Reforming of methane with carbon dioxide over cerium oxide promoted nickel nanoparticles deposited on 4-channel hollow fibers by atomic layer deposition,Catalysis Science & Technology

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Reforming of methane with carbon dioxide over cerium oxide promoted nickel nanoparticles deposited on 4-channel hollow fibers by atomic layer deposition
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-03-06 , DOI: 10.1039/d0cy00039f
Baitang Jin _{1,

2,

3,

4} , Zeyu Shang _{1,

2,

3,

4} , Shiguang Li _{4,

5,

6} , Ying-Bing Jiang _{4,

7,

8,

9} , Xuehong Gu _{10,

11,

12,

13,

14} , Xinhua Liang _{1,

2,

3,

4}

Affiliation

Ni nanoparticles were deposited on four-channel structured α-Al₂O₃ hollow fibers by atomic layer deposition (ALD). CeO₂ was loaded by a liquid phase incipient wetness method to promote Ni catalysts for dry reforming of methane. For Ni/Al₂O₃ prepared by ALD, inactive NiAl₂O₄ that originated from the Ni ALD process was incompletely reduced. The introduced CeO₂ was found to weaken the NiO–Al₂O₃ interaction, free NiO from NiO–Al₂O₃ or NiAl₂O₄, and improve the reducibility of NiO. The higher reducibility of NiAl₂O₄, tuned by CeO₂, further activated the catalyst during DRM, because a larger proportion of NiAl₂O₄ was gradually reduced to metallic nickel by the reaction products. The optimal catalytic performance reached a methane reforming rate of 2410 L h⁻¹ g_Ni⁻¹ at 850 °C. The CeO₂ promoted catalyst also exhibited an excellent performance after regeneration. In addition, the inhibition effect of CeO₂ on coke formation was observed, due to the enhanced CO₂ dissociative adsorption by CeO₂.

中文翻译：

在二氧化铈上用二氧化碳重整甲烷，通过原子层沉积法将镍纳米粒子沉积在4通道中空纤维上

镍纳米颗粒沉积在四通道结构的α-Al ₂ ö ₃通过原子层沉积（ALD）的中空纤维。通过液相初期润湿法负载CeO ₂以促进Ni催化剂用于甲烷的干重整。对于通过ALD制备的Ni / Al ₂ O ₃，未完全还原源自Ni ALD过程的惰性NiAl ₂ O ₄。发现引入的CeO ₂减弱了NiO-Al ₂ O _3的相互作用，从NiO-Al ₂ O ₃或NiAl ₂ O _4中释放出NiO。，并提高NiO的还原性。CeO ₂调节的NiAl ₂ O ₄的较高还原性在DRM期间进一步活化了催化剂，因为较大比例的NiAl ₂ O ₄被反应产物逐渐还原为金属镍。最佳催化性能在850°C下达到2410 L h ^-1 g _Ni^-1的甲烷重整速率。CeO ₂促进的催化剂在再生后也表现出优异的性能。此外，铈的抑制作用₂没有观察到对焦炭形成，由于增强CO ₂离解吸附通过的CeO ₂。

更新日期：2020-03-06

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