CAJ | 학술논문

采用共沉淀法制各了ZrO_2,Y_(0.1)Zr_(0.9)O_x,Ce_(0.1)Zr_(0.9)O_x和Al_(0.1)Zr_(0.9)O_x系列Zr基载体,并用N_2吸附-脱附和X射线衍射对其进行了表征.再以此为载体,采用浸渍法制备了整体式负载Pd催化剂,催化剂涂层的涂覆量为180g/L左右,Pd含量为1.25%.测定了催化剂上Pd的分散度.在模拟的贫燃天然气汽车尾气中考察了催化剂的活性,并在尾气中有或无SO_2存在的条件F比较了催化剂活性的差异.结果表明,Y~(3+),Ce~(4+)或Al~(3+)改性载体负载的Pd催化剂的耐硫性能明显改善;无论尾气中是否存在SO_2,以Y~(3+)或Al~(3+)改性载体负载的Pd催化剂的活性均明显高于ZrO_2负载体的Pd催化剂.
채용공침정법제각료ZrO_2,Y_(0.1)Zr_(0.9)O_x,Ce_(0.1)Zr_(0.9)O_x화Al_(0.1)Zr_(0.9)O_x계렬Zr기재체,병용N_2흡부-탈부화X사선연사대기진행료표정.재이차위재체,채용침지법제비료정체식부재Pd최화제,최화제도층적도복량위180g/L좌우,Pd함량위1.25%.측정료최화제상Pd적분산도.재모의적빈연천연기기차미기중고찰료최화제적활성,병재미기중유혹무SO_2존재적조건F비교료최화제활성적차이.결과표명,Y~(3+),Ce~(4+)혹Al~(3+)개성재체부재적Pd최화제적내류성능명현개선;무론미기중시부존재SO_2,이Y~(3+)혹Al~(3+)개성재체부재적Pd최화제적활성균명현고우ZrO_2부재체적Pd최화제.
A series of Zr-based supports such as ZrO_2, Y_(0.1)Zr_(0.9)O_x, Ce_(0.1)Zr_(0.9)O_x, and Al_(0.1)Zr_(0.9)O_x were prepared by a co-precipitation method.The physicochemical properties of the supports were characterized by N_2 adsorption-desorption (the Brunauer-Emmet-Teller method) and X-ray powder diffraction. The Pd-based catalysts were prepared with Pd supported on these supports by the impregnation method. The Pd dispersion on the catalyst surface was characterized by CO chemisorption. The activity of the Pd-based catalysts in a simulated mixture gas from lean-burn natural gas vehicles with and without SO_2 was tested. The results indicated that ZrO_2 modified by Y~(3+), Ce~(4+) or Al~(3+) improved the resistance of the catalysts to sulphur poisoning. The modification of Pd/ZrO_2 with Y~(3+) or AI~(3+) led to more active than the Pd/ZrO_2 catalyst no matter with or without SO_2 in the simulated gas.