Zedan Abdallah F, Mohamed Assem T, El-Shall M Samy, AlQaradawi Siham Y, AlJaber Amina S
Department of Chemistry and Earth Sciences, Qatar University Doha 2713 Qatar
National Institute of Laser Enhanced Science, Cairo University Giza 12613 Egypt.
RSC Adv. 2018 May 29;8(35):19499-19511. doi: 10.1039/c8ra03623c. eCollection 2018 May 25.
Copper oxide (CuO) nanoparticles have received considerable interest as active and inexpensive catalysts for various gas-solid reactions. The CuO reducibility and surface reactivity are of crucial importance for the high catalytic activity. Herein, we demonstrate that the reducibility and stability of CuO nanoparticles can be controlled and tailored for the high catalytic activity of CO oxidation. The synthesized CuO nanoparticles possessed enhanced reducibility in CO atmosphere at lower reduction temperature of 126 °C compared to 284 °C for that of reference CuO particles. Moreover, the CuO catalysts with tailored reducibility demonstrated a reaction rate of 35 μmol s g and an apparent activation energy of 75 kJ mol. Furthermore, the tailored catalysts exhibited excellent long-term stability for CO oxidation for up to 48 h on stream. These readily-reducible CuO nanoparticles could serve as efficient, inexpensive and durable catalysts for CO oxidation at low temperatures.
氧化铜（CuO）纳米颗粒作为用于各种气固反应的活性且廉价的催化剂受到了广泛关注。CuO的还原性和表面反应性对于高催化活性至关重要。在此，我们证明了可以控制和调整CuO纳米颗粒的还原性和稳定性，以实现CO氧化的高催化活性。与参比CuO颗粒在284℃的还原温度相比，合成的CuO纳米颗粒在126℃的较低还原温度下在CO气氛中具有增强的还原性。此外，具有定制还原性的CuO催化剂表现出35 μmol s g的反应速率和75 kJ mol的表观活化能。此外，定制的催化剂在长达48小时的连续运行中对CO氧化表现出优异的长期稳定性。这些易于还原的CuO纳米颗粒可作为低温下CO氧化的高效、廉价且耐用的催化剂。
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