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利用原位红外漫反射技术(DRIFTS)对抗硫中毒催化剂Pt/Ce0.8Gd0.2O1.9(Pt/CGO)上CO吸附、CO/噻吩共吸附以及CO/H2S顺序吸附进行了研究,并与Pt/Al2O3催化剂进行了比较.CO吸附实验表明,1.6%Pt/CGO-800(800℃焙烧)上CO的红外特征吸收峰在2104cm-1,与1.6%Pt/Al2O3-500上CO的红外特征吸收峰(2070cm-1)相比,向高波数方向移动了34cm-1.1.6%Pt/CGO-600上出现两个CO特征吸收峰,主峰位于2108cm-1,肩峰位于2085cm-1.CO/噻吩共吸附实验表明,噻吩导致1.6%Pt/CGO-800上CO吸附的红外特征吸收峰红移至2090cm-1,峰强度略有降低;1.6%Pt/CGO-600上CO的红外特征吸收峰红移至2096cm-1且强度有所降低,同时肩峰消失.而1.6%Pt/Al2O3-500上CO的红外特征吸收峰明显减弱并红移至2040cm-1.CO/H2S顺序吸附实验表明,H2S导致Pt/CGO催化剂在2104和2108cm-1处的CO特征吸收峰轻微红移,峰强度略有降低,而H2S导致Pt/Al2O3完全丧失CO的吸附能力.原位DRIFTS表征结果表明,Pt/CGO催化剂上生成的强缺电子特性Pt颗粒具有很强的抗硫中毒能力,800℃焙烧有利于生成单一的抗硫中毒的强缺电子Pt金属位,使得1.6%Pt/CGO-800具有最佳的抗硫中毒性能.
The CO adsorption, CO / thiophene co-adsorption and CO / H2S adsorption on Pt / Ce0.8Gd0.2O1.9 (Pt / CGO) catalysts were studied by in situ infrared diffuse reflectance spectroscopy (DRIFTS) / Al2O3 catalyst.CO adsorption experiments showed that the infrared absorption peak of CO at 1.6% Pt / CGO-800 (calcined at 800 ℃) was at 2104cm-1, which was related to the infrared absorption of CO on 1.6% Pt / Al2O3-500 (2070cm-1), two CO characteristic absorption peaks shifted to 34cm-1.1.6% Pt / CGO-600 in the direction of high wavenumber, with the main peak at 2108cm-1 and the shoulder peak at 2085cm-1. The thiophene co-adsorption experiment showed that the thiophene led to the red shift of the infrared absorption peak of CO adsorption on 1.6% Pt / CGO-800 to 2090cm-1, the peak intensity decreased slightly; the infrared absorption peak of CO on 1.6% Pt / CGO-600 Red shift to 2096cm-1 and the intensity decreased, while the shoulder peak disappeared.While the infrared absorption peak of 1.6% Pt / Al2O3-500 on the CO significantly weakened and red-shifted to 2040cm-1 .CO / H2S sequential adsorption experiments show that, H2S led to a slight red shift of the CO characteristic absorption peak at 2104 and 2108 cm-1 for Pt / CGO catalyst, with a slight decrease in peak intensity, whereas H2S resulted in complete loss of CO adsorption capacity by Pt / Al 2 O. In situ DRIFTS characterization Pt / CGO catalysts have strong electron-deficient properties. Pt particles have a strong resistance to sulfur poisoning. The calcination at 800 ℃ is conducive to the formation of a single electron-deficient Pt metal site resistant to sulfur poisoning. The Pt / CGO- 800 has the best anti-sulfur poisoning performance.