In this study, Pt/Ce_0.6Y_0.4O₂ catalyst was prepared using a citric sol–gel method and was used as a catalyst for a water–gas shift (WGS) reaction. Compared to 1 wt % Pt/CeO₂ and Pt/Y₂O₃ catalysts, the Pt/Ce_0.6Y_0.4O₂ catalyst showed a much higher WGS catalytic activity. At 250 °C, the conversion of carbon monoxide was 86.35% at a weight hourly space velocity of 30 000 cm³ g_cat^–1 h^–1. The physicochemical properties of the catalysts were investigated via X-ray diffraction, transmission electron microscopy, chemisorption, H₂ and CO temperature-programmed reduction, and in situ diffuse reflection infrared Fourier transform spectroscopy. These results confirmed that the catalytic activity did not depend on the dispersion and particle size of platinum. The high reducibility of the Ce_0.6Y_0.4O₂ support plays a crucial role in improving the activity of the Pt/Ce_0.6Y_0.4O₂ catalyst, and this improvement can also be explained by the reduction in CO adsorption strength.

中文翻译：

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Ce _0.6 Y _0.4 O ₂负载铂催化剂对低温水煤气变换反应的催化性能

在这项研究中，使用柠檬酸溶胶-凝胶法制备了Pt / Ce _0.6 Y _0.4 O ₂催化剂，并用作水煤气变换（WGS）反应的催化剂。与1wt％的Pt / CeO ₂和Pt / Y ₂ O ₃催化剂相比，Pt / Ce _0.6 Y _0.4 O ₂催化剂显示出更高的WGS催化活性。在250°C时，时空速度为30000 cm ³ g _cat ^–1 h ^–1时，一氧化碳的转化率为86.35％。通过X射线衍射，透射电子显微镜，化学吸附，H ₂和CO程序升温还原以及原位漫反射红外傅里叶变换光谱研究了催化剂的理化性质。这些结果证实催化活性不取决于铂的分散性和粒径。Ce _0.6 Y _0.4 O ₂载体的高还原性在提高Pt / Ce _0.6 Y _0.4 O ₂催化剂的活性中起着至关重要的作用，并且这种改善也可以通过降低CO吸附强度来解释。