> we expect 50-60% overall efficiency at maturity What efficiency are you at now and what happens to your startup if you never reach that "maybe too optimistic" 50-60% goal?
Launch HN: Prometheus (YC W19) – Remove CO2 from Air and Turn It into Gasoline
181–190 of 589 posts
Re: Launch HN: Prometheus (YC W19) – Remove CO2 from Air and Turn It into Gasoline
#182Interesting proposition. 1. Why would your process be more cost effective and/or efficient than the commercially available processes for alcohol production? Surely if the magic sauce is the nanotube alcohol/water separation then conventional alcohol sources from fermentation will start using it at some point and will be able to produce same fuel but cheaper and/or more efficient. Maybe you can show that [photosynthes…
Maybe they could setup their devices around plants anyways tho.
Re: Launch HN: Prometheus (YC W19) – Remove CO2 from Air and Turn It into Gasoline
#183Earlier quoted context omitted.
There is no waste. The only inputs are water, CO2, and electricity. The only outputs are fuel and oxygen.
With respect, that answer skirts the question of what happens to the water. You said you're using the nanotube membrane to separate petro products from the water. What do you do with the water left over? What state is the water in when the process is complete? Potable? In need of treatment by traditional water treatment facilities?
Re: Launch HN: Prometheus (YC W19) – Remove CO2 from Air and Turn It into Gasoline
#184Earlier quoted context omitted.
Demonstrated overall conversion efficiencies for CO2 to fuels are already in the 25-50% range, depending on the fuel. We are confident we can get to at least 50% for our process. We will not be taking renewable power away from other uses - in the short term we'll be using marginally useful power (wind at midnight, solar at noon, etc), as we need the power to be low cost, and any time it has higher value uses, it won'…
Thanks for the reply, I get the load balancing part now, I did not think about that. I was thinking a lot recently about flying and how we could make it work in the (hopefully) greener future. This is definitely a more sensible way of doing it than electric jets, good luck with your company!
Re: Launch HN: Prometheus (YC W19) – Remove CO2 from Air and Turn It into Gasoline
#185Take a really hard look at your economics, in particular throughput and capital amortization (which scales proportionally to uptime!). Good comparison industries are chlor-alkali, fuel cell, and water-electrolyzer. Aqueous Cu catalyzed CO2 reduction - even if you are best in class for FY and efficiency and durability - have atrocious current densities, diffusion limited, by the standards of anything considered commercializeable.
Re: Launch HN: Prometheus (YC W19) – Remove CO2 from Air and Turn It into Gasoline
#186I read in the Bloomberg article that the machine itself hasn't yet created "enough gasoline to power his Golf even a single mile". I assume you've already made enough to power an engine in the separate steps? How long before you think you'd be able to make a video taking gas from the machine and pouring it into a tank?
Re: Launch HN: Prometheus (YC W19) – Remove CO2 from Air and Turn It into Gasoline
#187Here's what I don't understand - You're taking CO2 out of the atmosphere using renewable energy sources. Thermodynamically, this will take at least as much energy as it took to burn them. You did not mention how energy efficient your energy storage method is right now (50-60% at maturity sounds really optimistic, when plants are only a few %), but, in the short term, while we're still mostly using carbon-based fuels,…
Demonstrated overall conversion efficiencies for CO2 to fuels are already in the 25-50% range, depending on the fuel. We are confident we can get to at least 50% for our process. We will not be taking renewable power away from other uses - in the short term we'll be using marginally useful power (wind at midnight, solar at noon, etc), as we need the power to be low cost, and any time it has higher value uses, it won'…
Re: Launch HN: Prometheus (YC W19) – Remove CO2 from Air and Turn It into Gasoline
#188By law, gasoline gets cut with ethanol, degrading engine performance. If I buy gas from you guys will it be legal to put 100% gasoline into my engine? If so that's a "killer app," (so to speak) for people who care about their engines, even if it is more expensive in early development stages.
Re: Launch HN: Prometheus (YC W19) – Remove CO2 from Air and Turn It into Gasoline
#189Is this something that could be turned into a consumer-scale machine? I understand a lot of the high fuel cost on islands is simply from shipping the fuel there - producing it on site with this tech would be a huge benefit.
Re: Launch HN: Prometheus (YC W19) – Remove CO2 from Air and Turn It into Gasoline
#190even if it can compete with fossil fuel, do you think it will also be competitive with BEV?