Study of Active Sites Over Pt Gd/KL and Pt/GdKL Catalysts

通过把gd引入PT/kl分子筛单功能重整催化剂，研究PTgd/kl和PT/gdkl分子筛的重整反应性能和活性中心以及催化剂的表面酸碱性。结果表明，gd的引入方式和引进量对催化重整反应有明显影响。共浸法制备的催化剂PTgd/kl，其芳构活性比离子交换法制备的催化剂PT/gdkl高，gd含量为01%的PT01gd/kl芳构活性最好。弱酸性和弱碱性物质以及硫化物对PTgd/kl和PTgdkl催化重整反应的影响gd小于不含gd的PT/kl。gd对催化重整反应有两方面影响：其一是与金属PT相互作用增加活性中心、加强金属功能；其二是增加催化剂的酸性和裂解产物，降低芳构选择性。Gadolinium was added to Pt/KL zeolite monofunctional catalyst in order to study aromatization activity, active sites and some other surFace properties of Pt Gd/KL and Pt/GdKL.The results show that the way and the content of Gd adding into the Pt/KL catalyst have remarkable inFluence on the catalytic perFormance.The aromatization activity of Pt Gd/KL is higher than that of Pt/GdKL and the catalyst Pt 01Gd/KL with 0 1% Gd has the highest aromatization activity.Besides, carbon sulFide and weakly acidic substance phenol as well as weakly basic substance triethylamine can inFluence the catalytic perFormance, however, the eFFect on the reForming reaction over the catalyst Pt Gd/KL or Pt/GdKL, is smaller than that over the catalyst Pt/KL.Gd may inFluence catalytic perFormance by two ways, namely, (1) the Gd in Pt Gd/KL increases mainly the active sites of catalyst and enhances the metal Function of catalyst; (2) the Gd in Pt/GdKL increases the acidity in the catalyst and decreases aromatization activity and selectivity.江西省自然科学基金;南昌大学青年基

Catalytic PerFormance For Oxidative Coupling of Methane Over Eu 2O 3 Catalysts Promoted by Alkaline Earth Fluorides

考察了碱土金属氟化物促进的Eu2O3在甲烷氧化偶联反应中的催化性能。发现在Eu2O3中添加碱土金属氟化物后，碳二烃（C2）的选择性和收率都有明显提高。当Eu2O3摩尔含量相同时，催化性能按CAf2Eu2O3≈bAf2Eu2O3＜Srf2Eu2O3顺序递增。Xrd分析结果表明，在新鲜的bAf2Eu2O3催化剂中出现了菱形EuOf新相，而在其它两类催化剂中氟氧离子交换不明显，这种差异与碱土金属氟化物中阳离子半径的差别有关。吡啶（Py）和CO2TPd测试表明，Eu2O3中添加Srf2后，表面酸性减弱，碱强度稍有增加，有利于C2选择性的提高。The catalytic perFormance of oxidative coupling of methane(OCM) over Eu 2O 3 catalysts promoted by alkaline earth Fluorides was studied.The results showed that C 2 hydrocarbon selectivity and yield over the Fluoride promoted Eu 2O 3 catalysts were apparently higher than those of pure Eu 2O 3.The OCM perFormance increased according to the sequence of CaF 2 Eu 2O 3≈BaF 2 Eu 2O 3<SrF 2 Eu 2O 3 under the same conditions.X ray diFFraction experiment indicated that rhombohedral Euof phase Formed in the Fresh BaF 2 Eu 2O 3 catalyst, while the exchange of F - and O 2 did not apparently happen in the Fresh CaF 2 Eu 2O 3 and SrF 2 Eu 2O 3 catalysts.Pyridine TPD measurements showed that, aFter adding SrF 2 to Eu 2O 3, the catalyst surFace acidity decreased, whereas the surFace basic strength increased slightly, resulting in an improvement in C 2 selectivity and yield.国家自然科学基

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies