钴基催化剂的制备及性能评价

以γ-Al_2O_3为载体,采用等体积浸渍法制备F-T合成钴基催化剂,在F-T合成小型固定床反应装置评价催化剂。考察并优化了钴源、焙烧温度、钴负载量、反应温度和原料气空速等工艺条件对催化荆活性和F-T合成产物收率的影响,测试了Co/γ-Al_2O_3催化剂的稳定性。结果表明,最佳制备条件:以硝酸钴为钴源,焙烧温度400℃,钴负载质量分数10%。在温度230℃、压力2 MPa、原料气组成n(H_2)∶n(CO)=2和反应空速1 800 h~(-1)的条件下,进行60 h运转实验,CO转化率可达69.1%,C_5~+烃收率高达89.6%。

Preparation and catalytic performence of cobalt-based catalysts

Cobalt-based catalysts for Fischer-Tropsch（F-T） synthesis were prepared by wet impregnation with γ-Al2O3 as the carrier. The Catalytic performances of the catalysts for F-T synthesis were studied in a fix-bed flow reactor. The influence of cobalt sources, calcination temperature, cobalt loadings, reaction temperature and feed gas space velocity on the catalytic activity of Co/γ-Al2O3catalysts and the yields of F-T synthesis products were investigated. The stability of Co/γ-Al2O3eatalyst was also studied. The results indicated that the optimum preparation condition was as follows： cobalt nitrate as the precursors, calcination temperature 400 % and cobalt loading 10% （mass fraction）. CO conversion of 69.1% and the yield of C5＋ hydrocarbon of 89.6% were attained, respectively, under the reaction condition of reaction temperature 230 ℃ ,reaction pressure 2 MPa, space velocity 1 800 h-1, n（ H2） ： n（CO） = 2 and running for 60 h.