Synthesis and application of semi-packaged Pd nanoparticle loaded mesoporous TiO2 nanorod photocatalyst
A nanoparticle and photocatalyst technology, which is applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, ammonia compounds, etc., and can solve the problem of easy falling off, stability, and easy deactivation of loaded metal nanoparticles. problem, to achieve the effect of strong feasibility, simple operation process and low utilization rate
Pending Publication Date: 2022-05-31
GUANGZHOU UNIVERSITY
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[0004] Aiming at the deficiencies of the prior art, the present invention provides the synthesis and application of semi-encapsulated Pd nanoparticles-loaded mesoporous TiO2 nanorod photocatalysts, capable of effectively constructing rich N 2 Adsorption of binding sites to optimize pNRR activity and other advantages solves the disadvantages of modified oxygen vacancies (OVs), heteroatoms and other sites are easy to deactivate, and loaded metal nanoparticles are easy to fall off and have poor stability
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Embodiment 1
[0035] Example 1: A semi-encapsulated palladium nanoparticle load mesoporous titanium dioxide nanorod (denoted se-Pd / m-TiO 2 NRs) photocatalyst preparation method, comprising the following steps:
[0036] (1) The synthesis of m-TiO is controlled by electrospinning and subsequent calcination process 2 NRs：
[0037] Weigh polyvinylpyrrolidone (PVP) in 14wt% ethanol solution, stir at room temperature for 12h to a clear and transparent solution, and set aside. Ethanol, acetate, tetrabutyl titanate (TBT) are prepared into a 3:3:1 molar ratio mixture and kept in an ice water bath with a strong stirring for 30min. Finally, the 14wt% PVP ethanol solution configured above was added to the mixture with a control mass ratio of 1:1 and kept in an ice bath overnight and stirred until the light yellow transparent solution. The electrostatic spinning equipment (QZNT-E01) of Foshan Lepton Precision Measurement and Control Technology Co., Ltd. is used to achieve an electrostatic voltage of 19 kV...
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The invention discloses synthesis and application of a semi-packaged Pd nanoparticle-loaded mesoporous TiO2 nanorod photocatalyst, and the preparation of mesoporous TiO2 nanorods comprises the following steps: S1, weighing polyvinylpyrrolidone to prepare an ethanol solution, stirring at room temperature to obtain a clear and transparent solution, preparing for later use, and filtering to obtain a filtrate; s2, ethanol, acetic acid and tetrabutyl titanate are sequentially prepared into a mixed solution according to a certain molar ratio, and the mixed solution is kept in an ice-water bath to be evenly stirred; according to synthesis and application of the semi-packaged Pd nanoparticle loaded mesoporous TiO2 nanorod photocatalyst, a photocatalytic material based on semi-embedding of plasma metal Pd into mesoporous TiO2 nanorods is provided, and nitrogen reduction ammonia synthesis reaction is carried out by effectively utilizing full spectrum at normal temperature and pressure. Plasma metal Pd is semi-packaged in a mesoporous TiO2 substrate to form an excellent Ti-Pd interface, Pd metal sites on the surface are semi-exposed, and rich N2 adsorption binding sites are effectively constructed to optimize pNRR activity.
Description
Technical field [0001] The present invention relates to the field of nanoparticle technology, specifically the synthesis and application of a semi-encapsulated Pd nanoparticle-loaded mesoporous TiO2 nanorod photocatalyst. Background [0002] Ammonia (NH 3 ) is an indispensable chemical substance in modern society, is the basic ingredient in the manufacture of drugs, fertilizers, resins, dyes, explosives and other synthetic chemicals, will be NH 3 When condensed into a liquid, with hydrogen (H 2 In contrast, with considerable energy density and transportability, it can be used for powered fuel cells in the short term, however, currently industrial catalytic nitrogen (N 2 ) synthetic NH 3 The technology is still the Haber-Bosch method of more than 100 years ago, which emits 3% of the world's carbon dioxide (CO). 2 , methane reforming process release), which consumes 1%-3% of the world's total global energy per year (ACS Catal.2021, 11,9986-9995), in the implementation of carbon pea...
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IPC IPC(8): B01J23/44C01C1/04
CPCB01J23/44C01C1/026C01C1/02B01J35/39Y02P20/52
Inventor 韩冬雪潘国亮牛利张文生谢相伦王昊宇
Owner GUANGZHOU UNIVERSITY