aucu复合催化剂用于富氢气体中co选择氧化的分析word格式论文.docxVIP

优秀毕业论文 精品参考文献资料 Abstract The polymer-electrolyte membrane fuel cell (PEMFC) utilizes high purity hydrogen as a fuel, and hydrogen is usually produced by steam reforming of methanol and other hydrocarbons. However, the anode of PEMFC is prone to be poisoned by CO contained in the reformed gas, resulting in the damage of battery performance seriously. Preferential oxidation (PROX) has been recognized as one of the most promising and cost effective methods to remove the small amount of CO in hydrogen-rich gas. Thus, high activity and selectivity are the key factors to choose a suitable PROX catalyst that convert CO completely with minimizing or without consumption of hydrogen. Supported gold catalysts have well known ambient temperature activity for CO oxidation and as a good choice for the PROX system. Previous studies have showed that there were somewhat low selectivity and poor stability for supported Au catalyst in CO-PROX reaction, however, the effective combination of Au and Cu can present a synergistic effect, not only enhance the activity and selectivity but also improve the stability. Based on this, in this thesis we studied the catalytic performance ofAu-Cu composite catalysts for CO-PROX reaction. In the first part of this thesis, a series of Au-Cu-FLA catalysts, therein Au as active ingredient, Cu as promoter deposited onto the composite metal oxide carrier FeLaOx-Al2O3 pre-prepared, were prepared by modified deposition-precipitation method. The catalysts were characterized by XRD, BET, H2-TPR, XPS and TEM techniques, and investigated their catalytic activity for CO-PROX reaction in hydrogen-rich gas. The main conclusions are drawn as follows: Effects of the addition of several Mn, Ni, Cu, Zn transition metals on the performance of Au-FLA for CO-PROX were investigated. It was found that introducing Cu into Au-FLA catalyst can enhance catalytic performances, confirming the cooperative effect between copper and gold. Cu content has a great influence on the c