The effect of BaO doping to the Pt-Rh catalysts on its three-way catalytic activity and water-gas transfer was investigated. The results show that the light-off temperatures of hydrocarbon and carbon monoxide and nitr...The effect of BaO doping to the Pt-Rh catalysts on its three-way catalytic activity and water-gas transfer was investigated. The results show that the light-off temperatures of hydrocarbon and carbon monoxide and nitrogen oxides have little difference in the fresh catalysts. But after the hydrothermal-aged 5 h at 1000 ℃, the catalysts containing CeO2-ZrO2-BaO has lower light-off temperature and better catalytic activity than the catalysts containing BaO and CeO2-ZrO2,展开更多
The effects of BaO doping on the three-way catalytic activity of Pt-Rh catalyst and on water-gas shift were investigated. The results show that the light-off temperatures of hydrocarbon and carbon monoxide and nitroge...The effects of BaO doping on the three-way catalytic activity of Pt-Rh catalyst and on water-gas shift were investigated. The results show that the light-off temperatures of hydrocarbon and carbon monoxide and nitrogen oxides of the fresh catalysts slightly differ from those of the aged catalysts, and the catalysts containing CeO2-ZrO2-BaO have lower lightoff temperature and better catalytic activity than these containing BaO and CeO2-ZrO2 after hydrothermal aging for 5 h at 1000 ℃. The catalysts were characterized by means of the temperature-programmed reduction （TPR） in hydrogen and the temperature-programmed desorption （TPD） in oxygen. It is confirmed that the suggested route of CeO2-ZrO2-BaO by coprecipitation can improve the catalytic activity of catalysts.展开更多
液相催化交换是氢-水同位素交换工艺的重要技术。本工作采用自行研制的大粒径4 mm柱型Pt-SDB催化剂与4 mm Dixon填料,开展了氢-水交换工艺实验研究。研究结果表明,在填料与催化剂体积填装比为1∶1时,等板高度最低,氢-水交换分离效果最好...液相催化交换是氢-水同位素交换工艺的重要技术。本工作采用自行研制的大粒径4 mm柱型Pt-SDB催化剂与4 mm Dixon填料,开展了氢-水交换工艺实验研究。研究结果表明,在填料与催化剂体积填装比为1∶1时,等板高度最低,氢-水交换分离效果最好;在50℃到70℃之间,随着催化交换反应温度升高,等板高度降低,当温度大于70℃时,等板高度变化不大,最优反应温度为70℃;随着气液比的增加,等板高度增大,气体流速比改变液体喷淋密度对等板高度的影响大。展开更多
铂耗和氨耗是硝酸生产的主要技术指标。在流动氧气氛模拟条件下,以及800~950℃的硝酸生产实际氨氧化环境中,Pt-Rh二元和Pt-Pd-Rh三元合金及其催化网的失重和铂耗均遵循相同的模式,即ΔW/S=Kt2/3与ΨΣ=K't2/3。工厂实际测定数据表明...铂耗和氨耗是硝酸生产的主要技术指标。在流动氧气氛模拟条件下,以及800~950℃的硝酸生产实际氨氧化环境中,Pt-Rh二元和Pt-Pd-Rh三元合金及其催化网的失重和铂耗均遵循相同的模式,即ΔW/S=Kt2/3与ΨΣ=K't2/3。工厂实际测定数据表明,在常压氨氧化法生产硝酸过程中,Pt-12Pd-3.5Rh合金催化网的铂耗为0.044 g Pt/t(HNO3),比Pt-4Pd-3.5Rh合金催化网的铂耗(0.061g Pt/t(HNO3))低28%;在中压氨氧化法生产硝酸过程中,Pt-12Pd-3.5Rh合金催化网的铂耗为0.121g Pt/t(HNO3),比Pt-5Rh和Pt-10Rh合金催化网的铂耗(0.15~0.153 g Pt/t(HNO3))低21%,而其氨耗比后者降低3%~7%。研究结果证明,在Pt-Rh合金中添加钯或在Pt-Pd-Rh合金中增加钯含量明显降低催化合金的铂耗。展开更多
We will highlight the values Umicore's unique Process Excellence Model is based upon and how these do correlate with the overall culture of Umicore. Besides, we are going to explain about the benefits for the targ...We will highlight the values Umicore's unique Process Excellence Model is based upon and how these do correlate with the overall culture of Umicore. Besides, we are going to explain about the benefits for the target industries that come along with our approach. Here, we will not mainly focus on the usually mentioned cost saving potential, but how also other aspects do create substantial value for the industries.展开更多
文摘The effect of BaO doping to the Pt-Rh catalysts on its three-way catalytic activity and water-gas transfer was investigated. The results show that the light-off temperatures of hydrocarbon and carbon monoxide and nitrogen oxides have little difference in the fresh catalysts. But after the hydrothermal-aged 5 h at 1000 ℃, the catalysts containing CeO2-ZrO2-BaO has lower light-off temperature and better catalytic activity than the catalysts containing BaO and CeO2-ZrO2,
基金Project supported by the National Natural Science Foundation of China (20273043) the National Nature Science KeyFoundation of China (20333030)
文摘The effects of BaO doping on the three-way catalytic activity of Pt-Rh catalyst and on water-gas shift were investigated. The results show that the light-off temperatures of hydrocarbon and carbon monoxide and nitrogen oxides of the fresh catalysts slightly differ from those of the aged catalysts, and the catalysts containing CeO2-ZrO2-BaO have lower lightoff temperature and better catalytic activity than these containing BaO and CeO2-ZrO2 after hydrothermal aging for 5 h at 1000 ℃. The catalysts were characterized by means of the temperature-programmed reduction （TPR） in hydrogen and the temperature-programmed desorption （TPD） in oxygen. It is confirmed that the suggested route of CeO2-ZrO2-BaO by coprecipitation can improve the catalytic activity of catalysts.
文摘液相催化交换是氢-水同位素交换工艺的重要技术。本工作采用自行研制的大粒径4 mm柱型Pt-SDB催化剂与4 mm Dixon填料,开展了氢-水交换工艺实验研究。研究结果表明,在填料与催化剂体积填装比为1∶1时,等板高度最低,氢-水交换分离效果最好;在50℃到70℃之间,随着催化交换反应温度升高,等板高度降低,当温度大于70℃时,等板高度变化不大,最优反应温度为70℃;随着气液比的增加,等板高度增大,气体流速比改变液体喷淋密度对等板高度的影响大。
文摘铂耗和氨耗是硝酸生产的主要技术指标。在流动氧气氛模拟条件下,以及800~950℃的硝酸生产实际氨氧化环境中,Pt-Rh二元和Pt-Pd-Rh三元合金及其催化网的失重和铂耗均遵循相同的模式,即ΔW/S=Kt2/3与ΨΣ=K't2/3。工厂实际测定数据表明,在常压氨氧化法生产硝酸过程中,Pt-12Pd-3.5Rh合金催化网的铂耗为0.044 g Pt/t(HNO3),比Pt-4Pd-3.5Rh合金催化网的铂耗(0.061g Pt/t(HNO3))低28%;在中压氨氧化法生产硝酸过程中,Pt-12Pd-3.5Rh合金催化网的铂耗为0.121g Pt/t(HNO3),比Pt-5Rh和Pt-10Rh合金催化网的铂耗(0.15~0.153 g Pt/t(HNO3))低21%,而其氨耗比后者降低3%~7%。研究结果证明,在Pt-Rh合金中添加钯或在Pt-Pd-Rh合金中增加钯含量明显降低催化合金的铂耗。
文摘We will highlight the values Umicore's unique Process Excellence Model is based upon and how these do correlate with the overall culture of Umicore. Besides, we are going to explain about the benefits for the target industries that come along with our approach. Here, we will not mainly focus on the usually mentioned cost saving potential, but how also other aspects do create substantial value for the industries.
