Ammonia borane(NH_(3)BH_(3))is a reducing agent,able to trap and convert carbon dioxide.In the present work,we used a reactive solid consisting of a mixture of 90 wt.%of NH_(3)BH_(3)and 10 wt.%of palladium chloride,be...Ammonia borane(NH_(3)BH_(3))is a reducing agent,able to trap and convert carbon dioxide.In the present work,we used a reactive solid consisting of a mixture of 90 wt.%of NH_(3)BH_(3)and 10 wt.%of palladium chloride,because the mixture reacts in a fast and exothermic way while releasing H2 and generating catalytic Pd0.We took advantage of such reactivity to trap and convert CO_(2)(7 bar),knowing besides that Pd0 is a CO_(2)hydrogenation catalyst.The operation(i.e.stage 1)was effective:BNH polymers,and B−O,C=O,C−O,and C−H bonds(like in BOCH_(3)and BOOCH groups)were identified.We then(in stage 2)pyrolyzed the as-obtained solid at 1250℃ and washed it with water.In doing so,we isolated cyclotriboric acid H_(3)B3O6(stemming from B2O3 formed at 1250℃),hexagonal boron nitride,and graphitic carbon.In conclusion,the stage 1 showed that CO_(2)can be‘trapped’and converted,resulting in the formation of BOCH_(3)and BOOCH groups(possible sources of methanol and formic acid),and the stage 2 showed that CO_(2)transforms into graphitic carbon.展开更多
基金supported by TUBITAK(Project No.218M181)and CAMPUS FRANCE PHC BOSPHORUS(Project No.42161TB).CACM.and U.B.D.want to acknowledge the CONACyT(Mexican National Council for Science and Technology)for the scholarship of CA.CM(2017-2021).
文摘Ammonia borane(NH_(3)BH_(3))is a reducing agent,able to trap and convert carbon dioxide.In the present work,we used a reactive solid consisting of a mixture of 90 wt.%of NH_(3)BH_(3)and 10 wt.%of palladium chloride,because the mixture reacts in a fast and exothermic way while releasing H2 and generating catalytic Pd0.We took advantage of such reactivity to trap and convert CO_(2)(7 bar),knowing besides that Pd0 is a CO_(2)hydrogenation catalyst.The operation(i.e.stage 1)was effective:BNH polymers,and B−O,C=O,C−O,and C−H bonds(like in BOCH_(3)and BOOCH groups)were identified.We then(in stage 2)pyrolyzed the as-obtained solid at 1250℃ and washed it with water.In doing so,we isolated cyclotriboric acid H_(3)B3O6(stemming from B2O3 formed at 1250℃),hexagonal boron nitride,and graphitic carbon.In conclusion,the stage 1 showed that CO_(2)can be‘trapped’and converted,resulting in the formation of BOCH_(3)and BOOCH groups(possible sources of methanol and formic acid),and the stage 2 showed that CO_(2)transforms into graphitic carbon.
