CAJ | 학술논문

采用胶溶法制备了一系列碱土金属改性的ZrO2-Al2O3,并以其为载体采用等体积浸渍法制备了Pd-Rh密偶催化剂.采用低温N2吸附一脱附、X射线衍射(XRD)、氨气程序升温脱附(NH3-TPD)对载体样品进行了表征.结果表明,碱土金属的添加增大了ZrO2-Al2O3的比表面积,Sr-zr-Al样品经1000℃焙烧5 h后具有最大的比表面积,为164 m2 ·g-1.对催化剂进行了H2程序升温还原(H2-TPR)、X射线光电子能谱(XPS)和活性表征,考察了催化剂对C3H8的转化活性.测试结果表明,添加碱土金属能有效提高催化剂上丙烷的转化活性.
채용효용법제비료일계렬감토금속개성적ZrO2-Al2O3,병이기위재체채용등체적침지법제비료Pd-Rh밀우최화제.채용저온N2흡부일탈부、X사선연사(XRD)、안기정서승온탈부(NH3-TPD)대재체양품진행료표정.결과표명,감토금속적첨가증대료ZrO2-Al2O3적비표면적,Sr-zr-Al양품경1000℃배소5 h후구유최대적비표면적,위164 m2 ·g-1.대최화제진행료H2정서승온환원(H2-TPR)、X사선광전자능보(XPS)화활성표정,고찰료최화제대C3H8적전화활성.측시결과표명,첨가감토금속능유효제고최화제상병완적전화활성.
A series of alumina supports stabilized by alkaline earth metals and zirconia were prepared by the peptizing method.Pd-Rh close-coupled catalysts supported on modified alumina were prepared by the impregnation method.The supports were characterized by low temperature nitrogen adsorption-desorption method,X-ray diffraction(XRD).and NH3-temperature programmed desorption(NH3-TPD).For the catalysts.H2-temperature programmed reduction(H2-TPR)and×-ray photoelectron spectroscopy(XPS)were carried out.We also Carried out catalytic activity tests for C3H8 conversion.Results show that the addition of alkaline earth metals jncreases the surface area of the supports and the surface area of Sr-Zr-Al reaches 164 m2·g-1after calcination at 1000℃ for 5 h.The introduction of alkaline earth metals into the ZrO2-Al2O3 supports also improves their catalytic activity toward propane oxidation and the activities of the Pd-Rh catalysts containing alkaline earth metals are higher than that of the catalyst prepared with a ZrO2-Al2O3 support.