Deposition-Precipitation Synthesized CuCo/Activated Carbon Catalysts for Benzyl Alcohol Oxidation Reaction

IF 1.4 Q3 CHEMISTRY, MULTIDISCIPLINARY

Physical Chemistry Research Pub Date : 2021-09-01 DOI:10.22036/PCR.2021.247452.1833

Melody Kimi

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Abstract

The effect of Cox addition in the range of 0.1 to 1 mole into Cu supported on activated carbon (AC) catalysts fabricated by deposition-precipitation method was assessed. CuCox/AC prepared via the same method under different calcination temperature was done to evaluate the effect on the properties and activity of the catalysts. The bimetallic Cu-Co catalysts are structurally characterized by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). It was found that Co was clearly incorporated in Cu/AC lattice and improved the crystalline structure with optimum Co loading. CuCox/AC nanoparticles formed with uniform shapes and size under the present synthesis conditions. The catalytic performances of the as-prepared catalysts were evaluated towards the aerobic oxidation of benzyl alcohol using hydrogen peroxide as oxidant. Cu/AC, Co/AC and CuCox/AC showed ability to oxidize benzyl alcohol to benzaldehyde. CuCo0.2/AC calcined at 450°C showed highest catalytic activity exhibiting 86% conversion of benzyl alcohol due to the high crystallinity as compared to the monometallic counterpart. It was found that the crystallinity of the catalysts could be tuned by varying the amount of Co. The synergistic effects of Cu-Co in optimum mole ratio and calcination temperature influenced the availability of active sites participating in the catalytic activity.

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沉积-沉淀法合成苯甲醇氧化反应CuCo/活性炭催化剂

考察了在沉积沉淀法制备的活性炭(AC)催化剂上加入0.1 ~ 1mol的Cox对Cu负载的影响。采用相同的方法，在不同的煅烧温度下制备了CuCox/AC，考察了其对催化剂性能和活性的影响。采用x射线衍射(XRD)和扫描电镜(SEM)对Cu-Co双金属催化剂进行了结构表征。结果表明，Co在Cu/AC晶格中明显掺入，并在最佳Co负载下改善了晶体结构。在此合成条件下制备的CuCox/AC纳米颗粒具有均匀的形状和尺寸。以过氧化氢为氧化剂，对所制备的催化剂对苯甲醇的好氧氧化性能进行了评价。Cu/AC、Co/AC和CuCox/AC均表现出将苯甲醇氧化为苯甲醛的能力。CuCo0.2/AC在450°C下煅烧，由于结晶度高，与单金属相比较，其催化活性最高，苯甲醇转化率为86%。结果表明，不同Co的加入量可以调节催化剂的结晶度。Cu-Co在最佳摩尔比和煅烧温度下的协同作用影响了参与催化活性的活性位点的可用性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Chemistry Research CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

2.70

自引率

8.30%

发文量

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