【摘 要】
：
Aiming to investigate the impacts of n-octanol addition on the oxidation reactivity,mor-phology and graphitization of diesel exhaust particles,soot samples were collected from a four-cylinder turbocharged diesel engine fueled with D100 (neat diesel fuel),
【机 构】
：
School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China
论文部分内容阅读
Aiming to investigate the impacts of n-octanol addition on the oxidation reactivity,mor-phology 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 elec-tron 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),AD1/AT (area ratio of D1 band and the total spectral) and AD3/AT (area ratio of D3 band and the total spectral) as well as a smaller La (crystallite width),revealing alower de-gree of graphitization.Furthermore,the correlations between characterization parameters of soot properties and reactivity were nonlinear.
其他文献
Arsenic (As) and antimony (Sb) are usually coexistent in mine wastes and pose a great threat to human health.The As immobilization by nano zero-valent iron (nZVI) is promising,how-ever,the stabilization for co-occurring As and Sb is not known.Herein,the i
This study investigated concentrations of PM2.5,PM10,SO2,NO2,CO and O3,and air quality index (AQI) values across 368 cities in mainland China during 2015-2018.The study further examined relationships of air pollution status with local industrial capacitie
Airborne fine particulate matter (PM2.5) is known to cause respiratory inflammation such as chronic obstructive pulmonary disease and lung fibrosis.NLRP3 inflammasome acti-vation has been implicated in these diseases;however,due to the complexity in PM2.5
The brown mussel Perna perna (Linnaeus,1758) is a valuable resource for aquaculture in trop-ical and subtropical coastal regions.It presents desirable characteristics for biomonitoring,including being sessile,widely distributed and abundant,and is a filte
With increasing pressure from anthropogenic activity in pristine environments,the com-prehensive profiling of antibiotic resistance genes (ARGs) is essential to evaluate the poten-tial risks from human-induced antibiotic resistance in these under-studied
Heavy metal (Cu,Mn,Zn,Pb,and Cd) concentrations were measured in the leaves of Sabina chinensis and Platycladus orientalis collected from urban,suburban,and rural sites in Tianjin,China.Photosynthetic pigment contents,reactive oxygen species content,malon
Arsenic (As) contamination poses an urgent environmental risk,and its removal from groundwater remains a challenge due to the lack of efficient adsorbents.Herein,a novel granular chitosan-titanium (CS-Ti) adsorbent was fabricated by the sol-gel method.Bat
High loads of ground-level ozone have occurred with the implementation of the Air Poilu-tion Prevention and Control Action Plan.However,the long temporal variation in precursor nonmethane hydrocarbons (NMHCs) has rarely been studied.In this study,we exami
External organic carbon sources are needed to provide electron donors for the denitrifica-tion of wastewater with a low COD/NO3-N (C/N) ratio,increasing the treatment cost.The economic strategy is to enhance the bioactivity and/or biodiversity of denitrif
The capping is called passive remediation because the sedimentary P was released and then immobilized by the capping materials.However,the release depends on the environmental conditions.Therefore,a hypothesis was proposed that the oxidant was used to acc