期刊
PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 38, 期 1, 页码 1859-1866出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2020.10.004
关键词
Soot; Additive; Palladium acetylacetonate; Small-angle X-ray scattering
资金
- National Natural Science Foundation of China [91641125, 71690245]
- U.S. Department of Energy (DOE), Office of Science User Facility [DE-AC02-06CH11357]
The study investigates the impact of Pd(acac)(2) on soot formation and growth, revealing that low concentrations suppress primary soot particles while higher concentrations have varying effects on soot particle size and volume fractions at different flame regions.
Organo-Pd compounds as fuel additives are proven to have distinct catalytic effects on enhancing ignition and combustion performance. However, their effects on soot emission and the mechanism are not well-established. In this study, the effect of palladium acetylacetonate (Pd(C5H7O2)(2), Pd(acac)(2)) on soot formation and growth was investigated experimentally. Different concentrations of Pd(acac)(2) were added in the ethylene flames. Synchrotron small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) were used to detect the soot particles to obtain the size, shape and morphology information. The results show that the Pd(acac)(2) addition with low concentration (100 ppm) suppresses the formation and growth of the primary soot particles at each height above the burner. As the addition concentration increases to 200 and 300 ppm, the size and volume fraction of the soot particles are decreased at the low flame region, and increased at the high flame region. Detailed size distribution, morphology and nanostructure information of the soot particles at different flame heights are discussed. (c) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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