检索结果-南通市图书馆

Journal of Environmental Sciences 2022年第2期34卷 218-230页

作者： Qiongyang Zhou Ying Wang Xiaochen Wang Yuanqi Bai School of Energy and Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

Aiming to investigate the impacts of n-octanol addition on the Oxidation reactivity,morphology and graphitization of diesel exhaust particles,soot samples were collected from a four-cylinder turbocharged diesel engine fueled with D100(neat diesel fuel),DO15(85%diesel and 15%n-octanol,V/V)and DO30(70%diesel and 30%n-octanol,V/V).All tests were conducted at two engine speeds of 1370 and 2150 r/min under a fixed torque of 125 N·m.The soot properties were characterized by thermogravimetric analyzer(TGA),transmission electron microscopy(TEM)and Raman spectroscopy(RS).The higher volatile organic fraction content,lower soot oxidation temperatures and lower activation energy from TGA results indicated that both the increasing n-octanol concentration and engine speed enhanced the soot Oxidation reactivity.Additionally,quantitative analysis of TEM images showed that the soot derived from DO30 had the smallest primary particle diameters and fractal dimension,followed by those of soot produced by DO15 and D100.The RS results demonstrated that the n-octanol addition and higher engine speed led to a larger D1-FWHM(D1-full width at half maximum),A_(D1)/A_(T)(area ratio of D1 band and the total spectral)and A_(D3)/A_(T)(area ratio of D3 band and the total spectral)as well as a smaller L_(a)(crystallite width),revealing a lower degree of graphitization.Furthermore,the correlations between characterization parameters of soot properties and reactivity were nonlinear.

关键词： Oxidation reactivity Morphology Graphitization Diesel exhaust particles n-Octanol

维普期刊数据库

Morphology,Nanostructure,and Oxidation reactivity of Particulate Matter Emitted by Diesel Blending with Various Aromatics

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2023年第1期25卷 1-9页

作者： Yang He Li Bo Liu Shuntao Wang Yajun Zhang Ran Guo Lingyan SINOPEC Research Institute of Petroleum Processing Co. Ltd.Beijing 100083 State Key Lab of Engine Reliability WEICHAI Company

This study aims to analyze the influence of the polycyclic aromatic hydrocarbon(PAH)content in diesel on the physical and chemical properties of diesel soot particles.Four diesel fuels with different PAH content were tested on a 11.6 L direct-injection diesel engine.The raw particulate matter(PM)before the after-treatment devices was collected using the thermophoresis sampling system and the filter sampling system.A transmission electron microscope and Raman spectrometer are used to analyze the physical properties of the soot particles,including morphology,primary particle size distribution,and graphitization degree.A Fourier transform infrared spectrometer and thermogravimetric analyzer are used to characterize the surface chemical composition and Oxidation reactivity of soot particles,respectively.The results show that as the PAH content in the fuel decreases,the size of the primary soot particles decreases from 29.58 to 26.70 nm.The graphitization degree of soot particles first increases and then decreases,and the relative content of the aliphatic hydrocarbon functional groups of soot particles first decreases and then increases.The T_(10),T_(50),and T_(90) of soot from high-PAH fuel are 505.3,589.3,and 623.5℃,while those from low-PAH fuel are 480.1,557.5,and 599.2℃,respectively.This indicates that exhaust PM generated by the low-PAH fuel has poor Oxidation reactivity.However,as the PAH content in fuel is further decreased,the excessively high cetane number may cause uneven mixing and incomplete combustion,leading to enhanced Oxidation reactivity.

关键词： particulate matter aromatics morphology nanostructure Oxidation reactivity

维普期刊数据库

Comparative Study on Soot Reduction, Soot Nanostructure and Oxidation reactivity of n-heptane/DMC and Isooctane/DMC Inverse Diffusion Flames

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2020年第5期29卷 1269-1281页

作者： JIANG Bo PALADPOKKRONG Chutikarn LIU Dong MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China Advanced Combustion Laboratory School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China Jiangsu Province Key Laboratory of Aerospace Power System Nanjing 210016China

Dimethyl carbonate(DMC)is an environmentally oxygenated compound which can be used efficiently for soot reduction.This paper compared the soot reduction,soot nanostructure and Oxidation reactivity from inverse diffusion flames(IDFs)of the hydrocarbon fuels,namely n-heptane and isooctane doped with DMC.Effects of DMC additions on soot reduction were discussed.DMC addition is more effective for the soot reduction of n-heptane/DMC IDF than isooctane/DMC IDF.The morphology and nanostructures of soot particles were investigated by Transmission Electron Microscopy(TEM)and High Resolution TEM(HRTEM),and the soot graphitization and Oxidation reactivity were analyzed by X-ray Diflfraction(XRD)and Thermogravimetric Analyzer(TGA),respectively.The results of HRTEM images showed that many larger aggregates were observed for the structures of soot particles from IDFs with DMC additions.The soot particles exhibited more liquid-like material,more amorphous,higher disorganized layers,and less graphitic than that of IDFs without DMC additions.With increasing of DMC blending rate,soot particles changed younger to have shorter fringe length,higher tortuosity,and greater fringe separation.Based on the XRD and TGA results,the degree of the soot graphitization level decreased;the soot mass lost significantly faster,and the soot become more reactive.

关键词： inverse diffusion flame n-heptane/DMC isooctane/DMC soot reduction soot nanostructure Oxidation reactivity

维普期刊数据库

THE RELATIONS BETWEEN CARBON SPECIES AND PERFORMANCE OF Ni CATALYSTS FOR POM

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 1999年第4期 8-9页

作者： Zhou Jiping, Li Chunyi, Zhang Zhaobin, Shen Shikong (Laboratory for Catalytic Conversion of Natural Gas, Petroleum University, Beijing 102200)

Ｉｎｔｈｅｐａｒｔｉａｌｏｘｉｄａｔｉｏｎｏｆｍｅｔｈａｎｅ（ＰＯＭ）ｔｏｓｙｎｇａｓ，ｃａｒｂｏｎｄｅｐｏｓｉｔｉｏｎｏｎｔｈｅｃａｔａｌｙｓｔｃａｕｓｉｎｇｃａｔａｌｙｓｔｄｅａｃｔｉｖａｔｉｏｎｏｒｒｅａｃｔｏ... 详细信息

Ｉｎｔｈｅｐａｒｔｉａｌｏｘｉｄａｔｉｏｎｏｆｍｅｔｈａｎｅ（ＰＯＭ）ｔｏｓｙｎｇａｓ，ｃａｒｂｏｎｄｅｐｏｓｉｔｉｏｎｏｎｔｈｅｃａｔａｌｙｓｔｃａｕｓｉｎｇｃａｔａｌｙｓｔｄｅａｃｔｉｖａｔｉｏｎｏｒｒｅａｃｔｏｒｐｌｕｇｇｉｎｇｗａｓｒｅｐｏｒ...

关键词： carbon species methane partial oxidation temperatureprogrammed oxidation Oxidation reactivity