| Author | Message | |||||||
     Anonymous |
How can I make Hydrogen gas and then isolate it so it isnt mixed with any other gases while keepingit under pressure? | |||||||
| Andrew |
How about our good friend electrolysis? Try an internet search on that. And, of course, see this and this page. | |||||||
| Jacob (Jacob) New member Username: Jacob Post Number: 1 Registered: 5-2005 |
I know how to build the electrolysis devices but both gases go to the same conector, is it because I am using DC power and not AC? If any one has a diagram of the compression things used to liquify gases please e-mail or something. (Message edited by Jacob on May 18, 2005) | |||||||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 416 Registered: 12-2004 |
You have that backwards. Alternating current will produce hydrogen half the time, and oxygen the other half. Direct current will product hydrogen from one electrode, and oxygen from the other. | |||||||
| Jacob F. (Jacob) New member Username: Jacob Post Number: 3 Registered: 5-2005 |
Everytime I trie Direct all the gas comes from one electrode, I have only used 9-volts and a solar car charger to power it though. I might be wrong. By the way why does the water get all nasty and orange after I run it for a while? | |||||||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 417 Registered: 12-2004 |
Use pure water, with just a little vinegar in it, and carbon rods for the electrodes, so they won't react with the oxygen. Whatever you are using is probably reacting with the oxygen instead of letting it rise out of the water. From the sounds of it, you might be using iron electrodes. Don't do that. | |||||||
| Jacob F. (Jacob) Junior Member Username: Jacob Post Number: 4 Registered: 5-2005 |
Actually I was using galvanized screws as electrodes. | |||||||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 427 Registered: 12-2004 |
The zinc was quickly removed and you were using iron as the electrodes. The zinc is there to protect the iron by sacrificing itself. It died a noble death in vain. | |||||||
| Jacob F. (Jacob) Junior Member Username: Jacob Post Number: 5 Registered: 5-2005 |
I tried carbon rods, pieces of pencil lead actually, and it solved my problems. Thanks for the tip. Now I can construct a larger machine since I won't need to clean it out and replace the elecrodes constantly. | |||||||
| Andrew W. Hohol III Unregistered guest |
When using electrolysis,what is the weight ratio of Oxygen produced to Hydrogen? What is the volume ratio at equal stp? | |||||||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 506 Registered: 12-2004 |
Assuming that the entire volume of water has been consumed, so that no gas remains dissolved in the water, the weight of each gas will be the molecular weight of the substance times the number of molecules. There are two atoms of hydrogen and one of oxygen, so two molecules of water will produce one molecule of oxygen and two molecules of hydrogen. The atomic weight of hydrogen is about 1, and the atomic weight of oxygen is about 8, and both molecules are diatomic, so the ratio by weight will be 1 to 4 (4 hydrogen atoms of weight 1 each, to 2 oxygen atoms of weight 8 each, or 4 to 16, or 1 to 4). The volume of a gas is proportional to the number of molecules of the gas. Since there are two molecules of hydrogen for every one molecule of oxygen, the volume of the hydrogen will be twice that of the oxygen. Be aware that your teacher knows about this web site, so it is not the best place to ask for homework answers when your grade depends on original research. | |||||||
| Jake (Unregistered Guest) Unregistered guest Posted From: 72.235.129.42 |
Is the electrolysis gas oxygen and hydrogen a very dangerous mix ? | |||||||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 840 Registered: 12-2004 |
As dangerous as hydrogen and oxygen get. It is explosive, and after that, you could drown in it. | |||||||
| mkg (Unregistered Guest) Unregistered guest Posted From: 203.101.123.190 |
what is the volume to weight ratio of hydrogen?? | |||||||
| pip (Cowtipz88) New member Username: Cowtipz88 Post Number: 1 Registered: 5-2006 |
Hey guys i am doing a project where i am making a hydrogen powered gun and a system that gets me the gas... well just look for your self. Hydrogen Fuel Cell(Make the Hydrogen and Oxygen)
Holding Area (Where the gas goes until needed)
Pressurazation (I do this to later for the gun and pack the gas in)
Gas Pods (Easy for transfortation)
Hydro Gun (Thats what I call it)
And that is im hoping i will get a good bang since it is pure oxyggen and hydrogen mix in the gun) So guys tell me what you think i will put real pics of it later. | |||||||
| Dee Millir (H2believer) New member Username: H2believer Post Number: 1 Registered: 12-2006 |
I am working with hydrogen generation in hopes to apply it to my automobile system. So far my problem is being able to generate enough to utilize and still not draw a large amount of electricity in doing so. | |||||||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 1598 Registered: 12-2004 |
The amount of electrical energy needed to split water into hydrogen and oxygen is easy to calculate. It takes two electrons to split a water molecule. There are 6.2415 times 10 to the 18th electrons in a coulomb. There are 6.02214199 times 10 to the 23rd molecules (called one mole) in 18 grams of water. Thus it takes about 48 thousand coulombs to split 18 grams of water. To do that with 100 watts takes about 40 minutes. The total energy needed is 237,130 joules (65 watt hours) for those 18 grams of water, and you get one mole of hydrogen (2 grams) for that effort (22.4 liters). When you burn that hydrogen in air, the most energy you could possibly get is 237,130 joules. But an internal combustion engine gets perhaps 20% efficiency, so you get maybe 50,000 joules (13 watt hours) of energy. If you are using a battery in the car to make the hydrogen, you are MUCH better off having the battery turn an electric motor at 85% efficiency. So, we will assume that you are generating the hydrogen from the power grid at home, and storing it in a big tank towed behind the car. A gallon of gasoline has 130 million joules. A kilogram of hydrogen has 119 million joules, about the same as a gallong of gas. At atmospheric pressure, that's 11,200 liters (about 3,000 gallons). At 1,000 psi, it's about 45 gallons, but that is an awfully high pressure. A kilogram of hydrogen costs you 33 kilowatt hours to produce. If you are using 1,000 watts in the electrolizer, thats 33 hours to produce. Using electricity at that rate costs about 15 cents per kilowatt hour at residential rates, so the kilogram of hydrogen costs you about $5 if your electrolyzer is 100% efficient, or twice that for something realistic. So, in terms of gasoline, your energy is costing you about $10 per gallon. | |||||||
| Dee Millir (H2believer) New member Username: H2believer Post Number: 3 Registered: 12-2006 |
We are working with adding hydrogen to our fuel. We would like to know if adding hydrogen to our gasoline carburetor would give more efficient burning of the fuel. Right now were generating hydrogen and oxygen gases combined. No accidents yet, also will try using ammonia. We have also used ammonia mixed with baking soda and water, which seems to explode more safely. Are there any other materials I should be working with for more efficient electrodes, also, we are using baking soda for an electrolyte, is there something more effective? My system currently consists of 24 stainless steel plates connected in series in 5 separate cells using 12 volts. It seems to generate a little heat which is a big improvement over the previous single cell model which drew too much current producing waste heat, now we are only drawing only 10 amps for the same amount of gas. Some of the current progress: http://img351.imageshack.us/img351/9964/h2gen081zk1.jpg | |||||||
| Michael (Michaelt) Senior Member Username: Michaelt Post Number: 138 Registered: 12-2005 |
The efficiency of burning a fuel depends on the amount of oxygen. By adding hydrogen to your gasoline, you are adding more fuel, not more oxygen. Hydrogen also burns somewhat explosively compared to gasoline-- a gasoline engine is designed such that the gasoline is not exploded, but burned (so you get a prolonged expansion of gases rather than an instantaneous expansion.) When your engine knocks and pings, it is due to the fuel mixture igniting too soon or igniting on time but expanding too quickly (hence some engines having specific octane requirements.) Remember that when hydrogen burns, water is the ash. While the temperatures in an engine and the exhaust system can get quite high and prevent liquid water from collecting in the system, there may be instances where you will end up with water in the oil or in the exhaust system that wouldn't ordinarily be there, increasing the speed at which the motor oil breaks down or accelerating the rusting out of the exhaust system. |
Hydrogen Fuel Cell