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Effects of promoters on catalytic activity and carbon deposition of Ni/γ‐Al 2 O 3 catalysts in CO 2 reforming of CH 4
Author(s) -
Wang Shaobin,
Lu G Q Max
Publication year - 2000
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/1097-4660(200007)75:7<589::aid-jctb241>3.0.co;2-7
Subject(s) - catalysis , inorganic chemistry , chemistry , methane , alkaline earth metal , carbon fibers , reactivity (psychology) , coke , alkali metal , oxide , carbon dioxide reforming , metal , syngas , chemical engineering , materials science , organic chemistry , composite number , medicine , alternative medicine , pathology , engineering , composite material
Catalytic reforming of methane with carbon dioxide was studied in a fixed‐bed reactor using unpromoted and promoted Ni/γ‐Al 2 O 3 catalysts. The effects of promoters, such as alkali metal oxide (Na 2 O), alkaline‐earth metal oxides (MgO, CaO) and rare‐earth metal oxides (La 2 O 3 , CeO 2 ), on the catalytic activity and stability in terms of coking resistance and coke reactivity were systematically examined. CaO‐, La 2 O 3 ‐ and CeO 2 ‐promoted Ni/γ‐Al 2 O 3 catalysts exhibited higher stability whereas MgO‐ and Na 2 O‐promoted catalysts demonstrated lower activity and significant deactivation. Metal‐oxide promoters (Na 2 O, MgO, La 2 O 3 , and CeO 2 ) suppressed the carbon deposition, primarily due to the enhanced basicities of the supports and highly reactive carbon species formed during the reaction. In contrast, CaO increased the carbon deposition; however, it promoted the carbon reactivity. © 2000 Society of Chemical Industry