NiMo and NiW Nanostructured Catalysts of Thiophene Oxidation, Obtained via Laser Electrodispersion

Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

“…In contrast to monometallic samples, dark particles 4-7 nm in size were observed in the TEM images of bimetallic NiMoand NiW/Al 2 O 3 samples. [15] Stronger contrast of these particles compared to alumina evidences that they may contain the fraction of non-oxidized metals (Ni, Mo, and W). According to TEM-and STEM-EDS data ( Figure S7 and S8, SM), both metals in bimetallic samples are uniformly distributed on the support, regardless of its type (C-grid or alumina surface).…”

“…The possibility of LED deposition of uniform bimetallic oxide coatings comprising Ni and Mo or W on alumina support when using a pressed mixture of their powders as a target has been recently demonstrated. [15] This work compares the structure and properties of such bimetallic LED catalysts with their monometallic counterparts on the example of thiophene oxidation with hydrogen peroxide. The main product of this reaction on both monometallic (Mo and W) and bimetallic catalysts is sulfuric acid.…”

“…Ni, Mo, and W catalysts were tested as described in. [15] The model mixture (10 ml of 1 wt.% thiophene solution in isooctane, 0.1 g of the catalyst and 0.4 ml of 50 % H 2 O 2 ) was placed in a thermostated reactor equipped with a stirrer. The process was carried out at 60°C and samples of the organic phase were periodically collected for GC-FID analysis on a Kristall 2000M chromatograph (Chromatec, Russia) with a capillary column (Zebron ZB-1, 30 m × 0.32 mm i.d.…”

“…However bimetallic LED catalysts were synthesized only recently. [14,15] The PdÀ Ni active component is one of the most interesting for catalytic systems. Recently the possibility to produce a bimetallic coating on the alumina surface using the NiPd alloy target for LED deposition has been shown.…”

“…NiMo and NiW nanoparticles supported by LED on γ-Al 2 O 3 showed high efficiency in oxidation of sulfur-containing substrates with hydrogen peroxide. [15] This process is of practical importance for the development of new oxidative oil desulfurization methods as an alternative to the traditional hydrotreating. Oxidative catalysts are typically pure and complex oxides or metallates of Mo, W or other V-VI group metals.…”