搜索结果: 1-15 共查到“理学 N2O5”相关记录22条 . 查询时间(0.009 秒)
中国科学院生态中心等发现大气N2O5非均相生成新机制（图）
生态中心 大气N2O5 气相氧化
2023/4/23
硝酸盐是大气PM2.5的主要组成。大气硝酸盐的两个主要生成途径分别为NO2的气相氧化（与OH自由基反应）以及N2O5的水解。传统观点认为，大气N2O5的唯一来源是NO2和大气NO3自由基的反应，而NO3自由基主要来自于NO2与O3反应。
硝酸盐是大气PM2.5的主要组成。大气硝酸盐的两个主要生成途径分别为NO2的气相氧化（与OH自由基反应）以及N2O5的水解。传统观点认为大气N2O5的唯一来源是NO2和大气NO3自由基的反应，而NO3自由基主要来自于NO2与O3反应。在国家自然科学基金大气霾化学基础科学中心等项目（22122610, 22188102, 22006158）资助下，中国科学院生态环境研究中心贺泓院士团队与宾夕法尼亚大...
五氧化二氮(N2O5）是对流层大气化学过程的关键物种之一，其在颗粒物表面的非均相水解反应是硝酸盐生成的重要途径。N2O5主要来自NO2和NO3自由基的化学反应，由于日间NO3的光解反应较快且NO3能够被NO快速消耗，使得日间N2O5的生成受阻，加之N2O5具有极强的光不稳定特性，致使目前的研究普遍认为N2O5化学反应在日间不重要，N2O5非均相水解反应也仅仅在夜间对硝酸盐的生成产生重要贡献。
近期，安光所谢品华研究员课题组在大气NO3和N2O5同步高灵敏探测研究方面取得新进展，相关研究工作发表在Optics Express（光学二区）上。
N2O5/HNO3硝解TAIW合成CL-20
有机化学 N2O5 六硝基六氮杂异伍茲烷 绿色合成 2,6,8,12-四乙酰基-2,4,6,8,10,12-六氮杂四环-[5,5,0,03,11,05,9]十二烷 炸药
2015/7/28
以2,6,8,12-四乙酰基-2,4,6,8,10,12-六氮杂四环-［5,5,0,03,11,05,9］十二烷(TAIW)为原料，采用N2O5HNO3为硝化剂硝解TAIW制备六硝基六氮杂异伍茲烷(CL-20)。通过系统研究N2O5/HNO3硝解TAIW的加料方式、温度、料比、反应时间、稀释用水量等因素对反应收率和纯度的影响，找出了最佳反应条件：反应温度60～80℃，反应时间7 h, m(TAIW...
Night-time chemistry above London: measurements of NO3 and N2O5 from the BT Tower
Night-time chemistry London NO3 N2O5 the BT Tower
2010/10/21
Broadband cavity enhanced absorption spectroscopy (BBCEAS) has been used to measure the sum of concentrations of NO3 and N2O5 from the BT (telecommunications) Tower 160 m above street level in central...
N2O5硝解三丙酰基三氮杂环己烷制备RDX
有机化学 N2O5 三丙酰基三氮杂环己烷 RDX 硝解 炸药
2014/3/4
以三丙酰基三氮杂环己烷为原料，N2O5/HNO3为硝解剂制备了RDX。分别考察了硝解剂浓度、反应物配比、反应温度和反应时间对RDX产率的影响。结果表明，当N2O5与HNO3的摩尔比为1∶10，N2O5与三丙酰基三氮杂环己烷的摩尔比为6∶1，反应温度为45℃，反应1h，RDX的最高产率可达92.7%，纯度为98.5%。
Sensitivity of a global model to the uptake of N2O5 by tropospheric aerosol
a global model N2O5 tropospheric aerosol
2010/8/16
The uptake of N2O5 on aerosol impacts atmospheric concentrations of NOx and so O3, OH, and hence CH4. Laboratory studies show significant variation in the rate of uptake, with a general decline in the...
Uptake of NO3 and N2O5 to Saharan dust, ambient urban aerosol and soot: a relative rate study
NO3 and N2O5 Saharan dust ambient urban aerosol and soot a relative rate study
2010/8/12
The uptake of NO3 and N2O5 to Saharan dust, ambient aerosols and soot was investigated using a novel and simple relative rate method with simultaneous detection of both NO3 and N2O5. The use of cavity...
对五氧化二氮(N2O5)的制备、放大生产以及N2O5硝化体系的应用进行了综述。其中N2O5/硝酸体系的硝化能力强，但硝化选择性差，故常用于钝化底物的硝化。N2O5/有机溶剂体系硝化温和，选择性好，主要用于酸敏性和水敏性及含多官能团物质的选择性硝化。N2O5/固体载体体系不仅具有N2O5/有机溶剂体系的硝化特点，而且硝化反应在载体表面进行，避免了大量使用有毒的有机溶剂，操作简单，产物易分离。附参考文...
Toward a general parameterization of N2O5 reactivity on aqueous particles: the competing effects of particle liquid water, nitrate and chloride
N2O5 reactivity aqueous particles particle liquid water nitrate chloride
2009/11/19
The heterogeneous reaction of N2O5 on mixed organic-inorganic aerosol particles was investigated using an entrained aerosol flow tube coupled to a custom-built chemical ionization mass spectrometer. L...
An experimental technique for the direct measurement of N2O5 reactivity on ambient particles
experimental technique direct measurement N2O5 reactivity ambient particles
2010/2/8
An experimental approach for the direct measurement of trace gas reactivity on ambient aerosol particles has been developed. The method utilizes a newly designed entrained aerosol flow reactor coupled...
Chlorine activation by N2O5:simultaneous,in situ detection of ClNO2 and N2O5 by chemical ionization mass spectrometry
Chlorine activation N2O5 simultaneous ClNO2 N2O5 chemical ionization mass spectrometry
2010/2/8
We report a new method for the simultaneous in situ detection of nitryl chloride (ClNO2) and dinitrogen pentoxide (N2O5) using chemical ionization mass spectrometry (CIMS). The technique relies on the...
Reactive uptake coefficients for heterogeneous reaction of N2O5 with submicron aerosols of NaCl and natural sea salt
Reactive uptake coefficients N2O5 submicron aerosols NaCl natural sea salt
2009/3/4
The kinetics of uptake of gaseous N2O5 on submicron aerosols containing NaCl and natural sea salt have been investigated in a flow reactor as a function of relative humidity (RH) in the range 30-80% a...
Kinetics and mechanism of the uptake of N2O5 on mineral dust at 298 K
Kinetics mechanism N2O5 mineral dust
2009/2/19
The heterogeneous reaction of N2O5 with mineral (Saharan) dust has been studied at T=298 K using a combination of Knudsen and DRIFTS cells for kinetic and product investigations, respectively. The ini...