Preparation of Supported Copper Based Catalysts and Its Application in Coupling Process of 2-Butanol Dehydrogenation and Furfural Hydrogenation

采用不同方法制备了一系列的负载型铜基催化剂并将其用于仲丁醇脱氢和糠醛加氢的耦合反应.重点研究了助催化剂和硅源对催化剂活性的影响,发现以自制的SIO2壳为载体的CMS-CE催化剂活性最好,在最佳条件下,糠醛转化率和糠醇选择性都可达100%,而仲丁醇转化率为52.9%,甲乙酮选择性为100%.通过TPr和Xrd对催化剂进行了表征,发现Cu0是催化剂的活性中心.A series of supported copper based catalysts for the coupling process of 2-butanol dehydrogenation and furfural hydrogenation were prepared by different methods.The effect of promoters and silicon sources on the catalysts' activities were emphatically investigated.The results showed that the CMS-Ce catalyst supported on the self-prepared hollow silica had the best activity.The conversion of furfural and the selectivity to furfuryl alcohol both reached 100%,while the conversion of 2-butanol reached 52.9% and the selectivity to methyl ethyl ketone was 100% under the optimized reaction conditions.Cu0 was believed to be the active site of the catalysts based on XRD and TPR characterization.河北省自然科学基金资助项目(B2007000156);河北大学自然科学基金资助项目(2006Y03

Prediction of Energy Resolution in the JUNO Experiment

International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors