Ammonia: a reactive medium for catalysed coal gasification

Bota, Kofi B.; Abotsi, G.M.K.

doi:10.1016/0016-2361(94)90313-1

Cited by 31 publications

(12 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen from the isotherms that amination has caused the porous structure of the char to develop by partial gasification. Ammonia is known to decompose at high temperatures producing atomic H and NH 2 and NH radicals that react with the carbon releasing gaseous H 2 , CH 4 , HCN and (CN) 2 [14,18]. The gasification becomes more important as the temperature increases, producing a continuous increase in the BET surface area and in the total pore volume.…”

Section: Characterisation Of the Aminated Samplesmentioning

confidence: 99%

See 1 more Smart Citation

Development of low-cost biomass-based adsorbents for postcombustion CO2 capture

Plaza

Pevida

Arias

et al. 2009

Fuel

193

109

View full text Add to dashboard Cite

In this work a series of carbon adsorbents were prepared from a low-cost biomass residue, olive stones. Two different approaches were studied: activation with CO 2 and heat treatment with gaseous ammonia. The results showed that both methods are suitable for the production of adsorbents with a high CO 2 adsorption capacity, and their potential application in VSA or TSA systems for postcombustion CO 2 capture. It was found that the presence of nitrogen functionalities enhances CO 2 adsorption capacity, especially at low partial pressures.

show abstract

Section: Characterisation Of the Aminated Samplesmentioning

confidence: 99%

“…Attention has also been given to the introduction of nitrogen functionalities into the carbon in order to enhance CO 2 adsorption capacity [7][8][9][10][11][12][13]. Other possibilities include the introduction of nitrogen into the carbon matrix by reaction with gaseous ammonia at high temperatures [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Development of low-cost biomass-based adsorbents for postcombustion CO2 capture

Plaza

Pevida

Arias

et al. 2009

Fuel

193

109

View full text Add to dashboard Cite

show abstract

“…On the other hand, AN800 is a highly microporous carbon with slightly wider micropores, accessible to N 2 at -196 ºC. Ammonia is known to decompose at high temperatures, producing atomic H and NH 2 and NH free radicals that react with the carbon releasing gaseous H 2 , CH 4 , HCN and (CN) 2 [13,17], developing the narrow microporosity of the char. increases.…”

Section: Textural Characterisationmentioning

confidence: 99%

“…Among other possibilities, nitrogen can be introduced into the carbon matrix by reaction with gaseous ammonia [13][14][15][16][17][18][19]. Ammonia can react with surface oxides and active sites present at the edges of the graphene layers to form amines, amides, imides, lactams, nitriles, pyridine-or pyrrole-like functionalities [14,15,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Developing almond shell-derived activated carbons as CO2 adsorbents

Plaza

Pevida

Martín

et al. 2010

Separation and Purification Technology

190

View full text Add to dashboard Cite

Two series of carbon dioxide adsorbents were prepared from almond shells, by carbonisation followed either by activation with CO 2 or by heat treatment in the presence of ammonia gas (amination). Both procedures gave carbons with high CO 2 adsorption capacities in pure CO 2 as well as in a binary mixture of 15 % CO 2 in N 2 .Activation with carbon dioxide significantly developed porosity in the samples, mostly in the micropore domain, while amination at 800 ºC moderately developed narrow microporosity in the char and incorporated stable nitrogen functionalities, which enhanced CO 2 selectivity. Amination showed two additional advantages over conventional activation with CO 2 : a greater carbon yield and a shorter soaking time.

show abstract

“…The differences in nitrogen content between the NORF700 and NRF700 samples indicates that the presence of oxygen functionalities on the carbon surface before amination plays an important role in determining the degree of nitrogen incorporation into the surface, and that the pre-oxidation of carbons considerably enhances nitrogen incorporation during (Table 2). It has been reported that the free radicals (such as NH 2 , NH, and atomic hydrogen) created during ammonia decomposition may attach to the surface oxides or active sites present on the carbon surface to form nitrogen-containing functional groups (Stöhr et al, 1991;Bota and Abotsi, 1994;Vinke et al, 1994). Temperature also influences the amount of nitrogen incorporated into the carbon surface.…”

Section: Nitrogen Content and Type Of Nitrogen-containing Functionalimentioning

confidence: 99%

Facile Preparation of Nitrogen-Doped Activated Carbon for Carbon Dioxide Adsorption

Chen

Peng

Lin

et al. 2014

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

Nitrogen-doped activated carbons with high surface areas obtained from resorcinol and formaldehyde resins were evaluated as CO 2 adsorbents in a simulated flue gas stream under anhydrous and humid conditions. These carbons were prepared using two approaches, namely ammonia treatment without nitric acid pre-oxidation and amination after preoxidation. The pre-oxidation of activated carbons considerably enhanced the nitrogen incorporation during the amination process. The amination temperature affects the content and type of nitrogen incorporated onto the carbon surface, as determined by X-ray photoelectron spectroscopy, which enhances the specific adsorbent-adsorbate interaction for CO 2 in humid conditions. The presence of H 2 O in the feed gas significantly decreased CO 2 adsorption for a very low nitrogen content of virgin activated carbon. A sample prepared via the amination of pre-oxidized carbon at 700°C (NORF700) exhibited excellent tolerance to moisture and the highest CO 2 capacity of 2.10 mmol/g in a 7% CO 2 /83% N 2 /10% H 2 O wet stream at 50°C and 130 kPa. The high performance of NORF700 was ascribed to its high surface area, adequate micropore volume, and high amounts of pyrindinic-like and pyrrole-like nitrogen species. The results indicate that nitric acid preoxidation followed by ammonia treatment at 700°C is an appropriate process for preparing adsorbents for CO 2 separation in post-combustion applications.

show abstract

Ammonia: a reactive medium for catalysed coal gasification

Cited by 31 publications

References 19 publications

Development of low-cost biomass-based adsorbents for postcombustion CO2 capture

Development of low-cost biomass-based adsorbents for postcombustion CO2 capture

Developing almond shell-derived activated carbons as CO2 adsorbents

Facile Preparation of Nitrogen-Doped Activated Carbon for Carbon Dioxide Adsorption

Contact Info

Product

Resources

About