NiO nanosheet array integrated monoliths for low temperature catalytic propane oxidation: A study on the promotion effect of Ce doping
NiO nanosheet array integrated monoliths for low temperature catalytic propane oxidation: A study on the promotion effect of Ce doping
复制标题
DOI：
10.1016/j.cattod.2020.07.086
复制
发表时间：
2021
期刊：
影响因子：
5.3
通讯作者：
Wenxiang Tang;Xingxu Lu;J. Weng;P. Gao
中科院分区：
文献类型：
--
作者：
Wenxiang Tang;Xingxu Lu;J. Weng;P. Gao
通过在蜂窝状单体上直接生长纳米结构阵列来构建坚固的催化剂是一种很有前途的技术，它可以以低材料使用量和低成本效益制造高活性反应器。在本研究中，将具有催化活性的NiO纳米片阵列均匀生长在堇青石蜂窝的通道表面，形成超低负载的单片催化剂。Ce掺杂可以显著提高原始NiO纳米片阵列的丙烷催化氧化性能。在NiO中掺杂了~ 4wt .%的Ce，在440°C下实现了90%丙烷氧化成二氧化碳的转化，与原始NiO相比，在24000 h−1的空速下降低了~ 40°C。在Ce的促进作用下，Ce掺杂的NiO纳米片阵列表现出更好的热稳定性，在425°C下运行48小时后，转化率损失仅为1.1%，而在原始NiO催化剂上的转化率损失为21.5%。
Constructing robust catalysts by growing nanostructure arrays directly onto honeycomb monoliths is a promising technology for fabricating highly active reactors with low materials usage and cost-effectiveness. In this study, catalytically active NiO nanosheet arrays were uniformly grown onto the channel surfaces of cordierite honeycombs to form monolithic catalysts with ultra-low loading. Ce doping was found to significantly enhance the catalytic propane oxidation performance of pristine NiO nanosheet arrays. With a Ce doping of ∼4 wt.% in NiO, a conversion of 90 % propane oxidation into CO2was achieved at 440 °C, a ∼40 °C decrease compared to the pristine NiO under a space velocity of 24,000 h−1. With the promoting effect of Ce, the Ce-doped NiO nanosheet arrays exhibited a much better thermal stability, with only 1.1 % loss of conversion after a 48 h operation at 425 °C, in comparison with a 21.5 % loss over the pristine NiO catalyst.