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- W2370485409 abstract "Three carbonate hydrotalcites(LDH) with same molar ratio of Mg and Al were prepared by constant pH,urea and ultrasonic coprecipitation methods,respectively,and named as LDH-CP,LDH-UR,LDH-US.Their properties were characterized by XRD,N2 adsorption-desorption and thermal analysis.The basicity strength and basic sites amount of the three hydrotalcites were measured by Hammett indicator-benzene carboxylic acid titration,and furthermore,their catalytic activity in the esterification reaction of petroleum acid and glycol was investigated.Based on the characterization and activity assessment results,the esterification reaction mechanism catalyzed by hydrotalcite was discussed.It was found that the hydrotalcite with both more basic sites and higher crystallinity exhibited better catalytic esterification activity.Large amount of basic sites and regular crystal structure favored to producing strong nucleophilicity R1O-anions as well as preventing the formation of free R1O-anions which can cause side reaction.Among the three hydrotalcites,LDH-UR had the highest crystallinity but the smallest amount of basic sites,LDH-US had the poorest crystallinity but the largest amount of basic sites,LDH-CP had both more basic sites amount and higher crystallinity,which showed the best catalytic activity in the esterification reaction of petroleum acid and glycol.Through the esterification reaction catalyzed by LDH-CP the acid number of Suizhong crude oil could be decreased from 3.72 mgKOH/g to less than 0.40 mgKOH/g." @default.
- W2370485409 created "2016-06-24" @default.
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- W2370485409 date "2011-01-01" @default.
- W2370485409 modified "2023-09-24" @default.
- W2370485409 title "Characterization of MgAl Hydrotalcites Prepared by Various Methods and Their Catalytic Activities for Esterification to Remove Acid From Crude Oil" @default.
- W2370485409 hasPublicationYear "2011" @default.
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