21) ◽  
pp. 2374-2376 ◽  
Author(s):  
Bert M. Weckhuysen ◽  
Dingjun Wang ◽  
Michael P. Rosynek ◽  
Jack H. Lunsford
Keyword(s):  
Iron Oxide ◽  
Aromatic Hydrocarbons ◽  
Catalytic Conversion ◽  
Conversion Of Methane

High capacity VO2(B) nanostrips synthesized by microwave-hydrothermal method

2019 ◽  
Vol 12 (02) ◽  
pp. 1950004 ◽  
Author(s):  
Zi Yang ◽  
Yongchuan Liu ◽  
Feng Li ◽  
Qingya Yin ◽  
Youxin Lou ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Coulombic Efficiency ◽  
High Capacity ◽  
Microwave Hydrothermal ◽  
Initial Discharge ◽  
Microwave Hydrothermal Method ◽  
Alignment Structure ◽  
Xrd Patterns ◽  
Discharge Capacities ◽  
Very High

VO2(B) nanostrips were synthesized by microwave-hydrothermal method. The XRD patterns show that VO2(B) nanostrips are pure metastable monoclinic phase. VO2(B) nanostrips, in length of 1.5–2[Formula: see text][Formula: see text]m, width of 200–400[Formula: see text]nm, and thickness of 10–20[Formula: see text]nm, present exposed (001) facets and parallel alignment structure. The VO2(B) nanostrips are composed of nanosheets with 2–5[Formula: see text]nm thickness. A very high initial discharge capacity of 318.3[Formula: see text]mAh[Formula: see text]g[Formula: see text] is obtained and the capacity of 100th cycle is 248.5[Formula: see text]mAh[Formula: see text]g[Formula: see text] (about 78.0% retention) at 50[Formula: see text]mA[Formula: see text]g[Formula: see text]. The capacity fades at about 4.08% per cycle for the first 10 cycles. After 10 cycles, the fading slows down to 0.32% per cycle. The rate performance shows the first discharge capacities of VO2(B) nanostrips are 249.6, 212.0, 181.8, 161.7, and 145.2[Formula: see text]mAh[Formula: see text]g[Formula: see text] at 0.1, 0.2, 0.4, 0.8, and 1.6[Formula: see text]A[Formula: see text]g[Formula: see text], respectively, with around 100% coulombic efficiency. Glycerol and microwave-hydrothermal method contribute to the shaping and thickness of VO2(B) nanostrips with the parallel alignment nanostructure, which directly improves the electrical properties of this material.

Laboratory astrochemistry: catalytic conversion of acetylene to polycyclic aromatic hydrocarbons over SiC grains

2016 ◽  
Vol 18 (5) ◽  
pp. 3489-3496 ◽  
Author(s):  
T. Q. Zhao ◽  
Q. Li ◽  
B. S. Liu ◽  
R. K. E. Gover ◽  
P. J. Sarre ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Catalytic Conversion ◽  
Chemical Processes ◽  
Polycyclic Aromatic ◽  
Grain Surface

Catalytic conversion reactions of acetylene on a solid SiC grain surface lead to the formation of polycyclic aromatic hydrocarbons (PAHs) and are expected to mimic chemical processes in certain astrophysical environments.

Biodegradation of aliphatic and aromatic hydrocarbons at high temperatures

2003 ◽  
Vol 47 (10) ◽  
pp. 123-130 ◽  
Author(s):  
H. Feitkenhauer ◽  
H. Märkl
Keyword(s):  
High Temperature ◽  
Kinetic Parameters ◽  
Mixed Culture ◽  
High Temperatures ◽  
Aromatic Hydrocarbons ◽  
Chemical System ◽  
Separate Experiment ◽  
Phenol Biodegradation ◽  
Aliphatic And Aromatic Hydrocarbons ◽  
Very High

In this paper, the high temperature (65-75°C) biodegradation of aliphatic and aromatic hydrocarbons is investigated and kinetic parameters are derived. The shift of the physico-chemical system properties with rising temperature will be discussed in detail. For example, the solubility of naphthalene is increased by a factor of about ten if the temperature is increased from 20 to 75°C. This effect is essential to increase the bioavailability of sparingly soluble hydrocarbons. It is also demonstrated in experiments that very high oxygen transfer rates can be obtained at high temperatures in the presence of hydrocarbons. It is shown that efficient phenol biodegradation is essential for high temperature hydrocarbon degradation because some microorganisms tend to transform phenols into polyphenols which are very inhibitory for microbial growth. A defined mixed culture adapted to phenol converted more than 90% of a mixture of phenol, hexadecane and pyrene and a very high maximal growth rate of 0.19 h−1 was determined. A yield coefficient YX/S of about 0.8 g (biomass)/g (hydrocarbons) was calculated in this experiment. In a separate experiment the influence of the hydrocarbon droplet size on the biodegradation is investigated at 70°C using a newly isolated Thermus sp. In this case, the growth on a hexadecane/pyrene mixture was described by a model based on the Monod equation and the corresponding kinetic parameters are derived. A mixed culture was used for the bioremediation of soil in a slurry reactor. The initial contamination of 11 g/kg was lowered to about 2 g in a reactor inoculated by an immobilized culture of extreme thermophilic microorganisms, while 9 g/kg remained in a sterile control.

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