Hydrogen production by glycerol steam reforming with/without calcium oxide sorbent

a comparative study of thermodynamic and experimental work

Xiaodong Wang, Maoshuai Li, Shuirong Li, Hao Wang, Shengping Wang, Xinbin Ma

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Thermodynamic analysis and experimental tests of glycerol steam reforming with/without calcium oxide (CaO) as a carbon dioxide (CO2) sorbent have been performed and compared in this work. Methanol, ethanol, acetaldehyde, acetone and ethylene do not exist in equilibrium conditions according to the equilibrium calculations. Without CaO present, thermodynamic predictions show that a maximum hydrogen concentration of 67% can be obtained at 925 K, with a water to glycerol ratio (WGR) of 9. In the experiments, the Ni/ZrO2 catalyst fails to catalyze the reactions to thermodynamic equilibrium under the selected conditions as the highest hydrogen concentration obtained is 64%. With the presence of CaO, thermodynamic analysis implies hydrogen purity exceeding 95% can be achieved below 925 K at WGRs of 6 and 9. However, CaCO3 does not exist at temperatures greater than 1025 K. In the experiments, a hydrogen purity of 95% with only 5% CH4 as impurity can be reached at 850 K with a WGR of 9. The Ni/ZrO2 catalyst is not active enough to convert excess CH4 to hydrogen in glycerol steam reforming as CH4 concentrations are usually higher than the equilibrium values. The addition of CaO to this system greatly enhances the hydrogen production while reducing the CO concentration.
Original languageEnglish
Pages (from-to)1812-1818
Number of pages7
JournalFuel Processing Technology
Volume91
Issue number12
DOIs
Publication statusPublished - Dec 2010

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Steam reforming
Hydrogen production
Sorbents
Glycerol
Lime
Hydrogen
Thermodynamics
Catalysts
Acetaldehyde
Water
Carbon Monoxide
Acetone
Carbon Dioxide
Methanol
Carbon dioxide
Ethylene
Ethanol
Experiments
lime
Impurities

Keywords

  • hydrogen
  • glycerol
  • CaO sorbent
  • steam reforming
  • thermodynamic analysis

Cite this

Hydrogen production by glycerol steam reforming with/without calcium oxide sorbent : a comparative study of thermodynamic and experimental work. / Wang, Xiaodong; Li, Maoshuai; Li, Shuirong; Wang, Hao; Wang, Shengping; Ma, Xinbin.

In: Fuel Processing Technology, Vol. 91, No. 12, 12.2010, p. 1812-1818.

Research output: Contribution to journalArticle

Wang, Xiaodong ; Li, Maoshuai ; Li, Shuirong ; Wang, Hao ; Wang, Shengping ; Ma, Xinbin. / Hydrogen production by glycerol steam reforming with/without calcium oxide sorbent : a comparative study of thermodynamic and experimental work. In: Fuel Processing Technology. 2010 ; Vol. 91, No. 12. pp. 1812-1818.
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abstract = "Thermodynamic analysis and experimental tests of glycerol steam reforming with/without calcium oxide (CaO) as a carbon dioxide (CO2) sorbent have been performed and compared in this work. Methanol, ethanol, acetaldehyde, acetone and ethylene do not exist in equilibrium conditions according to the equilibrium calculations. Without CaO present, thermodynamic predictions show that a maximum hydrogen concentration of 67{\%} can be obtained at 925 K, with a water to glycerol ratio (WGR) of 9. In the experiments, the Ni/ZrO2 catalyst fails to catalyze the reactions to thermodynamic equilibrium under the selected conditions as the highest hydrogen concentration obtained is 64{\%}. With the presence of CaO, thermodynamic analysis implies hydrogen purity exceeding 95{\%} can be achieved below 925 K at WGRs of 6 and 9. However, CaCO3 does not exist at temperatures greater than 1025 K. In the experiments, a hydrogen purity of 95{\%} with only 5{\%} CH4 as impurity can be reached at 850 K with a WGR of 9. The Ni/ZrO2 catalyst is not active enough to convert excess CH4 to hydrogen in glycerol steam reforming as CH4 concentrations are usually higher than the equilibrium values. The addition of CaO to this system greatly enhances the hydrogen production while reducing the CO concentration.",
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AU - Wang, Shengping

AU - Ma, Xinbin

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N2 - Thermodynamic analysis and experimental tests of glycerol steam reforming with/without calcium oxide (CaO) as a carbon dioxide (CO2) sorbent have been performed and compared in this work. Methanol, ethanol, acetaldehyde, acetone and ethylene do not exist in equilibrium conditions according to the equilibrium calculations. Without CaO present, thermodynamic predictions show that a maximum hydrogen concentration of 67% can be obtained at 925 K, with a water to glycerol ratio (WGR) of 9. In the experiments, the Ni/ZrO2 catalyst fails to catalyze the reactions to thermodynamic equilibrium under the selected conditions as the highest hydrogen concentration obtained is 64%. With the presence of CaO, thermodynamic analysis implies hydrogen purity exceeding 95% can be achieved below 925 K at WGRs of 6 and 9. However, CaCO3 does not exist at temperatures greater than 1025 K. In the experiments, a hydrogen purity of 95% with only 5% CH4 as impurity can be reached at 850 K with a WGR of 9. The Ni/ZrO2 catalyst is not active enough to convert excess CH4 to hydrogen in glycerol steam reforming as CH4 concentrations are usually higher than the equilibrium values. The addition of CaO to this system greatly enhances the hydrogen production while reducing the CO concentration.

AB - Thermodynamic analysis and experimental tests of glycerol steam reforming with/without calcium oxide (CaO) as a carbon dioxide (CO2) sorbent have been performed and compared in this work. Methanol, ethanol, acetaldehyde, acetone and ethylene do not exist in equilibrium conditions according to the equilibrium calculations. Without CaO present, thermodynamic predictions show that a maximum hydrogen concentration of 67% can be obtained at 925 K, with a water to glycerol ratio (WGR) of 9. In the experiments, the Ni/ZrO2 catalyst fails to catalyze the reactions to thermodynamic equilibrium under the selected conditions as the highest hydrogen concentration obtained is 64%. With the presence of CaO, thermodynamic analysis implies hydrogen purity exceeding 95% can be achieved below 925 K at WGRs of 6 and 9. However, CaCO3 does not exist at temperatures greater than 1025 K. In the experiments, a hydrogen purity of 95% with only 5% CH4 as impurity can be reached at 850 K with a WGR of 9. The Ni/ZrO2 catalyst is not active enough to convert excess CH4 to hydrogen in glycerol steam reforming as CH4 concentrations are usually higher than the equilibrium values. The addition of CaO to this system greatly enhances the hydrogen production while reducing the CO concentration.

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