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Transformation and Reactivity of a Potassium Catalyst during Coal–Steam Catalytic Pyrolysis and Gasification
Author(s) -
Wang Xingjun,
Zhu Huaili,
Wang Ximin,
Liu Haifeng,
Wang Fuchen,
Yu Guangsuo
Publication year - 2014
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201402003
Subject(s) - potassium , pyrolysis , chemistry , catalysis , coal , crystallite , potassium silicate , inorganic chemistry , leaching (pedology) , residue (chemistry) , steam reforming , chemical engineering , nuclear chemistry , organic chemistry , silicate , hydrogen production , environmental science , soil science , engineering , soil water , crystallography
The transformation of potassium catalyst during coal pyrolysis and steam gasification has been studied in a fixed‐bed reactor. The gasification residues were obtained by leaching in the water and drying in an oven. The crystallite constituents and ash constituent of the gasification residue were identified by X‐ray diffraction (XRD) and X‐ray fluorescence (XRF). The results showed that potassium aluminum silicate crystallites were derived from the interaction of potassium with mineral matter. The amount of reduced potassium in the gasification residue was measured by adding steam at low‐temperature conditions. The transformation of potassium catalyst and amount of metallic potassium intermediate were determined during pyrolysis and gasification. The amount of K 2 CO 3 pyrolysis residue decreased as the pyrolysis temperature increased, and the reaction activity increased as the amount of reduced‐state potassium increased.