浸渍沉淀法制备活性炭负载Co-Mo双金属脱硫催化剂

以氧化改性活性炭为载体,尿素为沉淀剂,采用浸渍沉淀法制备了负载型Co-Mo催化剂,并用CO还原SO₂反应作为模型反应考察了催化剂的催化活性。结果表明,催化剂焙烧温度500℃、Co/Mo物质的量比0.45、最佳反应条件(硫化温度为500℃、空速为7 000 mL/(g·h)、CO/SO₂物质的量比为2:1,反应温度为450℃)时,催化剂具有最好的催化活性和选择性。XRD表征结果表明,催化CO还原SO₂反应的活性相为CoS₂和MoS₂,硫化温度影响活性相的形成。该催化剂稳定性好,反应运行24 h后活性仍能保持最高活性的99%。

Preparation of activated carbon-supported Co-Mo bimetallic catalyst by impregnation-precipitation method

Supported Co-Mo catalyst was prepared by impregnation-precipitation method using modified activated carbon as carrier and urea as precipitant.Catalytic activity of catalyst was studied by using the reduction of SO₂ by CO.Under optimum reaction conditions (sulfidation temperature 500℃; GHSV=7 000 mL·g^-1·h^-1;CO/SO₂ mol ratio =2:1; reaction temperature 450℃), the best catalytic activity and selectivity were obtained for Co-Mo catalyst with calcination temperature was 500℃ and Co/Mo mol ratio =0.45. Catalyst samples were characterized by X-ray powder diffraction (XRD) in order to relate the phase composition to the activation behavior and catalytic performance.The active phases of catalyst were detected as CoS₂ and MoS₂,and the formation of them were greatly dependent on the sulfidation temperature.And the catalytic activity of cobalt molybdenum catalyst decreased less than 1% after the reaction lasted for 24 h.