CAJ | 학술논문

采用浸渍法制备了Nb改性的Pd/Al2 O3催化剂，考察了该催化剂催化苯燃烧反应性能，并研究了催化剂的稳定性.结果表明， Nb的添加明显提高了Pd/Al2 O3催化剂性能，在195℃时苯转化率达到90%，苯的完全燃烧温度降低了40℃.采用X射线衍射( XRD)、X射线光电子能谱( XPS)、透射电子显微镜( TEM)、H2程序升温还原( H2-TPR)、NH3程序升温脱附( NH3-TPD)和氮气吸附等手段对催化剂进行了表征，结果表明， Nb的加入不仅提高了Pd物种的分散度，同时改变了部分Pd的价态，形成适宜反应的PdO-Pd物种，并促进了催化剂表面氧浓度的增加，使氧物种氧化能力增强，从而提高了催化性能.1%Pd-5%Nb/Al2 O3催化剂的催化活性高于2.0%Pd/Al2 O3催化剂.
채용침지법제비료Nb개성적Pd/Al2 O3최화제，고찰료해최화제최화분연소반응성능，병연구료최화제적은정성.결과표명， Nb적첨가명현제고료Pd/Al2 O3최화제성능，재195℃시분전화솔체도90%，분적완전연소온도강저료40℃.채용X사선연사( XRD)、X사선광전자능보( XPS)、투사전자현미경( TEM)、H2정서승온환원( H2-TPR)、NH3정서승온탈부( NH3-TPD)화담기흡부등수단대최화제진행료표정，결과표명， Nb적가입불부제고료Pd물충적분산도，동시개변료부분Pd적개태，형성괄의반응적PdO-Pd물충，병촉진료최화제표면양농도적증가，사양물충양화능력증강，종이제고료최화성능.1%Pd-5%Nb/Al2 O3최화제적최화활성고우2.0%Pd/Al2 O3최화제.
Pd/Al2 O3 catalyst modified by Nb promoter was prepared and tested for benzene catalytic combus-tion. The catalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, temperature-programmed desorption of NH3 , H2 temperature-programmed reduction, and N2 adsorption. The results showed that the addition of Nb effectively improved the activity and stability of Pd/Al2 O3 catalyst by increasing the dis-persion of Pd active components, changing the oxidation state of partial palladium and increasing oxygen spe-cies concentration on the surface of catalyst. In case of Pd-Nb/Al2 O3 catalyst, the benzene conversion of 90%was obtained at temperature as low as 195 ℃. Moreover, the 1%Pd-5%Nb/Al2 O3 catalyst was more active than the 2%Pd/Al2 O3 catalyst. It is concluded that Pd and Nb have a synergistic effect in benzene catalytic combustion.