Catalyst Development for Toluene Hydroisomerization Reaction

• Main Authors: TSAI,WEI-YUN, 蔡瑋芸
• Other Authors: 張仁瑞
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/81389673080942477581

碩士 === 國立中正大學 === 化學工程研究所 === 104 === The purpose of this research is to isomerize methylcyclohexane and hydrogenation saturation of toluene at the same time and to produce dimethylcyclopentane and isomers with low aromatic and environmentally friendly characteristic. To study the correlation between structure of catalysts and reaction, toluene is used as feed. Zeolites and platinum metal on catalysts and its surface structure are characterized analyzed by XPRD (X-ray powder diffraction), EXAFS (extend X-ray absorption fine structure) and BET. This research designed bi-functional catalysts which make hydrogenation saturation and isomerization happen at the same time and save process costs. To make catalysts undergo hydrogenation saturation and isomerization and reduce generation of fuel gas (C4-) at the same time, the design of catalysts such as Si/Al ratio, binder and operating conditions of reactions can influence the profit of process directly. From previous researches, catalysts with SiO2 binder have higher isomerization selectivity than catalysts with AlO2 binder is known. Ludox is a better gel than Hi-Sil gel. However Ludox is expensive and mechanical strength of catalysts with Ludox as the binder is low. Therefore, less acidity Hi-Sil gel which has the characteristic of Ludox and doesn’t corrode zeolites is developed. The platinum metal structure and the zeolites Si/Al ratio of the pellets Pt/HY catalysts made by the method described above are directly related. From the results of research, the larger the platinum metal sizes are, the more stable of the catalysts in reactions. Hence, the isomerization yield of the reaction with Pt catalysts made by CBV780 and low sulfur feed is above 50%. ( isomerization selectivity is above 90%). The fuel gas yield is less than 1%.