The amplification of ammonia by reaction with NO and CO over dual function platinum and palladium catalyst systems with isocyanic acid as an intermediate

Noel W. Cant; Dean C. Chambers; Irene O Y Liu

doi:10.1016/j.apcatb.2005.02.021

The amplification of ammonia by reaction with NO and CO over dual function platinum and palladium catalyst systems with isocyanic acid as an intermediate

Noel W. Cant, Dean C. Chambers, Irene O Y Liu

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

The hypothesis that ammonia concentrations can be amplified by reaction with NO in excess CO to form isocyanic acid (HNCO) which is then hydrolysed back to NH₃ has been tested. With 1000 ppm NO and 400 ppm NH₃ in 3400 ppm CO, the HNCO produced in a dry feed over Pd/SiO₂ and Pt/SiO₂ is sufficient to allow potential multiplications of 1.9 and 2.2, respectively. With Pt/SiO₂ a greater multiplication is possible if water is present since additional HNCO is formed using surface hydrogen generated by the water-gas shift reaction. Isocyanic acid is completely hydrolysed to NH₃ if oxides more active than silica are located downstream, or used to support the platinum group metal, provided excess water is present. An actual amplification of six has been demonstrated starting from 150 ppm NH₃ with CeO₂/SiO₂ downstream of Pt/SiO₂. With Pt/Al₂O₃, 300 ppm NH₃ can be multiplied by 3.6 in the temperature range 300-450°C.

Original language	English
Pages (from-to)	57-63
Number of pages	7
Journal	Applied Catalysis B: Environmental
Volume	60
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcatb.2005.02.021
Publication status	Published - 1 Sep 2005

Keywords

Ammonia amplification
CeO-SiO
Isocyanic acid hydrolysis
Isocyanic acid synthesis
NO reduction by CO
Pd/SiO
Pt/AlO
Pt/SiO

Access to Document

10.1016/j.apcatb.2005.02.021

Cite this

@article{63b4afa0e1e84af590fce1132de7a205,

title = "The amplification of ammonia by reaction with NO and CO over dual function platinum and palladium catalyst systems with isocyanic acid as an intermediate",

abstract = "The hypothesis that ammonia concentrations can be amplified by reaction with NO in excess CO to form isocyanic acid (HNCO) which is then hydrolysed back to NH3 has been tested. With 1000 ppm NO and 400 ppm NH3 in 3400 ppm CO, the HNCO produced in a dry feed over Pd/SiO2 and Pt/SiO2 is sufficient to allow potential multiplications of 1.9 and 2.2, respectively. With Pt/SiO2 a greater multiplication is possible if water is present since additional HNCO is formed using surface hydrogen generated by the water-gas shift reaction. Isocyanic acid is completely hydrolysed to NH3 if oxides more active than silica are located downstream, or used to support the platinum group metal, provided excess water is present. An actual amplification of six has been demonstrated starting from 150 ppm NH3 with CeO2/SiO2 downstream of Pt/SiO2. With Pt/Al2O3, 300 ppm NH3 can be multiplied by 3.6 in the temperature range 300-450°C.",

keywords = "Ammonia amplification, CeO-SiO, Isocyanic acid hydrolysis, Isocyanic acid synthesis, NO reduction by CO, Pd/SiO, Pt/AlO, Pt/SiO",

author = "Cant, {Noel W.} and Chambers, {Dean C.} and Liu, {Irene O Y}",

year = "2005",

month = sep,

day = "1",

doi = "10.1016/j.apcatb.2005.02.021",

language = "English",

volume = "60",

pages = "57--63",

journal = "Applied Catalysis B: Environmental",

issn = "0926-3373",

publisher = "Elsevier",

number = "1-2",

}

TY - JOUR

T1 - The amplification of ammonia by reaction with NO and CO over dual function platinum and palladium catalyst systems with isocyanic acid as an intermediate

AU - Cant, Noel W.

AU - Chambers, Dean C.

AU - Liu, Irene O Y

PY - 2005/9/1

Y1 - 2005/9/1

N2 - The hypothesis that ammonia concentrations can be amplified by reaction with NO in excess CO to form isocyanic acid (HNCO) which is then hydrolysed back to NH3 has been tested. With 1000 ppm NO and 400 ppm NH3 in 3400 ppm CO, the HNCO produced in a dry feed over Pd/SiO2 and Pt/SiO2 is sufficient to allow potential multiplications of 1.9 and 2.2, respectively. With Pt/SiO2 a greater multiplication is possible if water is present since additional HNCO is formed using surface hydrogen generated by the water-gas shift reaction. Isocyanic acid is completely hydrolysed to NH3 if oxides more active than silica are located downstream, or used to support the platinum group metal, provided excess water is present. An actual amplification of six has been demonstrated starting from 150 ppm NH3 with CeO2/SiO2 downstream of Pt/SiO2. With Pt/Al2O3, 300 ppm NH3 can be multiplied by 3.6 in the temperature range 300-450°C.

AB - The hypothesis that ammonia concentrations can be amplified by reaction with NO in excess CO to form isocyanic acid (HNCO) which is then hydrolysed back to NH3 has been tested. With 1000 ppm NO and 400 ppm NH3 in 3400 ppm CO, the HNCO produced in a dry feed over Pd/SiO2 and Pt/SiO2 is sufficient to allow potential multiplications of 1.9 and 2.2, respectively. With Pt/SiO2 a greater multiplication is possible if water is present since additional HNCO is formed using surface hydrogen generated by the water-gas shift reaction. Isocyanic acid is completely hydrolysed to NH3 if oxides more active than silica are located downstream, or used to support the platinum group metal, provided excess water is present. An actual amplification of six has been demonstrated starting from 150 ppm NH3 with CeO2/SiO2 downstream of Pt/SiO2. With Pt/Al2O3, 300 ppm NH3 can be multiplied by 3.6 in the temperature range 300-450°C.

KW - Ammonia amplification

KW - CeO-SiO

KW - Isocyanic acid hydrolysis

KW - Isocyanic acid synthesis

KW - NO reduction by CO

KW - Pd/SiO

KW - Pt/AlO

KW - Pt/SiO

UR - http://www.scopus.com/inward/record.url?scp=22344447718&partnerID=8YFLogxK

U2 - 10.1016/j.apcatb.2005.02.021

DO - 10.1016/j.apcatb.2005.02.021

M3 - Article

AN - SCOPUS:22344447718

VL - 60

SP - 57

EP - 63

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

SN - 0926-3373

IS - 1-2

ER -

The amplification of ammonia by reaction with NO and CO over dual function platinum and palladium catalyst systems with isocyanic acid as an intermediate

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this