首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Selective hydrogenation of phenol to cyclohexanone over Pd nanoparticles encaged hollow mesoporous silica catalytic nanoreactors
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Selective hydrogenation of phenol to cyclohexanone over Pd nanoparticles encaged hollow mesoporous silica catalytic nanoreactors

机译:在Pd纳米粒子上用PD纳米粒子的选择性氢化苯酚对中空介孔二氧化硅催化纳米反应器

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摘要

Pd nanoparticles (NPs) encaged hollow mesoporous silica nanoreactors (Pd@HMSNs) are prepared for hydrogenations of phenol, cresols and chlorophenols to cyclohexanone derivatives. Pd@HMSNs feature - 4 nm Pd NPs in similar to 16 nm hollow cavities of similar to 30 nm HMSNs. Such Pd@HMSNs are highly thermally and catalytically stable. At mild reaction conditions, Pd@HMSNs efficiently catalyze hydrogenations of phenol and m-cresol to cyclohexanone derivatives with >= 98.3 % selectivity at >= 99.0 % conversions. Hydrogenations of o- and m-chlorophenol over Pd@HMSNs give cyclohexanone with >= 97.3 % selectivity at 100.0 % conversions, demonstrating a beneficial effect of such HMSNs for consecutive reactions. The confinement of Pd NPs inside hollow cavities of mesoporous nanoreactors greatly promotes collision times of reactant molecules with Pd NPs, resulting in an enhanced catalytic efficiency, while the residence of Pd NPs inside cavities provides a protecting effect for Pd NPs and is beneficial to thermal and catalytic stabilities.
机译:包覆钯纳米颗粒的中空介孔二氧化硅纳米反应器(Pd@HMSNs)用于将苯酚、甲酚和氯酚氢化为环己酮衍生物。Pd@HMSNs特征:4纳米钯纳米颗粒位于类似于30纳米HMSN的16纳米空心腔中。这样的Pd@HMSNs具有高度的热稳定性和催化稳定性。在温和的反应条件下,Pd@HMSNs高效催化苯酚和间甲酚加氢生成环己酮衍生物,转化率>=99.0%,选择性>=98.3%。邻氯苯酚和间氯苯酚在水溶液中的加氢反应Pd@HMSNs在100.0%转化率下,以>=97.3%的选择性得到环己酮,证明此类HMSN对连续反应具有有益效果。将钯纳米粒子限制在介孔纳米反应器的空心空腔中,极大地促进了反应物分子与钯纳米粒子的碰撞时间,从而提高了催化效率,而钯纳米粒子在空腔中的滞留为钯纳米粒子提供了保护作用,并有利于其热稳定性和催化稳定性。

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