摘要
以活性炭(AC)为模板剂通过浸渍法引入铈源,通过高温焙烧制得纳米Ce O2催化剂。在催化二氧化碳和甲醇直接合成碳酸二甲酯(DMC)的反应中,该催化剂表现出优越的催化活性,当Ce O2与活性炭的物质的量比为3∶7(Ce O2/AC≈0.43)时,碳酸二甲酯收率最高,达到0.893 1 mmol/mmolcat。此外,通过X-射线衍射(XRD)、红外光谱(IR)、透射电镜(TEM)和程序升温吸附(TPD)对所制备的催化剂进行了表征。研究结果表明,焙烧过程中,催化剂前驱体中活性炭的去除过程能够有效地调节催化剂表面的酸碱位,适量的中强酸性位和中强碱性位是影响Ce O2催化活性的重要因素。
Nano-Ce O2 particles were obtained via high temperature calcination to activated carbon supported cerium nitrate precursor,which was prepared using a impregnation method,and used for synthesis of DMC from methanol and CO2. Based on results,the nano-Ce O2 particles showed relatively high catalytic performance. The DMC yield of 0. 893 1 mmol / mmolcatcould be obtained with the Ce O2/ AC ratio of 3∶ 7（ ≈0. 43）. The catalysts were fully characterized by XRD,IR,TEM and TPD techniques. The results showed that the removal step of AC in precursor could effectively adjust the surface acidity and basicity of the catalysts during calcination,and moderate mediate strong acid and mediate strong alkaline had a significant effect on the catalytic performance of nano-Ce O2.
出处
《化学试剂》
CAS
北大核心
2015年第9期834-838,842,共6页
Chemical Reagents
基金
中国科学院煤炭化学研究所重点实验室开放基金资助项目(J13-14-902)
