6 research outputs found
Heat Transfer and Thermographic Analysis of Catalyst Surface during Multiphase Phenomena under Spray-Pulsed Conditions for Dehydrogenation of Cyclohexane over Pt Catalysts
Dehydrogenation of cyclohexane over Pt/alumite and Pt/activated carbon catalysts has been carried out for
hydrogen storage and supply to fuel cell applications. An unsteady state has been created using spray pulsed
injection of cyclohexane over the catalyst surface to facilitate the endothermic reaction to occur efficiently.
Higher temperature of the catalyst surface is more favorable for the reaction, thus the heat transfer phenomena
and temperature profile under alternate wet and dry conditions created using spray pulsed injection becomes
important. IR thermography has been used for monitoring of temperature profile of the catalyst surface simultaneously with product analysis. The heat flux from the plate-type heater to the catalyst has been estimated using a rapid temperature recording and thermocouple arrangement. The estimated heat flux under transient conditions was in the range of 10-15 kW/m2, which equates the requirement for endothermic reactions to the injection frequency of 0.5 Hz, as used in this study. The analysis of temperature profiles, reaction products over two different supports namely activated carbon cloth and alumite, reveals that the more conductive support such as alumite is more suitable for dehydrogenation of cyclohexane
Production of hydrogen-rich gas via reforming of iso-octane over Ni–Mn and Rh–Ce bimetallic catalysts using spray pulsed reactor
The conversion of hydrocarbon fuels such as gasoline and diesel is a potential source for hydrogen production towards various
fuel cell systems. A novel spray pulsed mode reactor to create alternate wet and dry conditions on the catalyst surface has been used
in this study to enhance the rates of hydrogen production compared with the solid-gas phase reaction due to the improvement of
the catalyst reactant contact. The production of hydrogen-rich gas by reforming of iso-octane (2,2,4-trimethylepentane) in the
presence of steam and air has been studied at 600 and 700 �C over Ni–Mn and Rh–Ce bimetallic catalysts supported on alumina
mesh. The feed rate of iso-octane was varied from 0.553 to 5.53 m mol min)1 by controlling pulse injection in terms of the width
and frequency of injection of iso-octane. Based on the product analysis optimized condition for higher hydrogen production and
high H2/CO ratio has been deduced
Heat Transfer and Thermographic Analysis of Catalyst Surface during Multiphase Phenomena under Spray-Pulsed Conditions for Dehydrogenation of Cyclohexane over Pt Catalysts
Dehydrogenation of cyclohexane over Pt/alumite and Pt/activated carbon catalysts has been carried out for
hydrogen storage and supply to fuel cell applications. An unsteady state has been created using spray pulsed
injection of cyclohexane over the catalyst surface to facilitate the endothermic reaction to occur efficiently.
Higher temperature of the catalyst surface is more favorable for the reaction, thus the heat transfer phenomena
and temperature profile under alternate wet and dry conditions created using spray pulsed injection becomes
important. IR thermography has been used for monitoring of temperature profile of the catalyst surface
simultaneously with product analysis. The heat flux from the plate-type heater to the catalyst has been estimated
using a rapid temperature recording and thermocouple arrangement. The estimated heat flux under transient
conditions was in the range of 10-15 kW/m2, which equates the requirement for endothermic reactions to
the injection frequency of 0.5 Hz, as used in this study. The analysis of temperature profiles, reaction products
over two different supports namely activated carbon cloth and alumite, reveals that the more conductive
support such as alumite is more suitable for dehydrogenation of cyclohexane