2022
DOI: 10.1021/acs.est.1c05516
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Green and Moderate Activation of Coal Fly Ash and Its Application in Selective Catalytic Reduction of NO with NH3

Abstract: Coal fly ash (CFA) is an ideal source for the preparation of heterogeneous catalysts due to its abundant silicon and aluminum oxides, but its activity needs to be improved. In this study, a green and moderate approach for CFA activation was proposed, and a series of CFA-based catalysts were prepared for NO selective catalytic reduction (SCR). The results indicated that CFA could be well activated via mechanochemical activation with 3 h of milling duration in 1 mol/L of acetic acid, and 90% of NO removal was ac… Show more

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Cited by 26 publications
(5 citation statements)
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“…Besides, there was a satellite peak of Ni 2+ located at 860.0 eV. , With the addition of the Fe promoter, the peak ascribed to Ni 0 shifted to a higher binding energy zone, due to the electron transfer from Ni to Fe in Ni–Fe alloys, which weakened the reduction of Ni species in the catalysts. The chemical states of Fe species are given in Figure b, and three peaks were detected at 706.0, 710.0, and 712.0 eV over the 10Ni–5Fe/TiO 2 catalyst, which were assigned to Fe0, Fe 2+ , and Fe 3+ respectively. , As the content of the Fe promoter increased from 5.0 to 15.0 wt %, the peak ascribed to Fe 0 shifted to the lower binding energy zone. Moreover, owing to the excessive loading, partial Fe species could not react with Ni components to form Ni–Fe alloys, causing the appearance of another new peak assigned to Fe 0 at 706.5 eV.…”
Section: Resultsmentioning
confidence: 98%
See 1 more Smart Citation
“…Besides, there was a satellite peak of Ni 2+ located at 860.0 eV. , With the addition of the Fe promoter, the peak ascribed to Ni 0 shifted to a higher binding energy zone, due to the electron transfer from Ni to Fe in Ni–Fe alloys, which weakened the reduction of Ni species in the catalysts. The chemical states of Fe species are given in Figure b, and three peaks were detected at 706.0, 710.0, and 712.0 eV over the 10Ni–5Fe/TiO 2 catalyst, which were assigned to Fe0, Fe 2+ , and Fe 3+ respectively. , As the content of the Fe promoter increased from 5.0 to 15.0 wt %, the peak ascribed to Fe 0 shifted to the lower binding energy zone. Moreover, owing to the excessive loading, partial Fe species could not react with Ni components to form Ni–Fe alloys, causing the appearance of another new peak assigned to Fe 0 at 706.5 eV.…”
Section: Resultsmentioning
confidence: 98%
“…The chemical states of Fe species are given in Figure 4b, and three peaks were detected at 706.0, 710.0, and 712.0 eV over the 10Ni−5Fe/TiO 2 catalyst, which were assigned to Fe0, Fe 2+ , and Fe 3+ respectively. 26,32 As the content of the Fe promoter increased from 5.0 to 15.0 wt %, the peak ascribed to Fe 0 shifted to the lower binding energy zone. Moreover, owing to the excessive loading, partial Fe species could not react with Ni components to form Ni−Fe alloys, causing the appearance of another new peak assigned to Fe 0 at 706.5 eV.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…Elevated levels of Fe 3+ and surface chemisorbed oxygen will accelerate the process of converting NO to NO 2 , hence stimulating the fast reaction process. 63 NO oxidation ability over Cu/γ-Fe and Sn/γ-Fe is indeed significantly accelerated and more NO 2 can be formed, enhancing the catalysts’ activity via the fast SCR reaction.…”
Section: Resultsmentioning
confidence: 99%
“…Most of the above studies have focused on the effects of CFA and its main components on SNCR denitration, with little consideration given to modifying CFA to enhance its catalytic ability for NH 3 and NO at high temperatures. The transformation of NH 3 on the material surface depends largely on the transformation of intermediates after surface adsorption, which is mainly influenced by the nature and distribution of active sites. , Therefore, it is essential to disrupt the stable shell through acid–base modification, where HCl and NH 4 HSO 4 are commonly used for dissolving Al, and NaOH and Na 2 CO 3 are used for extracting Si. Furthermore, although the metal oxides in CFA originally have catalytic potential, conventional activation techniques usually remove them as impurities and fail to fully utilize the catalytic effect of CFA. Consequently, it is essential to modify CFA economically and efficiently to provide novel ideas for its high-value utilization.…”
Section: Introductionmentioning
confidence: 99%