Ti-modified hierarchical mordenite as highly active catalyst for oxidative desulfurization of dibenzothiophene
Ti-modified hierarchical mordenite as highly active catalyst for oxidative desulfurization of dibenzothiophene
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DOI：
10.1016/j.fuel.2016.01.070
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发表时间：
2016-06
期刊：
影响因子：
7.4
通讯作者：
Kunyue Leng;Yinyong Sun;Zhang Xing;Miao Yu;W. Xu
中科院分区：
文献类型：
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作者：
Kunyue Leng;Yinyong Sun;Zhang Xing;Miao Yu;W. Xu
以钛酸四丁酯（TBOT）为钛物种的前驱体，采用等容浸渍法制备了钛改性多级丝光沸石（Ti/MM）。由于TBOT的分子尺寸较大，引入的Ti物种位于丝光沸石中的微孔之外。因此，分级丝光沸石上的活性Ti物种是容易获得的。结果表明，Ti/MM具有丰富的介孔结构，是二苯并噻吩氧化脱硫的高活性ODS催化剂。以H2 O2为氧化剂，在333 K下反应120 min后，具有较大介孔体积的Ti改性分级丝光沸石（Ti/MM-0.5）的脱硫率达到98.6%，是普通丝光沸石的近4倍。相应地，模型燃料中的硫含量从1000 ppmw降低到14 ppmw。这些结果表明，钛改性的多级丝光沸石具有丰富的钛可及位，且成本低，是一种具有潜在应用前景的交通燃料ODS。
Ti-modified hierarchical mordenites (Ti/MM) were prepared using tetrabutyl orthotitanate (TBOT) as the precursor of Ti species by incipient wetness impregnation technique. The introduced Ti species were located outside the micropores in mordenite due to the large molecular size of TBOT. As a result, the active Ti species over hierarchical mordenites are easily accessible. The catalytic results indicated that Ti/MM were highly active ODS catalysts in the oxidative desulfurization (ODS) of dibenzothiophene due to rich mesoporosity. The sulfur removal content over a Ti-modified hierarchical mordenite (Ti/MM-0.5) with relatively large mesopore volume reached 98.6% after a reaction time of 120 min at 333 K by using H2O2as oxidant, which is nearly four times as that over Ti-modified conventional mordenite. Accordingly, the sulfur content in model fuel was reduced from 1000 ppmw to 14 ppmw. These results indicated that Ti-modified hierarchical mordenite with rich accessible Ti sites and low cost has potential applications for ODS of transportation fuels.