Premium
Steam and oxysteam reforming of methane to syngas over Co x Ni 1− x O supported on MgO precoated SA‐5205
Author(s) -
Choudhary Vasant R.,
Mamman Ajit S.,
Uphade Balu S.
Publication year - 2001
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690470715
Subject(s) - steam reforming , syngas , methane , catalysis , endothermic process , oxidative coupling of methane , methane reformer , selectivity , carbon dioxide reforming , exothermic reaction , chemistry , space velocity , materials science , inorganic chemistry , chemical engineering , organic chemistry , hydrogen production , adsorption , engineering
Abstract Catalytic steam and oxysteam reforming of methane to syngas studied involves coupling of exothermic oxidative conversion and endothermic steam‐reforming processes over Co x Ni 1−x O (x = 0.0–0.5) supported on MgO precoated commercial low surface area (<0.01 m 2 g −1 ) macroporous silica‐alumina SA‐5205 catalyst carrier. The influence of the Co/Ni ratio of the catalyst on its performance in steam and oxysteam reforming processes (at 800 and 850°C) was studied. For the steam reforming process, the Co/Ni ratio influences strongly on the methane and steam conversion and CO selectivity and product H 2 /CO ratio, particularly at lower temperature. When the Co/Ni ratio is increased, the methane and H 2 O conversion and CO selectivity are decreased markedly. For the oxysteam reforming process, the influence of the Co/Ni ratio on the performance is smaller and depends on process conditions. When the Co/Ni is increased, the methane conversion passes through a maximum at the Co/Ni ratio of 0.17. The influence of the reaction temperature (800 and 850°C) and CH 4 /O 2 and CH 4 /H 2 O ratios on the conversion, selectivity, H 2 /CO product ratio, and net reaction heat (ΔH r ) was studied in the oxysteam reforming (at space velocity of 47,000 cm 3 ·g −1 ·h −1 ) over the catalyst with an optimum Co/Ni ratio (0.17) and a higher Co/Ni ratio (1.0). The oxysteam reforming process involves coupling the exothermic oxidative conversion of methane and the endothermic methane steam reforming reactions, making the process highly energy‐efficient and nonhazardous. This process can be made thermoneutral, mildly exothermic, and mildly endothermic by manipulating process conditions.