Well, again, I believe if Mr. Bordynuik starts with hydrocarbon-only plastic, he can probably use pyrolysis to break it into mostly valuable alkanes. Of course then anyone else can probably do it too--no secret catalyst needed. The problem there is the cost of the plastic feedstock.
If he uses mixed plastic for cheaper then he is going to have an issue with PET and all the other plastics that contain oxygen. Pyrolysis tends to create a lot of acids, ketones, etc..., which are hard to separate out. But if he uses mixed plastic, he might as well use landfill waste for the same rough percentages of carbon and oxygen. Again, if it wasn't a problem then everyone else would already be doing it.
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