改进型XC502低压甲醇合成催化剂的制备

采用离子掺杂价态补偿原理及正交试验方法，在三组份Ｃｕ－Ｚｎ－Ａｌ低压甲醇合成催化剂中添加适量的ＩＶＢ族和ＶＢ族金属氧化物助剂，研制五组份多促进的Ｃｕ－Ｚｎ－Ａｌ－Ｍ１－Ｍ２的甲醇合成催化剂ＸＣ５０２．实验结果表明，在５．０ＭＰａ、２４０℃的条件下，ＸＣ５０２催化剂耐热前的活性比Ｃｕ－Ｚｎ－Ａｌ催化剂高约１０％，耐热后高约２９％；ＸＲＤ和ＤＴＡ表征显示，ＸＣ５０２催化剂前驱态含绿铜锌矿［（Ｃｕ，Ｚｎ）（ＯＨ）２（ＣＯ３）］和孔雀石［（Ｃｕ２（ＯＨ）２ＣＯ３］构型的组份较多，分散度较好．这与ＸＣ５０２型催化剂具有低温高活性和较好的热稳定性密切相关

改进型XC502低压甲醇合成催化剂的研究 Ⅱ.催化剂的活性位

采用ＸＰＳ－Ａｕｇｅｒ、ＸＲＤ和ＦＴＩＲ等方法，对５组分Ｃｕ－Ｚｎ－Ａｌ－Ｍ１－Ｍ２改进ＸＣ５０２铜基低压甲醇合成催化剂进行了表征。ＸＰＳ－Ａｕｇｅｒ结果表明，ＸＣ５０２催化剂出现主峰为３３６．４ｅＶ（Ｃｕ＋），而Ｃｕ－Ｚｎ－Ａｌ催化剂主峰为３３４．９ｅＶ（Ｃｕ０）；ＸＲＤ结果表明，两种工作态催化剂比氧化态新增峰的２θ分别为３６．５°（Ｃｕ＋）和４３．３°（Ｃｕ０），ＸＣ５０２催化剂这两峰的强度比Ｉ３６．５／Ｉ４３．３是Ｃｕ－Ｚｎ－Ａｌ催化剂的２．１倍，说明工作态ＸＣ５０２催化剂单位Ｃｕ０中的Ｃｕ＋含量比Ｃｕ－Ｚｎ－Ａｌ催化剂多；ＦＴＩＲ谱显示，ＸＣ５０２和Ｃｕ－Ｚｎ－Ａｌ两种工作态催化剂新增波数分别为６２２ｃｍ－１和６２７ｃｍ－１的振动峰，此新增峰可能是Ｃｕ＋－Ｏ或Ｃｕ＋－Ｏ－Ｚｎ２＋的振动峰。改进型铜基甲醇合成催化剂的活性位可能是Ｃｕ０－Ｃｕ＋－Ｏ－Ｚｎ２＋／Ａｌ２Ｏ３－ＭＯｘ

改进型铜基甲醇合成催化剂NC208的DTA研究

对改进型铜基催化剂进行了研究，活性评价结果表明，改进型铜基甲醇合成催化剂ＮＣ２０８（Ｃｕ－Ｚｎ－Ａｌ－Ｍ１２）初始活性比工业催化剂Ｃ２０７（Ｃｕ－Ｚｎ－Ａｌ）提高约１８％；耐热试验后比Ｃ２０７提高约４６％。两种催化剂的ＤＴＡ对比试验显示，工作态ＮＣ２０８催化剂热稳定性明显优于Ｃ２０７；ＮＣ２０８催化剂前驱体含Ｃｕ（ＮＯ３）２·３Ｃｕ（ＯＨ）２、Ｚｎ５（ＯＨ）６（ＣＯ３）２和（ＣｕＺｎ）（ＯＨ）２ＣＯ３等成分比Ｃ２０７多，其分解温度小于３５０℃；ＮＣ２０８催化剂还原最高温度为２３５℃

改进型铜基甲醇合成催化剂NC208的DTA研究

对改进型铜基催化剂进行了研究，活性评价结果表明，改进型铜基甲醇合成催化剂ＮＣ２０８（Ｃｕ－Ｚｎ－Ａｌ－Ｍ１２）初始活性比工业催化剂Ｃ２０７（Ｃｕ－Ｚｎ－Ａｌ）提高约１８％；耐热试验后比Ｃ２０７提高约４６％。两种催化剂的ＤＴＡ对比试验显示，工作态ＮＣ２０８催化剂热稳定性明显优于Ｃ２０７；ＮＣ２０８催化剂前驱体含Ｃｕ（ＮＯ３）２·３Ｃｕ（ＯＨ）２、Ｚｎ５（ＯＨ）６（ＣＯ３）２和（ＣｕＺｎ）（ＯＨ）２ＣＯ３等成分比Ｃ２０７多，其分解温度小于３５０℃；ＮＣ２０８催化剂还原最高温度为２３５℃

Preparation of K_2MoS_4/SiO_2 Catalyst For Methanethiol Synthesis From High-H_2S Containing Syngas

高硫合成气制甲硫醇k_2MOS_4/SIO_2催化剂杨意泉，车长针，袁友珠，方钦和，林国栋，张鸿斌（厦门大学化学系，厦门大学物理化学研究所，厦门361005）关键词负载型k_2MOS_4/SIO_2催化剂，甲硫醇，H_2S1.前言甲硫醇是合成蛋氨酸的重要原...The eFFect of H_2S content in Feed-syngas, reaction temperature and pressure on the catalytic activity and reaction selectivity by one-step method over the catalyst K_2MoS_4/SiO_2 For methanethiol synthesis From high-H_2S containing syngas has been investigated.The results show that an optimum reaction condition may be 563 K, 2.0 3.0 MPa and 5 6% H_2S content in the Feed synga

高硫合成气制甲硫醇K_2MoS_4／SiO_2催化剂

高硫合成气制甲硫醇Ｋ_２ＭｏＳ_４／ＳｉＯ_２催化剂杨意泉，车长针，袁友珠，方钦和，林国栋，张鸿斌（厦门大学化学系，厦门大学物理化学研究所，厦门３６１００５）关键词负载型Ｋ_２ＭｏＳ_４／ＳｉＯ_２催化剂，甲硫醇，Ｈ_２Ｓ１．前言甲硫醇是合成蛋氨酸的重要原..

Study of a modiFied low pressure copperbased catalyst XC502 For methanol synthesis

采用XPS-AugEr、Xrd和fTIr等方法，对5组分Cu-zn-Al-M1-M2改进XC502铜基低压甲醇合成催化剂进行了表征。XPS-AugEr结果表明，XC502催化剂出现主峰为336.4EV（Cu＋），而Cu-zn-Al催化剂主峰为334.9EV（Cu0）；Xrd结果表明，两种工作态催化剂比氧化态新增峰的2θ分别为36.5°（Cu＋）和43.3°（Cu0），XC502催化剂这两峰的强度比I36.5/I43.3是Cu-zn-Al催化剂的2.1倍，说明工作态XC502催化剂单位Cu0中的Cu＋含量比Cu-zn-Al催化剂多；fTIr谱显示，XC502和Cu-zn-Al两种工作态催化剂新增波数分别为622CM-1和627CM-1的振动峰，此新增峰可能是Cu＋-O或Cu＋-O-zn2＋的振动峰。改进型铜基甲醇合成催化剂的活性位可能是Cu0-Cu＋-O-zn2＋/Al2O3-MOX。pectroscopic　characterization　of　the　active　site　of　a　modiFied　low　pressure　copperbased　catalyst　XC502,　prepared　by　adding　a　small　amount　of　metal　oxides　of　the　VI　B　and　VB　groups　to　a　CuZnAl catalyst　For　methanol　synthesis,　is　carried　out　by　XPSAuger,　XRD　and　FTIR.The　main　peaks　are　detected　by　XPSAuger　to　be　336.4eV(Cu+)　and　334.9eV(Cu0)　on　the　surFaces　of　XC502　and　the　CuZnAl　catalyst,　respectively.The　XRD　result　shows　that　two　new　peaks　appear　at　2θ=36.5°(Cu+)　and　43.3°(Cu0)　For　those　Functioning　catalysts,　but　I36.5/I43.3　of　XC502　is　twice　as　large　as　that　of　the　CuZnAl　catalyst,　showing　that　the　surFace　of　the　Functioning　XC502　catalyst　has　higher　Cu+/Cu0　ratio　and　valence　stability　than　those　of　the　CuZnAl　catalyst.By　applying　FTIR　spectroscopy,　bands　at　622　cm-1　and　627cm-1　are　observed　on　the　Functioning　XC502　and　CuZnAl　catalysts,　respectively,　and　the　band　may　be　assigned　to　Cu+OZn2+　bond　vibration.In　light　of　the　above　results,　it　is　suggested　that　the　active　site　on　the　Functioning　XC502　copperbased　catalyst　For　methanol　synthesis　at　low　pressure　is　probably　　Cu0Cu+OZn2+/Al2O3MOx

大连极紫外相干光源

先进光源的发展在前沿科学研究中发挥的作用越来越重要。近十年来,飞速发展的自由电子激光技术为科学家们提供了探索未知世界、发现新科学规律和实现技术变革的重要工具。建成的大连极紫外(EUV)相干光源的运行波段为50~150nm,单脉冲能量大于100μJ,且可提供10-12 s和10-13 s量级的超快激光脉冲,是我国第一台自由电子激光用户装置,并且是国际上唯一运行在极紫外波段的自由电子激光用户装置,在世界范围内为用户提供具有高峰值亮度和超短脉冲的极紫外激光。大连EUV相干光源是由国家自然科学基金委资助、由中国科学院大连化学物理研究所和上海应用物理研究所共同承担的重大科学仪器研制项目,目标是打造一个以先进极紫外光源为核心、主要用于能源基础科学研究的光子科学平台

Amplitude analysis of the decays D0 → π+π−π+π− and D0 → π+π−π0π0*

Using e+e− annihilation data corresponding to an integrated luminosity of 2.93 fb−1 taken at the center-of-mass energy √s = 3.773 GeV with the BESIII detector, a joint amplitude analysis is performed on the decays D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η). The fit fractions of individual components are obtained, and large interferences among the dominant components of the decays D0 → a1(1260)π, D0 → π(1300)π, D0 → ρ(770)ρ(770), and D0 → 2(ππ)S are observed in both channels. With the obtained amplitude model, the CP-even fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are determined to be (75.2 ± 1.1stat. ± 1.5syst.) % and (68.9 ± 1.5stat. ± 2.4syst.)%, respectively. The branching fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are measured to be (0.688 ± 0.010stat. ± 0.010syst.)% and (0.951 ± 0.025stat. ± 0.021syst.)%, respectively. The amplitude analysis provides an important model for the binning strategy in measuring the strong phase parameters of D0 → 4π when used to determine the CKM angle γ(φ3) via the B− → DK− decay

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements