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- W2382737359 abstract "The catalyst for catalytic cracking of C4 alkenes to propylene was prepared using ultra-fine silico oxide as the carrier and ZSM-5 molecular sieve with high SiO_2/Al_2O_3 molar ratio as the active component. Th precursors of CaO and La_2O_3 were used to adjust the acidic properties of the catalyst. The catalyst co-modified by CaO and La_2O_3 were pretreated at 800 ℃ under the protection of inert gas for 48 h or a 600 ℃ with water vapor for 24 h. The properties of the catalysts were investigated under the the reactio condition as follows: 500 ℃ ,0. 1 MPa,ω(H_2O): ω(C_4~=) =0. 2, C_4~= space velocity 3 h~(-1) ,and continuou operation for 25 days. The as-prepared catalysts were characterized by BET, NH_3-TPD and Py-IR. Th, results showed that the activity of the catalysts were decreased after long time treatment at 800 ℃ or600 ℃ with water vapor. The characterization results indicated that the catalytic activity of the catalysts was relate to the contents of Lewis acid and Br(o|¨)nsted acid on its surface." @default.
- W2382737359 created "2016-06-24" @default.
- W2382737359 creator A5053310367 @default.
- W2382737359 date "2011-01-01" @default.
- W2382737359 modified "2023-09-28" @default.
- W2382737359 title "Stability of the catalyst for C_4 alkenes to propylene" @default.
- W2382737359 hasPublicationYear "2011" @default.
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