Heterogeneous fixation of N2: Investigation of a novel mechanism for formation of NO

Zheng, Ying; Jensen, Anker Degn; Glarborg, Peter; Sendt, Karina; Haynes, Brian S.

doi:10.1016/j.proci.2008.06.187

Cited by 12 publications

(8 citation statements)

References 22 publications

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“…Cellulose is in powder fibrous form, and lignin is alkali lignin in brown powders. A commercial hemicellulose can hardly be purchased whereas xylan, although it might have different physical and chemical properties, has been widely used as a representative component of hemicellulose in pyrolysis processes [20][21][22]. Here, xylan processed from Birchwood, in yellow powder form, was used as hemicellulose.…”

Section: Methodsmentioning

confidence: 99%

NO and N2O precursors (NH3 and HCN) from biomass pyrolysis: Co-pyrolysis of amino acids and cellulose, hemicellulose and lignin

Ren

Zhao

Chen

et al. 2011

Proceedings of the Combustion Institute

139

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Section: Methodsmentioning

confidence: 99%

NO and N2O precursors (NH3 and HCN) from biomass pyrolysis: Co-pyrolysis of amino acids and cellulose, hemicellulose and lignin

Ren

Zhao

Chen

et al. 2011

Proceedings of the Combustion Institute

139

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“…S15). It appears unlikely that these sites belong to the catalyst and may rather constitute the release of NH3 that was bound by coke species [53,54].…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Catalytic conversion of acetol over HZSM-5 catalysts – influence of Si/Al ratio and introduction of mesoporosity

2021

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“…To determine the chemical composition of the char used in the experiments, 2 g samples were pyrolyzed in nitrogen in a horizontal laboratory-scale tube reactor placed in an electrically heated three-zone furnace (inner diameter = 8 cm, length = 95 cm), described in detail elsewhere. , Once the oven reached the desired temperature, 2 NL/min of nitrogen was used to purge the air for 10 min to create an inert atmosphere. Then the alumina crucible and the sample were pushed into the reactor rapidly.…”

Section: Experimental Sectionmentioning

confidence: 99%

NO Formation during Oxy-Fuel Combustion of Coal and Biomass Chars

2014

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The yields of NO from combustion of bituminous coal, lignite, and biomass chars were investigated in O 2 /N 2 and O 2 /CO 2 atmospheres. The experiments were performed in a laboratory-scale fixed-bed reactor in the temperature range of 850− 1150 °C. To minimize thermal deactivation during char preparation, the chars were generated by in situ pyrolysis at the reaction temperature. The NO yield clearly decreased and the CO yield increased when the atmosphere was altered from O 2 /N 2 to O 2 /CO 2 at 850 °C, but only small differences in NO and CO yields were observed between the two atmospheres at 1050−1150 °C. To examine how CO influences the NO yield, the effect of CO on NO reduction over char as well as NO reduction by CO over ash was investigated in the fixed-bed reactor. Furthermore, the influence of CO on the homogeneous oxidation of HCN, possibly a product of the char-N oxidation, was evaluated using a detailed chemical kinetic model. The results indicate that CO influences the NO yield from char combustion through two paths at 850 °C: (1) CO accelerates NO reduction over char and (2) CO accelerates HCN oxidation, increasing the possibility of NO reduction over char. Both effects were more pronounced at 850 °C than at 1050−1150 °C. The present work indicates that the effect of CO 2 on NO formation in oxy-fuel combustion in fluidized beds can partly be attributed to heterogeneous reactions, whereas for high-temperature pulverized fuel combustion, CO 2 mainly affects the volatile chemistry.

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Heterogeneous fixation of N2: Investigation of a novel mechanism for formation of NO

Cited by 12 publications

References 22 publications

NO and N2O precursors (NH3 and HCN) from biomass pyrolysis: Co-pyrolysis of amino acids and cellulose, hemicellulose and lignin

NO and N2O precursors (NH3 and HCN) from biomass pyrolysis: Co-pyrolysis of amino acids and cellulose, hemicellulose and lignin

Catalytic conversion of acetol over HZSM-5 catalysts – influence of Si/Al ratio and introduction of mesoporosity

NO Formation during Oxy-Fuel Combustion of Coal and Biomass Chars

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