Phosphotungstic acid immobilized on amino functionalized spherical millimeter-sized mesoporous γ-Al2O3 bead and its superior performance in oxidative desulfurization of dibenzothiophene
Phosphotungstic acid immobilized on amino functionalized spherical millimeter-sized mesoporous γ-Al2O3 bead and its superior performance in oxidative desulfurization of dibenzothiophene
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氨基功能化球形毫米级介孔γ-Al2O3珠固载磷钨酸及其在二苯并噻吩氧化脱硫中的优异性能
DOI：
10.1016/j.fuel.2016.05.063
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发表时间：
2016-10-01
期刊：
影响因子：
7.4
通讯作者：
Zuhra, Zareen
中科院分区：
文献类型：
--
作者：
Qin, Libo;Zheng, Yang;Zuhra, Zareen
将磷钨酸H3 PW 12 O 40（HPW）固载于氨基功能化的球形毫米级介孔γ-Al 2 O3微球（NH 2-Al 2 O3）表面，成功制备了HPW/NH 2-Al 2 O3复合材料。采用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、比表面积（BET）和机械强度等测试手段对复合材料进行了表征。实验结果表明，在HPW与Al 2 O3表面之间引入-NH 2基团，不仅为催化中心HPW在载体表面的高分散提供了强结合位点，而且防止了HPW的结构分解。结果表明，所制备的HPW/NH 2-Al 2 O3对二苯并噻吩（DBT）和正辛烷组成的模型油具有良好的催化氧化脱硫性能。在最佳工艺条件下，60 mg HPW/NH 2-Al 2 O3催化剂可使20 mL正辛烷中的硫含量在2 h内降至2.8 ppmws。值得注意的是，催化剂可以通过简单的倾析方法方便地回收。循环使用10次后，氧化脱硫效率仅从99.2%略微下降到98.6%。结果表明，合成的HPW/NH_2-Al_2O_3小球具有很好的氧化脱硫催化性能。(C)2016爱思唯尔有限公司版权所有
The composite material HPW/NH2-Al2O3 was successfully prepared by immobilization of phosphotungstic acid H3PW12O40 (HPW) on the surface of amino functionalized spherical millimeter-sized mesoporous gamma-Al2O3 beads (NH2-Al2O3), that featured high specific surface area, remarkable enhanced mechanical strength, chemical stability and low cost. This composite material was characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), Brunner-Emmet-Teller (BET) and mechanical strength measurements. The experimental results showed that introduction of -NH2 group in between HPW and Al2O3 surface not only provide strong binding sites for catalytic centers HPW to get high dispersion on the carrier surface but also prevent HPW from structural decomposition. As a consequence, the prepared HPW/NH2-Al2O3 exhibited excellent catalytic performance in the oxidative desulfurization of model oil composed of dibenzothiophene (DBT) and n-octane. The 350 ppmws of sulfur content in 20 mL of n-octane can be dropped down to 2.8 ppmws in 2 h using 60 mg of HPW/NH2-Al2O3 catalyst under the optimal conditions. Remarkably, the catalyst can be conveniently recycled by simple decantation method. After 10 times recycling, the oxidation desulfurization efficiency just dropped down slightly from 99.2% to 98.6%. The results indicate that synthesized HPW/NH2-Al2O3 beads have great potential as a catalyst in oxidative desulfurization for special practical applications. (C) 2016 Elsevier Ltd. All rights reserved.