Lately, a analysis crew led by Prof. Huang Weixin from the College of Science and Expertise of China (USTC) of the Chinese language Academy of Sciences (CAS) realized the manufacturing of oxygenated chemical compounds from methane and H2O2 with oxide semiconductor as photocatalyst, revealed a brand new technique for bettering H2O2 utilization and photocatalytic conversion effectivity from methane to oxygenates, and studied the photocatalytic exercise and selectivity by tuning TiO2 aspects.
This work was printed in Nature Communications.
Methane has been more and more thought-about as a attainable carbon useful resource, however it’s a main problem to transform methane to value-added chemical compounds with each excessive exercise and selectivity.
H2O2 is a standard oxidant that would photocatalytically convert liquid-phase methane to value-added chemical compounds. It reacts with photogenerated electrons and produce ·OH radicals or ·OOH radicals, which is an efficient activation technique. Sadly, H2O2 is topic to aspect reactions with photogenerated holes and tends to transform itself to O2, lowering its utilization.
On this examine, the researchers aerated O2 into the semiconductor photocatalytic response system containing methane and H2O2, and located that H2O2 utilization was enhanced. They found that the adsorption of O2 onto the floor of TiO2 inhibited the adsorption of H2O2, which suppressed aspect reactions.
As well as, the researchers noticed that photocatalytic exercise and selectivity was decided by TiO2 aspects. In advantage of theoretical calculation, they found that it was the desorption power of various merchandise on completely different TiO2 aspects that accounted for the completely different catalytic selectivity. For instance, CH3OOH had low desorption power on TiO2{101}, thus it was the one liquid-phase product of TiO2{101}-C3N4 composite.
This work supplied a brand new technique for bettering H2O2 utilization and conversion effectivity within the photocatalytic conversion from methane to oxygenates. It additionally manifested the position that the catalyst aspects performed throughout photocatalytic reactions.
Extra data:
Xiao Solar et al, Molecular oxygen enhances H2O2 utilization for the photocatalytic conversion of methane to liquid-phase oxygenates, Nature Communications (2022). DOI: 10.1038/s41467-022-34563-4
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