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用于CO氧化的Pd/TiO/Ti催化剂的锌改性

Zn Modification of Pd/TiO/Ti Catalyst for CO Oxidation.

作者信息

Samadi Payam, Binczarski Michal J, Maniukiewicz Waldemar, Pawlaczyk Aleksandra, Rogowski Jacek, Szubiakiewicz Elzbieta, Szynkowska-Jozwik Malgorzata I, Witonska Izabela A

机构信息

Institute of General and Ecological Chemistry, Lodz University of Technology, 116 Zeromskiego Street, 90-924 Lodz, Poland.

出版信息

Materials (Basel). 2023 Jan 31;16(3):1216. doi: 10.3390/ma16031216.

DOI:10.3390/ma16031216
PMID:36770219
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9921276/
Abstract

The main goal of this study was to modify the activity of Pd/TiO/Ti catalyst in the reaction of CO oxidation by the addition of Zn. Plasma electrolytic oxidation (PEO) of Ti wire was conducted to produce a uniform porous layer of TiO. A mixture of Pd and Zn was then introduced by means of adsorption. After reduction treatment, the activity of the samples was examined by oxidation of 5% CO in a temperature range from 80-350 °C. Model catalysts with sufficient amounts of the metals for physico-chemical investigation were prepared to further investigate the reaction between Pd and Zn during CO oxidation. The structures and compositions of the samples were investigated using scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS), time-of-flight secondary ion mass spectrometry (TOF-SIMS), inductively coupled plasma mass spectrometry (ICP-MS), Fourier transform infrared (FTIR), and X-ray diffraction (XRD). Modification of Pd/TiO/Ti catalyst by Zn with a Pd:Zn atomic ratio of 2:1 decreased the temperature of complete CO oxidation from 220 °C for Pd/TiO/Ti to 180 °C for Pd-Zn/TiO/Ti. The temperature of 50% CO conversion on Pd-Zn(2:1)/TiO/Ti was around 55 °C lower than in the reaction on monometallic Pd catalyst. The addition of Zn to the Pd catalyst lowered the binding energy of CO on the surface and improved the dissociative adsorption of oxygen, facilitating the oxidation of CO. FTIR showed that the bridging form of adsorbed CO is preferred on bimetallic systems. Analysis of the surface compositions of the samples (SEM-EDS, TOF-SIMS) showed higher amounts of oxygen on the bimetallic systems.

摘要

本研究的主要目标是通过添加锌来改变Pd/TiO/Ti催化剂在CO氧化反应中的活性。对钛丝进行等离子体电解氧化（PEO）以制备均匀的TiO多孔层。然后通过吸附引入Pd和Zn的混合物。经过还原处理后，在80 - 350°C的温度范围内通过5% CO的氧化来检测样品的活性。制备了含有足够量金属用于物理化学研究的模型催化剂，以进一步研究CO氧化过程中Pd与Zn之间的反应。使用扫描电子显微镜结合能谱仪（SEM - EDS）、飞行时间二次离子质谱仪（TOF - SIMS）、电感耦合等离子体质谱仪（ICP - MS）、傅里叶变换红外光谱仪（FTIR）和X射线衍射仪（XRD）对样品的结构和组成进行了研究。当Pd:Zn原子比为2:1时，用Zn对Pd/TiO/Ti催化剂进行改性，使CO完全氧化的温度从Pd/TiO/Ti的220°C降至Pd - Zn/TiO/Ti的180°C。在Pd - Zn(2:1)/TiO/Ti上CO转化率达到50%时的温度比单金属Pd催化剂反应中的温度低约55°C。向Pd催化剂中添加Zn降低了CO在表面的结合能，并改善了氧的解离吸附，促进了CO的氧化。FTIR表明，在双金属体系上，吸附CO的桥式结构更受青睐。对样品表面组成的分析（SEM - EDS、TOF - SIMS）表明，双金属体系上的氧含量更高。

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Photoinduced Deposition of Platinum from (BuN)[Pt(NO)] for a Low Pt-Loading Pt/TiO Hydrogen Photogeneration Catalyst.用于低铂负载量Pt/TiO₂光生氢催化剂的由(BuN)[Pt(NO)]光诱导沉积铂
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Benzyl alcohol oxidation with Pd-Zn/TiO: computational and experimental studies.
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The CO oxidation mechanism and reactivity on PdZn alloys.PdZn 合金上 CO 氧化的反应机理和反应活性。
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