镁对Pt-Re/γ-Al2O3重整催化剂性能的影响

考察了引入Mg对Pt-Re/γ-Al2O3重整催化剂的影响。结果表明，Mg的不同引入方式对Pt-Re/γ-Al2O3重整催化剂的影响也不同。催化剂浸渍时采用Mg(NO3)2.6H2O的引入方式，随着Mg含量的增加，催化剂的持氯能力降低，硫化后催化剂的硫含量增加，催化剂的选择性有明显改善，但催化剂的活性降低；而采用MgCl2.6H2O浸渍方式，催化剂预处理后的持氯能力提高，硫化后催化剂硫含量基本保持不变，催化剂的选择性也有明显改善。控制合适的Mg含量，催化剂的积炭速率降低，催化剂的活性稳定性提高。引入镁对Pt-Re/γ-Al2O3重整催化剂的比表面积、孔体积和孔径分布以及Pt金属分散度没有明显改变。

EFFECT OF MAGNESIUM ON THE PERFORMANCE OF Pt-Re/γ-Al2O3 REFORMING CATALYST

Effects of magnesium on the performance of Pt-Re/γ-Al2O3 reforming catalysts have been investigated in this paper.The test results showed that different way of incorporation of magnesium has different influence on the performance of Pt-Re/γ-Al2O3 reforming catalysts. With the content of magnesium increasing by the way of impregnation of Mg(NO3)2.6H2O,catalyst's chlorine-retention ability reduces and its content of sulfur increases.The selectivity of catalyst is obvious improved, but its activity is decreased. The chlorine-retention ability of catalysts by the way of impregnation of MgCl2.6H2O increases,and the content of sulfur keeps the normal extent. Controling appropriate content of magnesium, carbon deposit velocity of the catalyst decreases and its activity stability increases. No obvious changes were observed of specific surface , pore volume, pore-size distribution and Pt grain size of the catalysts.