Synthesis and performance of ceria-zirconia supported Ni-Mo nanoparticles for partial oxidation of isooctane
Synthesis and performance of ceria-zirconia supported Ni-Mo nanoparticles for partial oxidation of isooctane
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DOI：
10.1016/j.apcatb.2017.04.055
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发表时间：
2017-09-05
影响因子：
22.1
通讯作者：
Ha, Su
中科院分区：
文献类型：
--
作者：
Bkour, Qusay;Zhao, Kai;Ha, Su
烧结和积炭导致的催化剂失活是负载型镍催化剂上电催化和催化烃类重整反应的主要问题之一。本文报道了用共浸渍法制备的以氧化铈为载体的镍钼双金属催化剂在高空速下对异辛烷部分氧化反应的催化性能。它也被用作传统的Ni/YSZ基固体氧化物燃料电池(SOFC)上的催化微重整化层，形成双层阳极。采用多种分析技术对催化剂进行了表征，考察了催化剂在750℃、常压、空气流量为100sccm、燃料流量为3ml/h、氧碳比为0.4的条件下对异辛烷部分氧化的催化性能。Mo的加入提高了催化剂的异辛烷转化率和合成气产率。最重要的是，Mo的存在提高了镍基催化剂的长期稳定性。钼强化了镍与载体之间的相互作用，改善了金属的整体分散性。进一步证明了Mo的加入可以显著提高Ni的耐碳性。将其用作异辛烷固体氧化物燃料电池的重整层时，电池在750℃下12h的降解速率很慢，仅为4.8 mV h(-1)。良好的催化活性和稳定性表明，Ni-Mo/CZ是一种优良的双层阳极材料，具有良好的抗焦性。(C)2017爱思唯尔B.V.保留所有权利。
Catalyst deactivation due to sintering and carbon deposition is one of the main issues associated with electrocatalysis and catalytic hydrocarbon reforming over supported Ni catalysts. We report a Ni-Mo bimetallic catalyst supported on ceria-zirconia (CZ) prepared using co-impregnation as an efficient catalyst for partial oxidation of isooctane at high space velocities. It is also used as a catalytic micro-reforming layer on a conventional Ni/YSZ-based solid oxide fuel cell (SOFC) to form a bi-layer anode. The catalysts were characterized using a number of analytical techniques and catalyst performance for partial oxidation of isooctane was investigated at 750 degrees C; atmospheric pressure; air and fuel flow rates of 100 sccm and 3 ml/h, respectively; and O-2/C ratio of 0.4. The addition of Mo increases the catalytic activity in terms of isooctane conversion and syngas yields. Most significantly, the presence of Mo enhances the long-term stability of the Ni-based catalyst. Molybdenum strengthens the interaction between Ni and the support and improves the overall metal dispersion. We have further demonstrated that the carbon tolerance of Ni can be significantly improved by Mo addition. When applied it as a reforming layer in a SOFC running on isooctane, the cell showed a very slow degradation rate of 4.8 mV h(-1) during 12 h of operation at 750 degrees C. The excellent catalytic activity and stability suggest that Ni-Mo/CZ is an excellent material for a bi-layer anode of SOFC with superior coke tolerance. (C) 2017 Elsevier B.V. All rights reserved.