模板法制备Al2O3对CO2-CH4重整镍基催化剂稳定性影响研究

摘要

采用模板法制备氧化铝（T-Al2O3），并将其及其载Ni催化剂（TC-Al2O3）与市售氧化铝（B-Al2O3）及其载Ni催化剂(BC-Al2O3)进行分别对比。BET表明，T-Al2O3的平均孔径较小，仅为3.32nm，比表面积较高，达477m2·g-1；NH3-TPD表明，T-Al2O3载体表面存在弱酸位和强酸位，但酸性较B-Al2O3弱。 XRD表明，TC-Al2O3还原后的Ni晶粒尺寸较小，仅为5.6nm；H2-TPR表明，催化剂存在结晶态NiO和NiAl10O16尖晶石，且TC-Al2O3的NiO还原峰面积占总还原峰面积的86%，而BC-Al2O3仅为68%。 CH4/CO2重整试验结果表明，TC-Al2O3催化剂不仅具有较高的活性和H2收率，且稳定性好。%An alumina (T-Al2O3) was prepared by template method. T-Al2O3 and the Ni catalyst supported on it (TC-Al2O3) were compared with a commercial alumina (B-Al2O3) and the Ni catalyst supported on it (BC-Al2O3), respectively. BET results showed that T-Al2O3 had smaller average pore diameter of only 3.32nm and higher specific surface area of 477m2·g-1. NH3-TPD results showed that T-Al2O3 held mild and strong acid centers, which was weaker than that of B-Al2O3. XRD characterization results showed that TC-Al2O3 had better NiO dispersion, and its Ni grain size was only 5.6nm after reduction. H2-TPR characterization results indicated that the catalysts existed in the form of crystalline NiO and NiAl10O16 spinel, and the proportion of NiO reduction peak area of TC-Al2O3 in the total reduction peak area was 86%, and it was only 68%for TC-Al2O3. The evaluation experiments for CH4/CO2 reforming showed that TC-Al2O3 had better activity, H2 yield and stability than B-Al2O3.