Questions tagged [fuel]

Questions regarding fuels and the properties of fuels, like calorific value, octane number, mechanism of combustion, etc., should use this tag.

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Air Fuel Ratio Calculation of Unknown Gas [on hold]

I have no experience in chemistry. I don't need you to solve this answer but I have a gas that is: 2.9% Carbon Dioxide (percentage by mass) 3% Hydrogen 4% Carbon Monoxide and balance nitrogen. ...
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13 views

What Is The Heat Of Combustion Of Diesel And How Do I Find It? [closed]

I need help in finding the heat of combustion of diesel, no where online can i find it, and my chemistry teacher does not know how to find it....
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29 views

what are the cons of converting plastic to fuel

I have been trying to read how to fix plastic problems, there seems to be 3 outstanding solutions Re-use Recycle Decompose to Fuel Recycling is expensive, requires lots of water and the quality ...
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28 views

How do you find the heat capacity ratio of combustion products?

For example, if gaseous oxygen $(O_2)$ and paraffin wax $(C_{32}H_{66})$ were to stoichiometrically combust at STP, how would one go about finding the heat capacity ratio ($\gamma={c_p \over c_v}$) of ...
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64 views

About Smoke Grenades and Sugar Rockets

The most common formula for smoke grenades and sugar rocket fuel is $60\%\ \ce{KNO3}$ (potassium nitrate) and $40\%\ \ce{C12H22O11}$ (sugar). This is a 3:2 ratio, but I've also seen 2:1 and 5:3 with ...
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1answer
56 views

Why does hydrogen burn spontaneously in fuel cell at room temperature?

It's well known that if you mix $\ce{H2}$ and $\ce{O2}$ in ambient conditions, the $\ce{H2}$ will be stable indefinitely, and will only react with $\ce{O2}$ to form water when ignited by a flame. The ...
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1answer
27 views

Salt Bridge for Microbial Fuel Cell: Full or Partly Full?

I'm making a microbial fuel cell out of benthic mud and salt water in containers. My salt bridge will be made of agar and table salt solidified in PVC pipes. Does the salt bridge connecting the anode (...
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43 views

Remove ethanol from gasoline by mixing it with water?

I have read on forums that ethanol can be removed from commercial gasoline by mixing it with water, then draining water from the bottom to remove the water-ethanol solution (for example, with a ...
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1answer
225 views

Based on their respective number of degrees of freedom, what's the most efficient fuel; hydrogen or gasoline?

The reaction of octane's combustion is: $$\ce{2 C8H18 + 25 O2 -> 18 H2O + 16 CO2}$$ I am asked for computing the number of degrees of freedom of the octane given that its specific heat is $\pu{...
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25 views

Would an explosion of an electrically charged material be more powerful than if it were not charged?

I was recently reading a book titled "Hitler's Suppressed and Still Secret Weapons, Science and Technology". I came across this book because I saw it referenced by someone on another site. The book's ...
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792 views

Can a stoichiometric mixture of oxygen and methane exist as a liquid at standard pressure and some (low) temperature?

This answer to the question Pre-mixing cryogenic fuels and using only one fuel tank written by a non-chemist (me) begins with: At STP: LOX's boiling point is 90.19 K Methane's freezing ...
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1answer
188 views

Why is the auto ignition temperature of petrol higher than that of diesel? [closed]

I can't find any reasonable explanation please help.
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69 views

Is there a stable and non-toxic hydro-nitrogen-oxygen compound that's liquid in room temperature?

Is there a stable (i.e. does not turn into other substance when stored in a bottle exposed to the elements or explode/combust spontaneously or under mechanical impact) compound that contains just $\...
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20 views

Composition difference between #2 and #2D fuel oil

I have read that #2 and #2D fuel oil are essentially the same, but the #2D might have less sulfur. I have read others that say that #2 has a higher cloud point, so if that is true, then there are some ...
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38 views

Is it possible to turn food into fuel for a combustion engine? [closed]

According to McDonald's Nutrition Calculator page, the following order would contain 2480 kilocalories (or 10376 kilojoules): 1 x Double Bacon Smokehouse Burger 1 x Large Chocolate Shake 1 x Large ...
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1answer
38 views

How do you figure out fuel specific impulse non-experimentally?

Simple question, probably very complicated answer: Without building a test engine/rocket and finding out experimentally, that is to say, based on chemical characteristics alone, how can one compute ...
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1answer
668 views

Why do highly branched alkanes have higher octane numbers than their corresponding linear isomer?

The octane number of fuels are based on a set of primary reference fuels, which are mixtures of iso-octane and n-heptane. Now iso-octane being branched alkane has very less tendency to react and given ...
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1answer
69 views

Regarding interaction with metal sword and white gas

I have a large sword that is comprised of over 1000 layers of Titanium and High Carbon Steel. I wrapped it in Kevlar Wick and I set it on fire using Coleman White Gas (Camp Fuel) for performances. ...
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57 views

Would a hydrogen/oxygen fuel cell be a good choice for energy storage and generation in H2 rich atmospheric environments?

So imagine an atmospheric probe sent to enter the atmosphere of a giant gas planet. There would be no need to store hydrogen since a compressor or an inlet with sufficient dynamic pressure would allow ...
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1answer
39 views

Polluting agents generated by road traffic in a city [closed]

I want to measure the air quality according to road traffic in a city. What are the polluting agents (generated by fuel combustion) strictly related and generated by road vehicles that is worth ...
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1answer
90 views

Biodiesel synthesis

I want to do the synthesis of biodiesel with the cooking oil (it contains colza and sunflower oils) in ethanol and KOH. After 1 hour of reaction, I let the solution to rest for 3 days. At this stage,...
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2answers
175 views

What dangers/risks are there in the production of carbon subnitride?

I was reading that carbon subnitride or Dicyanoacetylene has one of the hottest flames when used as a fuel, but it also is unstable and can explode easily into carbon powder (no specifics on cause). ...
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1answer
54 views

Ethanol in gasoline — will it evaporate?

If gasoline with 10% ethanol is stored for a few weeks, will the ethanol evaporate? I have read that to check for ethanol in gas is to add a little water to a container; mark the level and add gas. ...
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1answer
216 views

How can we separate carbon monoxide from wood gas?

I am thinking about using open source wiki designs from allpowerlabs to construct a wood gas generator. The motivation came from experiencing a 10 day power outage after super storm Sandy. The ...
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1answer
59 views

Can we use liquid hydrogen to power a conventional engine? [closed]

Hydrogen has the best fuel efficiency, so if we were to use it in our engines wouldn't their efficiency increase as well. The engines would require changes and all but would it be plausible to have ...
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1answer
93 views

How do antioxidants work? [closed]

A friend and I are doing a project that involves the process behind manufacturing Jet A-1 and specifically the specifications highlighted in DEF 91-91. I was interested to see the information at the ...
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47 views

Can I approximate the CO concentration of a combustion product, if I know the CO2 and O2 concentration?

Assume I have the product (exhaust gas) from a combusted air/petrol mix. The mixing ratio was richer than stoichiometric (i.e., air:fuel < 14.67 in this case), so there was no excess of oxygen. I ...
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51 views

Could UV lasers be used to split CO2 and H2O?

I was wondering whether intense UV light, tuned to the correct wavelength, could be used to split carbon dioxide and water molecules as a first step towards synthesizing liquid fuels.
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1answer
415 views

Is the flame temperature of a burning fuel affected by pre-heating the fuel?

This page on Adiabatic temperatures helpfully lists the theoretical maximum temperatures that flames will reach under certain conditions for a number of fuels. They assume initial atmospheric ...
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270 views

Platinum-coated razor blades for making a fuel cell

My daughter wants to construct a fuel cell for a school project. Budget is tight and platinum as preferred catalyst expensive. I know that Gillette razor blades are coated with platinum. Would there ...
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1answer
154 views

Can hydrogen alone be used as a fuel? [duplicate]

I have always thought that fuel such as petrol, diesel, etc.. are getting burnt to move the pistons in the car (I am not bringing physics). Why not hydrogen be used as a fuel but I know the incident ...
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1answer
1k views

Why does diesel have a higher energy density than gasoline?

One of the primary reasons why hydrocarbons produce energy is the production of water during the combustion process. I've been trying to find out why diesel is considered to have a higher energy ...
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3answers
1k views

Number of electrons transferred & Gibbs free energy

To determine the number of electrons transferred for the following reaction: $$\ce{CH3OH + \frac{3}{2} O2 -> CO2 + 2 H2O}$$ I found the half reactions to be: $$\text{Anode: } \ce{CH3OH + H2O -&...
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1answer
95 views

Can plastic be used as fuel for vehicles? [closed]

I don't have much of a background in chemistry, but I know that plastics are largely made of carbon, as is oil. Is there any way to "covert", i.e. a plastic water bottle, into a substance that can be ...
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2answers
1k views

Will Ammonia react with Gasoline mixed with Ethanol?

Recently the South Koreans invented a car that runs on an 70% ammonia 30% gasoline fuel mix. (link) In America we already have instituted policies that require refueling stations to mix Ethanol ...
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1answer
754 views

HDPE bottle for gasoline?

What are the risks of storing E10 gasoline in a gallon HDPE container for a few months, vs storing in a proper plastic fuel can? Assuming the HDPE gallon is thick (used for Hydrochloric acid before, ...
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1answer
123 views

is there a filter to seperate glycerol and biodiesel?

i am currently working on a project of manufacturing biodiesel from cooking oils by the process "TRANSESTERIFICATION". at the end of this reaction, after the reaction mixture settles I have two layers ...
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2answers
2k views

Is liquid hydrogen rocket propeller pollution free?

If one searches for the different fuel types used in rockets, one can find that over the years, NASA and other space agencies have used both solid fuels and liquid fuels. I can see that more and more ...
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247 views

What can I use as a fuel for an engine with carbon dioxide as the oxidizer?

On Mars carbon dioxide is abundant. It is plausible to utilize a fuel in an engine that can use carbon dioxide as an oxidizer? I know this is a strange inquiry, but could a engine be made to use $\ce{...
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2k views

Removal of calcium from calcium-ammonium nitrate?

I am interested in model rocketry, and need to produce small quantities of pottasium nitrate. For this process I need ammonium nitrate, but I only have calcium ammonium nitrate. Is there a simple ...
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1answer
51 views

Usage of ammonia as odorant in fuel gases

Usually, thiols such as ethanethiol are added to fuel gases to warn the user of a leak. Why is a few percent of ammonia not used instead? Ammonia is flammable so it will burn to nitrogen and water in ...
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1answer
61 views

Why refine tar sands oil?

Why refine tar sands oil into petroleum and the rest of the oil processing byproducts rather than burning it directly in the furnaces of private residencies? At least in the snowbelt areas where gas ...
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83 views

Which one is the healthiest to operate a lantern with: kerosene, diesel or sunflower oil?

Given a lantern (originally made for kerosene) however, I'm looking for the fuel which is the safest for indoor use. I've already tried different kinds, and found three of them that burn just as ...
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85 views

Making solid fuel out of sugar

I recently tried to make a cheap solid fuel out of sugar. First I attempted burning the sugar cube directly, which did not work well even using a blowtorch. This was expected. Then I attempted to use ...
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2answers
799 views

Are fossil fuels and petroleum the same thing?

I've been reading articles about renewable energy, and in comments people talk about fossil fuels and petroleum as examples of non-renewable types of fuel. Sometimes they are used interchangeably, or ...
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1answer
120 views

Is it more economical to liquify natural gas to ship overseas or convert it to propane (C3H8) and ship it overseas?

Problem statement: Companies want to frack oil wells and then export natural gas overseas using transport via high pressure pipeline followed by liquefaction at a terminal port. If the methane ...
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346 views

Water-gas shift reaction without catalysts

I'm designing an experimental gas generator. The details are not really important here, but I want to convert a mixture of carbon monoxide, hydrogen and $\ce{H2O}$ gas to a safer form. I know the ...
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1answer
207 views

Release of sulfur dioxide from odored fuel gases

Often, fuel gases such as butane and natural gas (methane) are mixed with some foul-smelling impurities such as thiols (mercaptans) and hydrogen sulfide. Presumably, anything containing sulfur would ...
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3answers
987 views

Storage of methane in mineral oil or other liquid hydrocarbons

Is it practical (or even possible) to store gaseous alkanes such as methane or ethane in liquid non-polar solvents, such as mineral oil or vegetable oil, and how much more (or less) methane can be ...
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28 views

Is there a such thing as a reburnable gas or can one be created?

I want to know is there a such thing as a gas that can be reburned multiple times?