High resistance to carbon deposition of silica-coated Ni catalysts in propane stream reforming
High resistance to carbon deposition of silica-coated Ni catalysts in propane stream reforming
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DOI：
10.1016/j.apcata.2008.09.017
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发表时间：
2008-12
影响因子：
5.5
通讯作者：
S. Takenaka;Yoshiki Orita;Hiroshi Umebayashi;H. Matsune;M. Kishida
中科院分区：
文献类型：
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作者：
S. Takenaka;Yoshiki Orita;Hiroshi Umebayashi;H. Matsune;M. Kishida
将均匀覆盖二氧化硅层的镍金属催化剂用于丙烷蒸汽重整的催化性能与负载在氧化镁（MgO）、氧化铝（Al2O3）和二氧化硅（SiO2）基质上的镍金属催化剂的性能进行了比较。二氧化硅涂层镍催化剂在 873K 的丙烷蒸汽重整中表现出高活性。该催化活性高于有效的轻质烷烃蒸汽重整Ni/Al2O3和Ni/MgO催化剂的活性，并且我们发现二氧化硅负载的Ni金属的催化活性较差。因此，用二氧化硅覆盖镍金属颗粒提高了它们对该反应的催化活性。 873K 丙烷水蒸气重整过程中二氧化硅涂层 Ni 催化剂的积炭量低于 Ni/MgO 和 Ni/Al2O3。二氧化硅涂层镍催化剂的 Ni K 边 XANES 和 EXAFS 光谱显示镍金属和二氧化硅之间存在强烈的相互作用。这种相互作用可以防止丙烷蒸汽重整过程中镍金属颗粒的烧结，从而减少二氧化硅涂层镍催化剂上的碳沉积。二氧化硅涂层镍催化剂的这些特性导致高催化活性和改进的催化剂稳定性。
The catalytic performance of Ni metal catalysts uniformly covered with layers of silica for propane steam reforming was compared with the performances of Ni metal catalysts supported on substrates of magnesia (MgO), alumina (Al2O3) and silica (SiO2). The silica-coated Ni catalysts showed high activity for propane steam reforming at 873K. This catalytic activity is higher than the activity of effective light alkane steam reforming Ni/Al2O3and Ni/MgO catalysts and we found that the catalytic activity of the silica-supported Ni metal was poor. The coverage of Ni metal particles with silica thus improves their catalytic activity for this reaction. Carbon deposition on silica-coated Ni catalysts during the steam reforming of propane at 873K was lower than that on Ni/MgO and Ni/Al2O3. Ni K-edge XANES and EXAFS spectra of silica-coated Ni catalyst showed a strong interaction between Ni metal and silica. This interaction prevents the sintering of Ni metal particles during the propane steam reforming, which results in the reduction of carbon deposition on silica-coated Ni catalysts. These properties of silica-coated Ni catalysts result in high catalytic activity and improved catalyst stability.