Preferential synthesis of ethanol from syngas via dimethyl oxalate hydrogenation over an integrated catalyst

Abstract

A novel, simple and efficient integrated catalyst exhibits an extremely high selectivity of 98% to ethanol in gas-phase hydrogenation of dimethyl oxalate.

Tunable Synthesis of Ethanol or Methyl Acetate via Dimethyl Oxalate Hydrogenation on Confined Iron Catalysts

“…In Fe-based catalysis, the hydrogenation from MA to ethanol is far more difficult than the first two steps of DMO hydrogenation, which needs a huge amount of hydrogen. 35 Therefore, an appropriately high H 2 /DMO molar ratio is to the benefit of deep hydrogenation to produce ethanol. However, a low H 2 /DMO molar ratio makes a large number of DMO conversion remain in MA phase, preventing a difficult further hydrogenation.…”

“…After they were reduced in H 2 at 400 °C and then exposed in the reaction atmosphere, the Fe 2+ and Fe 3+ from precursor ferrous oxalate in fresh catalyst are reduced and then in situ carbonized to Fe 5 C 2 , which is known to be the main active center by methanol or other carbon-containing compounds. 29,30,34,65 Additionally, the spm-Fe 3+ is mainly from Fe 3 O 4 which is a stable oxide formed during the reaction (Figure 5e,f,h,i).…”

“…34 An ingenious integrated Fe 5 C 2 and CuZnO-SiO 2 catalyst can further promote ethanol production by enhancing hydrogenation of unconverted MA on Cu sites. 35 To date, the tunable syntheses of ethanol or methyl acetate with a high selectivity in one catalyst remain great challenges owing to the difficult regulation of catalyst structure and contradictory reaction atmospheres. It requires a very high H 2 / DMO molar ratio (>180) 33−35 molar ratio generally tends to faciliate the preliminary hydrogenation of DMO, in which the main product is MG, probably accelerating cause the deactivation of catalysts.…”

Effect of cu content on Ce‐doping CuO/ZrO2 catalysts for low‐temperature hydrogenation of dimethyl oxalate to ethanol

“…The catalyst plays an important role especially in the DMO hydrogenation process, which can improve the conversion efficiency and reduce the activation energy of the reaction 5,6 . The use of supported catalyst is a well‐appreciated approach in the fields of hydrogenation process, whose activity mainly depends on the carrier used, 7 the properties of active metals, the method for the catalyst preparation, 8 and the preparation parameters such as calcination temperature 9,10 .…”

Progress through synergistic effects of heterojunction in nanocatalysts ‐ Review

“…Such nanocomposites can serve as integrated catalysts that possess interfacial junctions functioned as building bridges for either charge transfer or synergistic interaction to result in enhancing catalytic activity and selectivity. [16] The study on the catalytic performance has attracted worldwide attention by simply using single-component catalysts to accomplish chemical reactions. As an inherent limitation, single nanocomposites generally exhibit a poor catalytic efficiency.…”