Partial oxidation of CH₄ to HCHO over a MoO₃‐SiO₂ catalyst: A kinetic study

Abstract

There is considerable economic incentive to convert methane into formaldehyde, which is used in the manufacture of insulating materials and adhesives. This paper discusses the kinetics of a one-step oxidation of methane with molecular oxygen over a Moo,-SiO, catalyst. The space velocity was varied between 2,500 and 10,000 h-' (at NTP) over a range of temperatures from 848 to 923 K.Selectivities to formaldehyde between 30 and 89% were observed in the 0-5% methane conversion range, the other principal products being CO, COP, and H,O. Kinetic analysis indicates that methane is directly oxidized to CO, and HCHO, with HCHO being further oxidized to CO. The reactions were all found to be zero order in oxygen concentration, with methane and formaldehyde oxidation following overall first-order rate laws. Kinetic rate constants have been determined and there is good agreement between model predictions and experimental data.

Methane conversion using a high‐frequency pulsed plasma: Discharge features

“…Direct methane conversion to more valuable chemicals and liquid fuels has attracted much more attention from the beginning of 1980s (Edwards and Foster, 1986;Spencer and Pereira, 1987;Renesme et al, 1992;Fierro, 1993;Fox, 1993;Krylov, 1993;Parkyns et al, 1993;Arutyunov et al, 1996). Catalytic selective oxidation of methane to methanol was expected to be able to obviously save investment and operation cost if methane conversion and methanol selectivity can reach high levels.…”

Partial oxidation of methane to synthesis gas by a microwave plasma torch

“…[1][2][3] To convert CH 4 into syngas by partial oxidation (CH 4 ϩ 0.5O 2 3 CO ϩ 2H 2 , ⌬H 298 0 ϭ Ϫ59.7 kJ/mol), steam reforming (CH 4 ϩ H 2 O 3 CO ϩ 3H 2 , ⌬H 298 0 ϭ 229.7 kJ/mol), and CO 2 reforming (CH 4 ϩ CO 2 3 2CO ϩ 2H 2 , ⌬H 298 0 ϭ 247 kJ/mol) reactions are the main route for subsequent methanol production, ammonia synthesis, or the Fischer-Tropsch synthesis. 4 It has been estimated that approximately 60 -70% of the cost of the overall process is associated with syngas preparation in the process of methane conversion.…”

Growth of nanocrystalline MoO3 on Au(111) studied by in situ scanning tunneling microscopy

“…[6][7][8][9] Stoichiometric MoO 3 has a band gap of 2.8 eV, however, states are introduced in the gap when point defects due to loss of oxygen are created. In particular, molybdenum trioxide is known to promote the partial oxidation of methane to formaldehyde.…”