The conversion of CO₂ to dimethyl carbonate (DMC) represents a promising route for sustainable synthesis and carbon resource utilization. In this study, a series of Zr-doped CeO₂ catalysts derived from metal–organic frameworks (MOFs) via hydrothermal synthesis were applied to the direct synthesis of DMC from CO₂ and CH₃OH. The effects of varying Zr doping levels (molar fraction, the same below) on catalytic performance were systematically investigated, and the optimal Zr doping amount was determined. The catalysts were characterized using X-ray diffraction, high-resolution transmission electron microscopy, N₂ adsorption-desorption, and X-ray photoelectron spectroscopy to elucidate their crystal phase, morphology, surface chemical states, and correlations between these properties and catalytic activity. Using the Zr/CeO? catalyst with a 2% Zr doping level, the optimal process conditions for DMC synthesis from CO? and CH?OH were investigated. The results indicate that under the conditions of 140 °C, an initial CO₂ pressure of 3 MPa, and a reaction time of 2 hours, the Zr/CeO₂ catalyst with a 2% Zr doping content exhibits the highest CH₃OH conversion rate and DMC production.

For the deep removal of CO from hydrogen-rich gas,the preparation of catalysts with better CO-Prox catalytic performance is a current research hotspot.CuO/NiO-CeO₂ catalysts were prepared by stepwise impregnation method,and the catalysts were characterized by XRD,BET,H₂-TPR and HR-TEM to investigate the effects of molar loading of metal Cu+Ni (metal loading) on the catalysts' structure,reduction properties and their CO-Prox performance.The results showed that Cu/Ni-O-Ce solid solutions were all formed in CuO/NiO-CeO₂ catalysts.The catalytic activity is mainly related to the content of Cu species highly dispersed on the carrier surface as well as to the content of the solid solution.Among them,the catalyst with a metal loading of 8% had a higher content of Cu species highly dispersed on the carrier surface and a higher content of solid solutions,and the catalyst exhibited better catalytic activity.Under the CO/H₂/CO₂/O₂/Ar atmosphere,a reaction temperature of 130 °C,an oxygen excess coefficient of 1.2,and a mass-air velocity of 20 266 mL/（g·h）,the CO conversion was 95.9%,and the CO oxidation selectivity was 86.3%.

In order to understand the temperature characteristic of complex modulus,the correlation between the double logarithms of complex modulus and expressions at different temperatures was studied through ten original asphalts produced by two kinds of crude oil as well as these asphalts after RTFOT and PAV.For the first time,through correlation between the slope and intercept of linear fitting correlation,the optimized mathematics formulas between complex modulus and temperature were determined. Mathematics models for different aging stages were established. Mathematics models are simple,accurate,and practical and show universal applicability by comparing measured data at single temperature with predicted data of three asphalts produced by the third crude oil.The data predicted by mathematics model meet the requirements of reproducibility precision of the test method of complex modulus.