Investigation on Deactivation and Regeneration of a Commercial Ni/Al_2O_3 Catalyst in Coal Volatile Decomposition

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概要

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• The deactivation mechanism of a commercial Ni/Al2O3 catalyst used during coal volatile decomposition was investigated by transmission electron microscopy–energy dispersive X-ray spectroscopy (TEM-EDS), X-ray diffraction (XRD) and nitrogen adsorption. The existence of carbonous species in the reaction system promoted nickel particle growth during coal volatile decomposition, and subsequent coking from volatile cracking. Throughout the catalyst deactivation tests, coke deposits were observed as encapsulating carbon in the spent catalyst, and nickel particles doubled in size from around 10 to 20 nm. The spent catalyst was regenerated in oxygen at relatively moderate conditions by removing the coke deposits. As a result, the catalyst activity was restored remarkably; 1.7 times the surface area and double pore volume were present in the regenerated catalyst compared to the spent catalyst. Also, the regenerated catalyst showed high activity for coal volatile decomposition. Under catalysis of the regenerated Ni/Al2O3, the tarry material in coal volatile matter could transform much more completely, gaining both high gas yields and high carbon balance.We also found that methanation is structure sensitive to nickel particles. Under the action of the regenerated catalyst, CO formed during coal volatile decomposition could not be further converted into methane, and the product gases provided a higher CO concentration. Noticeably, tar decomposition was confirmed to be less structure sensitive to the nickel particles than CO-methanation.

• 社団法人 化学工学会の論文
• 2008-09-01

著者

• TAKARADA Takayuki

  Department of Chemical and Environmental Engineering, Gunma University

• Morishita Kayoko

  Department of Chemical and Environmental Engineering, Gunma University

• Li Liuyun

  Gunma Industry Support Organization

• Ozaki Jun-ichi

  Department Of Chemical And Environmental Engineering Graduate School Of Engineering Gunma University

• Ozaki Jun-ichi

  Department Of Chemical And Environmental Engineering Gunma University

• IDA Chiemi

  Department of Chemical and Environmental Engineering, Gunma University

• TAKEI Masaaki

  Department of Chemical and Environmental Engineering, Gunma University

• Ida Chiemi

  Department Of Chemical And Environmental Engineering Gunma University

• Takei Masaaki

  Department Of Chemical And Environmental Engineering Gunma University

• Morishita Kayoko

  Department Of Chemical And Environmental Engineering Gunma University

• Takarada Takayuki

  Department Of Biological And Chemical Engineering Gunma University

• Takarada Takayuki

  Department Of Chemical And Environmental Engineering Gunma University

• Takarada Takayuki

  Dep. Of Chemical And Environmental Engineering Gunma Univ.

• Morishita Kayoko

  Dep. Of Chemical And Environmental Engineering Gunma Univ.

• Morishita Kayoko

  Department of Biological and Chemical Engineering, Gunma University

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