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首页> 外文期刊>RSC Advances >Combustion of lean methane over Co3O4 catalysts prepared with different cobalt precursors
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Combustion of lean methane over Co3O4 catalysts prepared with different cobalt precursors

机译：用不同钴前体制备的CO3O4催化剂的贫甲烷燃烧

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摘要

To investigate the effect of catalyst precursors on physicochemical properties and activity of lean methane catalytic combustion, a series of Co _(3) O _(4) catalysts were prepared via a precipitation method by using four different cobalt precursors: Co(C _(2) H _(3) O _(2) ) _(2) , Co(NO _(3) ) _(2) , CoCl _(2) , and CoSO _(4) . The catalysts were characterized by BET, XRD, SEM, Raman, XPS, XRF, O _(2) -TPD and H _(2) -TPR techniques. It was found that the different types of cobalt precursor had remarkable effects on the surface area, particle size, reducibility and catalytic performance. In contrast, the Co _(3) O _(4) -Ac catalyst showed a relatively small surface area, but its activity and stability were the highest. XPS, Raman, O _(2) -TPD and H _(2) -TPR results demonstrated that the superior catalytic performance of Co _(3) O _(4) -Ac was associated with its higher Co ~(2+) concentration, more surface active oxygen species and better reducibility. In addition, the activity of the Co _(3) O _(4) -S catalyst reduced significantly due to the residual impurity SO _(4) ~(2?) , which could reduce the concentration of surface adsorbed active oxygen species and inhibit oxygen migration.
机译：为了探讨催化剂前体对贫甲烷催化燃烧的物理化学性质和活性的影响，通过使用四种不同的钴前体来制备一系列CO _（3）O _（4）催化剂：CO（C _（ 2）H _（3）O _（2））_（2），CO（NO _（3））_（2），COCL _（2）和COSO _（4）。通过BET，XRD，SEM，拉曼，XPS，XRF，O _（2）-TPD和H _（2）-TPR技术，表征催化剂。结果发现，不同类型的钴前体对表面积，粒度，再施加性和催化性能具有显着影响。相反，CO _（3）O _（4）-Ac催化剂显示出相对小的表面积，但其活性和稳定性最高。 XPS，拉曼，O _（2）-TPD和H _（2）-TPR结果表明CO _（3）O _（4）-Ac的优异催化性能与其更高的CO〜（2+）相关浓度，表面活性氧物种更好，更好的再减产。另外，由于残余杂质所以_（4）〜（2？），CO _（3）O _（4）-S催化剂的活性显着降低，这可以降低表面吸附活性氧物质的浓度和抑制氧气迁移。

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