The Experts below are selected from a list of 15573 Experts worldwide ranked by ideXlab platform
Inmaculada Rodríguez-ramos - One of the best experts on this subject based on the ideXlab platform.
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Transient studies of low-temperature dry reforming of methane over Ni-CaO/ZrO2-La2O3
Applied Catalysis B: Environmental, 2013Co-Authors: Belén Bachiller-baeza, M A Soria, U Rodemerck, C. Mateos-pedrero, Antonio Guerrero-ruiz, Inmaculada Rodríguez-ramosAbstract:Abstract The low temperature reforming of methane by Carbon dioxide is studied over a calcium oxide promoted Ni catalyst supported on a tetragonal zirconia stabilized by lanthana, which presents an improved stability compared to the non-promoted catalyst. Steady-state catalytic activity measurements, diffuse reflectance infrared Fourier transform spectroscopic analysis and isotopic temporal analysis of products experiments reveal the occurrence of a bifunctional mechanism on the promoted catalyst: methane is activated on the Ni particles, Carbon dioxide interacts with the calcium oxide to form Carbonates which scavenge Carbon from nickel at the Ni-O-Ca interphase, thus restoring Ni particles to the original state. This is assumed to hinder the formation of deactivating coke, which explains the improved catalytic stability of the promoted catalyst. The main route for the Carbon Deposit formation is found to be the methane cracking in spite of the low temperature reaction.
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Transient studies of low-temperature dry reforming of methane over
2013Co-Authors: Belén Bachiller-baeza, U Rodemerck, C. Mateos-pedrero, Antonio Guerrero-ruiz, Inmaculada Rodríguez-ramosAbstract:a b s t r a c t The low temperature reforming of methane by Carbon dioxide is studied over a calcium oxide promoted Ni catalyst supported on a tetragonal zirconia stabilized by lanthana, which presents an improved stability compared to the non-promoted catalyst. Steady-state catalytic activity measurements, diffuse reflectance infrared Fourier transform spectroscopic analysis and isotopic temporal analysis of products experiments reveal the occurrence of a bifunctional mechanism on the promoted catalyst: methane is activated on the Ni particles, Carbon dioxide interacts with the calcium oxide to form Carbonates which scavenge Carbon from nickel at the Ni-O-Ca interphase, thus restoring Ni particles to the original state. This is assumed to hinder the formation of deactivating coke, which explains the improved catalytic stability of the promoted catalyst. The main route for the Carbon Deposit formation is found to be the methane cracking in spite of the low temperature reaction.
Honglan Xie - One of the best experts on this subject based on the ideXlab platform.
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Investigating the microstructures of piston Carbon Deposits in a large-scale marine diesel engine using synchrotron X-ray microtomography
Fuel, 2015Co-Authors: Xusheng Zhang, Guohe Jiang, Xiucheng Sun, Biao Deng, Peng Guanyun, Xiangming Zeng, Pengfei Sun, Honglan XieAbstract:The three-dimensional structures of Carbon Deposits on piston surfaces in a large-scale two-stroke marine diesel engine have been nondestructively investigated using synchrotron X-ray microtomography. The results indicate that the piston Carbon Deposit (PCD) has a flat bottom surface where many irregular structures accumulate. Based on the microtomography, cross sections of the Carbon Deposit sample can be obtained in the direction perpendicular to the piston surface. A uniform Deposition is found on the bottom surface of piston, where many tiny pores appear, which implies that a liquid film first forms on the piston surface and subsequent nucleation boiling occurs due to the high surface temperature. A significant decrease in the PCD density is observed when the PCD thickness is below a threshold of approximately 150 mu m. However, the PCD density remains almost unchanged from 150 to 1800 mu m. This result suggests that there should be different dominant formation mechanisms at these two stages. The local morphology, especially the approximately circular structure and the smooth boundary on the PCD surface, indicates that condensation should be the major factor controlling the formation of the PCD surface. However, the internal pores and minimal swelling on the surface could result from other mechanisms. (C) 2014 Elsevier Ltd. All rights reserved.
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investigation on the microstructure and pore characteristics of Carbon Deposit on the piston top land of marine diesel engine using synchrotron x ray microtomography
Scientia Sinica Technologica, 2014Co-Authors: Xusheng Zhang, Guanyun Peng, D U Guohao, Guohe Jiang, Xiucheng Sun, Biao Deng, Honglan Xie, W U Zhijun, Tiqiao XiaoAbstract:It is of significance that massive Carbon Deposit (CD) is observed in the combustion chamber of large-scale two-stroke marine diesel engine due to high thermal load, poor fuel quality, oil degradation and combustion and high particle emission. The structure and characteristics of CD have great influence on the engine performance and emissions. In this paper, we use synchrotron X-ray microtomography of Shanghai Synchrotron Radiation Facility to visualize the three dimensional structure of CD on the piston top land. Based on the quantitative image analysis, microstructure and pore characteristics of CD are investigated. The results show the CD thickness is around 1mm, half of clearance between cylinder liner and piston. However, the surface structure shows significant friction scratches, which suggests the oil film could be destroyed by the CD. The results of crackle distribution show that intensive crackle is located on the CD surface (inner and outer surfaces), while loosen crackle is found inside the CD. This implies that the crackle formation mechanism is different on the inner and outer surfaces. The analysis of pore connectivity indicated that most of cracks are connected, and the porosity is in the range between 10.9% and 12.8% in present experiments. In addition, small hole connected by cracks and the crackle could have impact on the absorption and desorption of unburnt emissions.
U Rodemerck - One of the best experts on this subject based on the ideXlab platform.
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transient studies of low temperature dry reforming of methane over ni cao zro2 la2o3
Applied Catalysis B-environmental, 2013Co-Authors: B Bachillerbaeza, C Mateospedrero, M A Soria, A Guerreroruiz, U Rodemerck, I RodriguezramosAbstract:Abstract The low temperature reforming of methane by Carbon dioxide is studied over a calcium oxide promoted Ni catalyst supported on a tetragonal zirconia stabilized by lanthana, which presents an improved stability compared to the non-promoted catalyst. Steady-state catalytic activity measurements, diffuse reflectance infrared Fourier transform spectroscopic analysis and isotopic temporal analysis of products experiments reveal the occurrence of a bifunctional mechanism on the promoted catalyst: methane is activated on the Ni particles, Carbon dioxide interacts with the calcium oxide to form Carbonates which scavenge Carbon from nickel at the Ni-O-Ca interphase, thus restoring Ni particles to the original state. This is assumed to hinder the formation of deactivating coke, which explains the improved catalytic stability of the promoted catalyst. The main route for the Carbon Deposit formation is found to be the methane cracking in spite of the low temperature reaction.
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Transient studies of low-temperature dry reforming of methane over Ni-CaO/ZrO2-La2O3
Applied Catalysis B: Environmental, 2013Co-Authors: Belén Bachiller-baeza, M A Soria, U Rodemerck, C. Mateos-pedrero, Antonio Guerrero-ruiz, Inmaculada Rodríguez-ramosAbstract:Abstract The low temperature reforming of methane by Carbon dioxide is studied over a calcium oxide promoted Ni catalyst supported on a tetragonal zirconia stabilized by lanthana, which presents an improved stability compared to the non-promoted catalyst. Steady-state catalytic activity measurements, diffuse reflectance infrared Fourier transform spectroscopic analysis and isotopic temporal analysis of products experiments reveal the occurrence of a bifunctional mechanism on the promoted catalyst: methane is activated on the Ni particles, Carbon dioxide interacts with the calcium oxide to form Carbonates which scavenge Carbon from nickel at the Ni-O-Ca interphase, thus restoring Ni particles to the original state. This is assumed to hinder the formation of deactivating coke, which explains the improved catalytic stability of the promoted catalyst. The main route for the Carbon Deposit formation is found to be the methane cracking in spite of the low temperature reaction.
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Transient studies of low-temperature dry reforming of methane over
2013Co-Authors: Belén Bachiller-baeza, U Rodemerck, C. Mateos-pedrero, Antonio Guerrero-ruiz, Inmaculada Rodríguez-ramosAbstract:a b s t r a c t The low temperature reforming of methane by Carbon dioxide is studied over a calcium oxide promoted Ni catalyst supported on a tetragonal zirconia stabilized by lanthana, which presents an improved stability compared to the non-promoted catalyst. Steady-state catalytic activity measurements, diffuse reflectance infrared Fourier transform spectroscopic analysis and isotopic temporal analysis of products experiments reveal the occurrence of a bifunctional mechanism on the promoted catalyst: methane is activated on the Ni particles, Carbon dioxide interacts with the calcium oxide to form Carbonates which scavenge Carbon from nickel at the Ni-O-Ca interphase, thus restoring Ni particles to the original state. This is assumed to hinder the formation of deactivating coke, which explains the improved catalytic stability of the promoted catalyst. The main route for the Carbon Deposit formation is found to be the methane cracking in spite of the low temperature reaction.
I Rodriguezramos - One of the best experts on this subject based on the ideXlab platform.
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transient studies of low temperature dry reforming of methane over ni cao zro2 la2o3
Applied Catalysis B-environmental, 2013Co-Authors: B Bachillerbaeza, C Mateospedrero, M A Soria, A Guerreroruiz, U Rodemerck, I RodriguezramosAbstract:Abstract The low temperature reforming of methane by Carbon dioxide is studied over a calcium oxide promoted Ni catalyst supported on a tetragonal zirconia stabilized by lanthana, which presents an improved stability compared to the non-promoted catalyst. Steady-state catalytic activity measurements, diffuse reflectance infrared Fourier transform spectroscopic analysis and isotopic temporal analysis of products experiments reveal the occurrence of a bifunctional mechanism on the promoted catalyst: methane is activated on the Ni particles, Carbon dioxide interacts with the calcium oxide to form Carbonates which scavenge Carbon from nickel at the Ni-O-Ca interphase, thus restoring Ni particles to the original state. This is assumed to hinder the formation of deactivating coke, which explains the improved catalytic stability of the promoted catalyst. The main route for the Carbon Deposit formation is found to be the methane cracking in spite of the low temperature reaction.
M A Soria - One of the best experts on this subject based on the ideXlab platform.
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transient studies of low temperature dry reforming of methane over ni cao zro2 la2o3
Applied Catalysis B-environmental, 2013Co-Authors: B Bachillerbaeza, C Mateospedrero, M A Soria, A Guerreroruiz, U Rodemerck, I RodriguezramosAbstract:Abstract The low temperature reforming of methane by Carbon dioxide is studied over a calcium oxide promoted Ni catalyst supported on a tetragonal zirconia stabilized by lanthana, which presents an improved stability compared to the non-promoted catalyst. Steady-state catalytic activity measurements, diffuse reflectance infrared Fourier transform spectroscopic analysis and isotopic temporal analysis of products experiments reveal the occurrence of a bifunctional mechanism on the promoted catalyst: methane is activated on the Ni particles, Carbon dioxide interacts with the calcium oxide to form Carbonates which scavenge Carbon from nickel at the Ni-O-Ca interphase, thus restoring Ni particles to the original state. This is assumed to hinder the formation of deactivating coke, which explains the improved catalytic stability of the promoted catalyst. The main route for the Carbon Deposit formation is found to be the methane cracking in spite of the low temperature reaction.
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Transient studies of low-temperature dry reforming of methane over Ni-CaO/ZrO2-La2O3
Applied Catalysis B: Environmental, 2013Co-Authors: Belén Bachiller-baeza, M A Soria, U Rodemerck, C. Mateos-pedrero, Antonio Guerrero-ruiz, Inmaculada Rodríguez-ramosAbstract:Abstract The low temperature reforming of methane by Carbon dioxide is studied over a calcium oxide promoted Ni catalyst supported on a tetragonal zirconia stabilized by lanthana, which presents an improved stability compared to the non-promoted catalyst. Steady-state catalytic activity measurements, diffuse reflectance infrared Fourier transform spectroscopic analysis and isotopic temporal analysis of products experiments reveal the occurrence of a bifunctional mechanism on the promoted catalyst: methane is activated on the Ni particles, Carbon dioxide interacts with the calcium oxide to form Carbonates which scavenge Carbon from nickel at the Ni-O-Ca interphase, thus restoring Ni particles to the original state. This is assumed to hinder the formation of deactivating coke, which explains the improved catalytic stability of the promoted catalyst. The main route for the Carbon Deposit formation is found to be the methane cracking in spite of the low temperature reaction.