(1. 江蘇工業(yè)學(xué)院 材料科學(xué)與工程學(xué)院，常州 213164；
2. 江蘇工業(yè)學(xué)院 常州市高分子新材料重點(diǎn)實(shí)驗(yàn)室，常州 213164)
摘 要: 以硝酸鈰和氫氧化鈉為原料，使用超聲霧化工藝實(shí)現(xiàn)微區(qū)反應(yīng)制備納米CeO2粉體和摻銅CeO2復(fù)合粉體；再以硝酸鈰為鈰源，氨水為沉淀劑，用凹凸棒石為載體合成凹凸棒石負(fù)載CeO2納米復(fù)合材料。利用XRD、TEM、HRTEM和BET-N2等手段對(duì)所得產(chǎn)物的成分、物相結(jié)構(gòu)和形貌進(jìn)行表征，研究所制備的納米CeO2及其復(fù)合催化劑對(duì)CO氧化的催化性能。結(jié)果表明：所制備的納米CeO2粉體和摻銅CeO2復(fù)合粉體呈球形，粒徑均為4~5 nm，且單分散性好；所合成的CeO2/凹凸棒石納米復(fù)合材料中，CeO2顆粒均勻包覆在凹凸棒石表面。催化實(shí)驗(yàn)結(jié)果表明：CeO2顆粒越小、比表面積越大，對(duì)CO氧化的催化活性就越高；凹凸棒石負(fù)載CeO2納米復(fù)合催化劑具有很強(qiáng)的協(xié)同催化效應(yīng)，可提高其催化活性；Cu(5%)-Ce-O催化劑對(duì)CO氧化具有最好的催化活性，表明銅的摻入有利于提高CeO2在CO催化氧化反應(yīng)中的低溫活性，降低起燃溫度。
關(guān)鍵字: 氧化鈰；凹凸棒石；超聲霧化；摻雜；復(fù)合催化劑；催化氧化
（1. School of Materials Science and Engineering, Jiangsu Polytechnic University, Changzhou, 213164, China;
2. Changzhou Key Laboratory of Polymer Materials, Jiangsu Polytechnic University, Changzhou 213164, China）
Abstract: CeO2 and Cu-doped CeO2 nano-particles were prepared by ultrasonic automization method using cerium nitrate, copper nitrate and sodium hydroxide as raw materials, and the palygorskite supported with CeO2 composite nanocatalyst was synthesized by liquid phase precipitation process using cerium nitrate as cerium resource and ammonia as precipitating agent. The as-prepared samples were characterized by X-ray diffractometry(XRD), transmission electron microscopy(TEM), high resolution TEM and Brunauer-Emmett-Teller procedure( BET-N2). The catalytic performances of samples for CO oxidation were examined. The results show that the well dispersed and uniformly distributed CeO2 and Cu-doped CeO2 particles with size of about 4−5 nm are obtained, and the nano-CeO2 particles are coated on the surface of palygorskite homogeneously and densely by the above methods. The results of catalytic tests exhibit that the supported-catalyst has a positive synergistic catalytic effect, thus shows excellent catalytic activity for CO oxidation. The catalytic activity for CO oxidation obviously depends on the size of CeO2 particles, and Cu dopant significantly enhances the catalytic efficiency.
Key words: ceria; palygorskite; ultrasonic automization; doping; composite catalyzer; catalytic oxidation
