Formaldehyde production from methanol and methyl mercaptan over titania and vanadia based catalysts

Selective oxidation of methanol to form dimethoxymethane and methyl formate over a monolayer V2O5/TiO2 catalyst

“…On the one hand, this is the excellent example of a relatively simple reaction of selective oxidation, which can produce a wide range of various compounds such as formaldehyde (F), dimethyl ether (DE), methyl formate (MF), dimethoxymethane (DMM), and formic acid (FA) with the selectivities that depend on a catalyst, reaction temperature, conversion, and partial pressures of reactants [1][2][3][4]. For instance, unsupported and silica-supported crystallites of vanadium pentoxide show high selectivity towards formaldehyde with the yield of 96-98 % in the temperature range of 300-400 °С [5][6][7][8]. In contrast, monolayer V 2 O 5 /TiO 2 catalysts demonstrate high activity and selectivity in the methanol oxidation to methyl formate and to dimethoxymethane at low temperatures (100-200 °С), whereas the formation of formaldehyde is greatly suppressed [9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Utilization of Volatile Organic Compounds as an Alternative for Destructive Abatement

“…The production of formaldehyde from methyl mercaptan is also possible in presence of other compounds (i.e., methanol). Titania-silica-supported vanadium catalysts have been studied in this case [291]. Later, cerium-titanium mixed oxide catalysts where studied in the partial oxidation of the methanol and methyl mercaptan to produce formaldehyde, interesting results were obtained in terms of activity and selectivity [321].…”

“…Methanol is emitted from pulping industry in rather large amounts [290], and therefore it is a suitable compound for VOC utilization purposes. There exist studies where methanol is used in production of formaldehyde over vanadium-based catalysts [291], but other potential products could be considered as well. An interesting approach to use alcohol is its possible usage in waste water treatment plants as a carbon source for denitrifying bacteria.…”

“…Converting methyl mercaptan in a gaseous feed to formaldehyde and sulfur dioxide is one rather recent example of the valorization of the TRS [291,320,321]. The process consists of contacting the gaseous stream containing methyl mercaptan with a catalysts under oxidizing conditions for sufficient time.…”

“…The pulp mill chip bin emissions contain in addition to methanol and sulfur-containing volatile organic compounds also hydrogen sulfide, terpenic compounds, amines, higher alcohols, amines, water vapor and solid particulates [290,291,330,331]. Sulfur is a well-known catalyst poison, as discussed above, which is studied very widely in different applications [332][333][334].…”