水热-离子色谱法测定重整催化剂中的氯

Determination of Chloride in Reforming Catalyst by Hydrothermal-Ion Chromatography

重整催化剂中的氯为催化剂酸性功能的主要提供者,过量又会对设备产生腐蚀,氯与重整过程有着密不可分的关系,因此对于氯质量分数的测定非常重要。为了建立水热-离子色谱法分离和测定重整催化剂中的氯质量分数,在使用稀氨水(VNH3·H2O∶VH2O=1.5∶40)微沸加热20±5 min的最优实验条件下,测定氯离子的标准曲线在1~10μg·mL^(-1)范围内的方程为:y=8.194x+1.892 5,R^(2)=0.999 1,氯离子的检出限为0.25μg·g^(-1),样品的加标回收率为92.75%~101.2%,RSD为1.88%。该方法方便快速,可操作性强,使用本法对重整催化剂中氯离子进行了测定,获得了满意的结果。

Chlorine in reforming catalyst is the main provider of acid function of catalyst, but excessive chlorine will corrode equipment. Chlorine is closely related to reforming process, so it is very important to determine chlorine mass fraction. A method based on a combination of hydrothermal-ion chromatography(PH-IC) was used for simultaneous separation and determination of the chlorine in the reforming catalyst. Under the optimal experimental conditions of using a dilute ammonia water(VNH3·H2O∶VH2O = 1.5∶40) for microbial heating for 20±5 min, the equation of the standard curve in the range of 1~10 μg·mL^(-1) was: y = 8.194 x + 1.892 5, R^(2) = 0.999 1, the detection limit of chloride ion was 0.25 μg·g^(-1) and the recoveries of the sample were 92.75%~101.2%, and the RSD was 1.88%. The chloride ion mass fraction of the reforming catalyst was determined by this method, and satisfactory results were obtained.