Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 838, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.156032
Keywords
Electroplating sludge; Carbon dioxide; Hydrogenation; Spinel; Heteroatom
Categories
Funding
- National key research and development program of China [2019YFC1906900]
- Introduced Jointed Research and Development Institution of Jiangxi [20203CCH45007]
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This study successfully synthesized spinel catalyst from electroplating sludge and utilized the transition metals and multi-hetero atoms for CO2 catalytic hydrogenation to produce CH3OH. Metal doping increased the CO2 conversion efficiency but decreased the CH3OH selectivity. Further doping of S significantly increased the CH3OH selectivity.
Electroplating sludge is a hazardous waste and its recycling is a hot topic. Electroplating sludge usually contains plenty of transition metals and multi-hetero atoms, which are potential resources. For the first time, this work synthesized spinel catalyst from Zn- and Cr-containing electroplating sludges by a simple calcination method, and applied the obtained catalysts in CH3OH production by CO2 catalytic hydrogenation. The spinel was doped by various heteroatoms, including Fe, Mn, Cu, and even S. According to detailed characterizations, the metal doping increased the low-temperature conversion efficiency of CO2 but decreased the CH3OH selectivity at the same time. After a further doping of S, although CO2 conversion efficiency was slightly decreased, the selectivity of CH3OH was significantly in-creased. After all, the optimized catalyst attained a conversion efficiency of 8.6% (CO2) as well as a selectivity of 73.3% (CH3OH) at 250 degrees C and 3 MPa. As a result, above results realized high-value-added utilization of hazardous waste and producing valuable product at the same time, which was in favor of circular development.
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