Effect of surface composition of Fe catalyst on the activity for the production of high-calorie synthetic natural gas (SNG)

• Published in: The Korean journal of chemical engineering Vol. 34; no. 2; pp. 320 - 327
• Main Authors: Lee, Yong Hee, Lee, Kwan-Young
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.02.2017; Springer Nature B.V; 한국화학공학회
• Subjects: Adsorption; Biotechnology; Carbon; Catalysis; Catalysts; Catalytic activity; Cementite; Chemistry; Chemistry and Materials Science; Composition effects; Hydrocarbons; Industrial Chemistry/Chemical Engineering; Iron carbides; Iron oxides; Materials Science; Paraffins; Reaction Engineering; Regeneration; Substitute natural gas; Surface chemistry; 화학공학; Methanation; Paraffin-to-olefin Ratio; Fischer-Tropsch; Iron Carbide; Fe Catalyst
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-016-0272-6

An Fe 2 O 3 catalyst was applied to the production of high-calorie synthetic natural gas (SNG). With this catalyst, the product distribution changed as the surface composition of the Fe 2 O 3 catalyst changed. The effect of these changes on the catalytic activity was investigated. The active phases of the Fe 2 O 3 catalyst were a mixture of low-carbon FeC x and Fe 3 C, which was maintained for 10 h, accompanied by the regeneration of Fe 3 O 4 . The surface Fe concentration increased after 10 h reaction, and this increased the CO conversion. In addition, the amounts of adsorbed C 2 H 4 and C 3 H 6 increased, which resulted in an increase in carbon chain growth. The surface concentration of oxygen also increased due to the regeneration of Fe 3 O 4 , thus reducing the C 3 H 6 adsorption strength; in contrast, C 2 H 4 adsorption increased, resulting in an enhanced paraffin-to-olefin (p/o) ratio for C 2 hydrocarbons and reduced p/o ratio for C 3 hydrocarbons.