in boiler 12 or along outlet duct 15 in operation and use the method of the present invention comprises the steps of first injecting a raw carbonaceous starting material directly into the flue gas generated by the combustion process at any location upstream of particulate collection device 16 alternatively or in addition the raw carbonaceous starting material may also be injected into flue gas slip stream 30 and then added back to the flue gas at any location upstream of particulate collection device 16 alternatively or in addition the raw carbonaceous starting material may also be injected into a separate gas stream 41 generated by another source 40 such as a separate combustor or a separate process producing a gas stream or a waste heat stream this separate gas stream is then mixed with the flue gas at any location upstream of particulate collection device 16 the raw carbonaceous starting material may be any carbonaceous material such as coal wood petroleum coke biomass materials sewage sludge organic wastes or other carbonaceous material and can also be a liquid or gas derived from organic liquids such as residual or distillate oils or organic gases containing hydrocarbons such as methane ethane propane butane and ethylene or alcohols such as methanol and ethanol preferably organic gases contain molecules that have up to about eight carbon atoms upon activation if the raw carbonaceous material is a liquid or gas cracking pyrolysis partial oxidation or gasification occurs to form fine carbonaceous particles for example soot the particle size of the raw carbonaceous starting material or the fine carbonaceous particles formed from the liquid or gas should be fine enough to suspend the individual particles in the gas stream.