Iron has a strong catalytic effect for oxydation reactions, but a weaker for chlorination and Ullmann-type reactions. Many other metals have some strong effect for one reaction but no or much weaker for the others. None of them produce as much dioxins as copper and iron do. One of the alternatives for direct incineration is thermolyses, using no air in the first step. The waste, mixed with some lime to trap acid gases, is heated to app.
All organic material is carbonised.
Because there is no oxygen in the atmosphere, no dioxins are formed. The gases are incinerated to carbonise the waste. My fellow countryman, Emmanuel De Broux, is a supporter of that process as an alternative for incineration. See his web site for thermolyses vs. incineration . You are at level three of the Chlorophiles pages.