耐硫甲烷化催化剂的研究

煤制天然气采用耐硫甲烷化催化剂,减小了反应设备体积,对节省投资和降低能耗有积极意义。采用等体积浸渍法制备系列Mo-Ni/γ-Al2O3耐硫甲烷化催化剂,并对催化剂活性及耐硫性进行评价,考察浸渍液中不同Co和W元素添加量对催化剂活性的影响。结果表明,耐硫甲烷化催化剂活性中心MoS2和WS2的生成有利于提高CO转化率和CH4选择性,促进合成气生成CH4,Co的添加不利于提高催化剂的CO转化率和CH4选择性,而W元素的添加有利于提高催化剂的CO转化率和CH4选择性。在反应温度550℃、压力2 MPa和空速1 800 h-1条件下,n（H2）∶n（CO）=1∶1时,CO转化率为64.24%,CH4选择性为52.00%。n（H2）∶n（CO）=3∶1时,CO转化率为77.90%,CH4选择性为68.41%。

Research on sulfur-resistant methanation catalysts

Adopting sulfur-resistant methanation catalyst for synthetic natural gas （SNG）can greatly decrease the volume of the reaction equipment, save investment and reduce energy consumption. A series of Mo-Ni/γ-Al2O3 sulfur-resistant methanation catalysts was prepared by equivalent-volume impregnation method. The activity and sulfur-resistance of the catalysts, and the effect of different Co or W contents of the impregnation liquid on catalyst activity were investigated. The results showed that active centres MoS2 or WS2 of sulfur-resistant methanation catalyst helped to improve the conversion of CO and the selectivity to CH4,and promoted the synthetic gas to produce methane;the addition of Co was not beneficial to the enhancement of CO conversion and the selectivity to CH4, and the addition of W was in favor of the increase of CO conversion and the selectivity to CH4. CO conversion of 64.24% and the selectivity to CH4 of 52.00% were attained under the condition as follows：reaction temperature 550 ~C, reaction pressure 2 MPa, space velocity 1 800 h-1 ,and n（H2 ） ： n（CO） = 1 ： 1 ;when n （ H2 ） ： n（CO） = 3：1 and other condition kept the same, the conversion of CO reached 77.90% ,and the selectivity to CH4 was 68.41%.