NG石墨烯文献汇总.pptxVIP

Chen X, Bao X, et al. N-doped graphene as an electron donor of iron catalysts for CO hydrogenation to light olefins[J]. Chemical Communications, 2015, 51(1): 217-220.（IF = 6.834）;·合成气制低碳烯烃的重要意义 ·费托合成制低碳烯烃的缺点: ASF分布； ·采用铁基催化剂制低碳烯烃时的特点: 低成本；能有效提高低碳烯烃的选择性； 对载体和助剂的电子特性很敏感；;“……carbon material have attached great attention as the potential candidate because of their unique structural and electronic properties……” ·将铁限制在碳纳米管内与铁负载在碳纳米管表面对费托合成的产物选择性有很大的影响;（electronic environment) ·石墨烯被用作载体；优点是比表面积大，具有特殊的电子效应。缺点是纯的石墨烯呈化学惰性 ;文章的结构;文章的思路;Fe/NG的制备;ICP-OES:确认了催化剂中铁的负载量约为8% TEMHRTEM：Fe/NG催化剂和NG一样保持了纳米薄片结构,这样的结构使得纳米粒子充分分散 XRD:分散的纳米粒子为Fe2O3相 XPS:表征了氮元素的掺杂水平和C-N键构型。合成的NG 的氮含量有 4.5%,8.4%, 16.4% (N/C)三类 The Ranman spectra:表明了氮元素掺杂入石墨烯 ;定量了各催化剂样品上铁的担载量;反应前催化剂上的分散相为Fe2O3相 ； N的掺入使得铁粒子更好的分散 ;Fe/NG催化剂的形态和结构;实验部分;Table S3. The catalytic performance of Fe/NG samples for CO hydrogenation. ;Table S4. The catalytic performance of Fe/XC and Fe/XC-N for CO hydrogenation.;Table S1. Composition of NG samples, XC-72 and XC-N estimated by XPS.;Fig. 2 The performance of CO hydrogenation to light olefins by Fe/NG catalysts. The product distribution of CO hydrogenation by Fe/NG4.5 (a)Fe/NG8.4 (b) and Fe/NG16.4 (c) at various reaction temperature andpressure. (d) C2=–C4= selectivity of Fe/XC, Fe/XC–N and Fe/NG16.4 atvarious reaction temperature and pressure. Reaction condition: 100 mg catalyst, Fe loading = 8 wt%, GHSV = 5000 h-1, H2 :CO = 1 : 1.;随着空速降低，CO的转化率有显著的增加，低碳烯烃的选择性仍保持较高水平;XAS:反应前Fe/NG与Fe/XC样品均形成Fe2O3； N使NG上的电子转移给Fe XANES：Fe/NG催化剂和NG一样保持了纳米薄片结构,这样的结构使得纳米粒子充分分散 XRD（反应后）：与Fe/XC催化剂相比Fe/NG催化剂???更多还原过的铁；反应后Fe/NG催化剂中铁主要呈低价态Fe7C3和H?gg Fe5C2;Normalized XAS of Fe L-edge of original Fe/NG and Fe/XC samples measured in a total electron yield (TEY) mode. The samples was treated in Ar at 350 °C for 1 h before XAS tests.;XRD patterns of Fe/NG and Fe/XC samples after reaction. ;Normalized XANES spectra of Fe K-edge of Fe/NG and Fe/XC samples after reaction compared wit