Control of the Emission of Ammonia Through the Adsorption in Activated Coal

Rodrigues, Christiano Cantarelli; Coutinho, Aparecido dos Reis; Lia, Luís Bastos; Silva, Edson Luiz; Moraes, Deovaldo de

doi:10.4271/1999-01-3044

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Bernal and Lopez-Real (1993), Turner et al (1994), Saiki et al (1994), El-Nabarawy et al (1997), Rodrigues et al (1999) and Veiga (1995). These studies have attempted to assess the influence and importance of the several variables involved in the efficient removal of this pollutant.…”

Section: Introductionmentioning

confidence: 99%

Control of the Emission of Ammonia through Adsorption in a Fixed Bed of Activated Carbon

Rodrigues

Moraes

2002

Adsorption Science & Technology

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ABSTRACT:The increase in atmospheric pollution caused by polluting gases has made it necessary to conduct studies aimed at decreasing or treating the emissions of such gases. Due to its increasing presence in the atmosphere, ammonia is one of the most pre-eminent of these. The present work studied the control of the emission of this gas through its adsorption in a fixed bed of activated carbon. The results showed that the adsorption capacity increased from approximately 0.2 to 1.9 mg NH 3 /g carbon as the concentration of ammonia in the gaseous mixture increased (600, 1200, 1800 and 2400 ppm) at the three temperatures employed (40, 80 and 120ºC). Increasing the temperature at the concentrations studied caused a decrease in the adsorption capacity, which was affected to a more significant extent by temperature than by the ammonia concentration in the gaseous mixture.

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Section: Introductionmentioning

confidence: 99%

Control of the Emission of Ammonia through Adsorption in a Fixed Bed of Activated Carbon

Rodrigues

Moraes

2002

Adsorption Science & Technology

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Multifunctional Eco-Friendly Adsorbent Cryogels Based on Xylan Derived from Coffee Residues

Quintero,

Osma,

Azimov

et al. 2024

Membranes

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Agricultural and animal farming practices contribute significantly to greenhouse gas (GHG) emissions such as NH3, CH4, CO2, and NOx, causing local environmental concerns involving health risks and water/air pollution. A growing need to capture these pollutants is leading to the development of new strategies, including the use of solid adsorbents. However, commonly used adsorbent materials often pose toxicity and negative long-term environmental effects. This study aimed to develop responsive eco-friendly cryogels using xylan extracted from coffee parchment, a typical residue from coffee production. The crosslinking in cryogels was accomplished by “freeze-thawing” and subsequent freeze-drying. Cryogels were characterized in terms of morphology by using scanning electron microscopy, porosity, and density by the liquid saturation method and also moisture adsorption and ammonia adsorption capacity. The analysis showed that the porosity in the cryogels remained around 0.62–0.42, while the apparent densities varied from 0.14 g/cm3 to 0.25 g/cm3. The moisture adsorption capacity was the highest at the highest relative humidity level (80%), reaching 0.25–0.43 g of water per gram of sample; the amount of water adsorbed increased when the xylan content in the cryogel increased up to 10% w/v, which was consistent with the hygroscopic nature of xylan. The ammonia adsorption process was modeled accurately by a pseudo-second-order equation, where the maximum adsorption capacity in equilibrium reached 0.047 mg NH3/g when xylan reached 10% w/v in cryogels, indicating a chemisorption process. The cryogels under investigation hold promise for ammonia adsorption applications and GHG separation, offering a sustainable alternative for gas-capturing processes.

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Control of the Emission of Ammonia Through the Adsorption in Activated Coal

Cited by 2 publications

References 4 publications

Control of the Emission of Ammonia through Adsorption in a Fixed Bed of Activated Carbon

Control of the Emission of Ammonia through Adsorption in a Fixed Bed of Activated Carbon

Multifunctional Eco-Friendly Adsorbent Cryogels Based on Xylan Derived from Coffee Residues

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