Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2008-03-31

Journal: CATALYSIS COMMUNICATIONS

Included Journals: EI、SCIE

Volume: 9

Issue: 6

Page Number: 1132-1136

ISSN: 1566-7367

Key Words: mesoporous molecular sieves; polystyrene; catalytic pyrolysis; styrene

Abstract: K(2)O/Si-MCM-41 molecular sieve was prepared by impregnating Si-MCM-41 with KNO(3). The obtained material was characterized by XRD, FT-IR, TEM and N(2)Ad/De, the results indicated that K(2)O/Si-MCM-41 was of typical mesoporous structure, and the longrange order of K(2)O/MCM-41 became poorer with the increase of K(2)O. The catalytic properties of K(2)O/Si-MCM-41 were investigated in the pyrolysis of polystyrene (PS). The results were compared with those obtained using CaO, Si-MCM-41 and Al-MCM41 as catalysts. It was shown that K(2)O/Si-MCM-41 is of better catalytic activity. The effect of preparing conditions on activity of K(2)O/Si-MCM-41 was discussed. KNO(3) was almost completely decomposed into K(2)O at optimum calcination temperature of 600 degrees C. Under the optimum conditions of mass percentage of K(2)O 9%, temperature 400 degrees C, m(catalyst):m(PP) = 0.02 and reaction time 0.5 h, the conversion of PS was 90.53%, the yield of liquid products was 85.67%, and the yield or styrene reached 69.02%. Published by Elsevier B.V.