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Effect of Support on CO Oxidation Performance over the Pd/CeO2 and Pd/CeO2–ZrO2 Catalyst
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-01-21 , DOI: 10.1021/acs.iecr.9b05351 Hang Li 1 , Meiqing Shen 1, 2, 3 , Jianqiang Wang 1 , Hui Wang 1 , Jun Wang 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-01-21 , DOI: 10.1021/acs.iecr.9b05351 Hang Li 1 , Meiqing Shen 1, 2, 3 , Jianqiang Wang 1 , Hui Wang 1 , Jun Wang 1
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In this study, we investigated different palladium-support interactions over the Pd/CeO2 and Pd/CeO2–ZrO2 catalyst and illuminated the effect of support on CO oxidation performance. Pd/CeO2, Pd/Ce0.7Zr0.3O2, and Pd/Ce0.3Zr0.7O2 were prepared by impregnation, and their structural properties and palladium states were characterized systematically. Results demonstrate that the interaction is reflected as the strength of palladium-oxygen bonding, which depends on the amount of surface oxygen of supports. For this reason, palladium species prefers to exist as the ionic state on Pd/CeO2 but as the metallic state on Pd/Ce0.3Zr0.7O2. Although Pd/CeO2 exhibits higher palladium dispersion, it presents lower TOFs for CO oxidation because of the weak CO adsorption capacity of Pd2+. After hydrothermal aging, palladium species interacts less with the support, resulting in the presence of metallic Pd0 and bulk PdO. The aged catalysts show the same TOFs for CO oxidation. Aged Pd/Ce0.7Zr0.3O2 exhibits higher palladium dispersion and superior activity.
中文翻译：
载体对Pd / CeO 2和Pd / CeO 2 -ZrO 2催化剂上CO氧化性能的影响
在这项研究中，我们研究了Pd / CeO 2和Pd / CeO 2 -ZrO 2催化剂上不同的钯-载体相互作用，并阐明了载体对CO氧化性能的影响。通过浸渍法制备了Pd / CeO 2，Pd / Ce 0.7 Zr 0.3 O 2和Pd / Ce 0.3 Zr 0.7 O 2，并对它们的结构性质和钯态进行了表征。结果表明，相互作用反映为钯-氧键的强度，其强度取决于载体的表面氧含量。因此，钯种更倾向于以离子态存在于Pd / CeO上2，但如在Pd / Ce的金属态0.3的Zr 0.7 Ò 2。尽管Pd / CeO 2表现出较高的钯分散性，但由于Pd 2+对CO的吸附能力较弱，因此其对CO氧化的TOF较低。在水热老化之后，钯物质与载体的相互作用较少，导致存在金属Pd 0和块状PdO。老化的催化剂对CO氧化显示相同的TOF。老化的Pd / Ce 0.7 Zr 0.3 O 2表现出更高的钯分散性和优异的活性。
更新日期：2020-01-22
中文翻译：
载体对Pd / CeO 2和Pd / CeO 2 -ZrO 2催化剂上CO氧化性能的影响
在这项研究中，我们研究了Pd / CeO 2和Pd / CeO 2 -ZrO 2催化剂上不同的钯-载体相互作用，并阐明了载体对CO氧化性能的影响。通过浸渍法制备了Pd / CeO 2，Pd / Ce 0.7 Zr 0.3 O 2和Pd / Ce 0.3 Zr 0.7 O 2，并对它们的结构性质和钯态进行了表征。结果表明，相互作用反映为钯-氧键的强度，其强度取决于载体的表面氧含量。因此，钯种更倾向于以离子态存在于Pd / CeO上2，但如在Pd / Ce的金属态0.3的Zr 0.7 Ò 2。尽管Pd / CeO 2表现出较高的钯分散性，但由于Pd 2+对CO的吸附能力较弱，因此其对CO氧化的TOF较低。在水热老化之后，钯物质与载体的相互作用较少，导致存在金属Pd 0和块状PdO。老化的催化剂对CO氧化显示相同的TOF。老化的Pd / Ce 0.7 Zr 0.3 O 2表现出更高的钯分散性和优异的活性。
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