CAJ | 학술논문

分别以锐钛矿相TiO2和金红石相TiO2为载体,采用等体积浸渍法制备了Ni/TiO2催化剂,考察了其催化顺酐液相加氢性能。采用氮气吸附-脱附、氢气程序升温还原( H2-TPR)、 X射线衍射( XRD)、氢气程序升温脱附( H2-TPD)及X射线光电子能谱( XPS)等技术对催化剂进行了表征。催化剂评价结果表明,以锐钛矿型TiO2为载体催化剂的C O加氢活性明显高于以金红石型TiO2为载体的催化剂。这主要是由于在还原过程中锐钛矿型TiO2较易被还原,产生了较高浓度的氧缺陷位,该氧缺陷位可通过接受C O中O的孤对电子来活化C O,促使其与H2发生加氢反应,进而使催化剂表现出较高的C O加氢活性。
분별이예태광상TiO2화금홍석상TiO2위재체,채용등체적침지법제비료Ni/TiO2최화제,고찰료기최화순항액상가경성능。채용담기흡부-탈부、경기정서승온환원( H2-TPR)、 X사선연사( XRD)、경기정서승온탈부( H2-TPD)급X사선광전자능보( XPS)등기술대최화제진행료표정。최화제평개결과표명,이예태광형TiO2위재체최화제적C O가경활성명현고우이금홍석형TiO2위재체적최화제。저주요시유우재환원과정중예태광형TiO2교역피환원,산생료교고농도적양결함위,해양결함위가통과접수C O중O적고대전자래활화C O,촉사기여H2발생가경반응,진이사최화제표현출교고적C O가경활성。
Ni/TiO2 catalysts with anatase and rutile titania as supports were prepared via the incipient impreg-nation method and were applied in the liquid phase hydrogenation of maleic anhydride. All catalysts were characterized by N2 physical adsorption-desorption, H2-temperature programmed reduction(H2-TPR), X-ray diffraction(XRD), H2-temperature programmed desorption(H2-TPD) and X-ray photoelectron spectroscopy ( XPS) . The evaluation results show that the activity of CO hydrogenation of catalyst with anatase TiO2 as support was significantly higher than that with rutile TiO2 as support. The higher activity of CO hydrogena-tion was attributed to a higher concentration of the oxygen vacancies produced during the reduction process. Oxygen vacancies could promote the hydrogenation of CO group by accepting lone pair of electrons of oxy-gen in CO group.