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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Is a hydrocarbon bio-battery feasible?

Hydrocarbons have some of the highest energy densities and specific energies of any chemical fuel. Unfortunately, our primary use of them is in thermal engines, whose efficiency is limited by Carnot'...
Lawnmower Man's user avatar
7 votes
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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 ...
Christopher Marley's user avatar
6 votes
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How well the conclusion from the "Ignition!" book on rocket fuel science stood the test of time?

There was a wonderful book called "Ignition!" by John D. Clark, published around 1972, very interesting to read. That book covers the history of the rocket fuel development in the middle of ...
hijarian's user avatar
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Why do branched hydrocarbons burn more efficiently (complete & clean combustion)?

Branched and cycled hydrocarbons usually a higher octane number than their straight chain counterparts. This is due to a more complete and clean (no residue) combustion. In addition, there is no ...
Dwiparna Datta's user avatar
3 votes
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Is it possible to have a negative overall activation energy for a whole reaction mechanism?

I am trying to find out correlation for ignition delay for alkane fuels. The activation energy part of the correlation gives me a negative value. For the ignition delay formulation, is it possible to ...
Pragnesh Rana's user avatar
2 votes
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Would a PNG geyser work on biogas?

I am trying to understand if a water heater designed to run on piped natural gas (PNG) could be powered by biogas without any modifications. Typically, these geysers have a battery-powered ignition ...
Chethan S.'s user avatar
2 votes
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2k views

Equation of combustion of heavy fuel oil (HFO)

We are researching the use of heavy fuel oil (HFO) on ship vessels, but are having trouble finding the equation of the chemical combustion process of HFO. I understand that it contains long chains of ...
Thomas Wagenaar's user avatar
2 votes
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What reactions involving hydrazine, dinitrogen tetroxide and possibly a contaminant can produce a salt?

Hydrazine $\ce{N2H4}$ and dinitrogen tetroxide $\ce{N2O4}$ form a hypergolic fuel and oxidizer pair widely used in spacecraft including Akatsuki (あかつき, 暁, "Dawn") also known as the Venus ...
uhoh's user avatar
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2 votes
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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 ...
Gaurav Shah's user avatar
2 votes
0 answers
165 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 $\...
Meatball Princess's user avatar
2 votes
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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.
John Eastmond's user avatar
2 votes
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725 views

Is white phosphorus really a cool burning fuel?

About 11 months ago, I posted a question on this SE site on cool flames. One of the answers mentioned white phosphorus. However, a few weeks earlier, I played a game called Spec Ops: The Lines, in ...
Nzall's user avatar
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Does polyamide react with hydrocarbons (group III engine oil) in its thermoplastic state?

I need to form (bend) thermoplastic polyamide hose in rubber jacket to a desired shape. I can use heat gun but I thought for better results I could use heated to 150C group III engine oil (your ...
Yoda's user avatar
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how to make a PEM (proton exchange membrane) out of Nafion Dispersions?

I would like to use a Nafion membrane for a fuel cell project, but the Nafion sheets are hard to integrate. Therefore, I would like a gel type of Nafion that can take the shape of the container I put ...
Anwer Ak's user avatar
1 vote
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367 views

What is the explanation of negative temperature coefficient in ignition delay of a fuel?

When studying the ignition delay of a fuel, some fuel have a negative temperature coefficient area (NTC) where an increase of initial temperature of the mixture air/fuel produces an increase of the ...
Jonses's user avatar
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Are there any chemical pathways or catalysts that could produce electricity from fossil fuels without combustion?

While fossil fuels are dense in energy, I have known only one way to retrieve energy from them, namely, to burn them. I wish we could have a way to get energy from them without combustion. Is there ...
Thaina's user avatar
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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 ...
user73910's user avatar
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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 ...
Bart's user avatar
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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 ...
Kemmer's user avatar
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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 ...
tom's user avatar
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1 vote
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141 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 ...
sadljkfhalskdjfh's user avatar
1 vote
0 answers
452 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 ...
sadljkfhalskdjfh's user avatar
1 vote
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1k views

Hydrazine vs 1,1-dimethylhydrazine for rocket fuel?

The question in my textbook is as follows: Hydrazine and 1,1-dimethylhydrazine both react spontaneously with O2 and can be used as rocket fuels. $$\ce{ N2H4(l) + O2(g) -> N2(g) + 2H2O(g)}...
Blargian's user avatar
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Thermodynamic-Fuel and efficiency

Why is the maximum theoretical efficiency of Ar engine higher than that of Nitrogen engine? On a molecular level. For an Otto Cycle $\mathrm{Eff} \le\left(1-r^{1-\gamma}\right)$ $\gamma=\dfrac{C_p}{...
Thinh L's user avatar
  • 51
1 vote
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Fuel Cell Chart - Anode, Cathode, Electrolyte

Can someone please check my table to make sure I have the correct information. I am especially unsure of the parts highlighted in yellow:
confused's user avatar
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1 vote
1 answer
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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 ...
Emmett P's user avatar
0 votes
0 answers
447 views

Could you use All-Purpose Flour as a model rocket fuel?

I'm building a model rocket, and I'm trying to find a good fuel. I've done a lot of research and I know about r-candy and the aluminum-ammonium fuel, but I was wondering, before I made any of these, ...
Blue Herring's user avatar
0 votes
0 answers
158 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 ...
David Lu's user avatar
0 votes
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610 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 ...
Shaka Boom's user avatar
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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 ...
Shaka Boom's user avatar
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0 votes
0 answers
330 views

How quickly will steel lose structural strength from a heat flash?

I want to know if a sustained jet fuel burn around steel has the ability to make the steel structurally unsound. It seems like any applied heat that effects steel will be a kind of "heat flash": a ...
sharpCodes's user avatar
0 votes
0 answers
438 views

Could the net equations for burning hexene be used as a means of energy source?

$6\ce{CO_2} + 6\ce{H_2O}\xrightarrow{some\;catalyst}9\ce O_2 + \ce{C_6H_{12}}$ $\ce{C_6H_{12}} + 6\ce O_2\to 6\ce{CO_2} + 6\ce H_2$ $6\ce H_2 + 3\ce O_2\to 6\ce{H_2O}$ At one point, I had made a ...
LewdLime's user avatar
  • 117
-1 votes
1 answer
81 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. ...
Spencer's user avatar
  • 21
-1 votes
1 answer
179 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 ...
Pavan Kalyan's user avatar
-2 votes
2 answers
67 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 ...
rodv92's user avatar
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