Dry reforming of methane over Ni/La2O3 nanorod catalysts with stabilized Ni nanoparticles
Dry reforming of methane over Ni/La2O3 nanorod catalysts with stabilized Ni nanoparticles
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具有稳定 Ni 纳米颗粒的 Ni/La2O3 纳米棒催化剂上的甲烷干重整
DOI：
10.1016/j.apcatb.2016.09.071
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发表时间：
2017-03-01
影响因子：
22.1
通讯作者：
Gong, Jinlong
中科院分区：
文献类型：
--
作者：
Li, Xinyu;Li, Di;Gong, Jinlong
本文描述了使用 La2O2CO3 纳米棒作为载体前驱体（表示为 Ni/La2O3-LOC），通过湿浸渍法进行甲烷干重整（DRM）的 Ni/La2O3 催化剂的设计。结果表明，源自La2O2CO3前驱体的La2O3在热处理后保持了其初始形态，并且可以在其上高度分散Ni颗粒。此外，纳米棒状载体可以提供更多中等强度的碱性位点，以促进二氧化碳在其表面的吸附和活化。因此，Ni/La2O3-LOC催化剂在700℃下经过50小时的DRM反应后，CH4转化率达到70%，CO2转化率达到75%，H-2/CO比为0.87。增强的金属-载体相互作用限制了镍颗粒在恶劣反应条件下的烧结。还研究了催化剂上的焦炭演化，以了解焦炭形成机制以及 La2O2CO3 在焦炭消除中的作用。研究发现，镍分散度会影响催化剂表面焦炭和La2O2CO3的分布，两者与催化性能密切相关。 (C) 2016 Elsevier B.V. 保留所有权利。
This paper describes the design of a Ni/La2O3 catalyst using La2O2CO3 nanorod as a support precursor (denoted as Ni/La2O3-LOC) via a wet impregnation method for dry reforming of methane (DRM). The results showed that La2O3 derived from the La2O2CO3 precursor maintained its initial morphology upon thermal treatment and could highly disperse Ni particles on it. Additionally, the nanorod-shaped support could provide more medium-strength basic sites to facilitate CO2 adsorption and activation on its surface. Consequently, the Ni/La2O3-LOC catalyst reached 70% of CH4 conversion and 75% of CO2 conversion at 700 degrees C after 50 h DRM reaction with a H-2/CO ratio of 0.87. The enhanced metal-support interaction restricted the sintering of nickel particles under harsh reaction conditions. Coke evolution on the catalysts was also investigated to understand coke formation mechanism and the role of La2O2CO3 in coke elimination. It has been found that nickel dispersion can affect distribution of coke and La2O2CO3 on the surface of catalyst, both of which have a close relation with catalytic performance. (C) 2016 Elsevier B.V. All rights reserved.