两种甲醇水蒸气重整制氢催化剂的研究

The CuZnAlO catalyst prepared by co-precipitation and the catalyst derived from hydrotalcite-like layered double hydroxides(LDHs) precursors were studied in this paper. For Cu based CuZnAlO, the methanol conversion，H2 yield and selectivity were improved greatly when ZrO2 was added as the promoter. COPZr2 with 10% of Zr shows the best catalytic performance. Its optimized reaction conditions in SRM(steam reforming of methanol) were confirmed as follows: 250 ℃, 0.1 MPa, H2O/MeOH=1.3, WHSV=3.56 h－1, no carrier gas. During the 150 h stability test of COPZr2, the methanol conversion and H2 yield were kept at 88% and 83% respectively; and the H2 and CO content in outlet were >63% and 0.20%～0.31%, which indicates that the catalysts possess good stability. The catalysts derived from LDHs precursors show high H2 and CO2 selectivity.The methanol conversion and H2 yield are improved when ZrO2 is added. LDHZr2 with 30% of Zr shows the best catalytic performance. During its 70 h stability test, the activity decreases at first and then methanol conversion and H2 yield are kept at 73% and 66% respectively; and the H2 and CO content in outlet are >55% and 0.07%～0.08% respectively, which indicates that such catalysts have good CO2 selectivity and low outlet CO content. The Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD) results of the catalysts derived from LDHs precursors show that ZrO2-promoter can improve the dispersion of CuO crystals.