Achieving carbon neutrality through CO 2 hydrogenation is critical for sustainable energy and chemical industries, where methanol production remains a key target. Despite existing catalysts, challenges persist in low CO 2 conversion, poor methanol selectivity, and activity instability. This study introduces a novel ternary Cu/Zn/Y catalyst synthesized via co-precipitation to address these limitations. Tested under 5 MPa, 250 °C, H 2 /CO 2 = 3:1, and 12,000 h⁻¹, the catalyst achieved a CO 2 conversion rate of 16.6% and a methanol selectivity of 56.6%, outperforming the CuZnAl benchmark with a 14.3% higher methanol space-time yield (402.3 mg/(gcat·h)). Optimal yttrium doping enhanced methanol selectivity by 20%, attributed to improved copper dispersion. However, excess Y occupancy disrupted Cu–Zn interactions, reducing CO 2 conversion and stability, highlighting critical trade-offs. These insight underscore the potential of Cu/Zn/Y catalysts for carbon-neutral technologies and emphasize the need for optimized Y doping to balance selectivity and stability. Graphical
Liang Wang,Anqi Liu,Zhaohui Zhang,Bin Zhao,Yingming Xia,Yun Tan
In this work, a novel catalyst of Fe 3 O 4 @SiO 2 @Yb 2 O 3 was prepared and the degradation of thymol in reverse osmosis concentrate using ozonation was explored. The operational parameters, such as ozone dosage (8–48 mg·min − 1 ), initial thymol concentration (20–100 mg·L − 1 ), initial pH value (3–11), and catalyst Fe 3 O 4 @SiO 2 @Yb 2 O 3 dosage (0.2–1.0 g), were studied focusing on the thymol degradation and COD removal. The results indicated that the increase in ozone dosage, initial pH value, and Fe 3 O 4 @SiO 2 @Yb 2 O 3 dosage accelerated the thymol degradation and COD removal, while the increase in initial thymol concentration hampered the effect of ozonation. A pathway of thymol degradation by catalytic ozonation was proposed based on the intermediates detected by gas chromatography-mass spectrometer and ion chromatography . This paper can provide basic data and technical alternative for pollutant removal from reverse osmosis concentrate by ozonation.
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