An insight on the role of La in mesoporous WO 3 for the photocatalytic conversion of methane into methanol

Villa, Katherine; Murcia-López, Sebastián; Morante, Joan Ramón; Andreu, Teresa

doi:10.1016/j.apcatb.2016.01.032

Cited by 126 publications

(76 citation statements)

References 41 publications

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“…Photocatalytic conversion of methane to liquid fuels still remains in its infancy as only few attentions were paid. WO 3 has been a classic material in this field supplying hydroxyl radical (·OH) through H 2 O oxidation to turn methane into methanol 10–13 . In addition to WO 3 , bismuth-based compounds such as BiVO 4 and Bi 2 WO 6 have also been estimated 14 , while reports of V containing zeolites have emerged recently about tuning the surface acid−base properties to a better methanol selectivity 15,16 .…”

Section: Introductionmentioning

confidence: 99%

Direct functionalization of methane into ethanol over copper modified polymeric carbon nitride via photocatalysis

2019

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Direct valorization of methane to its alcohol derivative remains a great challenge. Photocatalysis arises as a promising green strategy which could exploit hydroxyl radical (·OH) to accomplish methane activation. However, both the excessive ·OH from direct H2O oxidation and the neglect of methane activation on the material would cause deep mineralization. Here we introduce Cu species into polymeric carbon nitride (PCN), accomplishing photocatalytic anaerobic methane conversion for the first time with an ethanol productivity of 106 μmol gcat−1 h−1. Cu modified PCN could manage generation and in situ decomposition of H2O2 to produce ·OH, of which Cu species are also active sites for methane adsorption and activation. These features avoid excess ·OH for overoxidation and facilitate methane conversion. Moreover, a hypothetic mechanism through a methane-methanol-ethanol pathway is proposed, emphasizing the synergy of Cu species and the adjacent C atom in PCN for obtaining C2 product.

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Section: Introductionmentioning

confidence: 99%

Direct functionalization of methane into ethanol over copper modified polymeric carbon nitride via photocatalysis

2019

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“…A limited number of papers 16,17 have also addressed combined photo-thermocatalytic 18 or plasma-enhanced 19 methane dry reforming, which represents an interesting route for production of carbon monoxide and hydrogen. A few reports 20–23 also suggest that methane photo-oxidation can produce methanol, though extremely low yields have been achieved.…”

Section: Introductionmentioning

confidence: 99%

Selective photocatalytic conversion of methane into carbon monoxide over zinc-heteropolyacid-titania nanocomposites

Yu¹,

Waele²,

Löfberg³

et al. 2019

Nat Commun

119

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Chemical utilization of vast fossil and renewable feedstocks of methane remains one of the most important challenges of modern chemistry. Herein, we report direct and selective methane photocatalytic oxidation at ambient conditions into carbon monoxide, which is an important chemical intermediate and a platform molecule. The composite catalysts on the basis of zinc, tungstophosphoric acid and titania exhibit exceptional performance in this reaction, high carbon monoxide selectivity and quantum efficiency of 7.1% at 362 nm. In-situ Fourier transform infrared and X-ray photoelectron spectroscopy suggest that the catalytic performance can be attributed to zinc species highly dispersed on tungstophosphoric acid /titania, which undergo reduction and oxidation cycles during the reaction according to the Mars–van Krevelen sequence. The reaction proceeds via intermediate formation of surface methyl carbonates.

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“…Therefore, the observed promotion of CO 2 reduction photoactivity induced by La in TiO 2 appears to come by the hand of two factors: an electronic one related to hindered electron-hole recombination and a surficial one resulting in enhanced reactant adsorption. Regarding the second factor, not only quantitatively enhanced adsorption is observed with the introduction of La phases, but also adsorbed CO 2 appears to be more labile in La/TiO 2 catalysts with respect to bare titania that favors the formation of more stable carbonate and bicarbonate species, as revealed by the desorption temperatures [31,32]. The combination of both factors result in enhanced activity in La/TiO 2 samples with La content up to 5%, with optimal quantum efficiency in the 0.5La/TiO 2 catalyst.…”

Section: Catalytic Performancementioning

confidence: 97%

Effect of La as Promoter in the Photoreduction of CO2 Over TiO2 Catalysts

et al. 2017

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An insight on the role of La in mesoporous WO 3 for the photocatalytic conversion of methane into methanol

Cited by 126 publications

References 41 publications

Direct functionalization of methane into ethanol over copper modified polymeric carbon nitride via photocatalysis

Direct functionalization of methane into ethanol over copper modified polymeric carbon nitride via photocatalysis

Selective photocatalytic conversion of methane into carbon monoxide over zinc-heteropolyacid-titania nanocomposites

Effect of La as Promoter in the Photoreduction of CO2 Over TiO2 Catalysts

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