<prompt> Translate the following text to EnglishWauzaji ambao wametoa kichocheo kwa matumizi ya makaa ya mawe katika siku za nyuma lakini kwa sasa kuzingatia kabisa juu ya matumizi ya gesi na mafuta -fired hawakujumuishwa.  <response>: Suppliers that have offered catalyst for coal applications in the past but currently focus strictly on gas and oil -fired applications were not included. 