Co-Pyrolysis Explained: The Science Behind Zero-Emission Waste Processing

Most people have never heard of co-pyrolysis. That’s about to change. Here’s how TYRO’s patented process works — and why it solves what decades of single-stream pyrolysis couldn’t.

Every year, 1.5 billion tyres reach the end of their life. Billions more tonnes of plastic join them. And for decades, the world has been stuck with the same inadequate answers: bury it, burn it, or ship it somewhere else. 

Every year, 1.5 billion tyres reach the end of their life. Billions more tonnes of plastic join them. And for decades, the world has been stuck with the same inadequate answers: bury it, burn it, or ship it somewhere else. 

The recycling industry promised a solution. It didn’t deliver. Traditional pyrolysis technology promised a solution. It also didn’t deliver — not at scale, not cleanly, not commercially. 

So what went wrong? And more importantly — what does actually work? 

The answer is co-pyrolysis. And if you haven’t heard of it yet, you will. 

First, Let’s Talk About What Pyrolysis Actually Is 

Pyrolysis is the thermal decomposition of materials in the absence of oxygen. In plain terms: you apply heat to a material in a sealed, oxygen-free environment, and it breaks down into simpler chemical compounds — without catching fire. 

It’s not a new concept. Scientists have understood the principles of pyrolysis for over a century. The challenge has never been the science. It’s been the application. 

Traditional pyrolysis systems process a single waste stream — either tyres or plastics — and the results have been consistently disappointing. The fuel oils produced tend to be high in sulphur and acidic, making them difficult to sell into premium markets. The carbon black — or char — produced is low quality and low value. And the economics rarely stack up against the capital cost of building and running a plant. 

That’s why, despite decades of investment and interest, single-stream pyrolysis has never scaled. The technology works in theory. In practice, it keeps falling short. 

So What Is Co-Pyrolysis — And Why Is It Different? 

Co-pyrolysis is exactly what it sounds like: processing two different materials together in a single pyrolysis system — in TYRO’s case, waste tyres and waste plastics simultaneously. 

But this isn’t just about convenience or efficiency. The magic is in the chemistry. 

When tyres and plastics are broken down together, something unexpected happens. The two feedstocks interact at a molecular level, creating a synergistic chemical reaction that produces outputs of significantly higher quality than either material would produce alone. 

Here’s the key distinction: 

Tyres are rich in carbon. Plastics are rich in hydrogen. When processed together in the right ratio, the hydrogen from the plastic interacts with the sulphur compounds in the tyre-derived material, effectively neutralising them. The result is fuel oil that is ultra-low in sulphur and free of the acidic compounds that plague single-stream tyre pyrolysis. The carbon black produced is near-zero sulphur — high-grade, high-value, and commercially competitive. 

This is the breakthrough that TYRO, developed in partnership with Monash University, has spent years perfecting and patenting. It isn’t a theory. It’s a working, validated, patented process — and it solves the exact problems that have prevented pyrolysis from scaling for decades. 

Inside the TYRO Reactor: How It Actually Works 

Here’s a step-by-step look at what happens inside a TYRO Co-Pyrolysis plant: 

Step 1: Feedstock Preparation Waste tyres and waste plastics are collected, sorted, and prepared for processing. The ratio of tyres to plastics is carefully calibrated to optimise the chemical reaction and output quality. 

Step 2: The Reactor The feedstock enters a sealed, oxygen-controlled reactor. There is no oxygen inside — which means there is no combustion. No fire. No smoke. The material is subjected to precisely controlled heat, which causes it to thermally decompose. 

Step 3: The Co-Pyrolysis Reaction As the material breaks down, the unique chemistry of co-pyrolysis takes effect. The hydrogen-rich plastic compounds interact with the sulphur-heavy tyre compounds, producing a chemical environment that yields cleaner, higher-quality outputs than either material would produce in isolation. 

Step 4: Output Separation The decomposed material separates into three distinct output streams: 

• Fuel oil vapours — which are condensed and collected as Very Low Sulphur Fuel Oil (VLSFO). 

• Carbon black (char) — a solid residue that is collected, processed, and sold as near-zero sulphur premium carbon black. 

• Non-condensable gases — which are recycled back into the system to fuel the reactor itself, creating a self-powering closed loop. 

Step 5: Zero Residue There is no ash. No toxic by-products. No waste stream requiring disposal. Every input is converted into a usable output. The process is genuinely closed-loop. 

The Outputs: What Co-Pyrolysis Actually Produces 

Let’s be specific about what TYRO’s process produces — because this is where co-pyrolysis moves from interesting science to commercial reality. 

Very Low Sulphur Fuel Oil (VLSFO) VLSFO is one of the most in-demand fuels in global shipping following the introduction of IMO 2020 regulations, which mandated a dramatic reduction in the sulphur content of marine fuels. Demand is high. Supply from conventional sources is constrained. TYRO’s co-pyrolysis process produces VLSFO that meets these stringent standards — from waste, with zero emissions. 

Premium Carbon Black Carbon black is an industrial material used in tyre manufacturing, steelmaking, rubber production, and advanced materials. Globally, it’s a multi-billion dollar market almost entirely supplied by the petrochemical industry. TYRO’s near-zero sulphur carbon black offers a circular, lower-emission alternative — without compromising on quality. For tyre manufacturers in particular, it creates a genuine closed-loop supply chain: tyres in, carbon black out, back into new tyres. 

Hydrogen The non-condensable gases produced by co-pyrolysis contain hydrogen, which can be captured and processed for use in clean energy applications. As the global hydrogen economy develops, this represents a growing opportunity for TYRO plants to contribute to the clean energy transition — from waste feedstock. 

Why This Solves What Single-Stream Pyrolysis Couldn’t 

The failures of traditional pyrolysis aren’t hard to diagnose. High-sulphur, acidic fuel oils that struggle to find buyers. Low-grade carbon black with limited commercial value. Plants that can’t power themselves efficiently. Economics that don’t justify the capital investment. 

Co-pyrolysis addresses every one of these failure points: 

The sulphur problem is solved by the chemistry of processing tyres and plastics together. The output quality problem is solved by the same mechanism. The energy problem is solved by recycling the process gases back into the reactor. The economics are transformed by producing premium commodities — VLSFO and high-grade carbon black — that command real market prices. 

This is why TYRO’s partnership with Monash University was so significant. The research didn’t just prove that co-pyrolysis worked. It proved why it worked, optimised the feedstock ratios and reactor conditions to maximise output quality, and produced the intellectual property that underpins the patent. It turned a promising scientific concept into a commercially viable, replicable, scalable process. 

The Bigger Picture: Why Co-Pyrolysis Matters Right Now 

Australia banned the export of waste tyres in 2021. The export of mixed plastics followed. Overnight, the pressure to develop domestic processing capacity became urgent. The waste was no longer someone else’s problem — it was ours to solve. 

At the same time, global shipping is under mounting regulatory pressure to decarbonise. Demand for low-sulphur fuels is structurally growing. The carbon black market is looking for lower-emission alternatives. And the hydrogen economy is moving from aspiration to infrastructure. 

Co-pyrolysis sits at the intersection of all of these forces. It solves a waste crisis and produces the commodities the world’s industries are actively seeking. That’s not a coincidence — it’s the reason TYRO was built. 

This Is Not a Pilot Project. This Is a Process. 

TYRO’s Co-Pyrolysis technology is not sitting in a university lab waiting for commercial interest. It is patented, validated, operating, and designed to scale — from regional pilot plants through to 300-tonne-per-day commercial facilities that can be licensed and deployed globally. 

The science is proven. The outputs are market-ready. The demand is real. 

The only thing that was missing was a system that actually worked. Now there is one. 

Want to understand how TYRO’s technology could work for your business, your region, or your waste challenge? 

RELATED ARTICLES 

• 1.5 Billion Tyres. Nowhere to Go. Here’s the Real Cost of the Global Tyre Waste Crisis. 

• Carbon Black: The Industrial Commodity Nobody Talks About (But Every Industry Needs) 

• Very Low Sulphur Fuel Oil: Why Shipping’s Clean Fuel Problem Is Bigger Than You Think