氟对Pt-Sn/γ-Al2O3催化剂重整反应性能的影响

制备了不同氟含量的Pt-Sn/γ-Al2O3催化剂，考察了氟含量对重整催化剂物化性质及反应性能的影响。BET，Py-IR，NH3-TPD 等测试结果表明：氟的引入对催化剂比表面积、孔体积等物化性质没有显著影响；但可明显提高催化剂酸量，氟改性的γ-Al2O3载体表面既存在L酸中心又存在B酸中心，酸量随着氟含量的增加而增大；正庚烷和石脑油的重整反应性能测试表明，随着氟含量的增加，液化气收率明显增加， C5+液体收率与芳烃收率下降，催化剂积炭速率提高，氟质量分数大于1.0%时，催化剂表现出较高的液化气（C3+C4）选择性。

EFFECT OF FLUORINE ON Pt-Sn/Al2O3 CATALYST PERFORMANCE

The Pt-Sn/γ-Al2O3 catalyst with different content of Fluorine was prepared, and the influence of F on the performance of reforming catalysts was investigated. The results of BET, Py-IR, NH3-TPD tests showed that the introduction of F has no significant effect on specific surface area and pore volume of catalyst. But the catalyst acidity is significantly improved. Both Lewis and Bronsted acid sites exist on the F-modified γ-Al2O3 carrier surface, and the acid amount increases with increasing F content. The reaction performance of n-heptane and naphtha showed that LPG yield increases significantly with the increase of fluorine content, the yield of C5+ and aromatics decrease, while coking rate on the catalyst increases. When the fluorine content is greater than 1%, the catalysts exhibit a high selectivity of LPG（C3+C4）.