金前驱液pH值对Au-Pd/SiO2催化剂上噻吩加氢脱硫活性的影响

考察了金前驱液的pH值对Au-Pd/SiO2双金属催化剂用于噻吩加氢脱硫反应活性的影响,应用N2吸附,X-光粉末衍射(XRD)、程序升温还原(TPR)等技术对该催化剂的物性与结构进行了表征.发现当金前驱液的pH值为7时制得的双金属催化剂具有较好的加氢脱硫活性,并具有最小的孔径,该催化剂以PdO相与Au0相共存.与Pd/SiO2催化剂相比,Au-Pd/SiO2催化剂的稳定性明显提高.虽然AuxPdy合金相的生成对提高双金属催化剂的脱硫活性不利,但能明显改善催化剂的抗硫中毒能力.

Influence of pH Value of Gold Solution on Hydrodesulfurization of Thiophene over Au-Pd/SiO2 Catalyst

The Au-Pd/SiO2 catalyst was prepared by impregnating SiO2 with HAuCl4 and Pd(NO3)2 solution via an incipient wetness method. The influence of pH value of the gold solution on HDS activity of thiophene over Au-Pd/SiO2 catalyst was assessed. N2 adsorption, X-ray diffraction and temperature-programmed reduction were employed to study the phase structure and reduction behavior of the catalyst. The Au-Pd/SiO2 catalyst prepared by gold solution with pH value of 7 gives the best HDS activity of thiophene. Both PdO and Au0 phases are found to coexist in the bimetallic catalyst. In relative to Pd/SiO2 catalyst, the anti-sulfur capability of Au-Pd/SiO2 catalysts was improved due to the formation of AuxPdy phase.