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| Performance of Hβ zeolites modified by Ce3+ on synthesis of ethyl anthraquinone |
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JIANG Cuiyu1, ZHANG Xinggang2, JIA Dandan2, SONG Linhua1
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(1.College of Science in China University of Petroleum, Qingdao 266580, China;2.College of Chemical Engineering in China University of Petroleum, Qingdao 266580, China)
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| Abstract: |
| One-step reaction of ethyl benzene with phthalic anhydride for ethyl anthraquinone synthesis was achieved over Hβ zeolites modified by Ce(NO3)3·6H2O using ion-exchange, common impregnation, and ultrasonic impregnation. The acidic property of the Hβ zeolites was investigated by means of NH3-TPD and Pyridine-IR. Also, the effect of acidic property of Hβ zeolites modified respectively by Ce(NO3)3·6H2O, Al2(SO4)3·18H2O,(NH4)2SO4, Fe(NO3)3·9H2O, Ce(NH4)2(NO3)6, and Ti(SO4)2 on catalytic performance were studied. The results show that the ultrasonic impregnation is the best modification method. When the Ce2O3 loading on β zeolite is 0.4 g, the yield of ethyl anthraquinone can reach up to 26.54％, in which the conversion of phthalic anhydride is 49.14％, and the selection of ethyl anthraquinone is 54.01％. It is also found that the catalytic performance of Hβ zeolites modified by Ce(NO3)3·6H2O is optimal and the acidic property of zeolites has an important influence on the catalytic performance. The strong acid sites are the active sites in this reaction and the main catalytic active sites are B acid. |
| Key words: modification of Hβ zeolite ion-exchange impregnation synthesis of ethyl anthraquinone |
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