Preparation of strongly oxygen reduction boron nitride and its catalytic performance for partial oxidation of methane
As an emerging two-dimensional inorganic material,boron nitride(BN)has been widely used in the oxidative dehydrogenation of alkanes in recent years,and it is now shown that the introduction of oxygen species makes the BN have a better catalytic performance.The oxygenated BN catalysts(n(boric acid):n(urea)=1:1,1:2,1:3 and 1:4)were prepared by direct co-fusion synthesis using boric acid as the boron source and urea as the nitrogen source.Under the conditions of temperature from 400 to 700℃,space velocity 14400 mL/(g·h)and V(CH4):V(O2)=2:1,the catalytic performances of the catalysts for partial oxidation of methane(POM)reaction were investigated.The oxygen-containing functional groups,elemental contents(mass fraction),crystalline structures and oxygen reduction abilities of the catalysts were characterized by FT-IR,ICP-OES,XRD and cyclic voltammetry(CV).The results show that in POM reaction,the catalyst(BN-1:2)under the condition of n(boric acid):n(urea)=1:2 exhibites the best catalytic performance(CH4 conversion rate of 43%,CO selectivity of 72%and H2 selectivity of 17%).Compared with the other three catalysts,BN-1:2 has the highest crystallinity,which makes the interaction between BN-1:2 and O2 stronger and promotes O2 activation.BN-1:2 has the highest current density in CV tests,indicating that it has the strongest oxygen reduction capability(3.4889×10-4 A/cm2),which promotes active site formation and thus exhibits better catalytic performance.
boron nitridepartial oxidation of methaneoxygen reduction capabilitycatalysts
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