Metallic monoliths of AISI 304 stainless steel, aluminum, FeCrAlloy® and brass, coated by Mo and W oxides for thiophene hydrodesulfurization
Metallic monoliths of AISI 304 stainless steel, aluminum, FeCrAlloy® and brass, coated by Mo and W oxides for thiophene hydrodesulfurization
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DOI：
10.1016/j.fuel.2013.01.044
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发表时间：
2013-08-01
期刊：
影响因子：
7.4
通讯作者：
Brito, Joaquin L.
中科院分区：
文献类型：
--
作者：
Diaz, Yraida;Sevilla, Adriana;Brito, Joaquin L.
AISI 304 不锈钢 (SS)、铝 (Al)、FeCrAlloy (R) (FA) 和黄铜 (B) 金属板用于制造金属整体件，为基于 Mo 和 W 氧化物的催化剂提供载体。这些材料通过 XRD、N-2 物理吸附 (BET)、粘附测试和 SEM-EDS 进行了表征。使用 400 摄氏度和 P = 1 atm 下的噻吩加氢脱硫 (HDS) 作为模型反应，研究了未涂层和涂层金属整体的催化性能。为了产生适合锚定催化浆料的高粗糙度界面，在合成空气流下对 SS、FA 和 B 板进行热处理，而对 Al 则采用阳极氧化工艺（化学处理）。 XRD图谱显示热处理或阳极氧化处理后表面形成Cr3O8、Al2O3型勃姆石、α-Al2O3和θ-Al2O3氧化相以及ZnO型纤锌矿，以及涂层时形成MoO3或WO3相。用 Mo 或 W 处理和涂覆的 SS、Al、FA 和 B 片材的 SEM 可以观察到 SS、FA 和 B 的晶须形成的均匀粗糙表面以及 Al 表面上的孔。 EDS 分析证明了结构中掺入了 Mo 和 W，检测到这些金属的含量为 7-10 wt%。 BET 结构分析显示其值在 5 至 16 m(2)/g 之间，而附着力测试报告质量损失低于 5%，其中金属整料表明 Mo 浆料比 W 浆料具有更大的抓力。最后，催化系统的评估表明 Mo-FeCrAlloy (R) 和 Mo-黄铜整料在 HDS 中最活跃，其活性高于 0.27 mmol-C4H4S/g x min，表明涂有 Mo 浆料的整体材料比涂有 W 浆料的整体材料表现出更高的催化活性。 (C) 2013 Elsevier Ltd. 版权所有。
Metal sheets of AISI 304 stainless steel (SS), aluminum (Al), FeCrAlloy (R) (FA) and brass (B) were employed in the manufacture of metallic monoliths to provide a support for catalysts based on Mo and W oxides. These materials were characterized by XRD, N-2 physisorption (BET), adherence test and SEM-EDS. The catalytic performance of the uncoated and coated metallic monoliths was studied using thiophene hydro-desulfuration (HDS) at 400 degrees C and P = 1 atm as model reaction. With the purpose of generating a high rugosity interface appropriate for anchoring the catalytic slurry, thermal treatments were applied under a stream of synthetic air to the sheet of SS, FA and B, while an anodizing process (chemical treatment) was used for Al. The XRD patterns showed oxidic phases of Cr3O8, Al2O3 type boehmite, alpha-Al2O3 and theta-Al2O3 and ZnO type wurtzite formed on the surfaces after thermal or anodizing treatments, as well as MoO3 or WO3 phases when coated. SEM of the SS, Al, FA and B sheets treated and coated with Mo or W allowed visualization of the homogeneously rough surface formed by whiskers for SS, FA and B, and the pores on the surface of Al. Incorporation of Mo and W in the structure is evidenced from the EDS analyses, detecting contents of 7-10 wt% of these metals. The textural analysis by BET showed values between 5 and 16 m(2)/g, while the adherence test reported mass loss below 5% where metal monoliths showed that the slurry of Mo has more grip than the slurry of W. Finally, the evaluations of the catalytic systems showed that the monoliths of Mo-FeCrAlloy (R) and Mo-brass were the most active in HDS with activities above 0.27 mmol-C4H4S/g x min, showing that the monoliths coated with slurry of Mo presented higher catalytic activity than those coated with slurry of W. (C) 2013 Elsevier Ltd. All rights reserved.