Ni_2P/Zr-MCM-41催化剂的制备及其对麻风树油加氢脱氧的催化性能

Preparation of Ni_2P/Zr-MCM-41 catalyst and its performance in the hydrodeoxygenation of Jatropha curcas oil

采用水热法合成MCM-41和Zr-MCM-41,由Ni（NO_3）_2和（NH_4）2HPO_4溶液共浸渍、高温焙烧、氢气还原和钝化制备了负载型Ni_2P/Zr-M CM-41催化剂。采用XRD、TEM、氮气吸附、CO吸附、吡啶吸附红外和XPS等方法对催化剂进行了表征,并在高压反应釜中研究了其对麻风树油加氢脱氧（HDO）的催化性能。结果表明,氢气还原温度为650℃、Ni2P负载量为20%（质量分数）、Ni2P物相呈晶型时,Ni_2P/Zr-M CM-41催化剂的活性最佳;较低的Ni2P负载量有利于其在Zr-M CM-41载体表面均匀分散,而负载量高于25%（质量分数）时,活性组分少量团聚,易导致孔道堵塞。催化剂表面存在部分因钝化而形成的Ni O。对于麻风树油加氢脱氧,Ni2P负载量为20%（质量分数）Ni_2P/Zr-M CM-41表现出优异的催化性能;脱氧率高达93.90%,直链烷烃含量高达85.36%,其中柴油组分产率较高,C15~20组分占直连烷烃组分50%以上。

With hydrothermally synthesized MCM-41 and Zr-MCM-41 as the supports,Ni_2P / Zr-MCM-41 catalysts were prepared by co-impregnation with Ni（ NO3）2and（ NH4）2HPO4solution,calcination,reduction with H2 and subsequent passivation. The Ni_2P / Zr-MCM-41 catalysts were characterized by XRD,Py-IR,TEM,XPS,N2 physisorption and CO chemisorption; their catalytic performance in the hydrodeoxygenation（ HDO） of Jatropha curcas oil to produce the second-generation biodiesel was investigated in an autoclave. The results indicated that Ni_2P can be well dispersed on Zr-MCM-41 with a loading of 20% by reduction at 650 ℃ from the phosphate precursors. The Ni_2P / Zr-MCM-41 catalyst exhibit excellent performance in the HDO of Jatropha curcas oil. Over the Ni_2P / Zr-MCM-41 catalyst with a Ni_2P loading of 20%,the HDO conversion achieves93. 90% and the fraction of linear paraffins in the product oil reaches 85. 36%,in which diesel fraction（ C15 ~ 20）may exceed 61. 90%; the components of oil generated through HDO are similar to those of fossil diesel.