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Open AccessArticle

Enhanced Ni-Al-Based Catalysts and Influence of Aromatic Hydrocarbon for Autothermal Reforming of Diesel Surrogate Fuel

1
Department of Chemical Engineering, Kyungpook National University, Daegu 41566, Korea
2
Korea Evaluation Institute of Industrial Technology (KEIT), Daegu 41069, Korea
3
Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu 41566, Korea
4
Korea Institute of Energy Research, Daejeon 34129, Korea
5
Wonik Materials Co., Cheongju 28125, Korea
*
Authors to whom correspondence should be addressed.
Dong Geon Ju and Seong Bin Jo contributed equally to this work.
Catalysts 2019, 9(7), 573; https://doi.org/10.3390/catal9070573
Received: 23 May 2019 / Revised: 20 June 2019 / Accepted: 26 June 2019 / Published: 28 June 2019
(This article belongs to the Special Issue Catalysis for Energy Production)
Aromatic hydrocarbons along with sulfur compounds in diesel fuel pose a significant threat to catalytic performances, due mainly to carbon deposition on the catalytic surface. In order to investigate the influence of an aromatic hydrocarbon on the autothermal reforming of diesel fuel, 1-methylnaphthalene (C11H10) was selected as an aromatic hydrocarbon. Two types of diesel surrogate fuel, i.e., DH (dodecane (C12H26) and hexadecane (C16H34) mixture) as well as DHM (DH fuel and C11H10 mixture) fuel, were prepared. A Rh-Al-based catalyst (R5A-I) was prepared using a conventional impregnation method. Various Ni-Al-based catalysts with Fe and Rh promoters were prepared via a polymer modified incipient method to improve the carbon coking resistance. These catalysts were tested under conditions of S/C = 1.17, O2/C = 0.24, 750 °C, and GHSV = 12,000 h-1 at DH or DHM fuel. R5A-I exhibited excellent catalytic performance in both DH and DHM fuels. However, carbon coking and sulfur poisoning resistance were observed in our previous study for the Ni-Al-based catalyst with the Fe promoter, which became deactivated with increasing reaction time at the DHM fuel. In the case of the Rh promoter addition to the Ni-Al-based catalysts, the catalytic performances decreased relatively slowly with increasing (from 1 wt.% (R1N50A) to 2 wt.% (R2N50A)) content of Rh2O3 at DHM fuel. The catalysts were analyzed via scanning electron microscopy combined with energy dispersive X-ray, X-ray diffraction, and X-ray photoelectron spectroscopy. Gas chromatography-mass spectrometry detected various types of hydrocarbons, e.g., ethylene (C2H4), with catalyst deactivation. The results revealed that, among the produced hydrocarbons, C2H4 played a major role in accelerating carbon deposition that blocks the reforming reaction. Therefore, Rh metal deserves consideration as a carbon coking inhibitor that prevents the negative effects of the C2H4 for autothermal reforming of diesel fuel in the presence of aromatic hydrocarbons. View Full-Text
Keywords: autothermal reforming; dodecane; hexadecane; 1-methylnaphthalene; nickel; rhodium; diesel; aromatic hydrocarbon autothermal reforming; dodecane; hexadecane; 1-methylnaphthalene; nickel; rhodium; diesel; aromatic hydrocarbon
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Ju, D.G.; Jo, S.B.; Ha, D.S.; Kim, T.Y.; Jung, S.Y.; Chae, H.J.; Lee, S.C.; Kim, J.C. Enhanced Ni-Al-Based Catalysts and Influence of Aromatic Hydrocarbon for Autothermal Reforming of Diesel Surrogate Fuel. Catalysts 2019, 9, 573.

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