CoZnyB/Nb2CTx(MXene) for cinnamaldehyde hydrogenation to cinnamyl alcohol: Effects of Zn

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL Applied Catalysis A: General Pub Date : 2024-11-13 DOI:10.1016/j.apcata.2024.120024

Haixiang Shi , Qingqing Li , Tongming Su , Xuan Luo , Zuzeng Qin , Hongbing Ji

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Abstract

Amorphous cobalt boride (CoB) catalysts have superior CO selectivity for cinnamaldehyde (CAL) hydrogenation and low activity. This work prepared CoZn_yB/Nb₂CT_x(MXene) catalysts with different Zn ratios (y=0, 0.025, 0.05, 0.075, and 0.1) via a wet reduction method, which were subsequently utilized in the selective hydrogenation of CAL to cinnamyl alcohol (COL). The CoZn_0.₀₅B/Nb₂CT_x catalyst exhibited superior low-temperature activity, with 91.4 % CAL conversion and a 66.3 % COL yield. SEM and XPS analyses further revealed that Zn enhanced the catalytic activity by generating smaller amorphous alloy particles and exposing more Co⁰ active sites. Furthermore, the NH₃-TPD and adsorbed pyridine DRIFTS results showed that Zn modified the surface acidity of the CoZn_yB/Nb₂CT_x catalyst by generating both Lewis acid sites and Brønsted acid sites, which can facilitate the adsorption of CAL. This work demonstrated that Zn can increase the number of exposed active sites and modify the surface acid properties of amorphous CoB catalysts.

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用于肉桂醛氢化为肉桂醇的 CoZnyB/Nb2CTx(MXene)Zn

无定形硼化钴（CoB）催化剂在肉桂醛（CAL）加氢反应中具有优异的 CO 选择性，但活性较低。本研究通过湿还原法制备了不同锌比（y=0、0.025、0.05、0.075 和 0.1）的 CoZnyB/Nb2CTx(MXene) 催化剂，随后将其用于肉桂醛（CAL）选择性加氢为肉桂醇（COL）。CoZn0.05B/Nb2CTx 催化剂表现出卓越的低温活性，CAL 转化率为 91.4%，COL 产率为 66.3%。SEM 和 XPS 分析进一步表明，Zn 通过生成更小的无定形合金颗粒并暴露出更多的 Co0 活性位点，从而提高了催化活性。此外，NH3-TPD 和吸附吡啶的 DRIFTS 结果表明，Zn 通过生成路易斯酸位点和布伦斯特酸位点改变了 CoZnyB/Nb2CTx 催化剂的表面酸性，从而促进了 CAL 的吸附。这项工作表明，Zn 可以增加暴露的活性位点数量，改变无定形 CoB 催化剂的表面酸性。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.

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