Strong Structural Modification of Gd to Co3O4 for Catalyzing N2O Decomposition under Simulated Real Tail Gases.
Strong Structural Modification of Gd to Co3O4 for Catalyzing N2O Decomposition under Simulated Real Tail Gases.
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DOI：
10.1021/acs.est.1c05052
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发表时间：
2021-09
影响因子：
11.4
通讯作者：
Ying Xiong;Yumei Zhao;Xi Qi;Jiayi Qi;Yuanyuan Cui;Haibiao Yu;Ying Cao
中科院分区：
文献类型：
--
作者：
Ying Xiong;Yumei Zhao;Xi Qi;Jiayi Qi;Yuanyuan Cui;Haibiao Yu;Ying Cao
本文采用共沉淀法制备了Gd促进的Co 3 O 4催化剂，用于低温催化N2 O分解反应。由于Gd的添加，Gd 0.06Co催化剂中的Co 3 O 4的晶粒尺寸令人惊讶地降低到4.9nm，这比大多数添加剂改性的Co 3 O 4催化剂小得多。这种织构结构的巨大变化赋予了Gd 0.06Co催化剂大的比表面积、丰富的活性位和弱的Co-O键。因此，Gd 0.06 Co对2000 ppmv的N2 O分解表现出优异的上级催化活性，并且完全催化消除N2 O的温度低至350 °C。与纯Co 3 O 4相比，在300 °C下，Ea从77.4 kJ·mol-1降低到46.8 kJ·mol-1，反应的飞行时间从1.16 × 10 - 3s-1增加到5.13 × 10- 3s-1。此外，在100 ppmv NO、5体积% O2和2体积% H2O存在下，Gd0.06Co表现出相当稳定的催化性能。
In this paper, Gd-promoted Co3O4 catalysts were prepared via a facile coprecipitation method for low-temperature catalytic N2O decomposition. Due to the addition of Gd, the crystallite size of Co3O4 in the Gd0.06Co catalyst surprisingly decreased to 4.9 nm, which is much smaller than most additive-modified Co3O4 catalysts. This huge change in the catalyst's textural structure endows the Gd0.06Co catalyst with a large specific surface area, plentiful active sites, and a weak Co-O bond. Hence, Gd0.06Co exhibited superior activity for catalyzing 2000 ppmv N2O decomposition, and the temperature for the complete catalytic elimination of N2O was as low as 350 °C. Meanwhile, compared with pure Co3O4, Ea decreased from 77.4 to 46.8 kJ·mol-1 and TOF of the reaction increased from 1.16 × 10-3 s-1 to 5.13 × 10-3 s-1 at 300 °C. Moreover, Gd0.06Co displayed a quite stable catalytic performance in the presence of 100 ppmv NO, 5 vol % O2, and 2 vol % H2O.