Defect-mediated selective hydrogenation of nitroarenes on nanostructured WS<sub>2</sub>
作者:Yifan Sun、Albert J. Darling、Yawei Li、Kazunori Fujisawa、Cameron F. Holder、He Liu、Michael J. Janik、Mauricio Terrones、Raymond E. Schaak
DOI:10.1039/c9sc03337h
日期:——
nanostructures containing few-layer nanosheets are shown to catalyze the selective hydrogenation of a broad scope of substituted nitroarenes to their corresponding aniline derivatives in the presence of other reducible functional groups. Microscopic and computational studies reveal the important roles of sulfur vacancy-rich basal planes and tungsten-terminated edges, which are more abundant in nanostructured
WxMo(1−x)S2 compounds with both molybdenum and tungsten present in every disulfidelayer, i.e., as an intralayer solidsolution, can be obtained. Several synthesis routes have been used but all of them do not allow this solidsolution, which evidences the decisive role of the nature of the precursor, to be obtained. We never observed formation of a WxMo(1−x)S2solidsolution resulting from stacking
可以得到在每个二硫化物层中即作为层内固溶体同时存在钼和钨的W x Mo (1- x) S 2化合物。已经使用了几种合成路线,但是所有这些路线都不允许该固溶体,这证明获得了前体性质的决定性作用。我们从未观察到由于均阳离子层[WS 2 ]和[MoS 2 ]的堆叠(层间固溶体)而形成的W x Mo (1- x) S 2固溶体。
Solid-phase reaction synthesis of mesostructured tungsten disulfide material with a high specific surface area
作者:Gaojun An、Changbo Lu、Chunhua Xiong
DOI:10.1016/j.materresbull.2011.05.024
日期:2011.9
Highlights: yields} WSsub 2} material was synthesized through solid-phase reaction. yields} (NHsub 4})sub 2}WSsub 4} as precursor and n-octadecylamine as template. yields} WSsub 2} material has high specific surface area (145.9 msup2}/g). yields} The whole preparation process is simple, convenient, green and clean. -- Abstract: A mesostructured tungsten disulfide (WSsub 2}) material was prepared
Synthesis and Activity of a New Catalyst for Hydroprocessing: Tungsten Phosphide
作者:Paul Clark、Wei Li、S.Ted Oyama
DOI:10.1006/jcat.2001.3189
日期:2001.5
Characterization of intermediates quenched at different temperatures revealed a single crystalline reaction product whose specific CO uptake and BET surface areas passed through a maximum of 12 μmol g−1 and 15 m2 g−1, respectively, at 873 K. Heating rate variation measurements gave an apparent first-order activation energy of 148 kJ mol−1 for the reduction. Tungsten phosphide was catalytically active in the
磷化钨WP加氢处理催化剂的制备方法是:在0.0167 K s -1的升温速率下以程序升温方式还原X射线无定形磷酸钨,并在938 K的最终温度下浸泡2小时。在不同温度下淬灭后显示出单晶反应产物,其特定的CO吸收和BET表面积在873 K下分别通过最大12μmolg -1和15 m 2 g -1。 148 kJ mol -1的有序活化能为减少。磷化钨在模拟轻油的加氢脱氮和加氢脱硫反应中具有催化活性,该模拟轻油由20 wt%的四氢萘,76 wt%的十四烷,2000 wppm的N喹啉,3000 wppm的S二苯并噻吩和500 wppm的O作为苯并呋喃组成。在运行于3.1 MPa和643 K的上流式固定床反应器中进行测量,得出WP催化剂在稳态下的转化率为58%HDN和67%HDS。这些转化率优于在相同条件下测试的WC,W 2 N和WS 2的转化率。