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首页> 外文期刊>Applied Surface Science >Direct decomposition of methane over Pd promoted Ni/SBA-15 catalysts
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Direct decomposition of methane over Pd promoted Ni/SBA-15 catalysts

机译：Pd促进的Ni / SBA-15催化剂上甲烷的直接分解

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摘要

The catalytic performance of Ni/SBA-15 catalysts promoted with different loadings of Pd is investigated for the thermocatalytic decomposition of methane into COx-free hydrogen and nanocarbon. The catalysts are characterized in terms of their structural, textural and redox properties. The results showed that the Pd deposition increased the crystallinity of NiO and allowed the fine dispersion of NiO on the SBA-15 support. The decreased surface area of SBA-15 after Ni loading, due to pore blocking, increased after the Pd deposition. Moreover, it reduced the reduction temperatures of NiO interacting with the SBA-15 due to the spillover effect of hydrogen. Furthermore, the addition of Pd increased the catalytic efficiency of the catalysts. A maximum hydrogen yield of 59% is observed over the 0.4% Pd catalyst within 30 min of time on stream. No deactivation is observed until 420 min of streaming for all of the catalysts, indicating a high catalytic stability of the Ni/SBA-15 catalysts for methane decomposition. A new set of multi-walled carbon nanotubes with open tips were deposited over the catalysts, irrespective of the role of Pd and its loading. Moreover, a high graphitization degree and oxidation stability are observed for the nanotubes deposited over the 0.4% Pd catalyst. (C) 2015 Elsevier B.V. All rights reserved.
机译：研究了在不同的Pd负载下促进的Ni / SBA-15催化剂对甲烷热催化分解成无COx的氢和纳米碳的催化性能。催化剂以其结构，质地和氧化还原性能为特征。结果表明，Pd沉积增加了NiO的结晶度，并使NiO在SBA-15载体上精细分散。在Ni加载后，由于孔隙阻塞，SBA-15的表面积减少，在Pd沉积后增加。此外，由于氢的溢出效应，它降低了与SBA-15相互作用的NiO的还原温度。此外，Pd的添加提高了催化剂的催化效率。在运行30分钟内，在0.4％Pd催化剂上观察到59％的最大氢产率。直到所有催化剂流化420分钟，才观察到失活，这表明Ni / SBA-15催化剂对甲烷分解具有很高的催化稳定性。一组新的带有开口尖端的多壁碳纳米管被沉积在催化剂上，而与Pd的作用及其负载无关。此外，对于在0.4％Pd催化剂上沉积的纳米管，观察到高的石墨化度和氧化稳定性。 （C）2015 Elsevier B.V.保留所有权利。

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