Method for making carbonaceous heat source containing metal oxide with improvement

PURPOSE: To aim to lower ignition temperature to reduce CO upon combustion by treating a carbonaceous material with a sol containing a metal oxide precur sor. CONSTITUTION: For 15-60 minutes, 20-95 wt.% carbonaceous material having a surface area of 200-800 m 2 /g and an average particle diameter of not greater than 300 μ, 4-45 wt.% binder, water, and 0.05-10 wt.% combustion additive are mixed and extrusion-molded to obtain a bar having a length of about 30 cm, a diameter of 3.0-8.0 mm and a multi-apical, star-shaped air flow channel 22 in the longer direction. This bar is dried until the water content comes to 2-11% and then, calcined in an inert atmosphere at 260-1650°C to obtain an intermediate carbon bar 20. A sol containing a metal oxide is sprayed upon this bar 20 which is then heated at a rate of raising temperature of 0.5-10°C/min to 100-400°C to decompose the sol to the metal oxide and thus, a carbonaceous heat source having a metal oxide content of not more than 5 wt.% is obtained. COPYRIGHT: (C)1995,JPO