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在不同熔融盐合成条件下生成的多钛酸钾水溶胶中 HO 的催化分解。

Catalytic Decomposition of HO in the Aqueous Dispersions of the Potassium Polytitanates Produced in Different Conditions of Molten Salt Synthesis.

机构信息

Department of Materials Chemistry and Technology, Yuri Gagarin State Technical University of Saratov, Polytekhnicheskaya 77, Saratov 410054, Russia.

N.N. Semenov Federal Research Center of Chemical Physics, Russian Academy of Sciences, Kosygina 4, Moscow 119991, Russia.

出版信息

Molecules. 2023 Jun 23;28(13):4945. doi: 10.3390/molecules28134945.

DOI:10.3390/molecules28134945
PMID:37446607
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10343628/
Abstract

It is shown that the potassium polytitanate powder (PPT) synthesized at 500 °C via the treatment of powdered TiO (rutile) in molten mixtures of KOH and KNO is a cheap and effective catalyst of HO chemical decomposition in aqueous solutions. At the same time, the PPT catalytic activity strongly depends on the [TiO]:[KOH]:[KNO] weight ratio in the mixture used for the synthesis, increasing with [KNO] in the order of PPT (30:30:40) < PPT (30:50:20) < PPT (30:70:0). The obtained results are explained by increased [Ti] in the PPT structure (XPS data), which is grown in this order from 0 to 4.0 and 21.9 at.%, respectively, due to the reduced oxidation activity of the melt used for PPT synthesis. The mechanism of the autocatalytic process taking place in the PPT-HO-HO system is analyzed. Taking into account the data of FT-IR spectroscopy, it is assumed that the increased catalytic activity of the investigated materials is related to the increased surface concentration of the Ti-O(H)-Ti groups, formed from the Ti-O(HO)-Ti clusters and further transformed into Ti-O-O-H catalytic centers. Some possible applications of the PPT-HO-HO catalytic system, including the oxidation processes of green chemistry and photo-catalysis, are discussed.

摘要

研究表明，通过在熔融的 KOH 和 KNO 混合物中处理 TiO（金红石）粉末，在 500°C 下合成的多钛酸钾粉末（PPT）是一种廉价且有效的 HO 化学分解在水溶液中的催化剂。同时，PPT 的催化活性强烈依赖于用于合成的混合物中[TiO]：[KOH]：[KNO]的重量比，随着[KNO]的增加，按 PPT（30：30：40）<PPT（30：50：20）<PPT（30：70：0）的顺序增加。实验结果通过 XPS 数据表明，PPT 结构中的[Ti]增加，分别从 0 增加到 4.0 和 21.9 at.%，这是由于用于 PPT 合成的熔体的氧化活性降低所致。分析了在 PPT-HO-HO 体系中发生的自催化过程的机制。考虑到傅里叶变换红外光谱（FT-IR spectroscopy）的数据，假设所研究材料的催化活性增加与 Ti-O(H)-Ti 基团的表面浓度增加有关，这些基团是由 Ti-O(HO)-Ti 簇形成的，然后进一步转化为 Ti-O-O-H 催化中心。讨论了 PPT-HO-HO 催化体系的一些可能应用，包括绿色化学和光催化氧化过程。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/a58f6b35b8f1/molecules-28-04945-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/1fae155b4dc0/molecules-28-04945-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/22f3735a1fcb/molecules-28-04945-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/4c1dd8998935/molecules-28-04945-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/ebd248ae4f04/molecules-28-04945-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/0f8aa4b00896/molecules-28-04945-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/1b2150dfe5d4/molecules-28-04945-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/879a84fc1163/molecules-28-04945-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/a20b8bacc8ee/molecules-28-04945-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/a58f6b35b8f1/molecules-28-04945-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/1fae155b4dc0/molecules-28-04945-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/22f3735a1fcb/molecules-28-04945-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/4c1dd8998935/molecules-28-04945-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/ebd248ae4f04/molecules-28-04945-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/0f8aa4b00896/molecules-28-04945-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/1b2150dfe5d4/molecules-28-04945-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/879a84fc1163/molecules-28-04945-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/a20b8bacc8ee/molecules-28-04945-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad88/10343628/a58f6b35b8f1/molecules-28-04945-g009.jpg

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