Latest / The Manufacturing Podcast with Fexingo: Factories, Supply Chains, and Industrial Business / How a German Factory Is Making Hydrogen from Plastic Waste
Transcript
- Lucas: Luna, I want to start with a number that really stuck with me. A pilot plant just outside Munich is processing two metric tons of mixed plastic waste per day — stuff that would otherwise go to incineration — and turning it into hydrogen gas and solid carbon. No sorting, no washing, just shredding and microwave energy. Luna: Wait — microwave energy? Like the same thing that heats my leftover curry? Lucas: Exactly the same physics, but scaled up by a factor of about a million. The company is called PyroH2 — I'll put a pin in the name — and they've built a pilot reactor that uses microwave pyrolysis. The microwaves target the carbon-hydrogen bonds in the plastic, breaking them apart at around 800 degrees Celsius, but without the oxygen that would create dioxins or CO2. Luna: So the output is hydrogen and solid carbon. What form does the carbon take? Lucas: It comes out as a fine black powder — essentially graphite-grade carbon, about 95 percent pure. They can sell that to industrial buyers who use it in lubricants, battery anodes, even as a filler in rubber. The hydrogen they compress and sell into the local industrial gas market at about three dollars fifty per kilogram. Luna: That hydrogen price is interesting. Green hydrogen from electrolysis is usually around five to seven dollars a kilo, right? Lucas: Right. So this is immediately competitive, even at pilot scale. And the feedstock — mixed plastic waste — is essentially free, sometimes they even get paid a small gate fee to take it. The economics improve dramatically as they scale. Luna: But how much of that plastic actually converts to hydrogen? I know traditional gasification of plastic yields a syngas that's maybe 40 percent hydrogen. Is microwave pyrolysis different? Lucas: It is. PyroH2 claims about 70 percent of the hydrogen in the plastic ends up as H2 gas, with the rest locked in the carbon solid. That's a much higher selectivity than gasification, where you get a mix of CO, CO2, methane, and hydrogen that needs further separation. Here, the hydrogen stream is over 99 percent pure — no scrubbing needed. Luna: So the carbon capture is built in, essentially. You're not emitting the carbon, you're selling it. Lucas: That's the big selling point. They're not just displacing fossil hydrogen; they're sequestering the carbon in a solid product. If the carbon ends up in, say, a rubber seal that lasts twenty years, that carbon is out of the atmosphere for two decades. Compare that to incineration, where every ton of plastic releases about three tons of CO2. Luna: What kind of plastic can they handle? Because we all know recycling plants hate mixed waste. Lucas: The pilot can handle anything that's mostly hydrocarbon — polyethylene, polypropylene, polystyrene, even some PVC, though PVC creates hydrochloric acid that they have to scrub out. What they can't take is PET — the stuff in water bottles — because the oxygen in the polymer chain messes with the microwave absorption. But PET is already mechanically recyclable, so that's less of a loss. Luna: So the sweet spot is the stuff that mechanical recycling can't handle: films, multilayered packaging, takeout containers with food residue. Lucas: Exactly. That's about 40 percent of the plastic waste stream globally. PyroH2's process doesn't care if the plastic is dirty or mixed. They just shred it to about ten millimeter flakes, feed it into a screw reactor, and hit it with microwaves. The whole process takes about three seconds. Luna: Three seconds? That's fast. How much energy does the microwave generation consume? Lucas: The pilot uses about 3.5 kilowatt-hours per kilogram of plastic. That's roughly twelve megajoules per kilo. The hydrogen they produce has an energy content of about 142 megajoules per kilogram, so they get a net energy gain — but you have to factor in the electricity cost. At German industrial electricity prices of around twenty cents per kilowatt-hour, the energy cost per kilo of hydrogen is about seven dollars. But remember, they also sell the carbon, which offsets a big chunk of that. Luna: So the carbon revenue is key. What's the carbon worth? Lucas: Graphite-grade carbon powder sells for about one to two dollars per kilogram. For every ton of plastic, they get about 300 kilograms of carbon and 100 kilograms of hydrogen. So the carbon alone brings in three to six hundred dollars. The hydrogen at three fifty per kilo adds another three fifty. Total revenue around six fifty to nine fifty per ton of plastic. Feedstock cost is near zero. The economics start to look pretty solid at scale. Luna: I want to believe this, but I've seen a lot of chemical recycling hype that never scaled. What's different about PyroH2's approach? Lucas: Fair question. Most chemical recycling — like pyrolysis to oil — produces a low-quality oil that needs further refining, and the economics only work at very large scale, like a hundred thousand tons per year. PyroH2's microwave approach is modular. One reactor module handles two tons per day. You stack modules. A fifty-ton-per-day facility would have twenty-five modules in parallel. That means they can build incrementally, prove the technology at small scale, and expand without massive upfront capital. Luna: So lower risk for investors. Have they announced any scale-up plans? Lucas: They just secured a grant from the German Federal Ministry for Economic Affairs to build a ten-ton-per-day demonstration plant, which should be operational by early 2027. That plant will process plastic from local municipal collection that currently goes to incineration. If it hits the performance targets, they're already in talks with a waste management company in the Netherlands to license the technology for a hundred-ton-per-day facility. Luna: A hundred tons per day — that's getting into serious waste disposal territory. How does that compare to a typical incinerator? Lucas: A medium-sized waste to energy incinerator processes about five hundred tons per day, so a hundred tons is significant but not massive. The key difference is the output: instead of electricity and CO2, you get hydrogen and solid carbon. And the hydrogen can be used in fuel cells, trucks, or industrial processes. Germany is building out a hydrogen grid, and they need all the clean hydrogen they can get. Luna: One more question on the carbon quality. You said 95 percent pure graphite. Could it be upgraded to battery-grade graphite? Lucas: Potentially. Battery-grade graphite requires 99.9 percent purity. PyroH2's carbon is already 95 percent, so further purification is possible — but that adds cost. For now, they're targeting industrial markets where 95 percent is fine. But if the carbon market evolves, that's an upside option. Luna: This feels like one of those innovations that could actually work because it solves two problems at once: plastic waste and clean hydrogen production. But I'm still skeptical of the energy balance at scale. Lucas: The energy balance is definitely the thing to watch. The pilot data is promising, but we need third-party validation. The ten-ton-per-day plant will be a real test. If they can maintain the same efficiency at ten times the scale, this could be a game-changer for the waste and hydrogen industries. Luna: Speaking of industries, if these conversations have moved your work forward in some small way, we want to mention that listener support is what keeps this show ad-free and independent. Lucas: Yeah, it's a small operation. A couple of dollars a month is genuinely what keeps these going — buy me a coffee dot com slash fexingo, if you've gotten something out of them. Luna: No pressure, just if it's useful to you. And now back to the future of plastic waste. Lucas: Right. So let's talk about the broader context. The European Union's Waste Framework Directive is pushing for 65 percent recycling of plastic packaging by 2030. We're nowhere near that — current mechanical recycling rates are around 30 percent. Chemical recycling technologies like PyroH2's can fill that gap, but they need to be proven at scale. Luna: And the hydrogen piece is also politically important. Germany's National Hydrogen Strategy targets 10 gigawatts of electrolysis by 2030, but that's falling behind. PyroH2 offers a way to produce hydrogen without building new renewables capacity, using waste as an energy source. Lucas: Exactly. It's not a silver bullet, but it's a bridge. And the beauty is that it can be deployed locally — a reactor module could sit behind a supermarket, processing its own plastic waste and fueling a hydrogen van. That kind of distributed model could reduce transportation costs and emissions. Luna: Are there other companies working on microwave pyrolysis for plastic? Lucas: A few. A startup in Japan called Microwave Chemical has a similar process. And there's academic work at the University of Cambridge and the University of Sydney. But PyroH2 seems to have the most advanced pilot in Europe, with a clear path to commercialization. Luna: What's the biggest risk you see? Lucas: The biggest risk is that the carbon market isn't as robust as they hope. If they can't sell the carbon at a good price, the economics shift. Also, the hydrogen market is still developing. But if they can lock in offtake agreements with hydrogen buyers, that derisks the project significantly. Luna: And the technology risk — microwave generation at industrial scale is not trivial. Magnetrons have limited lifetimes. Lucas: Right. PyroH2 uses solid-state microwave generators, which are more efficient and have longer lifetimes than traditional magnetrons. But that's a newer technology. The ten-ton-per-day plant will test durability. If the generators hold up, that's a huge validation. Luna: So we're watching this one closely. Lucas: Absolutely. I'll be following the commissioning of that demo plant. If they hit their targets, this could be one of those rare technologies that actually changes the waste landscape. I'll keep you posted. Luna: Please do. That's it for this episode of The Manufacturing Podcast. We'll be back next week with another story from the factory floor.