Experimental Study on Water-gas Shift Reaction Performance at Ultrahigh Temperatures

• Main Authors: Chien-Min Fang, 方建閔
• Other Authors: Rei-Yu Chein
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/80011618495391056834

碩士 === 國立中興大學 === 機械工程學系所 === 103 === In this study, monometallic and bimetallic catalysts (Pt, Ni, and Pt/Ni) supported on single or multiple oxides (Al2O3, TiO2, CeO2/Al2O3, and CeO2/TiO2) were prepared and tested in the catalytic water-gas shift reaction (WGSR) at ultra-high temperatures.The syngas (18%H2, 22%CO2, 30%CO, 30%N2) and steam with steam to carbon ratio of 1, 3, and 5 were used as the feedstock.The operation pressure was fixed as 1 atm while the reaction temperature was varied from 750 to 850℃.The measured results indicated that Ni/Al2O3 has the worst performance as compared with other catalysts.The reason for this result might be attributed to the poor ability of irreducible oxides on metal dispersion.Better WGSR performance can be resulted from bimetallic catalyst supported by multiple oxides.The best CO conversion and H2 yield obtained were 59.48% and 34.18%, respectively.Based on the measured results showing reduced N2 flow rate at reactor outlet, it is suspected that N2 reacts with H2 and deposited carbon to form ammonia (NH3) and hydrogen cyanide (HCN) and results in low H2 yield.