钯-铂重整催化剂中铂含量测定的干扰因素及消除方法  

Interference factors and elimination method on the determination of Pt content in Pd-Pt reforming catalyst

作　　者：何崇慧 全民强 边虎 牛承祥 HE Chong-hui;QUAN Min-qiang;BIAN Hu;NIU Chen-xiang(Lanzhou Petrochemical Research Center,Petrochemical Research Institute,PetroChina,Lanzhou 730060,China)

机构地区：[1]中国石油石油化工研究院兰州化工研究中心,甘肃兰州730060

出　　处：《石化技术与应用》2024年第2期139-143,共5页Petrochemical Technology & Application

摘　　要：按照NB/SH/T 0570-2017检测标准,使用分光光度法测定了Al2O3基钯-铂重整催化剂中的铂含量,考察了络合物放置时间、氧化铝、共存元素钯等因素对铂含量测定的影响,并采取共存离子掩蔽法消除了钯的存在对铂含量测定产生的干扰。结果表明:氯铂酸锡络合物的最佳放置时间为1 h,基体氧化铝对铂元素的测定没有影响,钯的存在使得铂含量测定结果偏大;在每100 mL待测溶液中添加2.5 mL的1,2-环己二胺四乙酸(质量分数1.0%),可消除钯对铂含量测定的干扰;在优化条件下,测定HH-8及HH-9催化剂试样中铂质量分数平均值分别为0.237%,0.179%,相对标准偏差小于3%,方法检出限为0.16 mg/L,加标回收率为97.3%~101.0%。Pt content in Al2O3-based Pd-Pt reforming catalyst was determined by spectrophotometer method according to the detection standard of NB/SH/T 0570—2017,the influence of the time of complex placement,alumina and coexisting element Pd on the determination of Pt was investigated,and the interference of Pd on the determination of Pt was eliminated by coexisting ion masking method.The results showed that the best placement time of the Tin chloroplatinate complex was 1 h,the Al2O3 had no effect on the determination of Pt,and by addition of 2.5 mL of 1,2-cyclohexanediamine tetraacetic acid(1.0%by mass fraction)per 100 mL of the solution to be determined and eliminated the interference of Pd to the determination of Pt.Under the optimum conditions,the average Pt mass fraction in HH-8 and HH-9 catalyst samples was 0.237% and 0.179%,respectively.The relative standard deviation was less than 3%.The detection limit was 0.16 mg/L,and the tagged recovery rates were 97.3%-101.0%.

关 键 词：钯-铂重整催化剂 分光光度法 铂含量 干扰因素 1 2-环己二胺四乙酸 氯化亚锡 

分 类 号：TE624.92[石油与天然气工程—油气加工工程] O652[理学—分析化学]