期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
Simulation Study of Diesel Spray Tilt Angle and Ammonia Energy Ratio Effect on Ammonia-Diesel Dual-Fuel Engine Performance
1
作者 Zhifeng Zhao Xuelong Miao +4 位作者 Xu Chen jinbao zheng Yage Di Zhenjie Bao Zhuo Yang 《Energy Engineering》 EI 2024年第9期2603-2620,共18页
Ammonia-diesel dual fuel(ADDF)engines for transportation applications are an important way to reduce carbon emissions.In order to achieve better combustion of ammonia in diesel engines.A small-bore single-cylinder eng... Ammonia-diesel dual fuel(ADDF)engines for transportation applications are an important way to reduce carbon emissions.In order to achieve better combustion of ammonia in diesel engines.A small-bore single-cylinder engine was converted into an ADDF engine with the help of mature computational fluid dynamics(CFD)simulation software to investigate the performance of an engine with a high ammonia energy ratio(AER),and to study the effect of spray tilt angle on ADDF engine.The results showed that the increase in AER reduced nitric oxide(NO)and nitrogen dioxide(NO2)emissions but increased nitrous oxide(N2O)and unburned ammonia emissions.AER in the range of 50%-70%achieved lower greenhouse gases(GHG)emissions than the pure diesel mode.Relative to the pure diesel mode,when the AER was 60%,the indicated thermal efficiency(ITE)was increased by 0.2%and the GHG emissions were decreased by 22.3%,but carbon monoxide(CO)and Hydrocarbon(HC)emissions were increased.Increasing the in-cylinder combustion temperature or high-temperature region range of the ADDF engine could reduce GHG emissions.At an AER of 60%,an increase in the spray tilt angle helped the ammonia combustion in the residual gap to reduce the unburned ammonia emissions.Compared to the pure diesel mode with a spray tilt angle of 75°,an AER of 60%with a spray tilt angle of 77.5°improved the ITE by 1.5%,and reduced theGHGemissions by 25.7%.Adjusting the spray tilt angle of theADDFengine also reducedCOandHCemissions.This is an effective way to improve ADDF engine performance by adjusting the spray tilt angle. 展开更多
关键词 Ammonia-diesel engine ammonia energy ratio greenhouse gases carbon-free fuel
下载PDF
Effect of sodium content on the interaction between Ni and support and catalytic performance for syngas methanation over Ni/Zr–Yb–O catalysts 被引量:3
2
作者 Songshou Ye Jiawei Guo +6 位作者 Yanbing Wang Jianrong Xie Zhiming Liu Nuowei Zhang jinbao zheng Zhikai Cao Binghui Chen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第11期2705-2711,共7页
In this paper, Ni/Zr–Yb–O catalysts with different sodium contents are prepared by a co-precipitation method, using aqueous Na2CO3 solution as a precipitant, and the effect of sodium on the catalyst structure and ca... In this paper, Ni/Zr–Yb–O catalysts with different sodium contents are prepared by a co-precipitation method, using aqueous Na2CO3 solution as a precipitant, and the effect of sodium on the catalyst structure and catalytic performance for syngas methanation is extensively investigated using five Ni/Zr–Yb–O catalysts, containing 0, 0.5, 1.5,4.5 and 13.5 wt% Na^+, those are denoted as Cat-1, Cat-2, Cat-3, Cat-4 and Cat-5 respectively. It is found that the interaction between Ni and support determines the catalytic performance of Ni/Zr–Yb–O and the residual sodium content negatively affects the interaction between Ni and support. Cat-1 exhibits an excellent catalytic performance.During a long run time of 380 h, no deactivation is observed and both CO conversion and CH4 selectivity maintain a level above 90%. However, Cat-3 and Cat-5 suffer rapid deactivation under the same reaction condition. The characterization results indicate the strong interaction between Ni and support enables Cat-1 to possess well dispersed Ni species, resistance to sintering and carbon deposition and thus the excellent catalytic performance. However, the presence of sodium ions over Ni/Zr–Yb–O degrades the interaction between Ni and support and the catalytic performance, especially for the stability. The relative weak interaction between Ni and support results in severe sintering of both ZrO2 and Ni under the reaction condition, carbon deposition and the poor catalytic performance. 展开更多
关键词 CO METHANATION Ni/Zr–Yb–O catalyst Sodium content SYNGAS Stability
下载PDF
3D ball-type self-assemble CeO_(2) nanostructure produced by facile hydrothermal strategy for catalytic wet air oxidation of N,N-dimethylformamide 被引量:1
3
作者 Sajid Ali Yue Jiang +7 位作者 Zhirong Lai Peipei Zhang Songshou Ye Jiexiang Wang Jile Fu Nuowei Zhang jinbao zheng Binghui Chen 《Journal of Rare Earths》 SCIE EI CAS CSCD 2023年第8期1179-1188,I0003,共11页
CeO_(2)plays an important role in heterogeneous catalysis,and its performance is highly dependent on the oxygen vacancies and surface defects,which can be easily tuned by manipulating the particle dimensions and morph... CeO_(2)plays an important role in heterogeneous catalysis,and its performance is highly dependent on the oxygen vacancies and surface defects,which can be easily tuned by manipulating the particle dimensions and morphology.In this article,we report a facile strategy to synthesize a new type of CeO_(2)with modified surface property which can improve its ability to active oxygen.The obtained ball-type 3D selfassemble CeO_(2)(M-CeO_(2)) is composed of large amounts of small 1D crystals which are stro ngly connected with each other.Detailed characterizations confirm its morphology,particle size and improved reducibility with abundant fraction of Ce^(3+)and more surface active oxygen when compared with CeO_(2)-nanorods and CeO_(2)-nanocubes.In the catalytic wet air oxidation(CWAO)of N,N-dimethylfo rmamide,the total organic carbon(TOC)and total nitrogen(TN)conversion of M-CeO_(2)at 180℃in 3 h are 68%and 46%,respectively,which are higher than that of CeO_(2)-nanorods and CeO_(2)-nanocubes.Besides,M-CeO_(2) presents the lowest activation energy,which is related to its modified surface property.The good stability with consecutive four reactions of M-CeO_(2)in catalytic reactions suggests its potential application in CWAO processes for industrial wastewater treatment. 展开更多
关键词 Ethylene glycol NEUTRALIZATION 3D self-assemble CeO_(2) Ce^(3+)fraction N N-DIMETHYLFORMAMIDE Rare earths
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部