Ni-Ce复合协同促进CO同步催化去除NO的性能和机理

马倩; 王赫; 屈嘉鑫; 吉硕; 王薇; 黄宇; 党小庆

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (2) : 671-681.

大气污染与控制

Ni-Ce复合协同促进CO同步催化去除NO的性能和机理

马倩^1,2, 王赫^1,2, 屈嘉鑫^1,2, 吉硕^1,2, 王薇³, 黄宇⁴, 党小庆¹

作者信息 +

Performance and mechanism of Ni-Ce composite synergistically promoting CO-selective catalytic reduction of NO

MA Qian^1,2, WANG He^1,2, QU Jia-xin^1,2, JI Shuo^1,2, WANG Wei³, HUANG Yu⁴, DANG Xiao-qing¹

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文章历史 +

摘要

采用水热法制备了双金属NiCe-x(x=1:3、2:2、3:1、0:1、1:0)催化剂,并应用于CO选择性催化还原NO(CO-SCR)反应.结果显示,与NiO和CeO₂催化剂相比,NiCe复合催化剂展现出了优良的低温CO同步催化去除NO的性能,其中NiCe比例为3:1的催化剂在200~450 ℃的宽温域达到90%以上的NO转化率,并且表现出对H₂O和SO₂的良好耐受性.利用表征手段对样品的结构和性能进行了探究,发现NiCe双金属催化剂的比表面积较单一金属氧化物均提高,NiCe复合催化剂中Ce⁴⁺和Ce³⁺之间的电子转移增加了催化剂表面的氧空位,Ni和Ce离子共存促使氧化还原循环(Ce³⁺+Ni³⁺↔Ce⁴⁺+Ni²⁺)增强,进而提高了催化剂脱硝活性.最后,基于原位DRIFTS结果,发现吸附的NCO是NiCe-3:1在CO同步催化去除NO过程中的重要中间物种.

Abstract

The bimetallic NiCe-x(x=1:3, 2:2, 3:1, 0:1, 1:0)catalysts were successfully synthesized using the hydrothermal method and subsequently evaluated for their efficacy in the selective catalytic reduction of NO by CO(CO-SCR). The results indicated that compared to NiO and CeO₂ catalysts, the NiCe composite catalyst exhibited superior performance in simultaneously removing low-temperature CO and NO. Superior performance was demonstrated by the NiCe composite catalyst with a 3:1 ratio, which achieved over 90% NO conversion over an extensive temperature range of 200~450℃ and exhibited strong resistance to SO₂ and H₂O. Characterization indicated that the existence of Ni and Ce ions led to an increased specific surface area and accelerated redox cycling (Ce³⁺+Ni³⁺↔Ce⁴⁺+Ni²⁺), which improved denitrification activity. In-situ DRIFTS findings confirmed that adsorbed NCO played a crucial role as an intermediate in the CO-SCR process employing NiCe-3:1.

导出引用

马倩, 王赫, 屈嘉鑫, 吉硕, 王薇, 黄宇, 党小庆. Ni-Ce复合协同促进CO同步催化去除NO的性能和机理[J]. 中国环境科学. 2025, 45(2): 671-681

MA Qian, WANG He, QU Jia-xin, JI Shuo, WANG Wei, HUANG Yu, DANG Xiao-qing. Performance and mechanism of Ni-Ce composite synergistically promoting CO-selective catalytic reduction of NO[J]. China Environmental Science. 2025, 45(2): 671-681

中图分类号： X701

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