燃料化学学报2011，Vol.39Issue(3)：224-228,5.
不同形貌Ni/γ-Al2O3催化剂催化CO甲烷化反应的研究
CO methanation over Ni/γ-Al2 O3 catalysts with different morphologies
摘要
Abstract
NiO with different morphologies were prepared by precipitation method and then the NiO/γ-Al2O3 catalysts were prepared from NiO and γ-Al2O3 by grind-mixing method. These catalysts were characterized by means of TEM, XRD and H2-TPR techniques. TEM images show that the morphologies of three NiO phases ( aNiO, b-NiO and c-NiO) obtained are in the shape of rod, granule and sheet, respectively. H2-TPR profiles show that the oxidabilities of these catalysts are in the order of b-NiO/γ-Al2O3 ＜ a-NiO/γ-Al2O3 ＜ c-NiO/γ-Al2O3.XRD patterns show that the crystalline sizes of Ni in these catalysts after reduction are in the order of b-Ni ＞ a-Ni ＞ c-Ni. CO methanation was carried out over the Ni/γ-Al2O3 catalysts in a continuous flow fixed-bed reactor and the effects of mixing method and morphology of active species on the catalysts perforce were investigated. It is found that the catalyst prepared from grind-mixing exhibits higher activity and stability than that obtained from simple-mixing. The catalytic activities of these catalysts with different morphologies for CO methanation follow the order of c-Ni/γ-Al2O3＞ a-Ni/γ-Al2O3＞ b-Ni/γ-Al2O3. Over the c-Ni/γ-Al2O3 catalyst (wNi = 15％ ) under the conditions of atmospheric pressure, 593 K and a space velocity of 2 500 h-1 , the conversion of CO and the selectivity to CH4 reach 99.63％ and 90.80％, respectively.关键词
CO/甲烷化/镍催化剂/形貌Key words
carbon monoxide/ methanation/ nickel catalyst/ morphology分类
化学引用本文复制引用
马胜利,谭猗生,张清德,韩怡卓..不同形貌Ni/γ-Al2O3催化剂催化CO甲烷化反应的研究[J].燃料化学学报,2011,39(3):224-228,5.基金项目
国家科技部自主研究课题(2008BWZ005). （2008BWZ005）
