Synthesis of ammonia directly from wet air using new perovskite oxide La0.8Cs0.2Fe0.8Ni0.2O 3-δ as catalyst

Rong Lan, Khaled A. Alkhazmi, Ibrahim Ali Ahmed Amar, Shanwen Tao

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Single phase perovskite oxide La0.8Cs0.2Fe 0.8Ni0.2O3-δ was synthesised to be used as electrocatalyst for electrochemical synthesis of ammonia directly from wet air. It exhibits an orthorhombic structure with space group Pnma(62); a = 5.5493(5) Å, b = 7.8352(10) Å, c = 5. 5295(5) Å, V = 240.42(4) Å3. Composite made of Ce0.8Gd0.2O 2-δ (CGO) and (Li,Na,K)2CO3 was used as electrolyte. An ammonia formation rate of 9.21 × 10-7 mol s-1 m-2 was obtained at 400 C when applied a voltage of 1.4 V, while wet air (3 mol% H2O) was introduced to the single chamber reactor. This is just slightly lower than the value of 1.23 × 10-6 mol s-1 m-2 when wet N2 (3 mol% H2O) was fed under the same experimental conditions. These values are more than two orders of magnitude higher than the reported ammonia formation rates when synthesised from N2 and H2O at ∼ 600°C. The perovskite catalyst is also low cost compared to the Ru/MgO and Pt/C catalysts in previous reports. This experiment indicates that ammonia can be directly synthesised from wet air using low-cost catalysts. This is a very promising simple technology for sustainable synthesis of ammonia in the future.

LanguageEnglish
Pages582–587
Number of pages6
JournalElectrochimica Acta
Volume123
DOIs
Publication statusPublished - 20 Mar 2014

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Ammonia
Perovskite
Oxides
Catalysts
Air
Electrocatalysts
Electrolytes
Costs
perovskite
Composite materials
Electric potential
Experiments

Keywords

  • electrochemical synthesis
  • ammonia
  • air
  • water
  • intermediate temperature

Cite this

Lan, Rong ; Alkhazmi, Khaled A. ; Amar, Ibrahim Ali Ahmed ; Tao, Shanwen. / Synthesis of ammonia directly from wet air using new perovskite oxide La0.8Cs0.2Fe0.8Ni0.2O 3-δ as catalyst. In: Electrochimica Acta. 2014 ; Vol. 123. pp. 582–587.
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abstract = "Single phase perovskite oxide La0.8Cs0.2Fe 0.8Ni0.2O3-δ was synthesised to be used as electrocatalyst for electrochemical synthesis of ammonia directly from wet air. It exhibits an orthorhombic structure with space group Pnma(62); a = 5.5493(5) {\AA}, b = 7.8352(10) {\AA}, c = 5. 5295(5) {\AA}, V = 240.42(4) {\AA}3. Composite made of Ce0.8Gd0.2O 2-δ (CGO) and (Li,Na,K)2CO3 was used as electrolyte. An ammonia formation rate of 9.21 × 10-7 mol s-1 m-2 was obtained at 400 C when applied a voltage of 1.4 V, while wet air (3 mol{\%} H2O) was introduced to the single chamber reactor. This is just slightly lower than the value of 1.23 × 10-6 mol s-1 m-2 when wet N2 (3 mol{\%} H2O) was fed under the same experimental conditions. These values are more than two orders of magnitude higher than the reported ammonia formation rates when synthesised from N2 and H2O at ∼ 600°C. The perovskite catalyst is also low cost compared to the Ru/MgO and Pt/C catalysts in previous reports. This experiment indicates that ammonia can be directly synthesised from wet air using low-cost catalysts. This is a very promising simple technology for sustainable synthesis of ammonia in the future.",
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Synthesis of ammonia directly from wet air using new perovskite oxide La0.8Cs0.2Fe0.8Ni0.2O 3-δ as catalyst. / Lan, Rong; Alkhazmi, Khaled A.; Amar, Ibrahim Ali Ahmed; Tao, Shanwen.

In: Electrochimica Acta, Vol. 123, 20.03.2014, p. 582–587.

Research output: Contribution to journalArticle

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T1 - Synthesis of ammonia directly from wet air using new perovskite oxide La0.8Cs0.2Fe0.8Ni0.2O 3-δ as catalyst

AU - Lan, Rong

AU - Alkhazmi, Khaled A.

AU - Amar, Ibrahim Ali Ahmed

AU - Tao, Shanwen

PY - 2014/3/20

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N2 - Single phase perovskite oxide La0.8Cs0.2Fe 0.8Ni0.2O3-δ was synthesised to be used as electrocatalyst for electrochemical synthesis of ammonia directly from wet air. It exhibits an orthorhombic structure with space group Pnma(62); a = 5.5493(5) Å, b = 7.8352(10) Å, c = 5. 5295(5) Å, V = 240.42(4) Å3. Composite made of Ce0.8Gd0.2O 2-δ (CGO) and (Li,Na,K)2CO3 was used as electrolyte. An ammonia formation rate of 9.21 × 10-7 mol s-1 m-2 was obtained at 400 C when applied a voltage of 1.4 V, while wet air (3 mol% H2O) was introduced to the single chamber reactor. This is just slightly lower than the value of 1.23 × 10-6 mol s-1 m-2 when wet N2 (3 mol% H2O) was fed under the same experimental conditions. These values are more than two orders of magnitude higher than the reported ammonia formation rates when synthesised from N2 and H2O at ∼ 600°C. The perovskite catalyst is also low cost compared to the Ru/MgO and Pt/C catalysts in previous reports. This experiment indicates that ammonia can be directly synthesised from wet air using low-cost catalysts. This is a very promising simple technology for sustainable synthesis of ammonia in the future.

AB - Single phase perovskite oxide La0.8Cs0.2Fe 0.8Ni0.2O3-δ was synthesised to be used as electrocatalyst for electrochemical synthesis of ammonia directly from wet air. It exhibits an orthorhombic structure with space group Pnma(62); a = 5.5493(5) Å, b = 7.8352(10) Å, c = 5. 5295(5) Å, V = 240.42(4) Å3. Composite made of Ce0.8Gd0.2O 2-δ (CGO) and (Li,Na,K)2CO3 was used as electrolyte. An ammonia formation rate of 9.21 × 10-7 mol s-1 m-2 was obtained at 400 C when applied a voltage of 1.4 V, while wet air (3 mol% H2O) was introduced to the single chamber reactor. This is just slightly lower than the value of 1.23 × 10-6 mol s-1 m-2 when wet N2 (3 mol% H2O) was fed under the same experimental conditions. These values are more than two orders of magnitude higher than the reported ammonia formation rates when synthesised from N2 and H2O at ∼ 600°C. The perovskite catalyst is also low cost compared to the Ru/MgO and Pt/C catalysts in previous reports. This experiment indicates that ammonia can be directly synthesised from wet air using low-cost catalysts. This is a very promising simple technology for sustainable synthesis of ammonia in the future.

KW - electrochemical synthesis

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