等离子体协同Co/ZSM-5催化CO2加氢制低碳烃

采用浸渍法制备了负载型Co基催化剂，并在介质阻挡放电低温等离子体反应器中研究了其对CO₂加氢转化生成低碳烃反应的催化性能，考察了载体、Co负载量，以及催化助剂对催化剂性能的影响，探讨了催化剂活性相、等离子体与催化剂的协同作用机理，分析了在等离子体体系中CO₂加氢制低碳烃可能的反应路径。结果表明，在介质阻挡放电反应器中，等离子体与Co基催化剂具有显著协同作用，在常压、低温下，CO₂加氢可生成一定量的C₂~C₄低碳烃。以Co质量分数为15%的Co/ZSM-5为催化剂时，CO₂转化率达45.0%；C₂~C₄选择性为13.7%。催化助剂Ni的加入可以进一步提高CO2的转化率和C2~C4的选择性。当Ni-Co/ZSM-5催化剂中m(Co)/m(Ni)为4∶1时，C₂~C₄转化率达52.3%，C₂~C₄选择性达17.9%。

Application of Co/ZSM-5 Catalyst and Non-Thermal Plasma on CO2 Hydrogenation to Light Hydrocarbons

Supported Co catalysts were synthesized by incipient-wetness impregnation method, and their catalytic performance for CO₂ hydrogenation to light hydrocarbons with the synergy of plasma was evaluated in a dielectric-barrier discharges (DBD) reactor. Effects of carriers, metal loading amounts and co-catalyst on the catalytic performance were investigated. Furthermore, the synergic effects among active phase of cobalt catalyst, plasma and catalysis were studied, and the reaction network of CO₂ hydrogenation in a DBD reactor was proposed. In the DBD reactor, significant synergetic effect was observed between non-thermal plasma and cobalt catalysts for CO₂ hydrogenation to light hydrocarbons, and this makes it possible to hydrogenate CO₂ at a low temperature and atmospheric pressure. For Co/ZSM-5 with 15% mass fraction cobalt，the total selectivity of C₂-C₄ hydrocarbons was 13.7% with a CO₂ conversion 45.0%. Addition of Ni as a promoter led to obvious improvement in both CO₂ conversion and C₂-C₄ selectivity. At the optimal mass ratio of Co to Ni (4∶1), CO₂ conversion can be 52.3%, and the selectivity of C₂-C₄ hydrocarbons is 17.9%.