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Title: Effect of phase transformation on the stability of Ni-Mg-Al catalyst for dry reforming of methane
Authors: Li, Na
Shen, Chaofeng
Tan, Pengjia
Zuo, Zhijun
Huang, Wei
Keywords: Catalysts;Hydrotalcite catalysts;Dry reforming;Carbon dioxide reforming;Syngas;Methane;Nickel;Magnesium oxide films;Aluminium
Issue Date: 21-Oct-2015
Publisher: NISCAIR-CSIR, India
Abstract: A series of Ni/Mg(Al)O hydrotalcite-derived catalysts are prepared via the carbonate co-precipitation method at different calcination temperatures. The performance and stability of the catalysts are studied through carbon dioxide reforming of CH4 to synthesis gas at 800 °C, atmospheric pressure, and gas hourly space velocity of 8000 mL/gcat h. The decrease in activity of catalysts calcined at 600, 700, and 800 °C results from the MgO film surrounding the Ni0 particles in the initial reaction stage. The activity is renewed and maintained when the MgO film is destroyed on reaction with Al2O3 to form the MgAl2O4 spinel-like phase. Formation of the MgAl2O4 spinel-like phase during the reaction is considered beneficial to the catalytic activity because of removal of the MgO film surrounding Ni0. The conversion of CH4 and CO2 is stable at over 95% after reaction for 2000 h. The catalysts have small Ni-metal particles, strong metal-support interaction and excellent anti-carbon deposition.
Page(s): 1198-1205
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.54A(10) [October 2015]

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