1,4-丁炔二醇温和条件下PdNi基加氢催化剂的研究

鉴于丁炔二醇加氢制丁二醇的生产工艺一般涉及高压/高温,以α-Al2O3或碳纳米管（CNTs）为载体,研发了近室温近常压下1,4-丁炔二醇的Pd（Ni）基催化剂的加氢性能及其结构特征。结果发现,双金属PdNi基催化剂可以实现丁炔二醇的完全转化。对于产物丁二醇的选择性,还原法制备的PdNi/CNTs仅达60.6%,而浸渍法制备PdNi/α-Al2O3和PdNi/CNTs则可达89.1%和98.9%。X射线衍射（XRD）、氢气程序升温还原（H2-TPR）及透射电镜（TEM）等表征结果表明,具有合适相互作用、合金形式（部分）以及高度分散的Pd-Ni物种对丁炔二醇加氢具有重要作用,有利于反应中间产物丁烯二醇进一步加氢至丁二醇。而CNTs具有较优的储氢能力,以CNTs为载体有利于提高PdNi基催化剂表面的氢浓度,进而促进丁烯二醇加氢。中央高校基本科研业务费专项(20720170029

1,4-丁炔二醇温和条件下Pd-Ni基加氢催化剂的研究

鉴于1,4-丁炔二醇加氢制1,4-丁二醇的生产工艺一般涉及高压高温,分别以α-Al2O3和碳纳米管(CNTs)为载体,研究了近室温(30℃)近常压(0.2MPa)下1,4-丁炔二醇的Pd(Ni)基催化剂的加氢性能及其结构特征.结果发现,Pd-Ni双金属催化剂可以实现1,4-丁炔二醇的完全转化.对于产物1,4-丁二醇的选择性,还原法制备的1%Pd-1%Ni/CNTs仅达60.6%,而分步浸渍法制备的1%Pd-1%Ni/α-Al2O3和1%Pd-1%Ni/CNTs则分别达到89.1%和98.9%.X射线衍射(XRD)、氢气程序升温还原(H2-TPR)及透射电镜(TEM)等表征结果表明:具有合适相互作用、合金形式(部分)以及高度分散的Pd-Ni物种对1,4-丁炔二醇加氢具有重要作用,有利于反应中间产物1,4-丁烯二醇进一步加氢至1,4-丁二醇;且CNTs具有较优的储氢能力,以CNTs为载体有利于提高Pd-Ni基催化剂表面的氢浓度,进而促进1,4-丁烯二醇加氢.中央高校基本科研业务费专项(20720170029

生物微胶囊规模化制备系统的研制

生物微胶囊规模化制备系统的研制待填

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