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Self‐Assembled Pd@CeO2/γ‐Al2O3 Catalysts with Enhanced Activity for Catalytic Methane Combustion
Small ( IF 13.0 ) Pub Date : 2017-06-14 , DOI: 10.1002/smll.201700941 Xilan Feng 1 , Wang Li 1 , Dapeng Liu 1 , Zheng Zhang 1 , Yang Duan 1 , Yu Zhang 1, 2
Small ( IF 13.0 ) Pub Date : 2017-06-14 , DOI: 10.1002/smll.201700941 Xilan Feng 1 , Wang Li 1 , Dapeng Liu 1 , Zheng Zhang 1 , Yang Duan 1 , Yu Zhang 1, 2
Affiliation
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Pd@CeO2/Al2O3 catalysts are of great importance for real applications, such as three‐way catalysis, CO oxidation, and methane combustion. In this article, the Pd@CeO2 core@shell nanospheres are prepared via the autoredox reaction in aqueous phase. Three kinds of methods are then employed, that is, electrostatic interaction, supramolecular self‐assembly, and physical mixing, to support the as‐prepared Pd@CeO2 nanospheres on γ‐Al2O3. A model reaction of catalytic methane‐combustion is employed here to evaluate the three Pd@CeO2/γ‐Al2O3 samples. As a result, the sample Pd@CeO2‐S‐850 prepared via supramolecular self‐assembly and calcined at 850 °C exhibits superior catalytic performance to the others, which has a far lower light‐off temperature (T50 of about 364 °C). Moreover, almost no deterioration of Pd@CeO2‐S‐850 is observed after five sequent catalytic cycles. The analysis of H2‐TPR curves concludes that there exists hydrogen spillover related to the strong metal–support interaction between Pd species and oxides. The strong metal–support interaction and the specific surface areas might be responsible for the catalytic performance of the Pd@CeO2 samples toward catalytic methane combustion.
中文翻译：
自组装的具有增强的甲烷燃烧活性的Pd @ CeO2 /γ-Al2O3催化剂
Pd @ CeO 2 / Al 2 O 3催化剂对于实际应用非常重要，例如三效催化，CO氧化和甲烷燃烧。本文通过水相中的自氧化还原反应制备了Pd @ CeO 2核壳纳米球。然后三种方法被采用，即，静电相互作用，超分子自组装，和物理混合，以支持所制备的Pd @的CeO 2个上的γ-Al纳米球2 ö 3。催化甲烷燃烧的模型反应在这里采用来评估三种钯@的CeO 2 /γ-Al系2个ö 3样品。结果，样本Pd @ CeO通过超分子自组装制备并在850°C煅烧的2 ‐S‐850表现出优于其他催化剂的催化性能，其起燃温度低得多（T 50约为364°C）。此外，在五个连续的催化循环后，几乎未观察到Pd @ CeO 2 -S-850的劣化。对H 2 -TPR曲线的分析得出结论，存在氢溢出与Pd物种与氧化物之间强烈的金属-载体相互作用有关。金属与载体之间的强相互作用和比表面积可能是Pd @ CeO 2样品对甲烷催化燃烧的催化性能。
更新日期：2017-06-14
中文翻译：
自组装的具有增强的甲烷燃烧活性的Pd @ CeO2 /γ-Al2O3催化剂
Pd @ CeO 2 / Al 2 O 3催化剂对于实际应用非常重要，例如三效催化，CO氧化和甲烷燃烧。本文通过水相中的自氧化还原反应制备了Pd @ CeO 2核壳纳米球。然后三种方法被采用，即，静电相互作用，超分子自组装，和物理混合，以支持所制备的Pd @的CeO 2个上的γ-Al纳米球2 ö 3。催化甲烷燃烧的模型反应在这里采用来评估三种钯@的CeO 2 /γ-Al系2个ö 3样品。结果，样本Pd @ CeO通过超分子自组装制备并在850°C煅烧的2 ‐S‐850表现出优于其他催化剂的催化性能，其起燃温度低得多（T 50约为364°C）。此外，在五个连续的催化循环后，几乎未观察到Pd @ CeO 2 -S-850的劣化。对H 2 -TPR曲线的分析得出结论，存在氢溢出与Pd物种与氧化物之间强烈的金属-载体相互作用有关。金属与载体之间的强相互作用和比表面积可能是Pd @ CeO 2样品对甲烷催化燃烧的催化性能。
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