INTERACTION OF THE CATALYTIC Fe/-Al2O3 SYSTEM WITH PROBE MOLECULES II. STUDY OF -Al2O3 SUPPORT AND Fe/-Al2O3 SYSTEM AFTER INTERACTION WITH HYDROGEN AND AMMONIA

Abstract

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INTERACTION OF THE Fe/γ-Al2O3 CATALYTIC SYSTEM WITH PROBE MOLECULES IV. STUDY OF THE INTERACTION OF HYDROGEN WITH γ-Al2O3 OXIDE AND THE Fe/γ-Al2O3 SYSTEM

“…In the initial Fe/γ-Al It should be noted that in the Fe/γ-Al 2 O 3 system (initial state) there are absorption bands belonging to the -OH groups on the surface of aluminum hydroxides. This is in good agreement with the data presented in our works [11,12]. There were noted that during the synthesis of the Fe/γ-Al 2 O 3 system by impregnation partial hydrolysis of aluminum oxide can occur resulting in the formation of a certain amount of aluminum hydroxide.…”

“…Noteworthy is the temperature shift of the adsorption peaks for the Fe/γ-Al 2 O 3 system, regardless of the iron content, in comparison with γ-Al 2 O 3 oxide. This may be due to the fact that in the case of the Fe/γ-Al 2 O 3 system with 3 and 13% of iron content and is almost completely coated with an ironcontaining component, as was shown using scanning electron microscopy in [11,12 ] and therefore, adsorption should take place on it.…”

“…The amount of desorbed gas, 10 -4 mol/g The total amount of desorbed gas, The appearance of the third additional desorption peak of C, C for the 3%Fe/γ-Al 2 O 3 , 13%Fe/γ-Al 2 O 3 systems, respectively, in comparison with γ-Al 2 O 3 oxide is associated with the presence of an ironcontaining component on the surface of aluminum oxide. The differences between the 3%Fe/γ-Al 2 O 3 and 13%Fe/γ-Al 2 O 3 systems (temperature ranges for the existence of the B, B and C, C peaks) can be explained by the fact that for the 13%Fe/γ-Al 2 O 3 system coating the surface of alumina with an ironcontaining component is multilayer [11,12].…”

“…This work is a continuation of studies on the interaction of a heterogeneous catalytic system with adsorbed molecules [11][12][13].…”

“…Experimental. Fe/γ-Al 2 O 3 system with an iron content of 3; 13 wt.% was prepared by impregnating [10][11][12][13] the initial γ-Al 2 O 3 oxide with an aqueous solution of iron acetate, followed by drying and calcination in air.…”