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首页> 外文会议>International conference on applications of the mossbauer effect >Investigation by Mossbauer spectroscopy of Sn redox transformations during H_2/O_2 titration on Pt/Al_2O_3Sn-Cl and Pt/Al_2O_3SnIn-Cl naphtha reforming catalysts
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Investigation by Mossbauer spectroscopy of Sn redox transformations during H_2/O_2 titration on Pt/Al_2O_3Sn-Cl and Pt/Al_2O_3SnIn-Cl naphtha reforming catalysts

机译：在Pt / Al_2O_3SN-Cl和Pt / Al_2O_3SNIN-Cl石脑油转化的H_2 / O_2滴定期间SN氧化还原转化的SN氧化还原转化的研究

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Bimetallic Pt/Al_2O_3Sn-Cl and trimetallic Pt/Al_2O_3SnIn-Cl catalysts were characterized by H_2/O_2 double titration and ~(119)Sn Mossbauer spectroscopy. The addition of Sn or both Sn and In to the monometallic Pt/Al_2O_3-Cl catalyst leads to an increase in the volume of chemisorbed O_2 at each titration. For bimetallic and trimetallic catalysts the increase in the Pt dispersion, calculated from the second oxygen titre, abnormally surpasses the barrier of 100%. Characterization of samples obtained after each step of the H_2/O_2 titration sequence using ~(119)Sn Moessbauer spectroscopy allowed to follow the redox transformations of Sn species suspected of contributing to O_2 consumption. ~(119)Sn Mossbauer spectra show that after reduction unalloyed metallic Sn and PtSn alloy phases are formed in bi- and trimetallic catalysts respectively. These metallic phases are oxidized upon the first oxygen titre into the so-called Pt_xSn(O) oxometallic phases. The index calculated from this titre thus expresses the Pt-Sn bimetallic character and is called the bimetallicity index (BMI). These latter phases further undergo reduction and regeneration (oxidation) upon the second O_2 titre and thus contribute to the calculated Pt dispersion as well.
机译：通过H_2 / O_2双重滴定和〜（119）SN mossbauer光谱，表征了双金属Pt / Al_2O_3SN-Cl和三种菌Pt / Al_2O_3Snin-Cl催化剂。添加Sn或Sn和Sn的单金属Pt / Al_2O_3-Cl催化剂的加入导致每个滴定的化学吸附O_2的体积增加。对于双金属和三种金属催化剂，从第二氧滴度计算的Pt分散体的增加异常超过1​​00％的屏障。使用〜（119）Sn Moessbauer光谱在H_2 / O_2滴定序列的每个步骤后获得的样品的表征允许遵循怀疑涉及O_2消费的SN种类的氧化还原转化。 〜（119）Sn Mossbauer光谱表明，在减少未结合的金属Sn和PTSN合金相分别在双组和三类金属催化剂中形成。将这些金属相在第一个氧滴度上氧化成所谓的PT_XSN（O）氧气相阶段。从该滴度计算的指数因此表达了PT-SN双金属特征，称为BimeTallicity指数（BMI）。在第二o_2滴度上进一步经历逐阶段的再生（氧化），因此也有助于计算的Pt分散。

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