Preparation of Nano Pd/C Catalyst for Purification of Terephthalic Acid by Sol-Gel Method

The traditional method of preparing 0.5 wt.% nano Pd/C catalysts used for pure terephthalic acid(PTA) refining is the precipitate-reduction method, and this paper proposed the sol-gel method, in which the palladium colloid was firstly prepared, and followed by the load process onto the activated carbon. The activity and microstructure of catalysts were investigated by means of SEM, TEM, EDS，XRD and HPLC. It was found that the activity of catalyst with the sol-gel method was much higher than that with precipitate-reduction method. The preparation technology has less effects on the micostructure of Pd/C catalysts, while the palladium particles of catalyst obtained with sol-gel method are much finer and the relatively palladium content is much higher.These two factors contribute to the higher activity of Pd/C catalyst.

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Preparation of silica antireflection film based on sol-gel method

E3S Web of Conferences ◽

10.1051/e3sconf/202126702017 ◽

2021 ◽

Vol 267 ◽

pp. 02017

Author(s):

Zheyu Jiang ◽

Qiuyi Wan ◽

Jiarong Liu ◽

Xiujun Tian

Keyword(s):

High Performance ◽

Sol Gel ◽

Energy Utilization ◽

General Situation ◽

Specific Method ◽

Preparation Technology ◽

Gel Method ◽

Sol Gel Method ◽

Triton X ◽

Current Energy

Glass antireflection membrane can effectively increase the collection and utilization of sunlight by daylighting equipment, and has been widely used in solar energy related fields. Therefore, exploring the development of high-performance glass antireflection membrane is an essential topic in the current energy utilization research. This paper introduces the general situation of the preparation technology of antireflection membrane internationally, especially the specific method of producing antireflection membrane of silica by sol-gel method in the research. According to the analysis of the results, the significance of membrane surfactant which is similar to Triton X-100 was obtained, and the development prospect of this technology was discussed.

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Ionic Liquids/SiO2 Supporting Pd Nanoparticles: Efficient Catalysts in Hydrogenation Reaction

Nanomaterial Chemistry and Technology ◽

10.33805/2690-2575-110 ◽

2021 ◽

pp. 8-12

Author(s):

Hartz Taís ◽

Fischer Daiane ◽

Karina de Fraga ◽

Scheeren Carla

Keyword(s):

Ionic Liquids ◽

Palladium Nanoparticles ◽

Sol Gel ◽

Pd Nanoparticles ◽

Hydrogenation Reaction ◽

Gel Method ◽

Sol Gel Method ◽

Sol Gel Process ◽

Acidic Conditions ◽

Palladium Content

Palladium nanoparticles (ca. 4.8 nm) were synthesized in presence of 1-n-butyl-3-methylimidazolium tetraflouroborate (BMI.BF4) and 1-n-butyl-3-methylimidazolium hexafluorophosphate (BMI.PF6) and PMI.Si.(OMe)3.Cl functionalized ionic liquids using the sol-gel method. The characteristics of the sol-gel method, ionic liquid on the palladium content was studied, as well as the silica morphology and texture of the support and the hydrogenation activity. The palladium content in the resulting xerogels (ca. 0.22 wt% Pd/SiO2) was shown to be independent of the sol-gel process. The xerogels synthesized in acidic conditions formed materials with larger pore diameters, which in turn might be responsible for the higher catalytic activity in hydrogenation of the alkenes and arenes obtained with the heterogeneous catalyst (Pd/ILs/SiO2).

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