High carbon-resistance Ni/CeAlO3-Al2O3 catalyst for CH4/CO2 reforming
High carbon-resistance Ni/CeAlO3-Al2O3 catalyst for CH4/CO2 reforming
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CH4/CO2重整用高抗碳Ni/CeAlO3-Al2O3催化剂
DOI：
10.1016/j.apcatb.2013.01.044
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发表时间：
2013-06-05
影响因子：
22.1
通讯作者：
Lu, Yong
中科院分区：
文献类型：
--
作者：
Chen, Wei;Zhao, Guofeng;Lu, Yong
甲烷干重整反应（DRM）是CO2化学循环制燃料/化学品的一个重要研究领域，高抗碳性Ni/Ce-AlO催化剂已被开发出来。铈在900 ℃还原后以CeAlO 3相的形式存在，在运行条件下也是如此。CeAlO 3相的形成显著提高了催化剂的抗积炭性能，而不降低活性。然而，具有或不具有CeAlO 3的催化剂在800 ℃下使用20，000 mL h（-1）g（cat）（-1）测试的250 h内均显示出良好的活性保持，它们的碳沉积量随着CeAlO 3相的增加而显示出从0.92 g g（cat）（-1）沿着显著降低。CeAlO 3的存在抑制了石墨碳在镍表面的生长，而非晶碳的形成与CeAlO 3无关。CeAlO 3物种显示出分解CO2形成活性表面氧的能力，因此，抗碳性的促进被认为是由于Ni颗粒周围的氧化环境。(C)2013爱思唯尔有限公司版权所有。
High carbon-resistance Ni/Ce-AlO catalysts have been developed for dry reforming of methane (DRM) that is attracting growing attention for chemical recycling of CO2 to fuels/chemicals. Cerium is definitely identified to exist in the form of CeAlO3 phase after reduction at 900 degrees C, and so is it under running conditions. The formation of CeAlO3 phase significantly enhances the catalyst carbon-resistance without decreasing the activity. Whereas the catalysts with or without CeAlO3 all show good activity maintenance within 250 h testing at 800 degrees C using 20,000 mL h(-1) g(cat)(-1), their carbon deposition amounts exhibit significant decrease from 0.92 to 0.29 g g(cat)(-1) along with the increase of the CeAlO3 phase. The presence of CeAlO3 can inhibit growth of graphitic carbon on nickel surface while the formation of amorphous carbon is independent of the CeAlO3. The CeAlO3 species shows ability for decomposing CO2 to form active surface oxygen and therefore the carbon-resistance promotion by nature is suggested to be contributed to an oxidative environment around Ni particles. (C) 2013 Elsevier B.V. All rights reserved.