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A new method for quantitative analysis of metal content in heterogeneous catalysts: Laser ablation—ICP—AES

机译：定量分析非均相催化剂中金属含量的新方法：激光烧蚀—ICP—AES

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Analysis of catalysts by XRF, ICP—AES or AAS requires sample preparation, which is time consuming and a source of contaminations. Analytical performances of direct analysis of catalysts by LA—ICP—AES are evaluated and compared to usual methods.The coupling allows direct and simultaneous analysis of elements from the support and the catalytic phase. The analytical criteria obtained: LODs below 50 ppm, precision better than 5%, linearity from 0.01 to several weight percents and an analysis time less than 5 min, demonstrated that this method represents an interesting alternative to classical methods. Accuracy was evaluated according to different criteria: alumina phase, physico-chemical form of the supported metals, and presence of concomitant metals. Results showed no influence of the alumina phase on Pt—Sn determination in catalysts. Nevertheless, for the analysis of catalysts with high metal loading, matrix effects were observed. As an example, the use of matrix matching was found to give a mean accuracy in the 10% range for Ni determination.
机译：通过XRF，ICP-AES或AAS分析催化剂需要样品前处理，这既费时又是污染源。评估了通过LA-ICP-AES直接分析催化剂的分析性能，并将其与常规方法进行了比较。耦合可以直接和同时分析载体和催化相中的元素。获得的分析标准：LOD低于50 ppm，精度优于5％，线性范围为0.01至几个重量百分比，分析时间少于5分钟，证明该方法是经典方法的有趣替代方法。根据不同的标准评估准确性：氧化铝相，负载金属的物理化学形式以及伴随金属的存在。结果表明，氧化铝相对催化剂中Pt-Sn的测定没有影响。然而，对于分析具有高金属负载量的催化剂，观察到了基体效应。例如，发现使用矩阵匹配可确定Ni的平均准确度在10％范围内。

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