碳助剂对完全液相法制备的Cu-Zn-Al催化剂性能的影响

Effect of Carbon Promoters on the Performance of Cu-Zn-Al Catalyst Prepared by Complete Liquid-Phase Technology

采用完全液相法制备了Cu-Zn-Al催化剂,研究了碳纳米管和碳微球的加入对该催化剂CO加氢合成低碳醇反应性能的影响,并用X射线粉末衍射、氮气吸附、氢气程序升温还原和氨气程序升温脱附-质谱等方法对催化剂进行了表征.结果表明,用完全液相法制备的Cu-Zn-Al甲醇合成催化剂具有一定的合成低碳醇和低碳烃的能力,这种能力归结于较大Cu0晶粒的产生.一定量碳微球的加入可大大减小Cu0晶粒度,从而大幅度提高甲醇选择性.

Cu-Zn-Al slurry catalysts were prepared by a complete liquid-phase technology and characterized by X-ray diffraction,N2 adsorption,H2 temperature-programmed reduction,and NH3 temperature-programmed desorption.The effects of carbon nanotubes and carbon microspheres as promoters on catalyst performance for alcohol synthesis were investigated.The results indicated that the Cu-Zn-Al methanol synthesis catalysts showed activity for the synthesis of higher alcohols and hydrocarbons.Cu0 particles with larger grain size were conducive to the growth of carbon chains.Adding carbon microspheres can significantly decrease the size of Cu0 particles and improve the selectivity for methanol.