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首页> 外文期刊>RSC Advances >Catalytic properties of nickel/sepiolite promoted with potassium and lanthanum in adiponitrile hydrogenation under mild conditions
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Catalytic properties of nickel/sepiolite promoted with potassium and lanthanum in adiponitrile hydrogenation under mild conditions

机译：钾和镧促进的镍/海泡石在温和条件下在己二腈加氢中的催化性能

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摘要

Ni/sepiolite, potassium and (or) lanthanum doped Ni/sepiolite catalysts were prepared by the incipient impregnation method and characterized by N-2 adsorption-desorption, temperature programmed reduction (TPR), hydrogen chemisorption, powder X-ray diffraction (XRD), ammonia temperature programmed desorption (NH3-TPD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). It was revealed that the potassium could inhibit the formation of the ACH by-product by neutralizing some acid sites on the catalyst, and the lanthanum could efficiently reduce the diameter and improve the dispersion of the active nickel particles. These catalysts were tested in liquid phase hydrogenation of adiponitrile (ADN). The products include 6-aminocapronitrile (ACN), hexamethylenediamine (HMDA), 1-azacycloheptane (ACH) and C-12 compounds. It shows that the catalyst doped with potassium and lanthanum gives the best catalytic performance, the selectivity to ACN and HMDA reaches to 91.32% at 92.56% conversion of adiponitrile under 393 K and 2.0 MPa.
机译：采用初始浸渍法制备了Ni /海泡石，钾和（或）镧掺杂的Ni /海泡石催化剂，并通过N-2吸附-解吸，程序升温还原（TPR），氢化学吸附，粉末X射线衍射（XRD）进行了表征。 ，氨温度程序解吸（NH3-TPD），透射电子显微镜（TEM）和扫描电子显微镜（SEM）。结果表明，钾可通过中和催化剂上的某些酸位而抑制ACH副产物的形成，而镧可有效减小直径并改善活性镍颗粒的分散性。在己二腈（ADN）的液相加氢中测试了这些催化剂。产品包括6-氨基己腈（ACN），六亚甲基二胺（HMDA），1-氮杂环庚烷（ACH）和C-12化合物。结果表明，在393 K和2.0 MPa条件下，己二腈转化率为92.56％时，掺杂钾和镧的催化剂具有最佳的催化性能，对ACN和HMDA的选择性达到91.32％。

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