Raney-Ni催化中和生物油加氢制取饱和醇的研究

INVESTIGATION ON CATALYTIC HYDROGENATION OF NEUTRALIZED BIO-OIL TO PRODUCE SATURATED ALCOHOL OVER RANEY-NI CATALYST

针对生物油中酸含量高、易腐蚀反应器、加氢反应催化剂易中毒等问题,首先采用碳酸盐(Na_2CO_3、CaCO_3)中和的方法对生物油进行预处理,研究Raney-Ni催化剂上预处理后的生物油催化加氢提质特性。采用N_2吸附脱附、XRD等技术对自制Raney-Ni进行表征。预处理生物油催化加氢结果表明:生物油酸含量明显降低,Na_2CO_3中和后的生物油酸含量由原油的42.19%降低至6.86%;经加氢反应后,饱和醇选择性可达90.02%。但经碳酸盐中和的生物油催化加氢产物稳定性差,金属离子的残留导致改质后生物油灰分增大。

High acid content in bio-oil is easy to corrode the reactor, and the catalyst is easy to be poisoned in hydrogenation process. The bio-oil was pretreated by neutralization methods using Na2CO3 or CaCO3. After Raney-Ni catalyst pretreatment, the performance improvement of bio-oil through catalytic hydrogenation was investigated. The Reney-Ni catalyst was characterized by N2 adsorption-desorption, XRD and BET techniques. The results show that after neutralization and catalytic hydrogenation, the acid content of bio-oil is decreased from 42.19% to 6.86%; and alcohol selectivity reaches up to 90.02% after catalytic hydrogenation. However, after Na2C03 neutralization and hydrogenation, the bio-oil product is unstable. Remained metal ions lead to increasing ash content in bio-oil. saturated catalytic