The various embodiments herein provide for an intelligent method and system with carbon nano tube filters for adsorbing and removing toxic and hydrocarbons in exhaust and in industrial soot. The carbon nano tube filter comprises two nano catalysts and monolith cylinders. The carbon nano tubes are single or multi walled. The nano catalysts are optimized carbon nano tubes coated with adhesive material, cobalt oxide and nano oxides of specific metals. The monolith cylinders are covered by palladium and rhodium oxides. The process of making the carbon nano tube based filter involves synthesis of highly purified carbon nano tube, surface modification of carbon nano tube with catalyst nano particle and optimization and deposition of nano metal oxides on the surface of nano catalyst. Further the nano-materials are coated on the internal surface of monoliths and the entire structure in subjected to sintering in a vacuum furnace.