高分散纳米Y型分子筛负载Ni_2P催化剂的制备及其加氢脱硫性能

Preparation of Highly Dispersed Nickel Phosphide Catalyst Supported on Nano-Sized Y Zeolite and Its Hydrodesulfurization Performance

以无模板剂法合成的纳米Y型分子筛(35 nm左右)为载体,采用低温还原法制备了高分散Ni_2P/NY催化剂,同时制备了普通Y型分子筛担载的Ni_2P/Y催化剂作为对比。采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)和X射线光电子能谱(XPS)等手段对载体和催化剂进行了表征,并在固定床反应器中考察了不同催化剂对4,6-二甲基二苯并噻吩(4,6-DMDBT)的加氢脱硫反应性能。结果表明,该催化剂的高活性来自纳米Y型分子筛上Ni_2P分散度的提高和高活性中心的暴露。在反应温度为340℃,反应压力为3.0 MPa的条件下,以Ni_2P/NY为催化剂,4,6-DMDBT的转化率达到了96.0%,高于CoMoS/Al_2O_3商业催化剂(77.2%)和Ni_2P/Y催化剂(67.0%)。

The highly dispersed Ni2P/NY catalyst was prepared by low temperature reduction method using nano-sized Y zeolite(35nm or so)as support synthesized by template-free method,and the Ni2P/Y catalyst supported by ordinary Y zeolite was prepared.The zeolites and catalysts were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).The effects and performances of different catalysts on the HDS reaction of4,6-dimethyldibenzothiophene(4,6-DMDBT)were investigated in a fixed-bed reactor.The results showed that the conversion of Ni2P/NY catalyst for the HDS reaction of4,6-DMDBT reached96.0%under the reaction conditions of temperature340℃,reaction pressure3.0MPa,which was higher than that of commercial CoMoS/Al2O3catalyst(77.2%)and Ni2P/Y catalyst(67.0%).The high activity of the catalyst was attributed to the high dispersion of Ni2P on nano Y zeolite and the exposure of high active centers.