CAJ | 학술논문

以FeCrAl合金薄片为基底,Al2O3浆料为过渡胶体,不同摩尔比的Cu、Co为催化活性组分,制备了一系列CuxCo1-x/Al2O3/FeCrAl(x=0-1)新型整体式催化剂.采用X射线粉末衍射(XRD),扫描电子显微镜(SEM),X光电子能谱(XPS)和程序升温还原(TPR)等手段对催化剂的结构进行了表征.在微型固定床反应器上评价了催化剂的催化甲苯燃烧性能.研究结果表明:在所制备的整体式催化剂上,当Cu含量比较低时,形成了Cu-Co-O固溶体;当Cu含量比较高时,可以测得CuO的衍射峰.催化剂表面颗粒大小和形貌与Cu、Co摩尔比密切相关.在催化剂表面,Co以Co2+和Co3+价态存在,而Cu主要以Cu2+价态存在.催化剂中的Cu可以改善Co的氧化还原性,从而有利于催化剂活性的提高.在所制备的催化剂中,Cu0.5Co0.5/Al2O3/FeCrAl催化剂具有最好的活性,甲苯在374℃可以完全催化燃烧消除.
이FeCrAl합금박편위기저,Al2O3장료위과도효체,불동마이비적Cu、Co위최화활성조분,제비료일계렬CuxCo1-x/Al2O3/FeCrAl(x=0-1)신형정체식최화제.채용X사선분말연사(XRD),소묘전자현미경(SEM),X광전자능보(XPS)화정서승온환원(TPR)등수단대최화제적결구진행료표정.재미형고정상반응기상평개료최화제적최화갑분연소성능.연구결과표명:재소제비적정체식최화제상,당Cu함량비교저시,형성료Cu-Co-O고용체;당Cu함량비교고시,가이측득CuO적연사봉.최화제표면과립대소화형모여Cu、Co마이비밀절상관.재최화제표면,Co이Co2+화Co3+개태존재,이Cu주요이Cu2+개태존재.최화제중적Cu가이개선Co적양화환원성,종이유리우최화제활성적제고.재소제비적최화제중,Cu0.5Co0.5/Al2O3/FeCrAl최화제구유최호적활성,갑분재374℃가이완전최화연소소제.
A series of CUxCo1-x/Al2O3/FeCrAI (x=0-1) catalysts were prepared using an FeCrAI alloy as support, a boehmite primer sol as the first washcoat layer and copper as well as cobalt oxides as the active washcoat layer. The structure of the catalysts was characterized using X-ray powder diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and temperature- programmed reduction (TPR). Toluene was chosen as the model compound to evaluate the catalytic activity in a conventional fixed-bed quartz reactor. Results indicate that a Cu-Co-O solid solution phase was present when the content of Cu in the catalysts was low and a CuO phase was present when the content of Cu was high. Both Co2+ and Co3+ were present on the surface of the obtained monolithic catalysts while Cu2+ was the main Cu species. The addition of a proper 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/FeCrAI catalyst had the best catalytic activity, and toluene was totally oxidized at 374?? over it.