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UiO-66, a kind of Metal-organic framework materials (MOFs) was used as a support for nano-palladium particles (i.e., Pd-UiO-66) which was used in the catalytic hydrogenation of phenol in aqueous media in this work. The performance of Pd-UiO-66 was compared with Pd-UiO-66-NH2, in which the UiO-66 support had been modified through the introduction of NH2 groups. Pd-UiO-66 and Pd-UiO-66-NH2 were characterized...
The experimental research on reducing unregulated emissions (included unburned methanol, formaldehyde, formic acid, 1,3-butadiene, benzene and toluene) of diesel/methanol dual fuel (DMDF) engine with different after-treatment devices was carried out on a turbocharged inter-cooling diesel engine. The DMDF engine was operated under 25%, 50%, 75% and 100% of full load at the engine speed of 1660rpm and...
An experiment was carried out in a direct injection spark ignition (DISI) engine to research the effect of aromatics, especially the heavy aromatics (aromatics with c≥9) content on the characteristics of in-cylinder combustion and engine-out ultrafine particle. The results show that total aromatics and heavy aromatics content all have a limited effect on in-cylinder combustion. But the ultrafine particle,...
Experimental study was conducted on a compression ignition engine to investigate into the effects of methanol substitution percent (MSP), injection timing, intake air temperature (Ti), exhaust gas recirculation (EGR) and other parameters on the ultrafine particle emitted from the engine. The testing engine was run on the mode of Diesel/methanol dual fuel, which was modified from a turbocharged, inter-cooling...
Methanol fumigation strategy in multi-cylinder diesel engine has received great attentions in recent years. Experimental work was conducted in a turbocharged inline 4-cylinder diesel engine fueled with diesel methanol dual fuel (DMDF). Three different methanol injection positions were chosen to investigate into their effect on cylinder-to-cylinder variation. The results indicate that the unevenness...
Utilization of hydrous ethanol in diesel engines is beneficial not only for reducing the exhaust pollutant emissions but also for improving the lifecycle fuel efficiency including both in engines and refineries. However, so far detailed investigations on spray combustion characteristics of hydrous ethanol diesel emulsified fuels are rarely reported, though this information is crucial in combustion...
A diesel engine with 6-cylinder, turbocharged intercooling and common rail system was modified to operate on diesel/methanol dual fuel (DMDF). To optimize combustion process at high methanol substitution ratio (MSR) and further decrease exhaust emissions of DMDF engine at low load condition, pilot injection strategy was applied on it and the combustion, regulated and unregulated gaseous emission (included...
Thermal properties of gas hydrate-bearing sediments directly govern the heat transfer process during hydrate decomposition which couples with phase transitions and multiphase flows. The effective thermal conductivity of a multiphase system represents the composite capacity to conduct heat. Here we report on point heat source measurements of the effective thermal conductivity of methane hydrate-bearing...
The methanol fuel used in diesel engine can reduce the emissions effectively, while the performance of engine keeps unchanged or even improved, the study of methanol used in diesel engine is paid more and more attention. Experiments were conducted in a 4-cylinder, turbocharged direct injection diesel engine fueled with diesel/methanol dual fuel (DMDF). In the experiment, methanol was injected into...
An experimental study was conducted to investigate into the cyclic variations of diesel methanol dual fuel (DMDF) combustion on a methanol fumigated diesel engine. The effects of engine load, methanol substitution percent (MSP), injection timing and intake temperature on cyclic combustion variation were studied experimentally. In-cylinder pressure of 100 consecutive combustion cycles were recorded...
This paper presented the analytical results for the energy balance of a diesel methanol dual-fuel (DMDF) engine. A methanol injection system was fixed on a diesel engine and let the engine to alternate to run in either the pure diesel (D) mode or DMDF mode. Primary application of the thermal balance analysis was to investigate the cause of methanol replacement ratio SR changing with engine loads....
Diesel–methanol dual fuel (DMDF) engines at light loads suffer from low thermal efficiency and high unburned percentages of fuel. Pilot fuel injection timing and intake temperature are two important parameters which affect the combustion process in DMDF engines. In present experimental work, the combined effects of intake temperature and injection timing on the performance of a DMDF engine have been...
Effects of titania on the catalytic property of Pd/Al 2 O 3 towards methane combustion were examined. The results revealed that the catalytic activity of the Pd/Al 2 O 3 catalyst was considerably improved by pre-coating the alumina support with titania at low temperature (below 700 o C). Hydrogen chemisorption and BET measurements revealed that the titania-modified...
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