一种表面覆盖分子筛膜的钯基膜及其制备方法

一种表面覆盖分子筛膜的钯基膜及其制备方法。通过在钯基膜表面制备硅铝基微孔分子筛膜，利用分子筛膜的微孔道小分子透过特性，优先通过小分子氢气，而拦截其它有毒大分子或者粉尘，从而避免钯膜中毒磨损，保护钯基膜。本发明方法为钯基氢分离膜提供了一种抗中毒和防护措施，将获得广泛应用

一种合成气直接制二甲醚的催化剂制备方法

一种合成气直接制二甲醚的催化剂制备方法，采用含有Cu，Zn和Al或Cu，Zn和Zr或Cu，Zn，Al和Zr的硝酸盐作为催化剂制备的原料，各组份的原子比为Cu/Zn/(Al+Zr)＝1/0.4-0.7/0.03-0.3，脱水组分为固体酸，合成组分和脱水组分比例为1∶1-5∶1(重量比)。本发明制作过程简单，重复性好，所制备的催化剂粒度小，比表面高，各组份间接触紧密因而协同作用强，从而使催化剂对二甲醚合成具有较高的活性。带填

一种天然气低能耗制取合成气的方法

一种用于将天然气（甲烷）、水蒸气和空气或富氧空气转化为合成气的方法，其特征是将天然气（甲烷）、水蒸气和空气或富氧空气按一定比例混合后通入装有催化剂的反应器，将原料气直接低能耗地转化为合成气；反应条件为：温度６００～９８０℃，压力０．２～３．０ＭＰa，天然气空速１０００～１５００００h－1，天然气／水蒸气／（体积比，下同）＝１／０．３～１／３，天然气／空气＝１／１～１／３（空气为原料）或天然气／氧气＝１／０．２～１／０．７（富氧空气为原料，富氧空气中Ｏ２／Ｎ２＝１／３．５～１／０．１）。本发明能耗与生产成本低、装置投资省、产物组成按不同需要可以调节。带填

甲烷空气催化部分氧化制合成气与含氮合成气制二甲醚的研究

采用常规浸渍法制备了经镧和镁改性的镍基催化剂，以铜锌铝甲醇合成催化剂和HZSM－5分子筛通过机械混合制造了二甲醚合成催化剂，采用固定床流动反应色谱装置研究了甲烷空气催化部分氧化制合成气的催化性能，同时开展了以含氮合成气制备二甲醚的研究，结果说明，镍基催化剂对甲烷空气部分氧化制合成气在常压下具有高的转化率，随压力升高，随压力升高，转化率明显下降，并且催伦剂严重积炭，通过向反应体系添加H2O和CO2可以提高加压条件下的CH4转化率并抑制催化剂积炭，还可获得n(H2)/n(CO)接近2的合成气，满足合成二甲醚的要求，采用含氮合成气制备二甲醚，在压力7．0MPa，空速1000h^-1条件下，催化剂连续使用200h性能基本稳定，CO转化率在93％左右，DME选择性在77％左右，DME收率在72％左右

中国黄土高原地帯におけるトロンの線量寄与

第46回大

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