I'm working on photocatalytic water splitting. I have to measure the H2 production by an offline method using a GC-2552TG-FID-TCD. I want to design a suitable reactor for this purpose. I search and read some paper. I have some question.
1) Is it important that the reactor be vacuumed before the reaction or is it sufficient just purge the Ar before the reaction?
2) Is a 300 mL reactor suitable?
3) Is it important to add a pressure gauge to reactor?
4) Other than using a sacrificial agent, how else can the reaction between oxygen and hydrogen in the reactor be prevented? Is there a risk of explosion (because of H2 and O2 reaction) in a laboratory reactor? What should I do to prevent of such thigs?
1) I would recommend to purge the reactor with a reaction solution under the dark for at least 5 min.
2) the best would be to sample the headspace of your reactor. You will have a higher sensitivity at smaller ratio of headspace to liquid phase volumes. We described our reactor in Article Efficient Light-Driven Carbon-Free Cobalt-Based Molecular Ca...
and refs therein3) No
4) in electrochemical 2-compartment system. The yields of H2 are too low, no safety problem
Yurii V Geletii dear professor, thank you very much for your answers and article. It was really helpful.
With regard
Fatemeh
Yurii V Geletii dear professor, I'm really grateful for your answers and sharing the schematic of your reactor. It was really helpful.
With regard
Fatemeh
Photocatalytic H2 production is usually the wrong approach. If you make power you should put it on the grid and back out coal fired power production.
If you need H2 Steam-Methane Reforming is the best route (once you run out of byproduct H2 from Naphtha Reforming and Petrochemicals (mostly Ethylene) production.
Dear Rick Manner ,
I would say that "Photocatalytic H2 production is usually the wrong TERM." The correct would be : Photocatalytic water splitting into H2 and O2. This is a very unfavorable reaction, which requires to consume much energy. If this energy comes from sun-light, then we convert light energy into "storable" green energy. If the people are talking about the photocatalytic H2 production, commonly they mean a half reaction of water splitting. This is a pure basic science.
also if you ate foolish enough to split H2O. you should be sure to use the other product O2 probly for POX to produce more H2
Dear Rick Manner , I agree with you on the point about valorisation of produced O2, but not for POX. Hydrogen itself is not the goal, but the way to store solar energy. Pure oxygen is widely used in industry
Yurii V Geletii dear professor, you're right. I mean: Photocatalytic water splitting into H2 and O2. Actually, a half reaction of water splitting
Rick Manner dear Rick Manner, As you know, most hydrogen production processes are based on natural gas, coal, crude oil, or the electrolysis of water, and the application of most of these processes is limited because heat and electrical energy are required. Thus, photocatalytic hydrogen production using solar energy, a clean energy resource for the foreseeable future, is considered to be an attractive way of solving the global energy issue and environmental pollution. The overall water splitting by a photocatalyst under sunlight irradiation enables the production of environmentally friendly molecular hydrogen and does not use fossil fuel.
Fatemeh Sousani Photo voltaic electricity should be used to back down coal fired power generation. H2 should probably be produced via steam reforming of hydrocarbon.
Dear Rick Manner
The main point is not to produce H2 but to store solar energy in the form of chemical energy. Ideally, it would be a photocatalytic reduction of CO2 to a liquid fuel. The electrolysis using photo voltaic electricity is one of the way, but not a single way. You look at water electrolysis as a possibility to produce H2 for use in modern industry. We look at water splitting as an artificial photosynthesis. This is a pure basic science. "The basic science is the way to satisfy your curiosity using the tax-payer money."
- Badges
- Science topic
- Similar topics
- Biological Science
- Histology
- Fixatives