Oxidative steam reforming of methane under atmospheric and pressurized conditions over Pd/NiO–MgO solid solution catalysts
Oxidative steam reforming of methane under atmospheric and pressurized conditions over Pd/NiO–MgO solid solution catalysts
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DOI：
10.1016/j.apcata.2006.03.054
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发表时间：
2006-07
影响因子：
5.5
通讯作者：
M. Nurunnabi;Yuya Mukainakano;S. Kado;Tomohisa Miyazawa;K. Okumura;T. Miyao;S. Naito;Kimihito Suzuki;K. Fujimoto;K. Kunimori;K. Tomishige
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文献类型：
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作者：
M. Nurunnabi;Yuya Mukainakano;S. Kado;Tomohisa Miyazawa;K. Okumura;T. Miyao;S. Naito;Kimihito Suzuki;K. Fujimoto;K. Kunimori;K. Tomishige
在常压和加压条件下，研究了Pd在NiO-MgO固溶体中的负载量对甲烷氧化水蒸气重整反应的影响。在Ni_（0.2）Mg_（0.8）O催化剂失活的情况下，少量Pd的加入抑制了Ni物种的氧化，在常压低W/F条件下，混合物仍能保持重整能力。此外，在加压条件下添加少量Pd，Ni_（0.2）Mg_（0.8）O催化剂的活性和稳定性都得到显著提高。失活速率与积炭量密切相关。TEM、TPR、EXAFS和FTIR表征结果表明，Pd/Ni_（0.2）Mg_（0.8）O催化剂上形成了Pd-Ni合金颗粒。低Pd/Ni比的Pd-Ni合金颗粒在高抗积碳性能中起重要作用。
The effect of the Pd loading in NiO–MgO solid solution was investigated in oxidative steam reforming of methane under atmospheric and pressurized conditions. The small amounts of Pd addition on Ni0.2Mg0.8O can inhibit the oxidation of Ni species and the mixture can maintain the reforming ability at low W/F conditions under atmospheric pressure, where Ni0.2Mg0.8O catalyst deactivated. In addition, Ni0.2Mg0.8O catalyst improved remarkably, gaining both high activity and excellent stability by the addition of small amounts of Pd under pressurized conditions. The deactivation rate was closely related to the amount of deposited carbon. Characterization results of TEM, TPR, EXAFS and FTIR suggest that Pd–Ni alloy particles are formed on Pd/Ni0.2Mg0.8O catalysts. The Pd–Ni alloy particles with a low ratio of Pd to Ni can play an important role in the high resistance to carbon deposition.