CAJ | 학술논문

采用浸渍法和共沉淀法制备了一系列不同Cu含量的超顺磁CuO-Bi2O3/Fe3O4-SiO2-MgO催化剂。使用电感耦合等离子体发射光谱仪（ICP-AES）、低温N2物理吸-脱附、X射线衍射（XRD）、H2程序升温还原（H2-TPR）、振动样品磁强计（VSM）对催化剂的组成、结构、织构及磁性能进行表征，评价了该催化剂催化甲醛乙炔化合成1,4-丁炔二醇的催化活性。结果表明，制备方法对催化剂中活性组分CuO的存在状态及炔化性能有较大影响，采用共沉淀法较浸渍法制备的催化剂具有更高的比表面积、CuO分散度与较好的还原能力，表现出较高的炔化性能；Cu含量是影响催化剂炔化性能的另一重要因素，随Cu含量的增加，催化剂活性逐渐增加，在本研究考察范围内，以共沉淀法制备的Cu质量分数为30%的催化剂表现出最佳的甲醛乙炔化性能。同时，该催化剂具有良好的超顺磁性，可以在外加磁场的作用下迅速分离回收，循环使用6次后，其催化活性明显高于非磁性催化剂。
채용침지법화공침정법제비료일계렬불동Cu함량적초순자CuO-Bi2O3/Fe3O4-SiO2-MgO최화제。사용전감우합등리자체발사광보의（ICP-AES）、저온N2물리흡-탈부、X사선연사（XRD）、H2정서승온환원（H2-TPR）、진동양품자강계（VSM）대최화제적조성、결구、직구급자성능진행표정，평개료해최화제최화갑철을결화합성1,4-정결이순적최화활성。결과표명，제비방법대최화제중활성조분CuO적존재상태급결화성능유교대영향，채용공침정법교침지법제비적최화제구유경고적비표면적、CuO분산도여교호적환원능력，표현출교고적결화성능；Cu함량시영향최화제결화성능적령일중요인소，수Cu함량적증가，최화제활성축점증가，재본연구고찰범위내，이공침정법제비적Cu질량분수위30%적최화제표현출최가적갑철을결화성능。동시，해최화제구유량호적초순자성，가이재외가자장적작용하신속분리회수，순배사용6차후，기최화활성명현고우비자성최화제。
Magnetic CuO-Bi2O3/Fe3O4-SiO2-MgO catalysts with different Cu content were prepared by using impregnation and coprecipitation methods. The obtained catalysts were characterized by atomic emission spectrometer (ICP-AES), N2 absorption, X-ray diffraction (XRD), H2 temperature-programmed reduction (H2-TPR) and vibrating sample magnetometer (VSM). Their catalytic performance for formaldehyde ethynylation was evaluated. The results indicated that preparation method showed a great influence on the CuO station in catalysts,thus,on the performance for formaldehyde ethynylation reaction. Compared with the catalysts prepared by impregnation, the CuO-Bi2O3/Fe3O4-SiO2-MgO catalysts prepared by co-precipitation method showed higher CuO dispersion and better reducibility, so had better catalytic activity and selectivity. Moreover, Cu content was another important factor affecting catalyst activity. With Cu content increasing, the catalyst activity increased gradually. In the present work,30%(mass) Cu loading catalyst prepared by co-precipitation method showed the highest catalytic activity. In addition, this catalyst was of good superparamagnetism and stability, so easy separated by external magnetic field for reuse. After six cycles, its stability was much better than non-paramagnetism CuO-Bi2O3/SiO2-MgO catalyst.