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Study on 2‐propanol/acetone/hydrogen chemical heat pump: endothermic dehydrogenation of 2‐propanol
Author(s) -
Mooksuwan W.,
Kumar S.
Publication year - 2000
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 - 10.1002/1099-114x(20001010)24:12<1109::aid-er646>3.0.co;2-6
Subject(s) - dehydrogenation , catalysis , chemistry , acetone , hydrogen , reaction rate , endothermic process , propanol , activation energy , atmospheric temperature range , inorganic chemistry , organic chemistry , thermodynamics , methanol , adsorption , physics
Low‐temperature thermal energy can be upgraded to higher temperatures by chemical heat pumps. Among the working pairs for chemical heat pumps, 2‐propanol/acetone/hydrogen using a combination of dehydrogenation (of 2‐propanol)/ hydrogenation (of acetone) reaction seems to be promising. This study was aimed at experimentally determining the performance of dehydrogenation of 2‐propanol using a 10 wt% Ru–Pt/activated C catalyst in a temperature range 60–80 °C with a view to study the influence of reaction temperature, catalyst concentration, nitrogen flow, and acetone concentration in liquid reactant on 2‐propanol dehydrogenation in terms of reaction rate and hydrogen produced. The maximum initial reaction rate of 54 mmol h −1 g −1 was obtained at a reaction temperature of 75–80 °C and a catalyst concentration of 1.3 g l −1 . Observations indicate that at constant reaction temperature and catalyst concentration, varying amounts of catalyst and 2‐propanol resulted in different reaction rates. The reaction rate decreases with increasing acetone in liquid reactant. The nitrogen flow strongly influences the reaction rate, as it is used as a stirring medium. The maximum heat utilization of 4.5 per cent was obtained when the oil bath temperature was 100 °C at a catalyst concentration of 1.3 g l −1 . Copyright © 2000 John Wiley & Sons, Ltd.