Ni-Cu双金属催化剂对蓖麻油催化加氢的性能研究

Study on the Performance of Ni-Cu Bimetallic Catalyst for Catalytic Hydrogenation of Castor Oil

采用共沉淀法制备了一系列负载型镍铜双金属催化剂,并将其应用于蓖麻油加氢反应。考察了不同金属摩尔比、催化剂制备条件、反应温度、反应压力对蓖麻油氢化反应的影响。结果表明,在以SD-Ⅱ膨润土为载体,金属硝酸盐为反应物,镍铜摩尔比为2.5:1的条件下,制备的催化剂活性和选择性最佳。同时,在H2压力为2 MPa,反应温度为160℃条件下,反应1 h后产品氢化蓖麻油的碘值可以达到3.5 g/100 g左右、羟值达到158.9 mg/g左右,均达到国家标准的指标参数要求。该催化剂在循环使用5次后,仍未发现明显失活。实验结果表明,这种低成本、性能稳定的双金属催化剂可用于氢化蓖麻油工业化生产及连续工艺的开发。

A series of supported nickel-copper bimetallic catalysts were prepared by co-precipitation and applied to the hydrogenation of castor oil.The effects of different metal molar ratios,catalyst preparation conditions,reaction temperature and reaction pressure on the hydrogenation of castor oil were investigated.The results showed that the catalyst had the best activity and selectivity under the conditions of SD-II.bentonite as the carrier,metal nitrate as the reactant,and the molar ratio of nickel-copper was 2.5:1.At the same time,under the condition of H2 pressure of 2 MPa and reaction temperature of 160℃,the iodine value of hydrogenated castor oil of the product could reach 3.5 g/100 g and the hydroxyl value of 158.9 mg/g after 1 h of reaction,which met the requirements of the national standard index parameters.After 5 cycles,no significant inactivation was found.The experimental results show that this low-cost and stable bimetallic catalyst can be used for the industrial production of hydrogenated castor oil and the development of continuous process.