搜索结果: 76-90 共查到“理学 NOx”相关记录107条 . 查询时间(0.156 秒)
Multiphase modeling of nitrate photochemistry in the quasi-liquid layer (QLL): implications for NOx release from the Arctic and coastal Antarctic snowpack
Multiphase modeling nitrate photochemistry quasi-liquid layer NOx release Arctic
2008/11/17
We utilize a multiphase model, CON-AIR (Condensed Phase to Air Transfer Model), to show that the photochemistry of nitrate (NO3−) in and on ice and snow surfaces, specifically the quasi-liquid l...
Evaluation of a new lightning-produced NOx parameterization for cloud resolving models and its associated uncertainties
lightning-produced NOx cloud resolving models
2008/11/17
A new parameterization of the lightning-produced NOx has been developed for cloud-resolving models. This parameterization is based on the unique characteristics of identifying which convective cells a...
Impact of the new HNO3-forming channel of the HO2+NO reaction on tropospheric HNO3, NOx, HOx and ozone
HNO3-forming channel HO2+NO reaction tropospheric HNO3 NOx HOx ozone
2008/11/13
We have studied the impact of the recently observed reaction NO+HO2→HNO3 on atmospheric chemistry. A pressure and temperature-dependent parameterisation of this minor channel of the NO+HO2→NO2+OH reac...
采用Dmol3程序中密度泛函理论(DFT)的广义梯度方法GGA/BLYP和DND基组研究了银离子交换的丝光沸石([Ag]-AlMOR)结构及其对NOx分子吸附性能的影响, 获得吸附复合物的平衡几何结构参数、吸附能以及红外振动频率等数据. 结果表明, NOx分子与丝光沸石间的主要作用力为NOx分子中的氮(或氧)原子上的孤对电子和Ag+间的静电作用力. 吸附能数据表明, NOx分子以η1-N模式吸附在...
Biogenic nitrogen oxide emissions from soils – impact on NOx and ozone over West Africa during AMMA (African Monsoon Multidisciplinary Experiment): modelling study
nitrogen oxide ozone West Africa AMMA
2008/11/6
Nitrogen oxide biogenic emissions from soils are driven by soil and environmental parameters. The relationship between these parameters and NO fluxes is highly non linear. A new algorithm, based on a ...
Biogenic nitrogen oxide emissions from soils: impact on NOx and ozone over west Africa during AMMA (African Monsoon Multidisciplinary Analysis): observational study
nitrogen oxide NOx ozone west Africa AMMA
2008/11/5
Chemical and meteorological parameters measured on board the Facility for Airborne Atmospheric Measurements (FAAM) BAe 146 Atmospheric Research Aircraft during the African Monsoon Multidisciplinary An...
Observations of the effects of temperature on atmospheric HNO3, ΣANs, ΣPNs, and NOx: evidence for a temperature-dependent HOx source
Observations of the effects of temperature atmospheric HNO3 ΣANs ΣPN NOx
2008/11/3
We describe observations of atmospheric reactive nitrogen compounds including NO, NO2, total peroxy nitrates, total alkyl nitrates, and HNO3 and their correlation with temperature. The measurements we...
Lightning activity in Brazilian thunderstorms during TROCCINOX: implications for NOx production
Brazilian thunderstorms TROCCINOX implications NOx
2008/10/30
During the TROCCINOX field experiment in January and February 2005, the contribution of lightning-induced nitrogen oxides (LNOx) from tropical and subtropical thunderstorms in Southern Brazil was inve...
On the vertical distribution of boundary layer halogens over coastal Antarctica: implications for O3, HOx, NOx and the Hg lifetime
vertical distribution boundary layer halogens coastal Antarctica Hg
2008/10/30
A one-dimensional chemical transport model has been developed to investigate the vertical gradients of bromine and iodine compounds in the Antarctic coastal boundary layer (BL). The model has been ap...
应用查表法模拟区域对流层O3、Nox分布和演化的研究
光化学反应 对流层 臭氧 氮氧化物
2008/9/28
应用STEM-II气相光化学模式探讨了影响对流层O3、NOx气相光化学转化率的各物理、化学因子。表明在我国多数地区光化学污染物特征(NMHC/NOx较高)下，光辐射强度、温度、初始O3浓度和NOx浓度是影响O3、NOx气相光化学转化率的主要因子。将以上因子分档组合，计算并建立了各种情况下O3、NOx气相光化学转化率的查算表，并将之用于模拟区域O3、NOx的演化和分布。结果表明，与光化学模式直接耦合...
提高生物法净化NOx废气性能的实验探索
NOx废气 生物法净化 提高性能
2012/11/8
采用生物膜填料塔实验装置,从添加pH缓冲剂、CO2气体、有机酸、金属离子催化剂以及好氧/厌氧、中性/酸性操作条件等方面,对提高生物法净化低浓度NOx废气(以NO为主要成分)性能进行了实验探索.结果表明,以NaHCO3作为缓冲剂、添加少量冰醋酸以及在好氧及中性条件下操作,能够显著提高生物膜填料塔对废气中NO的净化性能.对于在好氧及酸性条件下,添加少量金属离子催化剂同样可以明显提高生物膜填料塔对废气中...
原位漫反射红外光谱法研究Ag/Al2O3催化C2H5OH 和 CH3OCH3选择性还原NOx的不同反应机理
NOx选择性催化还原 原位漫反射红外光谱 烯醇式物种（RCH=CH-O-） 甲酸盐（HCOO-） 异氰酸酯（-NCO）
2007/12/27
尽管C2H5OH和CH3OCH3是同分异构体，在以Ag/Al2O3为催化剂选择性催化还原NOx时，C2H5OH是一种比CH3OCH3更具活性的还原剂. 原位漫反射红外光谱研究表明，C2H5OH和CH3OCH3在还原NOx反应过程中分别遵循不同的反应机理：在Ag/Al2O3催化C2H5OH选择性还原NOx的反应过程中，烯醇式物种（RCH=CH-O-）物种和NO3- 物种是主要的反应中间体，二者之间相...
选择性催化C3H6还原NOx反应的氢气影响―――Ag/Al2O3 和Cu/Al2O3 催化剂上的对比研究
H2 Ag/Al2O3 Cu/Al2O3 NOx选择性催化还原 原位漫反射红外光谱 烯醇式物种（RCH=CH-O-） 异氰酸酯（－NCO）
2007/12/27
添加H2对于Ag/Al2O3和Cu/Al2O3催化剂上选择性催化C3H6还原NOx的反应具有不同的影响. 利用原位红外光谱分析了H2不同影响的原因. Ag/Al2O3催化剂上，H2的存在促进了烯醇式物种（RCH=CH-O-）和乙酸盐等C3H6部分氧化产物的形成，烯醇式物种和硝酸盐成为主要的反应中间体，二者之间相互反应性能很强，形成了高浓度的反应关键中间体异氰酸酯（－NCO）表面吸附物种，因此NOx...
本文首次采用低温固相法(Low-temperature Solid Reaction)制备的无载体MnOX(LS)催化剂用于NOX的低温NH3-SCR。该催化剂为晶化度极低的混合锰氧化物，部分为粒径40~60 nm的棒状晶体颗粒，其余是更细小的无定形颗粒；催化剂BET比表面积150.8 m2g-1，吸附能力较强，NOX吸附量可达138.27 µmol/g-1。在模拟尾气试验条件下，Mn...