Preparation Of Aluminumphosphate Molecular Sieves And Their Application To Preferential Oxidation Of CO To H₂-Rich Gases

With the depletion of fossil fuels, hydrogen and other new energy sources becomes more and more important. Preferential oxidation of CO (CO-PROX) is one of the most promising way of removing CO from the H2-rich gases in the fuel cell to a required limit.we know that Aluminophosphate molecular sieve have high surface area and it helps the active component distributing ,so it gets well concerned in the area of catalysis.We prepared aluminophosphates molecular sieve with Co,Ni and Pt through hydrothermal method.We also investigated the effects of the addition of metal ,and the loading of Pt ,pH, Crystallization temperature and Crystallization time,and the Me/Al ratios towards the influenc to aluminophosphates molecular sieve.XRD,TPR,Uv-Vis,and TG echniques were used as characterization techniques to study the catalytic. We investigated the activity of our catalysts.And the results are as follows:Aluminophsphate molecular sieves have been used in CO-PROX for the frst time.Although mealpo-5 show redox property,it wasn`t a promising candidate for CO-PROX. we compared the Mealpo-5 and Me/AlPO-5,the result shows that the metal ions outside the framework is much more active than those inside the framework. On this basis, we prepared Pt catalysts by ion-exchange and impregnation methods, and compared its activity. we use TPR, TEM, XRD techniques to analysis the influenc of the supports towards the distribution of Pt. we further studied Pt-Co/AlPO-5 catalyst,and investigated the influence of Pt/Co ratio.we find out that it is the most active when Pt:Co=1:2(by weitht). In this conditin ,we can reduce the CO concentration below 10ppm.( space velocity of 24,000 mL.gcat-1.h-1. The reactant gas feed: vol.% CO, 1vol.% O2, and 50vol.% H2 in N2).Compared with the literature reported,we can get the similar activity at the same condition,but our Pt loading is smaller.