以硝酸钯[Pd(NO₃)₂]、氯钯酸[H₂PdCl₆]、二硝基四氨合钯[Pd(NH₃)₄(NO₃)₂]为浸渍液制备了Pd/SAPO-31双功能催化剂,考察了钯盐前驱体对生物柴油加氢异构性能的影响。利用N₂物理吸附、NH₃-TPD、Py-IR和H₂化学吸附等对催化剂进行表征。结果表明,最适宜的钯前驱体为硝酸钯[Pd(NO₃)₂]。在固定床反应器中进行正十六烷的异构化反应的最佳条件为:催化剂用量为200 mL、压力为2.0 MPa、反应温度为350℃、空速为1.5、氢油比为500:1,此时,正十六烷的转化率最高可达85%以上。当凝固点为0℃、闪点为60℃、十六烷值为74时,生物柴油的产率最高,为92.2%。

Pd/SAPO-31 bifunctional catalysts are prepared by using palladium nitrate (Pd(NO₃)₂),ammonium chloroplatinate (H₂PdCl₆),and tetraamminepalladium dinitrate (Pd(NH₃)₄(NO₃)₂) solution respectively as impregnating agent.The effects of palladium-based precursors on the performance of the catalysts in hydroisomerism of biodiesel are investigated.The catalysts are also characterized by means of N₂ sorption-desorption,NH₃-TPd,Py-IR and H₂ chemical adsorption.It is indicated that palladium nitrate is the most suitable precursor.The optimal conditions for the isomerization of n-hexadecane in a fixed-bed reactor are as follows:the dosage of the catalyst is 200 mL,the pressure is 2.0 MPa,the reaction temperature is at 350℃,WHSV is 1.5,and hydrogen/oil ratio is 500:1,under which the highest conversion of n-hexadecane can exceed 85%.The yield of biodiesel reaches the highest,92.2% whten the solidifying point is 0℃,flash point is 60℃ and cetane number is 74.

贾云刚(1975-),男,硕士,高级工程师,主要从事生物柴油加氢脱氧、加氢异构催化剂及载体材料的研究与开发工作,jiayg459@petrochina.com.cn