Vanadium oxide catalysts on structured microfiber supports for the selective oxidation of hydrogen sulfide

Abstract

Vanadium(V) oxide catalysts for the selective oxidation of hydrogen sulfide to sulfur on a nonpo rous glass fiber support with a surface layer of a porous secondary support (SiO 2 ) are studied. The catalysts are obtained by means of pulsed surface thermosynthesis. Such catalysts are shown to have high activity and acceptable selectivity in the industrially important region of temperatures below 200°C. A glass fiber catalyst containing vanadium oxide (10.3 wt % of vanadium) in particular ensures the complete conversion of H 2 S at a temperature of 175°C and a reaction mixture hourly space velocity (RMHSV) of 1 cm 3 /(g cat s) with a sulfur yield of 67%; this is at least 1.35 times higher than for the traditional iron oxide catalyst. Using a structured glass fiber woven support effectively minimizes diffusion resistance and greatly simplifies the scaleup of pro cesses based on such catalysts. Such catalysts can be used for the cleansing of tail gases from Claus units and in other processes based on the selective oxidation of H 2 S.

A review on sustainable iron oxide nanoparticles: syntheses and applications in organic catalysis and environmental remediation

“…The STS approach was well established for the generation of well-dispersed particles of active components which in turn showed high catalytic performance. 211,212 The TEM images of FeO x /GFC glassfiber catalysts (GFC) and traditionally synthesized FeO x /Al 2 O 3 catalyst are shown in Fig. 29; FeO x /GFC shows the localized silica through large porous particles, while iron oxide exists mainly as flattened Fe 2 O 3 islet with 1-2 nm long and a thickness of 0.5-1.0 nm.…”

Glass fiber supports modified by layers of silica and carbon nanofibers

“…Synthesis of GFC sample was performed by means of the surface thermal synthesis [3,[18][19]. This approach, in particular, utilizes the formation of the catalytically active component during the thermal treatment of the supported precursor, containing the organic salt of the active metal.…”

“…The use of SiO 2 as secondary support provides the rise of surface area up to 20-30 m 2 /g, giving the way to introduce higher amounts (up to 8-10 wt%) of active components into GFCs [3][4][5]. Though, such mass loading looks sufficient for many practical applications in catalysis, nevertheless, there is the need in the fibrous supports with higher surface area.…”

Investigation of the internal structure, fluid flow dynamics and mass transfer in the multilayered packing of the glass fiber catalyst in the pilot reactor for sulfur dioxide oxidation

“…На сегодняшний мо-мент наибольшее распространение в практических работах и исследованиях получили стекловолокнистые катализаторы (СВК) [3,4]. В качестве активных компонентов в СВК могут использоваться благородные металлы (Pt, Pd) [3][4][5][6][7][8][9][10][11][12][13] или оксиды переходных металлов [14][15][16][17][18], благодаря чему такие ката-лизаторы имеют весьма широкий спектр потенциальных применений на практике.…”