Catalytic cracking of coal pyrolysis product for oil and gas upgrading over char-based catalysts

Catalytic cracking upgrading of coal pyrolysis oil and gas products was conducted in a dual-stage reactor using char and Co-impregnated char (Co-char) as the catalyst. The tested coal was Fugu coal, and the upper stage of the dual-stage reactor was used for pyrolysis. During catalytic cracking of coal pyrolysis products, tar yield decreased, and gas yield and also light oil fraction content of (boiling points<360°C) the tar increased, while the yield of light tar remained constant or increased slightly. For the pyrolysis with secondary cracking at 600°C over a char layer of 20% the tested coal, its gas yield and light tar content increased respectively by 31.2% (vol) and 25% (mass) in comparison with the direct pyrolysis of coal at 600°C, whereas light tar yield varied little. When Co-char was used as the catalyst, cracking at 500°C over the catalyst of 5% coal mass increased light oil yield and light oil content in the tar by 8.8% (mass), and 28.8% (mass), respectively. The corresponding increase in gas yield was 21.5% (vol). Catalytic secondary cracking in coal pyrolysis worked mainly to convert heavy oil components into light oil and pyrolysis gas. © All Rights Reserved.