Boosting catalytic propane oxidation over PGM-free Co3O4 nanocrystal aggregates through chemical leaching: A comparative study with Pt and Pd based catalysts
Boosting catalytic propane oxidation over PGM-free Co3O4 nanocrystal aggregates through chemical leaching: A comparative study with Pt and Pd based catalysts
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DOI：
10.1016/j.apcatb.2017.12.075
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Wenxiang Tang;W. Xiao;Sibo Wang;Zheng Ren;J. Ding;P. Gao
中科院分区：
文献类型：
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作者：
Wenxiang Tang;W. Xiao;Sibo Wang;Zheng Ren;J. Ding;P. Gao
界面结构和化学性质的合理修饰可以帮助有效地定制非均相催化剂的反应性和稳定性，而不管它们的元素或化合物性质如何。在此，稀酸处理的设计和利用改性尖晶石Co 3 O 4纳米粒子的表面结构和化学。这种化学浸出策略显著提高了不含铂族金属的Co 3 O 4纳米颗粒聚集体的丙烷氧化活性，其活性远高于商业Al 2 O3负载的Pt和Pd催化剂，并且具有更丰富的缺陷、表面Co2+和化学吸附氧物种.这种表面修饰的Co 3 O 4纳米催化剂表现出优异的丙烷氧化效率和稳定性，而与O2和C3 H8浓度无关，其中商业Pt（或Pd）/Al 2 O3和自制Pt（或Pd）/CeO 2催化剂的活性受O2和C3 H8浓度的影响较大。同时，Co 3 O 4纳米团聚体催化剂在水和SO2存在下表现出良好的催化性能。这种简单的化学浸出技术为制备高活性和稳定的氧化物催化剂提供了一种潜在的方法。
Rational modification of interfacial structure and chemistry can help effectively tailor the reactivity and stability of heterogeneous catalysts regardless of their elemental or compound natures. Herein, a diluted acidic treatment was designed and utilized to modify the surface structure and chemistry of spinel Co3O4nanoparticles. Such a chemical leaching strategy has significantly promoted the propane oxidation activity of the PGM-free Co3O4nanocrystal aggregates.With a much higher activity than the commercial Al2O3supported Pt and Pd catalysts, these leached nanoparticle aggregates exhibited much more abundant defects, surface Co2+and chemisorbed oxygen species. Such surface-modified Co3O4nanocatalysts have displayed excellent and stable propane oxidation efficiency independent of both O2and C3H8concentrations, where the activities of both commercial Pt (or Pd)/Al2O3and self-made Pt (or Pd)/CeO2catalysts were greatly affected by different O2and C3H8concentrations. Meanwhile, the Co3O4nanocrystal aggregates catalyst exhibited good performance in presence of water or sulfur dioxide. This facile chemical leaching based technique provides a potential means to make highly active and stable oxide catalysts.