Low-cost carbon-based briquettes for the reduction of NO emissions: Optimal preparation procedure and influence in operating conditions
✍ Scribed by M.E. Gálvez; A. Boyano; R. Moliner; M.J. Lázaro
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 866 KB
- Volume
- 88
- Category
- Article
- ISSN
- 0165-2370
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✦ Synopsis
Catalytic briquettes were prepared using a low-rank coal as carbon precursor and vanadium compounds, i.e. V 2 O 5 and petroleum coke ash (PCA), as the source of the active phase. The catalytic briquettes presented herein offer a feasible low-cost possibility for flue gas cleaning in medium and small industrial facilities. For their preparation, coal was first pyrolysed, then blended with tar pitch and cold pressed to produce the cylindrical briquettes. Pressed briquettes were submitted then to pyrolysis and activation in the presence of steam or CO 2 , at different temperatures and residence times. Activated briquettes were functionalized by means of HNO 3 and H 2 SO 4 -wet oxidation. Physical and chemical properties of the produced briquettes were evaluated using N 2 adsorption, Raman spectroscopy, temperature programmed desorption (TPD), photoelectron spectroscopy (XPS) and NH 3 chemisorption. Important mechanical properties such as Impact Resistance Index (IRI) and Water Resistance Index (WRI) were also determined for this series of briquettes. Briquettes showed considerable activity in the SCR of NO in a wide temperature range (75-350 • C) and high selectivity towards N 2 . The several steps involved in the preparation of the catalytic briquettes influence both their structural-chemical and mechanical properties, as well as their catalytic activity in the SCR of NO. Thus, the evaluation of these parameters was found to be crucial for future scale-up and applications.