制备了Ce-Cr-Ni/TiO₂蜂窝状脱硝催化剂，并用于选择性催化还原NO_x，以CO为还原剂，考察了其催化活性以及稀土元素Ce的掺加对催化活性的影响。经过脱硝效率检测发现，催化剂具有较好的催化活性，掺加稀土元素Ce后催化剂的催化活性得到进一步提高，其中1.1Ce-Cr-Ni/TiO₂脱硝效率最高，在550℃时NO_x转化率达到97.8%。通过比表面积测定（BET）、X射线衍射（XRD）、能谱仪（EDS）、X射线光电子能谱分析（XPS）以及H₂-程序升温还原（H₂-TPR）等方法对催化剂进行了表征，结果表明，稀土元素Ce的掺加在一定程度上提高了催化剂的BET比表面积；与2.3Cr-Ni/TiO₂相比，催化剂1.1Ce-2.3Cr-Ni/TiO₂中的活性组分分布均匀，且具有较高的Ni³⁺/Ni²⁺比值和表面吸附氧（O_α）含量以及较强的氧化还原能力，这为催化剂脱硝性能的提高提供了有利条件。

Honeycomb denitration catalyst Ce-Cr-Ni/TiO₂ is prepared and used in the selective catalytic reduction of NO_x with CO as reducing agent.The catalytic activity of Ce-Cr-Ni/TiO₂ is evaluated and the effect of Ce doping on the catalytic activity is investigated.It is found through denitrification efficiency testing that the catalyst has better catalytic activity,which can be further improved after addition of Ce.The 1.1Ce-Cr-Ni/TiO₂ catalyst exhibits the highest denitration efficiency,with the conversion of NO_x reaching 97.3% at 550℃.This catalyst is characterized by specific surface area detection (BET),X-ray diffraction (XRD),energy dispersive spectroscopy (EDS),X-ray photoelectron spectroscopy (XPS),and H₂ temperature-programmed reduction (H₂-TPR).The characterization results show that the addition of Ce can increase the BET specific surface area of the catalyst to a certain extent.The 1.1Ce-2.3Cr-Ni/TiO₂ catalyst has higher dispersion of the active components,higher Ni³⁺/Ni²⁺ ratio,more surface adsorption oxygen (O_β) and stronger redox capacity that 2.3Cr-Ni/TiO₂ catalyst,which is beneficial to improve its catalytic activity in removing NO_x.

姚佳(1993-),女,硕士研究生,研究方向为脱硝催化剂,y_jia016@163.com