催化氧化法是治理挥发性有机化合物（VOCs）的有效途径，其核心是开发低温、高效和稳定的催化剂。基于此，以金属硝酸盐为原料，采用溶胶-凝胶法制备了尖晶石相CoAl₂O₄催化剂，探究了催化剂的最佳制备条件及最优评价条件，主要包括煅烧温度、气体流速、催化剂用量和评价温度。并利用X射线衍射法（XRD）、扫描电子显微镜技术（SEM）、比表面积分析（BET）、热重分析（TG）和X-射线光电子能谱（XPS）等表征手段探究催化剂具有高催化活性的原因。研究结果表明，CoAl₂O₄催化剂在煅烧温度为700℃时对乙苯的催化效果最好，乙苯转化率为90%时的温度(T90)达到311℃。同时，在气体流速为20 mL/min，催化剂用量为0.2 g，评价温度为400℃时，CoAl₂O₄催化剂拥有较高的催化活性，对乙苯的转化率达到96%以上。

Catalytic oxidation is an effective way to treat volatile organic compounds (VOCs), whose core is to develop stable catalysts with low temperature and high efficiency. Based on this, the catalyst of CoAl₂O₄ was prepared using metal nitrate as raw materials by the method of sol-gel. The optimum preparation conditions and optimal evaluation conditions were investigated, including calcination temperature, gas flow rate, catalyst dosage and evaluation temperature. X-ray diffraction (XRD), scanning electron microscopy (SEM), specific surface area analysis (BET), thermogravimetric analysis (TG) and X-ray photoelectron spectroscopy (XPS) were used to explore the reasons for the high catalytic activity of the catalyst. The results show that the catalyst of CoAl₂O₄ has the best catalytic effect on ethylbenzene when the calcination temperature is 700℃. And the temperature (T90) reaches 311℃ when the conversion of ethylbenzene is 90%. Besides, the catalyst of CoAl₂O₄ has high catalytic activity, and the conversion of ethylbenzene is more than 96%，when the gas flow rate is 20 mL/min, the amount of catalyst is 0.2 g and the evaluation temperature is 400℃.