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Al2O3 as a popular binder added into the K-Fe-MnO/Si-2 catalyst causes a great decrease in olefins selectivity from CO hydrogenation.The results of CO hydrogenation, NH3-TPD, Mossbauer spectra, CO/H2 TPSR and C2H4/H2-TPSR as well as C2H4/H2-pulse reaction are employed to investigate the effect of Al2O3 addition on the acidity of the acidity of the catalyst and the chemical state of Fe as well as the behaviors of the catalyst for CO hydrogenation. It has been shown that the loss in olefin selectivity is from the strong secondary reactions of light olefins and the interaction of forming inorganic salts between FeO and Al2O3. Both side reactions can be inhibited greatly by high temperature calcination of Al2O3 with the achievement of desirable olefin selectivity. Generally, a K-Fe-MnO/Si-2 catalyst (containing Al2O3 binder) is developed for producing light olefins from syngas with better strength and desirable behavior.
Al2O3 as a popular binder added into the K-Fe-MnO / Si-2 catalyst causes a great decrease in olefins selectivity from CO hydrogenation. The results of CO hydrogenation, NH3-TPD, Mossbauer spectra, CO / H2 TPSR and C2H4 / H2 -TPSR as well as C2H4 / H2-pulse reaction are employed to investigate the effect of Al2O3 acid addition on the acidity of the acidity of the catalyst and the chemical state of Fe as well as the behaviors of the catalyst for CO hydrogenation. It has been shown that the loss in olefin selectivity is from the strong secondary reactions of light olefins and the interaction of forming interaction inorganic salts between FeO and Al2O3. Both side reactions can be regulated greatly by high temperature calcination of Al2O3 with the achievement of desirable olefin selectivity. , a K-Fe-MnO / Si-2 catalyst (containing Al2O3 binder) was developed for producing light olefins from syngas with better strength and desirable behavior.