Ammonia decomposition in coal gasification atmospheres

Chambers, Allan; Yoshii, Yasuo; Inada, Tooru; Miyamoto, Tomohiko

doi:10.1002/cjce.5450740616

Cited by 19 publications

(14 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The presence of NH 3 in a gas stream can also be undesirable, as for example in the gas produced by the gasification of coal, and high NO x emissions can occur when the gas is burned in a gas turbine. In this sense, Chambers et al 117 studied the use of CaO to clean the hot gas stream produced in the gasification of coal by decomposing the NH 3 present. The same phenomenon occurs in biomass gasification; Wang et al 118 studied nickel as catalyst for the decomposition reaction of ammonia for its removal in a wide range of temperatures (between 200 and 1000 °C) at a pressure of 21 bar.…”

Section: Energy Supply Methodsmentioning

confidence: 99%

Review of the Decomposition of Ammonia to Generate Hydrogen

Lucentini

Garcia

Vendrell

et al. 2021

Ind. Eng. Chem. Res.

301

193

View full text Add to dashboard Cite

Because of the problems associated with the generation and storage of hydrogen in portable applications, the use of ammonia has been proposed for on-site production of hydrogen through ammonia decomposition. First, an analysis of the existing systems for ammonia decomposition and the challenges for this technology are presented. Then, the state of the art of the catalysts used to date for ammonia decomposition is described considering the catalysts composed of noble and non-noble metals and their combinations, as well as novel materials such as alkali metal amides and imides. The effect of the supports and promoters used is analyzed in detail, and the catalytic activity obtained is compared. An analysis of the kinetics of the reaction obtained with different catalysts is also presented and discussed, including the reaction mechanism, the determining step of the reaction, and the apparent activation energy. Finally, the structured reactors used to date for the decomposition reaction of ammonia are explored, as well as the possibilities offered by catalytic membrane reactors, which allow the on-site simultaneous production and separation of hydrogen.

show abstract

Section: Energy Supply Methodsmentioning

confidence: 99%

Review of the Decomposition of Ammonia to Generate Hydrogen

Lucentini

Garcia

Vendrell

et al. 2021

Ind. Eng. Chem. Res.

301

193

View full text Add to dashboard Cite

show abstract

“…A field where ammonia decomposition could become much more important in the future is clean-up of coal or biomass derived fuel gas. [14][15][16][17] In coal or biomass gasification, for instance for an internal gasification combined cycle (IGCC) power plant, a fuel gas is produced. Nitrogen compounds in the coal or the biomass (typically 0.5-2% of N) are to a large extent converted to ammonia in the gasification process, and removal of this ammonia (typical concentration levels of 0.5%) is advantageous, before the fuel gas is further processed.…”

Section: The Ammonia Decomposition As a Key Stepmentioning

confidence: 99%

Ammonia as a possible element in an energy infrastructure: catalysts for ammonia decomposition

Schüth

Palkovits

Schlögl

et al. 2012

Energy Environ. Sci.

650

377

View full text Add to dashboard Cite

show abstract

“…The increased concentration of ammonia in the biogas could contribute to corrosion and also could increase NOx emissions during combustion of the biogas (Chambers, Yoshii, Inada, & Miyamoto, 1996;Hasegawa, 2010). This factor has not been reported or discussed in the literature and is in need of further research but could be important as many plants in the United States have limits on NOx emission.…”

Section: Research Implicationsmentioning

confidence: 99%

Impacts of feed dilution and lower solids retention time on performance of thermal hydrolysis/anaerobic digestion

Higgins

Beightol

DeBarbidillo

et al. 2019

Water Environment Research

View full text Add to dashboard Cite

The goal of this study was to evaluate using feed dilution/solids retention time (SRT) control to manage potential ammonia inhibition in highly loaded anaerobic digesters after thermal hydrolysis. The study compared three digesters operated at the same target volatile solids (VS) loading rate of 5.5 kg VS/d‐m3, but at different feed concentrations resulting in SRTs of 10, 15, and 18 days. Lowering the feed concentration decreased the digester total ammonia nitrogen concentrations which averaged 1,580, 2,610, and 3,080 mg NH4+ ‐N/L for the 10‐, 15‐, and 18‐day digesters. The VS reduction and methane yields were equivalent for the 15‐ and 18‐day digesters and about 4% lower for the 10‐day digester. Ammonia inhibition of the 18‐day digester occurred early in the study, but the system acclimated over time. Feed dilution reduced the viscosity and the potential for volume expansion due to gas holdup and foaming. Practioner points Feed dilution reduces digester ammonia concentrations and inhibition potential without sacrificing digester performance at lower SRTs. Feed dilution greatly reduces digester viscosity and associated issues with digester volume expansion due to gas holdup and foaming. Operating at the lower SRT does not impact cake solids after dewatering and substantially decreases polymer demand for conditioning.

show abstract

Ammonia decomposition in coal gasification atmospheres

Cited by 19 publications

References 10 publications

Review of the Decomposition of Ammonia to Generate Hydrogen

Review of the Decomposition of Ammonia to Generate Hydrogen

Ammonia as a possible element in an energy infrastructure: catalysts for ammonia decomposition

Impacts of feed dilution and lower solids retention time on performance of thermal hydrolysis/anaerobic digestion

Contact Info

Product

Resources

About