摘要: Conversion of saturated straight-chain alkanes generated in the deep desulfurization process of fluid catalytic cracking (FCC) gasoline and the coal-to-oil processes into aromatics via alkane aromatization is an important non-petroleum route for the preparation of aromatics that effectively improves the quality of oil. The aromatization technology of C2−C5 light hydrocarbons is relatively mature and has been used in industry. However, for the aromatization of ${\rm{C}}_6^+ $n-alkanes, the aromatics yield is still very low due to the complex reaction process and the competition of various elemental reactions. In addition, the catalysts usually suffer from rapid deactivation. In this work, we summarize the recent advances in the aromatization of ${\rm{C}}_6^+ $n-alkanes. The reaction mechanism of aromatization of ${\rm{C}}_6^+ $ alkanes and the effects of the dispersion of metal sites, electronic state, and acidity, morphology and pore structure of the support on the catalytic performance are discussed in detail.
摘要: 电化学二氧化碳还原（Electrocatalytic CO2 Reduction，ECR）能够实现可再生能源的存储和利用，并将CO2转化为高值化学品，是“双碳”背景下重要的能源利用方式，经济和环境效益显著。高效催化剂是ECR过程的核心。单原子催化剂因具有理论上100%的活性组分原子利用率，是理想的ECR催化剂之一。炭材料兼具高比表面积和优异导电性等优点，是电催化的理想载体。本工作根据单原子活性中心与炭载体作用方式的不同进行分类，综述了近十年代表性炭材料负载的单原子催化剂制备、结构、性能以及在ECR反应过程中的作用机制，期望能够为相关领域的研究提供思路和借鉴。
摘要: Shifting products of Fischer-Tropsch Synthesis (FTS) from paraffins to value-added higher alcohols receives great attention but remains great challenge. Herein, metal oxides of Mn, Zn, La and Zr are investigated as promoters to tune the activity and product distributions of Co/AC catalyst for syngas conversion. It is found that these promoters show different promotion effect on CO dissociation rate, the formation of Co2C phase and the alcohols selectivity. The formed Co2C/Co0 constitutes the dual active site for higher alcohols synthesis. The strongest CO dissociation rate is observed for Zn-promoted Co/AC catalyst, resulting in the highest activity and space-time yield (STY) of alcohols. The Mn promoter is most conducive to the formation of Co2C, but slightly decreases the activity. The similar CO dissociation rate and CO conversion are obtained over both Zr- and La-promoted Co/AC catalysts, but the Zr-promoted Co/AC catalyst exhibits the highest alcohols selectivity due to the function balance between CO non-dissociative insertion and CO dissociation.
