CAJ | 학술논문

用自组装法制备了一种具有核–壳结构的Pd-Co3 O4@SiO2催化剂,对其低浓度甲烷催化燃烧性能进行了研究。TEM、XRD、H2-TPR表征及催化活性测试结果表明,SiO2壳内的PdO与CoOx之间的强相互作用,使得Pd-Co3 O4@SiO2对低浓度甲烷燃烧具有优异的催化活性。同时,与负载型Pd/Co3 O4-SiO2及Pd/Co3 O4@SiO2催化剂相比,核-壳型Pd-Co3 O4@SiO2催化剂经800℃煅烧后仍能保持较好的核-壳结构,有效地避免了Pd和Co活性物种的高温烧结,因而具有更高的热稳定性。
용자조장법제비료일충구유핵–각결구적Pd-Co3 O4@SiO2최화제,대기저농도갑완최화연소성능진행료연구。TEM、XRD、H2-TPR표정급최화활성측시결과표명,SiO2각내적PdO여CoOx지간적강상호작용,사득Pd-Co3 O4@SiO2대저농도갑완연소구유우이적최화활성。동시,여부재형Pd/Co3 O4-SiO2급Pd/Co3 O4@SiO2최화제상비,핵-각형Pd-Co3 O4@SiO2최화제경800℃단소후잉능보지교호적핵-각결구,유효지피면료Pd화Co활성물충적고온소결,인이구유경고적열은정성。
A core-shell structured Pd-Co3 O4@SiO2 catalyst was prepared by a simple self-assemble method and used in lean methane combustion. The results of catalytic tests indicate that the core-shell Pd-Co3 O4@ SiO2 catalyst exhibits high activity in lean methane combustion and superior stability at high temperature. The results of TEM, XRD, and H2-TPR characterization suggest that the high activity of Pd-Co3 O4@SiO2 is mainly ascribed to the strong interaction between CoOx and PdO species inside the SiO2 shell. Meanwhile, as the active Pd and CoOx species in Pd-Co3 O4@ SiO2 are enshielded in the core-shell structure, which is effective to protect the active phase from sintering at high temperature, the core-shell structured Pd-Co3 O4@SiO2 catalyst is thus far superior in thermal stability against high temperature to the supported Pd/Co3 O4@ SiO2 and Pd/Co3 O4-SiO2 catalysts.