If the reaction producing nickel is as follows: ni(co)4(g) + heat ni(s) + 4co(g) - heat the reaction from left to right is and, therefore, the addition of heat will the production of nickel.

If the reaction producing nickel is as follows: Ni(CO)4(g) + heat Ni(s) + 4CO(g) - Heat The reaction from left to right is endothermic and, therefore, the addition of heat will accelerate the production of nickel.

According to Le Chatelier's Principle the position of equilibrium moves to counteract the change. Because heat is reactant, adding more heat shift reaction to he right, so system consume that heat.

Well to my expert knowledge and my exquisite calculations i think the the negative ion # 412 is the key to sucess