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H 2 S effect on dry reforming of biogas for syngas production
Author(s) -
Chein Reiyu,
Yang ZengWei
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4470
Subject(s) - syngas , carbon dioxide reforming , methane reformer , sorbent , catalysis , hydrogen sulfide , chemistry , hydrogen production , steam reforming , methane , calcium oxide , chemical engineering , catalytic reforming , partial oxidation , biogas , sulfur , inorganic chemistry , waste management , adsorption , organic chemistry , engineering
Summary The effect of hydrogen sulfide (H 2 S) on dry reforming of biogas for syngas production was studied both experimentally and theoretically. In the experimental work, the H 2 S effect on Ni‐based catalyst activity was examined for reaction temperatures ranging from 600°C to 800°C. It was found that the presence of H 2 S deactivated the Ni‐based catalysts significantly because of sulfur poisoning. Although bimetallic Pt‐Ni catalyst has better performance compared with monometallic Ni catalyst, deactivation was still found. The time‐on‐stream measured data also indicated that sulfur‐poisoned catalyst can be regenerated at high reaction temperatures. In the theoretical work, a thermodynamic equilibrium model was used to analyze the H 2 S removal effect in dry reforming of H 2 S‐contained biogas. Calcium oxide (CaO) and calcium carbonate (CaCO 3 ) were used as the H 2 S sorbent. The results indicated that H 2 S removal depends on the initial H 2 S concentration and reaction temperature for both sorbents. Although CO 2 was also removed by CaO, the results from equilibrium analysis indicated that the dry reforming reaction in the presence of CaO was feasible similar to the sorption enhanced water‐gas shift and steam‐methane reforming reactions. The simulation results also indicated that CaO was a more preferable H 2 S sorbent than CaCO 3 because syngas with an H 2 /CO ratio closer to 2 can be produced and requires lower heat duty.