TY - GEN
T1 - Improving the carbon resistance of reforming Ni catalysts by alloying with Rh
AU - Guo, Jiahua
AU - Xie, Chao
AU - Lee, Kyungtae
AU - Song, Chunshan
AU - Janik, Michael J.
PY - 2009
Y1 - 2009
N2 - The most widely used industrial method for H2 production is hydrocarbon steam reforming over Ni-based catalysts. However, under the low O:C ratios optimal for overall efficiency, Ni catalysts deactivate due to carbon deposition. Carbon deposition occurs via either hydrocarbon decomposition (CnH2n+2 → nC + (n+1)H2) or CO disproportionation (2CO → CO2 + C) reactions. The addition of the second metal to the Ni surface can increase carbon tolerance by introducing variations of carbon chemistry over the catalyst surface. In the present study, supported Ni and Rh/Ni catalysts were synthesized and tested for hydrocarbon steam reforming. Carbon analysis on the spent catalysts illustrates that the carbon deposition is significantly reduced in the presence of Rh. In order to provide insights into the mechanistic changes introduced by Rh, carbon diffusion and oxidation processes over Ni and Rh/Ni alloy surfaces were simulated by DFT calculations.
AB - The most widely used industrial method for H2 production is hydrocarbon steam reforming over Ni-based catalysts. However, under the low O:C ratios optimal for overall efficiency, Ni catalysts deactivate due to carbon deposition. Carbon deposition occurs via either hydrocarbon decomposition (CnH2n+2 → nC + (n+1)H2) or CO disproportionation (2CO → CO2 + C) reactions. The addition of the second metal to the Ni surface can increase carbon tolerance by introducing variations of carbon chemistry over the catalyst surface. In the present study, supported Ni and Rh/Ni catalysts were synthesized and tested for hydrocarbon steam reforming. Carbon analysis on the spent catalysts illustrates that the carbon deposition is significantly reduced in the presence of Rh. In order to provide insights into the mechanistic changes introduced by Rh, carbon diffusion and oxidation processes over Ni and Rh/Ni alloy surfaces were simulated by DFT calculations.
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M3 - Conference contribution
AN - SCOPUS:78649774239
SN - 9780841200050
T3 - ACS National Meeting Book of Abstracts
BT - American Chemical Society - 238th National Meeting and Exposition, ACS 2009, Abstracts of Scientific Papers
T2 - 238th National Meeting and Exposition of the American Chemical Society, ACS 2009
Y2 - 16 August 2009 through 20 August 2009
ER -