Journal
APPLIED SURFACE SCIENCE
Volume 528, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.146969
Keywords
Electroplating sludge; NO removal; Spinel oxide; Computational catalyst design
Categories
Funding
- National Nature Science Foundation of China [21107067, 91641128]
- National Key Research and Development Program of China [2017YFB0702901, 2017YFB0701502]
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The hazardous electroplating sludge (ES) waste can be converted to metal oxide catalysts for pollution reduction. Combining the computational study with experimental verification, we converted the ES containing Ni, Cu, and Cr to spinel oxide catalysts for NO removal via selective catalysis reduction with NH3 (NH3-SCR), yielding > 96% NO removal at 200-300 degrees C. Then we investigated computationally the mechanisms of NH3-SCR for the two Cr-spinel oxides, showing the reaction barrier for CuCr2O4 is lower than NiCr2O4. Subsequent experiments supported the computation results: CuCr2O4 yielded 88% and NiCr2O4 achieved 60% NO removal at 225 degrees C. Compared with the two studied Cr-spinel oxides, the ES after calcination had a better removal effect and wider operating temperature window. This study provides atomistic insights into the catalytic mechanism of Cr-spinel oxides in NH3-SCR reactions, promoting the design of spinel oxide catalysts and the resource utilization of ES as a high value-added product from an environment engineering point of view.
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