Chemical Speciation of Nickel in Residual Oil Ash
| Autor: | Frank E. Huggins, Christopher J. Zygarlicke, John L. Wong, Gerald P. Huffman, Kevin C. Galbreath |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
chemistry.chemical_classification
Sulfide Chemistry General Chemical Engineering media_common.quotation_subject Metallurgy Residual oil Energy Engineering and Power Technology chemistry.chemical_element Fuel oil Combustion X-ray absorption fine structure Anodic stripping voltammetry Speciation Nickel Fuel Technology media_common Nuclear chemistry |
| Zdroj: | Energy & Fuels. 12:818-822 |
| ISSN: | 1520-5029 0887-0624 |
| DOI: | 10.1021/ef980030b |
| Popis: | The speciation of Ni emissions from residual oil-fired utility boilers requires investigation because the possible presence of small respirable particles containing Ni3S2 is a health concern. An experimental approach was used to investigate the Ni speciation of residual oil combustion ash. Ash from a low- and high-S (0.33 and 1.80 wt %, respectively) residual oil was produced using a 42-MJ/h combustion system at excess O2 concentrations of ≤1 and 2 or 3 mol %. Ni speciation analyses were performed using X-ray absorption fine-structure (XAFS) spectroscopy and sequential extraction−anodic stripping voltammetry (ASV). XAFS measurements indicate that >95% of the total Ni (3−9 wt %) present in the ashes occurs as Ni2+ coordinated to O2-. Both methods indicate that NiSO4 is the dominant form, although significant proportions of NiO (5−24%) were measured by sequential extraction−ASV. The sequential extraction−ASV method also indicated the presence of very small proportions |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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