盐酸处理对用于糠醛氢化的 Pd/TiO2 酸度的影响

IF 3.8 3区化学 Q2 CHEMISTRY, PHYSICAL

Catalysts Pub Date : 2023-11-29 DOI:10.3390/catal13121481

Hye Jin Song, Ye Eun Kim, J. Jae, Man Sig Lee

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引用次数: 0

摘要

支持物的酸性可对其催化行为产生积极影响。本文研究了盐酸处理 TiO2 对其酸性和催化活性的影响。用不同摩尔浓度的盐酸处理二氧化钛。随后，通过沉积-沉淀法在处理过的 TiO2 上沉积钯；在此，催化剂表示为 Pd/xH-T，其中 X 为盐酸的摩尔浓度。显而易见，TiO2 中的强酸含量随着盐酸处理的增加而增加，而用高浓度（5 M）盐酸处理的 TiO2 中的强酸含量则减少了。在支持钯后，酸量比支持二氧化钛的酸量略有减少，但酸量的顺序相似。强酸密度增加，Pd/2H-T 的酸含量最高，而 Pd/5H-T 的酸含量最低。Pd/2H-T 催化剂对 THFA 的选择性最高（95.4%），从而证实了 THFA 的选择性与强酸含量相关。因此，THFA 的选择性受强酸位点数量的影响。

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Effect of HCl Treatment on Acidity of Pd/TiO2 for Furfural Hydrogenation

The acidity of supports can have a positive effect on their catalytic behaviors. Herein, the effects of HCl treatment of TiO2 on its acidic properties and catalytic activity were investigated. TiO2 was treated with various molar concentrations of HCl. Subsequently, Pd was deposited on the treated TiO2 via the deposition–precipitation method; here, the catalysts were denoted as Pd/xH-T, where X is the molar concentration of HCl. Evidently, the amount of strong acid in TiO2 increased with HCl treatment, whereas that in TiO2 treated with a high concentration (5 M) of HCl decreased. After Pd was supported, the amount of acid slightly decreased compared with that on the TiO2 support; however, the order of the acid amounts was similar. The strong acid density increased such that Pd/2H-T had the highest acid content, whereas Pd/5H-T had the lowest. The Pd/2H-T catalyst exhibited the highest selectivity for THFA (95.4%), thus confirming that the selectivity for THFA is correlated with the amount of strong acid. Thus, THFA selectivity is affected by the number of strongly acid sites.

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来源期刊

Catalysts CHEMISTRY, PHYSICAL-

CiteScore

6.80

自引率

7.70%

发文量

1330

审稿时长

3 months

期刊介绍： Catalysts (ISSN 2073-4344) is an international open access journal of catalysts and catalyzed reactions. Catalysts publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.