Pt-Pd/SiO2-Al2O3催化剂芳烃加氢饱和性能研究 |
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引用本文: | 张孔远 杨光 何金康 纵秋云 马亮. Pt-Pd/SiO2-Al2O3催化剂芳烃加氢饱和性能研究[J]. 石油炼制与化工, 2022, 53(12): 31-38 |
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作者姓名: | 张孔远 杨光 何金康 纵秋云 马亮 |
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作者单位: | 1. 中国石油大学(华东)重质油国家重点实验室;2. 青岛联信催化材料有限公司; |
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摘 要: | 以SiO2质量分数40%的无定形硅铝和氢氧化铝干胶为主要原料,制备不同SiO2含量的SiO2-Al2O3载体,以氯铂酸和氯化钯为Pt和Pd的前躯物配制浸渍液,并用等体积浸渍法制备Pt-Pd/SiO2-Al2O3催化剂。采用N2吸附-脱附、X射线衍射、程序升温脱附、金相显微镜、透射电子显微镜等手段对所制备催化剂进行表征,在10 mL固定床加氢装置上,以2%(w)四氢萘+10%(w)十氢萘+88%(w)异辛烷混合物为原料对催化剂进行芳烃加氢活性评价。结果表明:在SiO2质量分数为20%~40%范围内,随着SiO2含量的增加,催化剂的比表面积增大,晶相组成不变,中强酸酸量增加,L酸酸量减少,B酸酸量增加;Pt-Pd在SiO2-Al2O3载体上的分散由蛋壳型转变为均匀型,分散度增加;其催化四氢萘加氢的活性提高。随着浸渍液中盐酸浓度增加,催化剂上活性组分的分散度先增大后减小,盐酸浓度为0.1 mol/L时Pt-Pd/SiO2-Al2O3活性组分的分散度最好,催化剂的四氢萘加氢活性最高。
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关 键 词: | Pt-Pd催化剂 无定形硅铝 芳烃加氢 SiO2含量 浸渍液 |
收稿时间: | 2022-05-10 |
修稿时间: | 2022-08-16 |
STUDY ON AROMATICS HYDROGENATION SATURATION PERFORMANCE OF Pt-Pd/SiO2-Al2O3 CATALYST |
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Abstract: | TheSiO2-Al2O3 carriers with different SiO2 contents were prepared by using the amorphous aluminosilicate with mass fraction of 40% SiO2 and aluminum hydroxide gel as raw materials, and Pt-Pd/SiO2-Al2O3 catalysts were prepared by equal volume impregnation method with chloroplatinic acid and palladium chloride as precursors of Pt and Pd. The prepared catalyst was characterized by N2 adsorption-desorption, XRD, TPD, metallographic microscope, TEM and other methods. On a 10 mL fixed bed hydrogenation unit, the hydrogenation activity of the catalyst was evaluated with the model compound containing 2% tetralin + 10% decalin + 88% isooctane as the raw material. The results showed that the specific surface of the catalysts increased with the increase of SiO2 content in the range of 20%-40%, the crystal phase composition remained unchanged, the amount of B acid and medium acid increased but L acid declined.The dispersion of Pt-Pd on SiO2-Al2O3 carriers was gradually changed from eggshell type to homogeneous type,the degree of dispersion increased, and the hydrogenation activity of tetralin increased. With the increase of the concentration of hydrochloric acid in the impregnation solution, the dispersion of the catalyst first increased and then decreased. The Pt-Pd/SiO2-Al2O3active component had the best dispersion at the concentration of 0.1 mol/L hydrochloric acid, and the tetralin hydrogenation activity of the catalyst was the highest. |
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Keywords: | Pt-Pd catalyst amorphous silica-alumina aromatic hydrogenation SiO2 content impregnating solution |
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