Bennici Simona, Gervasini Antonella, Lazzarin Marta, Ragaini Vittorio
Dipartimento di Chimica Fisica ed Elettrochimica, Università degli Studi di Milano, via Camillo Golgi 19, I-20133 Milano, Italy.
Ultrason Sonochem. 2005 Mar;12(4):307-12. doi: 10.1016/j.ultsonch.2004.01.032.
A series of dispersed CuO catalysts supported on modified silica supports with Al2O3 (SA), TiO2 (ST), and ZrO2 (SZ) were prepared optimising the adsorption method of copper deposition assisted by ultrasound treatment, already reported in a previous paper (S. Bennici, A. Gervasini, V. Ragaini, Ultrason. Sonochem. 10 (2003) 61). The obtained catalysts were characterized in their bulk (atomic absorption, X-ray diffraction, temperature programmed reduction) and surface (N2 adsorption, X-ray photoelectron spectroscopy, scanning electron microscopy) properties. The morphology of the finished materials was not deeply modified compared with that of the relevant supports. The employed complemented techniques evidenced a well dispersed CuO phase with a copper-support interaction on the most acidic supports (SA and SZ). The catalyst performances were studied in the reaction of selective catalytic reduction of NOx with ethene in oxidizing atmosphere in a flow apparatus under variable times (0.360-0.072 s) and temperatures (200-450 degrees C). The catalysts prepared on the most acidic supports (SA and SZ) were the most active and selective towards N2 formation. They showed a particular interesting activity in the reaction of NO2 reduction besides that of NO reduction.
通过超声处理辅助铜沉积的吸附方法制备了一系列负载在改性二氧化硅载体（含Al2O3的SA、含TiO2的ST和含ZrO2的SZ）上的分散型CuO催化剂，该方法已在前一篇论文（S. Bennici、A. Gervasini、V. Ragaini，《超声化学》10 (2003) 61）中报道。对所制备的催化剂进行了体相（原子吸收、X射线衍射、程序升温还原）和表面（N2吸附、X射线光电子能谱、扫描电子显微镜）性质的表征。与相关载体相比，成品材料的形态没有发生深度改变。所采用的补充技术表明，在酸性最强的载体（SA和SZ）上，CuO相分散良好，且存在铜-载体相互作用。在流动装置中，于可变时间（0.360 - 0.072 s）和温度（200 - 450℃）下，在氧化气氛中研究了催化剂在乙烯选择性催化还原NOx反应中的性能。在酸性最强的载体（SA和SZ）上制备的催化剂对N2生成最具活性和选择性。除了NO还原反应外，它们在NO2还原反应中还表现出特别有趣的活性。
