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

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。

Preparation of Ni2P/Zr-MCM-41 catalyst and its performance in the hydrodeoxygenation of Jatropha curcas oil

With hydrothermally synthesized MCM-41 and Zr-MCM-41 as the supports, Ni₂P/Zr-MCM-41 catalysts were prepared by co-impregnation with Ni(NO₃)₂ and (NH₄)₂HPO₄ solution, calcination, reduction with H₂ and subsequent passivation. The Ni₂P/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 Ni₂P can be well dispersed on Zr-MCM-41 with a loading of 20% by reduction at 650 ℃ from the phosphate precursors. The Ni₂P/Zr-MCM-41 catalyst exhibit excellent performance in the HDO of Jatropha curcas oil. Over the Ni₂P/Zr-MCM-41 catalyst with a Ni₂P loading of 20%, the HDO conversion achieves 93.90% and the fraction of linear paraffins in the product oil reaches 85.36%, in which diesel fraction (C_15~20) may exceed 61.90%; the components of oil generated through HDO are similar to those of fossil diesel.