Tailoring MXene Thickness and Functionalization for Enhanced Room‑Temperature Trace NO_(2) Sensing

In this study,precise control over the thickness and termination of Ti3C2TX MXene flakes is achieved to enhance their electrical properties,environmental stability,and gas-sensing performance.Utilizing a hybrid method involving high-pressure processing,stirring,and immiscible solutions,sub-100 nm MXene flake thickness is achieved within the MXene film on the Si-wafer.Functionalization control is achieved by defunctionalizing MXene at 650℃ under vacuum and H2 gas in a CVD furnace,followed by refunctionalization with iodine and bromine vaporization from a bubbler attached to the CVD.Notably,the introduction of iodine,which has a larger atomic size,lower electronegativity,reduce shielding effect,and lower hydrophilicity(contact angle:99°),profoundly affecting MXene.It improves the surface area(36.2 cm^(2) g^(-1)),oxidation stability in aqueous/ambient environments(21 days/80 days),and film conductivity(749 S m^(-1)).Additionally,it significantly enhances the gas-sensing performance,including the sensitivity(0.1119Ωppm^(-1)),response(0.2% and 23%to 50 ppb and 200 ppm NO_(2)),and response/recovery times(90/100 s).The reduced shielding effect of the–I-terminals and the metallic characteristics of MXene enhance the selectivity of I-MXene toward NO2.This approach paves the way for the development of stable and high-performance gas-sensing two-dimensional materials with promising prospects for future studies.

Analysis of the effect of the 2021 Semeru eruption on water vapor content and atmospheric particles using GNSS and remote sensing

Mount Semeru,an active volcano in East Java,Indonesia,erupted on December 4,2021,following extreme rainfall that caused an avalanche of hot pyroclastic flows and lava.The tropospheric conditions and dominant particle components in the atmosphere can be monitored using Global Navigation Satellite System(GNSS)technology and remote sensing satellites.GNSS signal propagation delay in Precise Point Positioning(PPP)processing can be used to determine Zenith Tropospheric Delay(ZTD)and Precipitable Water Vapor(PWV)variables so that atmospheric conditions can be generated.In addition,by using remote sensing satellite data,it is possible to obtain rainfall data with high temporal resolution as well as the dominant particle and gas content values during eruptions.During the eruption period,the high value of PWV was dominated by the high intensity of precipitation during the rainy season.High rainfall before the eruption caused activity inside the mountain to increase,which occurred in avalanche type eruption.Apart from that,the atmosphere around Semeru was also dominated by SO_(2)content,which spreaded for tens of kilometers.SO_(2)content began to be detected significantly by remote sensing sensors on December 7,2021.In this study,deformation and atmospheric monitoring were also carried out using low-cost GNSS at the Semeru Monitoring Station on September 9-15,2022.The results of the ZTD and ZWD values show the dominance of the wet component,which is directly proportional to rainfall activity in this period.

The KEu(WO_(4))_(2)Red Phosphor Co-doped with Li^(+)and SO_(4)^(2-)for Synergistic Enhancement of High Efficiency and Thermal Stability

A series of tungstate red phosphors K_(1-x)Li_(x)Eu(WO_(4))_(2-y)(SO_(4))_(y)were successfully prepared by sol-gel method,and the effects of the introduction of Li~+and SO_(4)^(2-)on the fluorescence intensity and thermal quenching properties of the prepared K_(1-x)Li_(x)Eu(WO_(4))_(2-y)(SO_(4))_(y)phosphors were investigated.The X-ray diffraction data show that the prepared(Li^(+)and SO_(4)^(2-))-doped KEu(WO_(4))_(2)phosphors have a monoclinic tetragonal structure.In addition,the emission intensities of all the observed emission peaks change significantly with the increase of Li~+doping concentration,especially the intensity of the emission peaks at 615 nm fluctuated significantly and reached the maximum at x=0.3 and y=0.2.The K_(1-x)Li_(x)Eu(WO_(4))_(2-y)(SO_(4))_(y)phosphors are found to have the highest fluorescence intensity at x=0.3 and y=0.2.Moreover,the K_(0.7)Li_(0.3)Eu(WO_(4))_(1.8)(SO_(4))_(0.2)phosphor has better thermal quenching properties and luminescence efficiency,and the experimental results indicates that the fluorescence intensity and thermal burst performance of KEu(WO_(4))_(2)red phosphor could be effectively improved by using low-cost bionic doping of Li^(+)and SO_(4)^(2-).

Exploring the impact of economic growth and energy consumption on SO_(2) emissions in China based on the Environmental Kuznets Curve hypothesis

This study aims to analysis the influence of economic growth(EG)and energy consumption(EC)on sulfur dioxide emissions(SE)in China.Accordingly,this study explores the link between EG,EC,and SE for 30 provinces in China over the span of 2000-2019.This study also analyzes cross-sectional dependence tests,panel unit root tests,Westerlund panel cointegration tests,Dumitrescu-Hurlin(D-H)causality tests.According to the test results,there is an inverted U-shaped association between EG and SE,and the assumption of the Environmental Kuznets Curve(EKC)is verified.The signs of EG and EC in the fixed effect(FE)and random effect(RE)methods are in line with those in the dynamic ordinary least squares(DOLS),fully modified ordinary least squares(FMOLS)and autoregressive distributed lag(ARDL)estimators.Moreover,the results verified that EC can obviously positive impact the SE.To reduce SE in China,government and policymakers can improve air quality by developing cleaner energy sources and improving energy efficiency.This requires the comprehensive use of policies,regulations,economic incentives,and public participation to promote sustainable development.

Highly defective HKUST-1 with excellent stability and SO_(2) uptake: The hydrophobic armor effect of functionalized ionic liquids

Water stability is one of the most important factors restricting the practical application of metal organic frameworks (MOFs). In this work, wefabricate a highly defective HKUST-1 framework with a mixed valence of CuI/CuIIby mechanical ball milling method. This defective HKUST-1is embellished by functionalized ionic liquids as hydrophobic armor, making the hybrid HIL1@HKUST-1 exhibits outstanding water stability,remarkable SO_(2) adsorption (up to 5.71 mmol g^(-1)), and record-breaking selectivity (1070 for SO_(2)/CO_(2) and 31,515 for SO_(2)/N_(2)) at 25 ℃ and0.1 bar, even in wet conditions.

A Flexible Smart Healthcare Platform Conjugated with Artificial Epidermis Assembled by Three‑Dimensionally Conductive MOF Network for Gas and Pressure Sensing

The rising flexible and intelligent electronics greatly facilitate the noninvasive and timely tracking of physiological information in telemedicine healthcare.Meticulously building bionic-sensitive moieties is vital for designing efficient electronic skin with advanced cognitive functionalities to pluralistically capture external stimuli.However,realistic mimesis,both in the skin’s three-dimensional interlocked hierarchical structures and synchronous encoding multistimuli information capacities,remains a challenging yet vital need for simplifying the design of flexible logic circuits.Herein,we construct an artificial epidermal device by in situ growing Cu_(3)(HHTP)_(2) particles onto the hollow spherical Ti_(3)C_(2)T_(x) surface,aiming to concurrently emulate the spinous and granular layers of the skin’s epidermis.The bionic Ti_(3)C_(2)T_(x)@Cu_(3)(HHTP)_(2) exhibits independent NO_(2) and pressure response,as well as novel functionalities such as acoustic signature perception and Morse code-encrypted message communication.Ultimately,a wearable alarming system with a mobile application terminal is self-developed by integrating the bimodular senor into flexible printed circuits.This system can assess risk factors related with asthmatic,such as stimulation of external NO_(2) gas,abnormal expiratory behavior and exertion degrees of fingers,achieving a recognition accuracy of 97.6%as assisted by a machine learning algorithm.Our work provides a feasible routine to develop intelligent multifunctional healthcare equipment for burgeoning transformative telemedicine diagnosis.

不同水平钙肥对设施生姜生长、产量和根茎品质的影响

以莱芜大姜为试材,通过温室盆栽试验,采用根际增施的方法研究2.5、5.0、7.5、10.0、12.5 g·株^(-1)5个不同水平Ca(NO_(3))_(2)对生姜生长、产量及品质的影响。结果表明,增施外源Ca(NO_(3))_(2)促进了生姜的生长,提高了叶片色素含量、净光合速率及根茎的产量和品质。其中Ca(NO3)2施用量≥7.5 g·株^(-1)时与不施钙(CK)相比对生姜有显著的促长增产和提质作用,在10.0 g·株^(-1)时效果最显著,采收期生姜叶片叶绿素含量和光合速率较CK显著提高21.44%和34.37%,单株产量显著增加44.22%;可溶性糖、可溶性蛋白、游离氨基酸及维生素C含量分别显著提高28.13%、36.52%、19.15%和17.49%。Ca(NO_(3))_(2)施入量在12.5 g·株^(-1)时促进作用减弱。综上所述,试验范围内外源Ca(NO_(3))_(2)均促进了生姜生长和产量增加,改善了生姜根茎品质,以外源钙施用量为10.0 g·株^(-1)时,更利于提高生姜产量和品质。

伊宁市大气中SO_2、NO_2、TSP变化状况分析

根据伊宁市大气污染特点,通过对2001~2004年伊宁市大气中主要污染物SO2、NO2、TSP的变化状况进行分析,为了解和掌握伊宁市大气质量状况提供科学依据.

Effect of Al_(2)O_(3) Nanoparticles on the Compression Ignition Performances and Emitted Pollutants of a Diesel Engine

To improve the performances of diesel engines and to reduce the pollutants they emit,aluminum oxide nanopar-ticles in varying quantities(50,100,150 ppm)have been added to conventional diesel fuel.The results of such experimental tests have revealed that the addition of nano-Al_(2)O_(3) particles to the diesel fuel reduces its consump-tion by 0.488%,1.02%,and 1.377%,respectively and increases the brake thermal efficiency by 1.4%,2.6%,and 3.8%,respectively.The concentrations of undesired gases decrease accordingly by 1.5%,1.7%,and 2.8%for HC and by 5.88%,11.7%,and 17.6%,respectively,for CO.For the same percentages of nanoparticles,NO_(x) increases by 2.65,4.36,and 5.37,while the TSP(Total Suspended Particulate)decreases by 22%,34.66%,and 49.7%,respectively.In the same conditions,sulfur dioxide pollutants increase by 4.57%,8.8%and 12.89%,and H_(2)S levels by 4.7%,7.81%and 8.9%,respectively.

Studies on polyoxymethylene dimethyl ethers production from dimethoxymethane and 1,3,5-trioxane over SO_(4)^(2-)/ZrO_(2)-TiO_(2)

Polyoxymethylene dimethyl ethers(OMEs)with physical properties similar to those of diesel has received significant attention as green additives for soot emission suppression.Herein,series of SO_(4)^(2-)/ZrO_(2)-TiO_(2)catalysts were developed for OMEs production from dimethoxymethane(DMM)and1,3,5-trioxane through sequential formaldehyde monomer insertion into C-O bond of DMM.Not Lewis but Bronsted acid sites were identified to be active for the decomposition of 1,3,5-trioxane into formaldehyde unit,however,both of them are effective for the chain propagation of DMM via formaldehyde unit insertion into C-O bond.Kinetic studies indicated each chain growth step exhibited the same parameters and activation barrier on corresponding Bronsted and Lewis acid sites due to the same reaction mechanism and very similar chemical structure of OMEs.Also,the catalytic stability investigation suggested the deactivation behavior was derived from the carbon deposition,and the decay factor could be exponentially correlated with the amount of coke accumulation.

酸性大气环境对钢梁腐蚀行为的研究

钢梁在酸性大气环境下的腐蚀是随时间逐渐进行的,了解其腐蚀深度及腐蚀速率是研究腐蚀后钢梁承载力和退化规律的前提。基于含SO_(2)的酸性大气环境下钢材腐蚀机理和幂函数模型,从金属电化学腐蚀理论出发,推导低碳钢在酸性大气环境下腐蚀深度的理论预测模型,并将得到的预测模型与大气腐蚀试验站测得的试验数据及幂函数模型进行对比,结果表明三者得到的腐蚀深度数据接近,且发展趋势一致。从电化学腐蚀角度给出预测低碳钢腐蚀深度的理论方法,为分析腐蚀环境下钢梁的稳定承载力奠定基础。

基于改进INFO-Bi-LSTM模型的SO_(2)排放质量浓度预测

针对火电机组SO_(2)排放质量浓度的影响因素众多,难以准确预测的问题,提出一种改进向量加权平均(weighted mean of vectors,INFO)算法与双向长短期记忆(bi-directional long short term memory,Bi-LSTM)神经网络相结合的预测模型(改进INFO-Bi-LSTM模型)。采用Circle混沌映射和反向学习产生高质量初始化种群,引入自适应t分布提升INFO算法跳出局部最优解和全局搜索的能力。选取改进INFO-Bi-LSTM模型和多种预测模型对炉内外联合脱硫过程中4种典型工况下的SO_(2)排放质量浓度进行预测,将预测结果进行验证对比。结果表明:改进INFO算法的寻优能力得到提升,并且改进INFO-Bi-LSTM模型精度更高,更加适用于SO_(2)排放质量浓度的预测,可为变工况下的脱硫控制提供控制理论支撑。

利用掺杂提高石墨烯吸附二氧化氮的敏感性及光学性质的理论计算

为了研究NO_(2)在未掺杂石墨烯和掺杂石墨烯(N掺杂、Zn掺杂、N-Zn双掺杂)上的吸附,本工作采用密度泛函理论的第一性原理平面波超软赝势对其吸附过程进行模拟.计算了石墨烯表面吸附NO_(2)分子的吸附能、Mulliken分布、差分电荷密度、态密度和光学性质.研究结果表明,与未掺杂石墨烯表面相比,掺杂石墨烯表面对吸附NO_(2)表现出了更高的敏感性,吸附能大小顺序为:N-Zn双掺杂表面>Zn掺杂表面>N掺杂表面>未掺杂表面.未掺杂石墨烯和N掺杂石墨烯表面与NO_(2)的相互作用较弱,是物理吸附.Zn掺杂和N-Zn双掺杂石墨烯表面与NO_(2)之间形成了化学键,是化学吸附.在可见光范围内,3种掺杂方式中N-Zn双掺杂表面对于提高石墨烯光学性能效果最佳,其吸收系数和反射系数的峰值较未掺杂石墨烯表明分别提高了约1.12倍和3.42倍.N-Zn双掺杂石墨烯不但能增强表面与NO_(2)的相互作用,同时也能提高材料的光学性能,这为基于石墨烯基底的NO_(2)气体检测传感提供了理论支撑和实验指导.

钙肥不同水平对高温夏季生姜幼苗的生理特征和叶绿素荧光的影响

为探明钙对生姜幼苗生长发育的调控机制,对生姜夏季安全生产提供理论依据及技术途径,笔者以“莱芜大姜”为试材,以不添加钙为对照,用盆栽培养方法,研究Ca(NO_(3))_(2)浓度分别为2.5,5.0,7.5,10.0,12.5g·株^(-1)对夏季高温时生姜幼苗叶片生理及光合特征的影响.结果显示,随着高温时间的持续,未施Ca肥处理的生姜叶片硝酸还原酶活性、色素含量及光合作用参数逐渐降低,电解质渗透率增加;Fv/Fm,ФPSII,Fv'/Fm',qP和P持续下降,而NPQ恰好相反.添加Ca(NO_(3))_(2)可有效缓解夏季高温对生姜植株的伤害,表现为生姜植株的电解质渗透率数值下降,生姜叶片叶绿素和类胡萝卜素含量升高,抑制生姜叶片硝酸还原酶NR活性及光合效率Pn的下降幅度;PSII的正常生理功能得以维护,叶绿素荧光参数得到有效改善.生姜叶片的各测定指标随Ca(NO_(3))_(2)浓度的增大出现先升后降或先降后升的趋势,Ca(NO_(3))_(2)浓度为10.0g·株^(-1)时,各处理的指标达到最佳,超过该最适浓度值后,各测定指标均出现下降或上升.以上表明,合适浓度的Ca(NO_(3))_(2)能有效提高叶片光合性能,增强夏季生姜幼苗的耐热性.

新标09CrCuSb耐酸钢的耐50%H_(2)SO_(4)腐蚀性能

通过电化学测试和全浸腐蚀试验,研究了不同温度(25,50,60,70℃)条件下新标09CrCuSb耐酸钢在50%H_(2)SO_(4)溶液中的腐蚀行为。结果表明:随着温度从25℃升至70℃,新标09CrCuSb钢的腐蚀速率整体呈现增大趋势,在70℃时,腐蚀速率达到最高,为2.70 g/(m^(2)·h),这与随温度升高,腐蚀产物中具有保护性作用的Fe_(3)O_(4)含量减少,无保护作用的FeSO_(4)·H_(2)O含量增加以及锈层中微孔变化有关。另外,由于新标调整了09CrCuSb钢中Cu、Mo、Sn、Sb、W等元素的含量,与旧标09CrCuSb钢相比,阳极维钝电流密度J维钝降低,同等温度条件下,新标09CrCuSb钢的耐蚀性得到较大改善。

NH_(3)SO_(3)改性稀土尾矿催化剂NH_(3)-SCR脱硝活性及SO_(2)/H_(2)O耐受性能研究

采用球磨、微波焙烧方法制备了不同质量分数NH_(3)SO_(3)改性稀土尾矿NH_(3)-SCR脱硝催化剂。通过BET、SEM-EDS、XRD、NH_(3)-TPD、H_(2)-TPR分析了催化剂脱硝活性及SO_(2)/H_(2)O耐受性能。结果表明:NH_(3)SO_(3)改性使催化剂脱硝活性得到了显著提高,10%NH_(3)SO_(3)改性催化剂在300~350℃脱硝活性可达90%左右。SO_(2)/H_(2)O共同作用可将10%NH_(3)SO_(3)改性催化剂脱硝活性提高至97%,其促进作用保持了良好的稳定性,且具有可逆性。NH_(3)SO_(3)改性稀土尾矿后,催化剂比表面积、酸性位点及强度增加,表面活性物质分散度更高,弱化了尾矿矿物晶型,提高了催化剂吸附能力和氧化还原能力,从而提高催化脱硝活性,同时具备优良的SO_(2)/H_(2)O耐受性。

硫磺回收装置烟气碱法脱硫工艺存在问题及解决方案

目的对140 kt/a硫磺回收装置新增烟气碱洗单元的运行情况进行总结,分析烟气碱洗单元运行过程中出现的异常情况,并提出应对措施。方法①总结碱洗单元的运行情况,对操作参数及烟气排放情况进行分析;②将冲洗水由工业水改为除盐水,同时稳定控制碱液pH值,解决了烟气碱洗塔压降增大的问题;③优化工艺操作,对碱洗塔与循环槽连通管线进行改造,解决了碱洗塔液位波动的问题;④保证氧化空气供给,调整碱液pH值,防止急冷塔氨逃逸,解决了含盐废水超标的问题。结果解决了烟气碱洗单元运行过程中出现的问题,该工艺单元于2017年7月建成投运,稳定运行至2022年3月装置大修,连续运行时间超过1700 d。结论实现了装置的长周期稳定运行,烟气中SO_(2)排放稳定达标,远低于排放标准的要求,可为同类装置提供参考。

基于Sentinel-5P卫星反演京津冀地区近地面NO_(2)浓度研究

为充分利用卫星传感器在探索长时间、大范围区域内近地面二氧化氮(NO2)浓度时空变化规律方面的优势,进一步提高卫星近地面NO_(2)浓度预测的准确性,本研究以Sentinel-5P卫星TROPOMI传感器观测的对流层NO_(2)柱浓度为基础,提出一种融合多源地理要素的“自上而下”近地面NO_(2)浓度遥感估算方法,综合分析随机森林模型(RF)、极致梯度提升树模型(XGBoost)和轻型梯度提升树模型(LightGBM)的性能,基于3种树模型对2019−2020年京津冀地区近地面NO_(2)浓度进行反演,并采用十折交叉验证方法分别对3种模型在近地面NO_(2)浓度预测中的精度差异与稳定性进行了检验比较,利用拟合优度(R2)、均方根误差(RMSE)和平均绝对误差(MAE)对模型进行精度评价,最终选取XGBoost以实现京津冀地区卫星近地面NO_(2)浓度的高效分析预测(R2=0.85,RMSE=6.61μg/m^(3),MAE=2.09μg/m^(3)),在此基础上,从季度、年份等时间尺度对近地面NO_(2)浓度进行空间分析。结果表明:①由于2020年新型冠状病毒感染疫情反弹带来的人类生产活动和出行活动的大量减少,2019年近地面NO_(2)浓度(13.96μg/m^(3))比2020年(13.04μg/m^(3))整体偏高。②近地面NO_(2)浓度具有明显的季节性变化特征,春、夏两季由于大气扩散条件较好,近地面NO_(2)浓度相对较低,在冬季达到全年峰值。③基于SHAP值(沙普利加性解释法)方法对模型特征进行空间分析,并定量研究每个特征对模型的正负贡献程度,其中,对流层NO_(2)柱浓度对预测近地面NO_(2)浓度起到主要促进作用,大气边界层高度对预测近地面NO_(2)浓度起到抑制作用,另外太阳直射辐射、人口密度、地表温度及降水量等指标均对预测近地面NO_(2)浓度有明显影响。研究显示,XGBoost能够更加稳定和准确地预测卫星近地面NO_(2)浓度,为准确识别近地面NO_(2)浓度时空分布特征提供新的手段,可在一定程度上突破现阶段NO_(2)地面监测稀疏的空间局限以及卫星对流层NO_(2)柱浓度代表性不足的缺陷。

膏盐层在内生金属矿床成矿中的作用研究

膏盐层是富含石膏/硬石膏的蒸发沉积岩建造。膏盐层除SO_(4)^(2-)外还富含Cl^(-)、CO_(3)^(2-)、Na^(+)、K^(+)等盐类物质和H_(2)O,且在自然界广泛存在。膏盐层可以向成矿系统提供氧化剂(SO_(4)^(2-))、矿化剂(Cl^(-)、CO_(3)^(2-)、Na^(+)、K^(+)等)、还原硫(S^(2-))和H_(2)O等挥发分,使金属成矿物质迁移或沉淀,是玢岩型铁矿(IOA)、矽卡岩型铁矿、MVT型铅锌矿、岩浆型Ni-Cu-PGE硫化物矿和部分热液铀矿成矿的关键因素。但膏盐层在内生金属矿床成矿中的作用一直没有得到应有重视,制约了相关成矿理论的发展,影响了找矿效率的提升。与膏盐层有关的内生金属矿床空间分布明显受膏盐层控制,矿床中普遍发育石膏等硫酸盐矿物,硫酸盐和硫化物的δ^(34)S值及磁铁矿等铁氧化物的δ^(18)O值异常高。膏盐层的加入可大幅提高成矿岩浆系统的氧逸度,使铁氧化物在熔体固结线之上大量提前形成,是岩浆发生液态不混熔,形成矿浆型富铁矿的重要条件。膏盐层向岩浆-热液成矿系统提供氧化剂(SO_(4)^(2-)),将熔/流体中Fe^(2+)氧化成Fe^(3+),富集形成铁矿床的同时,SO_(4)^(2-)自身被还原为S^(2-),S^(2-)与Fe^(2+)结合富集形成硫化物矿床,因此膏盐层-玢岩/矽卡岩铁矿-硫铁矿三者紧密共生,互为找矿标志。在MVT铅锌多金属成矿系统,膏盐层中SO_(4)^(2-)被炭质/有机质/甲烷等还原形成H_(2)S,与沿逆冲推覆构造上升的富含Pb^(2+)、Zn^(2+)的氧化性成矿溶液混合,S^(2-)与Pb^(2+)、Zn^(2+)等结合富集形成铅锌多金属矿床。膏盐层-有机质-铅锌矿三位一体,紧密共生。

La_(1-x)Ce_(x)MnO_(3)-Ba/Al_(2)O_(3)催化剂对NO选择性生成NH_(3)的影响

为了实现碳中和目标,降低内燃机碳排放,稀薄燃烧技术成为了当前重要的研究方向.该技术不仅能提高发动机燃油热效率,还能有效降低CO_(2)排放.但是稀薄燃烧往往会伴随着大量氮氧化物的产生,为了解决该问题,采用LNT-SCR耦合的NO_(x)净化技术,此时LNT的作用是将排气中部分NO_(x)转化为NH_(3),为下游的SCR提供还原剂.基于此,制备了LNT催化剂,研究催化剂对NO选择性生成NH_(3)的影响.采用溶胶-凝胶法制备了La_(1-x)Ce_(x)MnO_(3)系列钙钛矿氧化物,并通过分步浸渍法得到了La_(1-x)Ce_(x)MnO_(3)-Ba/Al_(2)O_(3)负载型催化剂.利用XRD、H_(2)-TPR、NO-TPD等表征手段研究了钙钛矿氧化物的晶相结构,以及负载型催化剂的还原特性、NO_(x)吸附-脱附性能等物化性质,并且通过H_(2)选择性催化还原NO实验探究了催化剂掺杂Ce对NO转化成NH_(3)的影响.结果表明,Ce掺杂催化剂具有良好的NH_(3)产物选择性,并且显著提高了NO转化率.温度是NO转化和NH_(3)产物选择性生成的决定性因素,而H_(2)和NO体积比是NO转化和NH_(3)产物选择性生成的关键性因素.其中,La_(0.95)Ce_(0.05)MnO_(3)-Ba/Al_(2)O_(3)在低温下催化活性表现最佳,在350℃、H_(2)和NO体积比为5.0时NH_(3)产物选择性为65%,NO转化率为100%.此外,所制备的La_(1-x)Ce_(x)MnO_(3)都形成了钙钛矿型结构,而且Ce掺杂催化剂的大部分Ce离子可以进入到LaMnO_(3)结构中.在催化剂适量掺杂Ce后,H_(2)消耗总面积增大、还原峰的峰值温度降低,表明掺杂Ce改善了催化剂的还原特性;同时NO吸附和脱附面积增大,表明Ce掺杂改变了催化剂的NO_(x)吸附-脱附性能.