What if we turn CO2 into fuel or explosives?

"Researchers in Japan developed a fast, efficient method to convert CO₂ into carbon monoxide using a low-cost catalyst, cutting processing time from 24 hours to just 15 minutes. Their spray-based technique not only meets industrial standards but also outperforms all previous similar catalysts, offering a major step forward in sustainable fuel production."(CoPc) crystals. Credit: Hiroshi Yabu et al." (ScitechDaily, New Tech Turns CO₂ Into Fuel in Minutes)

Turning CO2 into fuel is one of the most interesting things that can slow the greenhouse effect. The system must only separate carbon from oxygen. And then keep those atoms close enough that they can burn. The problem has been how to make that in real life. There is the possibility to make "explosive diamonds" by using some new technologies. 

There is the possibility. That the next-generation aerial vehicles use carbon as fuel. In those systems, carbon can be packed into the nano-size particles. Those particles can be smaller than the smoke. The engine conducts that nano-smoke into the combustion chamber. 

"Fabrication method of gas diffusion electrodes modified with metal phthalocyanine crystals, and the characteristics and performance when using cobalt phthalocyanine (CoPc) crystals. Credit: Hiroshi Yabu et al." (ScitechDaily, New Tech Turns CO₂ Into Fuel in Minutes)

Then the system injects pure oxygen into them. 

The system must only make the carbon crystal there are oxygen atoms between carbon atoms. That kind of thing can give a very high-power explosion. There is a test using carbon-oxygen chains to create new types of very effective explosives that can beat even the RDX. The problem is that the new explosives don't need even nitrogen to catalyze the reaction. 

"Image. Graphical abstract of the Skoltech study showing some of the possible carbon oxides in the range probed by the researchers: no more than 16 oxygen atoms, possibly zero atoms of either element. Credit: Elizaveta Vaneeva et al./Materials Today Energy" (ScitechDaily, Rivaling TNT: Scientists Discover Bizarre “Magic Molecules” With Explosive Potential)

In those explosives, the reaction where carbon joins oxygen happens in so large area. Where the explosion is powerful. We can think possibility of making a molecule like graphene. But in that molecule, every carbon is connected with oxygen. 

If oxygen joins carbon at the same time over the entire layer. That gives a powerful explosion. The number of carbon and oxygen atoms that participate in chemical reactions at the same time determines the burning speed and power of the explosions. 

And that makes them slip through explosive detectors. 

Carbon-oxygen chains can also make it possible to create new types of rocket fuels. That rocket fuel fits into new nanotechnical aerial vehicles. Nanotechnology can make carbon-oxygen ladder molecules that the system drives to the combustion chamber. The system can keep that explosive in roll there the engine feeds it into the engine chamber. 

https://scitechdaily.com/new-tech-turns-co₂-into-fuel-in-minutes/

https://scitechdaily.com/rivaling-tnt-scientists-discover-bizarre-magic-molecules-with-explosive-potential/

New Chinese ramjet uses magnesium-burning afterburner.

"Chinese researchers have reportedly developed a new type of afterburner for scramjet engines that could achieve Mach 6 at altitudes of 98,425 feet (30 km). According to the team behind it, this was achieved by cleverly incorporating magnesium powder into the hot exhaust gases produced by burning conventional jet fuel." (Interesting Engineering, China’s magnesium-powered scramjet breakthrough nearly doubles thrust at Mach 6)

Chinese use magnesium in the engine's afterburner there the exhaust gas ignites it. The magnesium can also be delivered into the engine as the magnesium tape. That tape increases temperature similar way as the electric arcs increase temperature in electric jet engines. 

There is the possibility that the electric arcs along with the microwave systems can inject magnesium powder. That makes the system capable of using magnesium as its fuel in the entire engine. 

During the WWII. German researcher Dr. Alexander Lippisch invented a supersonic aircraft that used carbon as fuel. The idea was that the ramjet engine burn carbon powder as fuel. The problem with that Lippisch P.13a plane was that the particle size of the carbon was too big. It is sometimes suggested that gunpowder with very small particle sizes can also be an effective fuel for ramjet engines. 

"Model of Lippisch P13a at the Technik Museum Speyer"

"The solid-fuel powered P.13 was one of several distinct Lippisch design studies to be so designated and became identified as the P/13a. It underwent much the same variations of form as the P.12, being presented in a brochure with the large fin and integral raised cockpit, and with an articulated, double-hinged landing skid. The wing trailing edge is angled slightly forwards and the downturned tip surfaces have been discarded. The outer wing sections could be folded upwards for transportation by rail" The engine was successfully tested in Vienna.  (Wikipedia, Lippisch P.13a)

In hydrogen-powered jet planes, the hydrogen-producing unit or electrolytic system can be in the airplane.

The aircraft will fill its tanks with water. And then the electrolytic system will break those water molecules. The system can get that electricity from any electric source. So the operators must only connect the electric wire to the airplane. Or if those people have time they can cover their aircraft using solar panels that create needed electricity. 

Lippisch got that idea from the dust explosions where the dust with a large fire surface will detonate. Those dust explosions destroyed many mills. So the ramjet engines can theoretically use any powder as fuel. The carbon or molecular-size carbon powder can explode giving thrust. In fact, even wheat flour to give thrust if the size of the powder particles is small enough.  If we want to make a ramjet or scramjet engine that is carbon-free, we must use some fuels that don't involve carbon. 

So, the answer to that problem can be in metals like magnesium. Or metal compounds like electrons. If the particle size of the metal- or metal-iron oxide compound is small enough the system can spray that metal powder to the ramjet engine. The electron is a compound of magnesium and iron oxide. And that chemical compound can give very high thrust to the engine. Because fuel itself involves oxygen that system allows the ramjet to operate also outside the atmosphere. Magnesium powder can be a good alternative to normal hydrocarbon. Or, at least Chinese research that thing as fuel. 

https://interestingengineering.com/innovation/chinese-team-develop-new-magnesium-afterburner?group=test_b

https://en.wikipedia.org/wiki/Lippisch_P.13a