CAJ | 학술논문

采用柠檬酸络合法制备了Co/CeO2及其钙掺杂系列催化剂,并对催化剂进行了低温N2物理吸附、X射线衍射、H2程序升温还原、傅里叶变换红外光谱、高分辨透射电镜表征以及乙醇水蒸气重整催化性能测试.结果表明,所制Co/CeO2催化剂具有良好的乙醇水蒸气重整催化性能,500℃时乙醇能全部转化为C1,氢气产率高达85％以上.Ca掺杂减小了载体CeO2纳米颗粒尺寸,但对还原后Co0尺寸的影响较小.当Ca掺杂量大于5.0％时,催化剂氧化还原性能和乙醇水蒸气重整催化性能下降.较高的还原温度有利于体相Ce4+还原为Ce3+,并且提高了催化活性,认为金属-氧化物边界的增加提高了催化活性.初步稳定性考察结果表明,5％钙掺杂后的催化剂具有更好的抗积炭性能.
채용저몽산락합법제비료Co/CeO2급기개참잡계렬최화제,병대최화제진행료저온N2물리흡부、X사선연사、H2정서승온환원、부리협변환홍외광보、고분변투사전경표정이급을순수증기중정최화성능측시.결과표명,소제Co/CeO2최화제구유량호적을순수증기중정최화성능,500℃시을순능전부전화위C1,경기산솔고체85％이상.Ca참잡감소료재체CeO2납미과립척촌,단대환원후Co0척촌적영향교소.당Ca참잡량대우5.0％시,최화제양화환원성능화을순수증기중정최화성능하강.교고적환원온도유리우체상Ce4+환원위Ce3+,병차제고료최화활성,인위금속-양화물변계적증가제고료최화활성.초보은정성고찰결과표명,5％개참잡후적최화제구유경호적항적탄성능.
Co/CeO2 catalysts with and without calcium doping were prepared by the citric acid complexing method,and characterized by N2 adsorption,X-ray diffraction,temperature-programmed reduction,Fourier transform infrared spectroscopy,and high resolution transmission electron microscope.Their catalytic performance measurement for ethanol steam reforming (ESR) at 400-650 ℃ and atmospheric pressure with a steam-to-carbon ratio of 3.0 and gas hourly space velocity of 50000 ml/(g·h) was measured.The citric acid complexing method enhanced metal-support interaction.The Co/CeO2 catalysts gave almost 100％ ethanol conversion and good hydrogen yield at 500 ℃.Calcium doping in the catalyst reduced the particle size of CeO2,but had little effect on the metallic cobalt size after reduction.Calcium doping higher than 5％ deteriorated the redox properties and ESR catalytic performance,which was attributed to the fouling of CeO2 by CaO.Catalysts activated at 650 ℃ showed a better performance,which was due to a higher reduction degree of ceria and increase of the metal-oxide interface.Stability investigation of the catalysts suggested that 5％ calcium doping enhanced carbon deposition resistance.