CO resistance performance and industrial application of second-stage pyrolysis gasoline hydrogenation catalyst LY-9802
The effect of CO resistance perfor-mance on the second-stage hydrogenation catalyst LY-9802 of pyrolysis gasoline was studied in view of the high CO volume fraction of hydrogen(more than 1 000×10-6)in some pyrolysis gasoline hydro-genation units.And the industral application of cat-alyst LY-9802 was investigated.The results showed that CH4 was produced from CO on the second stage hydrogenation catalyst.As the reaction temperature increased,both CO conversion rate and CH4 gener-ation rate increased,but the CO conversion rate did not exceed 60%.Under the small-scale hydrogena-tion reaction conditions with CO volume fraction of 1 400×10-6 and inlet temperature of 245-260℃,the bromine value of the product was 0.005-0.008 g/g,and the sulfur content was 0.5-0.8 μg/g.When the inlet temperature was 265 and 275℃,the bromine value of the product was less than 0.005 and 0.001 g/g,and the sulfur content was less than 0.5,0.1 μg/g,respectively.Increasing the inlet tempera-ture could effectively recover and enhance the cata-lyst activity.The industrial operation results showed that at the reactor inlet temperature 280-320℃,and temperature rise of the bed between 40-60℃,the bromine value of hydrogenation product was less than 0.001 g/g and the sulfur content was less than 0.5 μg/g,which all met the index requirements.
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