scholarly journals Catalytic carbon deposition-oxidation over Ni, Fe and Co catalysts: A new indirect route to store and transport gas hydrocarbon fuels

2013 ◽  
Vol 32 ◽  
pp. 58-61 ◽  
Author(s):  
Patrícia E.F. Oliveira ◽  
Leandro P. Ribeiro ◽  
Marcelo G. Rosmaninho ◽  
José D. Ardisson ◽  
Anderson Dias ◽  
...  
Keyword(s):  
Carbon Deposition ◽  
Hydrocarbon Fuels ◽  
Co Catalysts ◽  
Indirect Route

Stability of Nickel-based Cermet Anode for Carbon Deposition during Cell Operation with Slightly Humidified Gaseous Hydrocarbon Fuels

2019 ◽  
Vol 7 (1) ◽  
pp. 1661-1668 ◽  
Author(s):  
Katsuhiko Yamaji ◽  
Haruo Kishimoto ◽  
Xiong Yueping ◽  
Teruhisa Horita ◽  
Natsuko Sakai ◽  
...  
Keyword(s):  
Carbon Deposition ◽  
Hydrocarbon Fuels ◽  
Gaseous Hydrocarbon

Deposit Formation in Hydrocarbon Fuels

1983 ◽  
Vol 105 (1) ◽  
pp. 59-65 ◽  
Author(s):  
R. Roback ◽  
E. J. Szetela ◽  
L. J. Spadaccini
Keyword(s):  
Thermal Stability ◽  
Carbon Deposition ◽  
Tube Wall ◽  
Hydrocarbon Fuels ◽  
Wall Material ◽  
Test Apparatus ◽  
Deposit Formation ◽  
Deposition Rates ◽  
Commercial Grade ◽  
Inside Wall

A high-pressure fuel coking test apparatus was designed and developed and was used to evaluate thermal decomposition (coking) limits and carbon deposition rates in heated copper tubes for two hydrocarbon fuels, RP-1 and commercial-grade propane. Tests were also conducted using JP-7 and chemically-pure propane as being representative of more refined cuts of the baseline fuels. A parametric evaluation of fuel thermal stability was performed at pressures of 136 atm to 340 atm, bulk fuel velocities in the range 6–30 m/s and tube wall temperatures in the range 422–811 K. In addition, the effect of the inside wall material on deposit formation was evaluated in selected tests which were conducted using nickel-plated tubes. The results of the tests indicated that substantial deposit formation occurs with RP-1 fuel at wall temperatures between 600 and 800 K, with peak deposit formation occurring near 700 K. No improvements were obtained when deoxygenated JP-7 fuel was substituted for RP-1. The carbon deposition rates for the propane fuels were generally higher than those obtained for either of the kerosene fuels at any given wall temperature. Finally, plating the inside wall of the tubes with nickel was found to significantly reduce carbon deposition rates for RP-1 fuel.

Carbon deposition on Co catalysts during Fischer–Tropsch synthesis: A computational and experimental study

2010 ◽  
Vol 274 (2) ◽  
pp. 121-129 ◽  
Author(s):  
Kong Fei Tan ◽  
Jing Xu ◽  
Jie Chang ◽  
Armando Borgna ◽  
Mark Saeys
Keyword(s):  
Experimental Study ◽  
Carbon Deposition ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Co Catalysts

CO activation and methanation mechanism on hexagonal close-packed Co catalysts: effect of functionals, carbon deposition and surface structure

2020 ◽  
Vol 10 (10) ◽  
pp. 3387-3398
Author(s):  
Hai-Yan Su ◽  
Changlin Yu ◽  
Jin-Xun Liu ◽  
Yonghui Zhao ◽  
Xiufang Ma ◽  
...  
Keyword(s):  
Surface Structure ◽  
Carbon Deposition ◽  
Graphitic Carbon ◽  
Co Methanation ◽  
Co Catalysts ◽  
Hexagonal Close Packed ◽  
Co Activation

Regardless of the functionals used and the presence of graphitic carbon, the CO methanation rate on Co(0001) is mainly controlled by CHO decomposition.

Deposit Formation in Hydrocarbon Fuels

1982 ◽  
Author(s):  
R. Roback ◽  
E. J. Szetela ◽  
L. J. Spadaccini
Keyword(s):  
Thermal Stability ◽  
Carbon Deposition ◽  
Tube Wall ◽  
Hydrocarbon Fuels ◽  
Wall Material ◽  
Test Apparatus ◽  
Deposit Formation ◽  
Deposition Rates ◽  
Commercial Grade ◽  
Inside Wall

A high pressure fuel coking test apparatus was designed and developed and was used to evaluate thermal decomposition (coking) limits and carbon deposition rates in heated copper tubes for two hydrocarbon fuels, RP-1 and commercial-grade propane. Tests were also conducted using JP-7 and chemically-pure propane as being representative of more refined cuts of the baseline fuels. A parametric evaluation of fuel thermal stability was performed at pressures of 136 atm to 340 atm, bulk fuel velocities in the range 6–30 m/s and tube wall temperatures in the range 422–811 K. In addition, the effect of the inside wall material on deposit formation was evaluated in selected tests which were conducted using nickel-plated tubes. The results of the tests indicated that substantial deposit formation occurs with RP-1 fuel at wall temperatures between 600 and 800 K, with peak deposit formation occurring near 700 K. No improvements were obtained when deoxygenated JP-7 fuel was substituted for RP-1. The carbon deposition rates for the propane fuels were generally higher than those obtained for either of the kerosene fuels at any given wall temperature. Finally, plating the inside wall of the tubes with nickel was found to significantly reduce carbon deposition rates for RP-1 fuel.

Microstructural and fractographic characterization of B4C-Al cermets tested under dynamic and static loading

1989 ◽  
Vol 47 ◽  
pp. 562-563
Author(s):  
Gyeung Ho Kim ◽  
Mehmet Sarikaya ◽  
D. L. Milius ◽  
I. A. Aksay
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Fracture Toughness ◽  
Static Loading ◽  
Carbon Deposition ◽  
Full Density ◽  
Unique Combination ◽  
Strong Component ◽  
Reaction Products

Cermets are designed to optimize the mechanical properties of ceramics (hard and strong component) and metals (ductile and tough component) into one system. However, the processing of such systems is a problem in obtaining fully dense composite without deleterious reaction products. In the lightweight (2.65 g/cc) B4C-Al cermet, many of the processing problems have been circumvented. It is now possible to process fully dense B4C-Al cermet with tailored microstructures and achieve unique combination of mechanical properties (fracture strength of over 600 MPa and fracture toughness of 12 MPa-m1/2). In this paper, microstructure and fractography of B4C-Al cermets, tested under dynamic and static loading conditions, are described.The cermet is prepared by infiltration of Al at 1150°C into partially sintered B4C compact under vacuum to full density. Fracture surface replicas were prepared by using cellulose acetate and thin-film carbon deposition. Samples were observed with a Philips 3000 at 100 kV.

Bimetallic Radical Redox-Relay Catalysis for the Isomerization of Epoxides to Allylic Alcohols

2019 ◽  
Author(s):  
Ke-Yin Ye ◽  
Terry McCallum ◽  
Song Lin
Keyword(s):  
Ring Opening ◽  
High Reactivity ◽  
Hydrogen Atom Transfer ◽  
Organic Radicals ◽  
Epoxide Ring ◽  
Allylic Alcohols ◽  
Epoxide Ring Opening ◽  
Bond Forming ◽  
Co Catalysts ◽  
The Rich

Organic radicals are generally short-lived intermediates with exceptionally high reactivity. Strategically, achieving synthetically useful transformations mediated by organic radicals requires both efficient initiation and selective termination events. Here, we report a new catalytic strategy, namely bimetallic radical redox-relay, in the regio- and stereoselective rearrangement of epoxides to allylic alcohols. This approach exploits the rich redox chemistry of Ti and Co complexes and merges reductive epoxide ring opening (initiation) with hydrogen atom transfer (termination). Critically, upon effecting key bond-forming and -breaking events, Ti and Co catalysts undergo proton-transfer/electron-transfer with one another to achieve turnover, thus constituting a truly synergistic dual catalytic system.<br>

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