CAJ | 학술논문

以堇青石蜂窝陶瓷为基底,A12O3浆料为过渡胶体,Cu和Co为催化活性组分,制备了一系列CuxCo1-x/Al2O3/堇青石(x=0～1)整体式催化剂.采用X射线衍射、X射线光电子能谱、扫描电镜和程序升温还原等手段对催化剂进行了表征.以甲苯为模型化合物.在微型固定床反应器上评价了催化剂的催化性能.结果表明,当Cu含量较低时,在整体式催化剂上形成了Cu-Co-O固溶体:当Cu含量较高时,可以检测到CuO.在催化剂表面,Co以CO2+和CO3+形式存在,而Cu主要以Cu2+形式存在.适量Cu的加入可以改善催化剂中Co的氧化还原性能,有利于催化剂活性的提高.在所制备的催化剂中,Cu0.5Co0.5/Al2O3/堇青石整体式催化剂活性最高.在315℃可以完全催化燃烧消除甲苯.
이근청석봉와도자위기저,A12O3장료위과도효체,Cu화Co위최화활성조분,제비료일계렬CuxCo1-x/Al2O3/근청석(x=0～1)정체식최화제.채용X사선연사、X사선광전자능보、소묘전경화정서승온환원등수단대최화제진행료표정.이갑분위모형화합물.재미형고정상반응기상평개료최화제적최화성능.결과표명,당Cu함량교저시,재정체식최화제상형성료Cu-Co-O고용체:당Cu함량교고시,가이검측도CuO.재최화제표면,Co이CO2+화CO3+형식존재,이Cu주요이Cu2+형식존재.괄량Cu적가입가이개선최화제중Co적양화환원성능,유리우최화제활성적제고.재소제비적최화제중,Cu0.5Co0.5/Al2O3/근청석정체식최화제활성최고.재315℃가이완전최화연소소제갑분.
A series of CuxCo1-x/Al2O3/cordierite (x = 0-1) catalysts were prepared using cordierite as a support, a boehmite primer sol as the first washcoat layer and copper as well as cobalt oxides as the activity washcoat layer. The structure of the catalysts was characterized using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and temperature-programmed reduction. Toluene was chosen as a model compound to evaluate the catalytic activity in a conventional fixed-bed quartz reactor. The results indicate that Cu-Co-O was present when the Cu content was low. CuO diffraction peaks were observed when the Cu content was high. Both Co2+ and Co3+ exist on the surface of the obtained monolithic catalysts while Cu2+ is the main Cu species. The addition of a certain amount of copper oxide improved the reducibility of the cobalt oxide, which enhanced the catalytic activity of the catalysts. All the obtained catalysts showed good activity for the catalytic combustion of toluene. The Cu0.5Co0.5/Al2O3/cordierite catalyst showed the best catalytic activity. Toluene was completely oxidized at 315℃.