Imagine a car that doen't need gas!!

It is, but only if you assume that all of the large amount of talk that would have to precede proof-of-concept vehicles' construction, you would not be privy to ...

I should disclose that I'm the main boron fan. I wrote the crap about silver filters; I have learned more since. Zeolite PSA will do the job, just barely. It's plenty efficient enough, but big and heavy. This rather hard-to-read paper --

--makes me think the principal impurity in PSA-produced oxygenis argon, not nitrogen as I say at . 'dbs_use' points out a real difficulty with the use of enriched oxygen in an open cycle, where the working fluid/oxidant goes through once, and as said, the volume rate would typically be thousands of litres per minute.

However, the 100 kW of minus-delta-'G' that a car motor turns into 20 or 30 kW at the drive wheels requires, if the fuel is octane, that per minute only about 320 zero-Celsius 1-atm litres of oxygen react. If it is boron, about 170.

So the semi-closed cycle, by replacing only the oxygen that actually reacts or leaks, very much -- about 40 times, I guess, -- reduces the oxygen supply problem, and changing the reductant from octane to boron reduces it almost twofold again.

(The reduction would not be so good if the replacement for octane, a C-H compound, were a B-H compound. But it's not. Just boron, no hydrogen at all.)

--- Graham Cowan, former hydrogen fan

as energy carrier: real-car range, nuclear cachet