Pt/CeBDC 衍生的介孔 Pt/CeO2 的高活性低温 HCHO 氧化,New Journal of Chemistry

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Pt/CeBDC 衍生的介孔 Pt/CeO2 的高活性低温 HCHO 氧化
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2023-11-22 , DOI: 10.1039/d3nj03565d
Kangzhong Shi ₁ , Shenjie Lv ₂ , Zelin Hua ₂ , Chenxuanzhi Ruan ₂ , Xingpei Liu ₁ , Nanhua Wu ₃ , Changjie Mao ₁ , Licheng Li ₂

Affiliation

本研究以含Pt的CeBDC为原料，通过高温处理合成了介孔Pt/CeO ₂ (MOF)，用于低温HCHO氧化。催化结果表明，Pt/CeO ₂ (MOF)具有增强的HCHO氧化性能，室温下HCHO转化率高达78%，而商用CeO _{2负载Pt催化剂的转化率仅为31%。}同时，在长期的HCHO氧化实验中，Pt/CeO ₂ (MOF)能够保持催化稳定性。_{动力学研究表明 Pt/CeO 2} (MOF)上的 HCHO 分子更可能被氧化。结构表征表明Pt/CeO ₂ (MOF)不具有有机组成，其元素与商业CeO ₂负载的Pt催化剂相同。_{Pt/CeO 2} (MOF)的Pt纳米颗粒主要分散在CeO ₂的介孔中，显着增加了Pt-O-Ce界面的数量。由于其结构特征，介孔Pt/CeO ₂ (MOF)具有更多的活性氧，包括过氧化物(O ₂²⁻ )。HCHO-DRIFTS研究表明，HCHO分解的两个步骤，即DOM转化和CO氧化的反应速率在Pt/CeO ₂ (MOF)上显着增加。_{此外，Pt/CeO 2} (MOF)的甲酸盐分解步骤比对照催化剂相对更快。_{这些因素可能是介孔Pt/CeO 2} (MOF)优异的低温HCHO氧化性能的原因。

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Highly active low-temperature HCHO oxidation of mesoporous Pt/CeO2 derived from Pt/CeBDC

In the present work, mesoporous Pt/CeO₂(MOF) was synthesized from Pt-containing CeBDC by high-temperature treatment for application in low-temperature HCHO oxidation. The catalytic results show that Pt/CeO₂(MOF) possesses enhanced HCHO oxidation performance where its HCHO conversion rate is up to 78% while that of a commercial CeO₂-supported Pt catalyst is only 31% at room temperature. Simultaneously, in a long-term HCHO oxidation experiment, Pt/CeO₂(MOF) can remain catalytically stable. Kinetic studies demonstrate the more likely oxidation of HCHO molecules on Pt/CeO₂(MOF). Structural characterization shows that Pt/CeO₂(MOF) does not have an organic composition, which is elementally identical to that of a commercial CeO₂-supported Pt catalyst. The Pt nanoparticles of Pt/CeO₂(MOF) are mainly dispersed in the mesopores of CeO₂ to significantly increase the number of Pt–O–Ce interfaces. Due to its structural characteristics, the mesoporous Pt/CeO₂(MOF) possesses more reactive oxygen species, including peroxides (O₂²⁻). HCHO-DRIFTS studies demonstrate that the reaction rates of the two steps of HCHO decomposition, i.e. DOM transformation and CO oxidation, dramatically increase on Pt/CeO₂(MOF). Moreover, the formate decomposition step of Pt/CeO₂(MOF) is relatively faster than those of control catalysts. These factors could be responsible for the excellent low-temperature HCHO oxidation performance of the mesoporous Pt/CeO₂(MOF).

更新日期：2023-11-22

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