孔结构与酸性质对多孔氧化铝材料催化性能的影响研究

选用两种自制氧化铝材料和三种工业氧化铝材料，采用XRD，XRF，BET，FT-IR，NH3-TPD等方法对水热老化前后的氧化铝材料进行详细的结构表征，并使用重油微反评价装置进行裂化性能评价。结果表明，五种氧化铝材料均具有拟薄水铝石结构，平均孔径介于5～16 nm均属于介孔范围，且仅含有L酸中心；制备方法的不同导致氧化铝材料的结晶程度、孔结构参数以及酸性质均有所不同，水热稳定性及裂化活性也存在较大差异；转化能力及产品分布同时与孔结构参数和酸性质（水热老化后）密切相关，在不同的孔径范围内两者的作用程度不同，对于平均孔径约10 nm的氧化铝材料，孔道性质对裂化性能的影响程度更大，平均孔径达13～25 nm时，总酸量对裂化性能的影响相对强于孔道性质的影响。

EFFECT OF PORE STRUCTURE AND ACIDIC PROPERTY ON CATALYTIC PROPERTIES OF POROUS ALUMINA MATERIALS

Two alumina materials prepared in lab and three industrial alumina materials before and after hydrothermal aging treatment were characterized by XRD、XRF、BET、FT-IR and NH3-TPD, and evaluated in a heavy oil micro reactor. The results indicated that the selected alumina materials possess pseudo-boehmite structure and average pore diameter of 5～16 nm belonging to mesopore. All the materials only have Lewis acid centres. The preparation method leads to an obvious difference in crystallinity, pore parameter, acidic property, hydrothermal stability and cracking activity. The cracking property and product distribution depend on both pore parameter and acidic property of the alumina material after hydrothermal aging treatment, and the effect degree of pore parameter and acidic property differs from each other in size of pore diameter. For the alumina material with pore diameter about 10 nm, the pore structure is the main influence factor. When the pore diameter increases to 13～25 nm, the influence of total acid content is relatively higher than the pore diameter.