Hi, unless the flight is full, at check in you'll be able to request one Espaço+ seat showing your Emerald card. This benefit is only for the card holder, so if you are not alone, your companion won't get it for free. You are lucky: TAM has started to comply with this Oneworld benefit just yesterday!
The odd thing is the lacking of Sapphire benefit - at Oneworld website it's very clear that this benefit is up to emerald and sapphire. But I think TAM doesn't think the same...