首页|有序介孔炭负载Pt-MoOx催化剂的制备及其催化甲基环己烷脱氢性能

有序介孔炭负载Pt-MoOx催化剂的制备及其催化甲基环己烷脱氢性能

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以有序介孔炭(CMK-3)作为载体,采用原子层沉积技术制备出催化剂yPt/CMK-3及MoOx助剂调控催化剂yPt-zMoOx/CMK-3(y、z分别为Pt和MoOx的沉积循环次数),研究了沉积循环次数对Pt金属分散度和催化剂甲基环己烷脱氢性能的影响.结果表明,适中的Pt分散度和适量原子级分散的MoOx助剂能显著提升Pt基催化剂的性能.与10Pt/CMK-3相比,10Pt-1MoOx/CMK-3催化剂上的脱氢速率(单位时间内单位质量Pt产生H2的物质的量)从79.02 mol/(g·h)提高至97.88 mol/(g·h),甲基环己烷转化率由71%提高到91%.MoOx助剂加入对Pt颗粒分散度影响较小,主要提高了 Pt表面电子密度,降低了催化剂的起活温度.此外,MoO,助剂还通过氢溢流促进H2在催化剂表面的脱附,从而提高H2产率.
SYNTHESIZE OF ORDERED MESOPOROUS CARBON SUPPORTED Pt-MoOx CATALYST AND ITS CATALYTIC PERFORMANCE FOR METHYLCYCLOHEXANE DEHYDROGENATION
Using ordered mesoporous carbon(CMK-3)as a carrier,yPt/CMK-3 and MoOx additive-modulated catalyst yPt-zMoOx/CMK-3(y and z are the number of deposition cycles of Pt and MoOx,respectively)were prepared by atomic layer deposition technology.The impact of the number of deposition cycles on the dispersion of the Pt metal and the catalytic performance for the dehydrogenation of methylcyclohexane was studied.The results showed that optimal Pt dispersion and an appropriate amount of atomically dispersed MoOx additives could significantly improved the performance of Pt-based catalysts.Compared with 10Pt/CMK-3,the dehydrogenation rate(amount of H2 produced per unit mass of Pt per unit time)on the catalyst l 0Pt-1 MoOx/CMK-3 increased from 79.02 mol/(g·h)to 97.88 mol/(g·h),and the methylcyclohexane conversion rate increased from 71%to 91%.The addition of MoOx additive had little effect on the dispersion of Pt nanoparticles,mainly increased the electron density on the Pt surface and decreased the activation temperature of catalyst.In addition,the MoOx additives can promote the desorption of H2 on the catalyst surface through hydrogen overflow,thus increasing the yield of H2.

methylcyclohexaneorganic liquid hydrogen storage carrierdehydrogenation catalystadditiveordered mesoporous carbon

王森、孟繁春、李卓、杨慧敏、代晓敏、白靖、许云华、覃勇、张斌

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中国科学院山西煤炭化学研究所,太原 030001

中国科学院大学

榆林学院

甲基环己烷 有机液态储氢载体 脱氢催化剂 助剂 有序介孔炭

国家自然科学基金资助项目国家杰出青年科学基金资助项目中国科学院青年创新促进会资助项目榆林学院与大连清洁能源国家实验室合作基金资助项目山西省科技创新团队专项资金资助项目

2207217221825204Y2021056YLU-DNL Fund 2022007202304051001007

2024

石油炼制与化工
中国石油化工股份有限公司石油化工科学研究院

石油炼制与化工

CSTPCD北大核心
影响因子:0.825
ISSN:1005-2399
年,卷(期):2024.55(9)