A Comparison of FeS_ FeS+S and__ solid superacid catalytic.pdf

Fuel 86 (2007) 835–842A Comparison of FeS, FeS+S and solid superacid catalytic properties for coal hydro-liquefaction Zhicai Wang a,b,*, Hengfu Shui b, Dexiang Zhang a, Jinsheng Gao a a College of Resource and Environment Engineering, East China University of Science and Technology, 200273 Shanghai, China b School of Chemistry and Chemical Engineering, Anhui University of Technology, 243002 Ma’anshan, China Received 27 January 2006; received in revised form 27 July 2006; accepted 25 September 2006 Available online 25 October 2006Abstract Catalyst plays an important role in direct coal liquefaction. This paper focuses on the catalytic behavior of a novel SO24 =ZrO2 super- acid catalyst in coal hydro-liquefaction. A series of hydro-liquefaction experiments were conducted under mild conditions – 400 C, 30 min and H2 initial pressure 4 MPa in a batch autoclave with a volume of 100 ml. The catalytic property of SO 2 4 =ZrO2 was compared with FeS and FeS+S by Shenhua coal. The liquefaction products catalyzed by different catalysts were analyzed by FTIR spectrum, 1H NMR spectrum and element analysis. In addition, the SO24 =ZrO2 solid superacid was characterized. The results indicated that the SO24 =ZrO2 solid superacid shows outstanding catalytic property for direct liquefaction of coal and gives the highest coal conversion and gas + oil yield compared to other two catalysts. The THF conversion and the extraction yield of CS2/NMP mixed solvent of lique- fied coal catalyzed with SO24 =ZrO2 are 76.3%,daf and 81.2%,daf respectively, and the yield of gas + oil is 62.5%,daf under the condition used in this study. The pyrolysis of coal macromolecular clusters can be promoted by catalysts such as FeS, FeS+S and SO24 =ZrO2. There may be only the pyrolysis of volatile matter and the relaxation of the structure of coal macromolecular clusters in non-catalytic liquefaction at 400 C. Added sulfur in FeS can improve the catalytic activity of hydrogenation. SO24 =ZrO2 is a not