Synthesis of size-controlled Pt/C/PTFE hydrophobic catalyst pellets in a capillary-based microfluidic system

Song, Zi-Fan; Wei, Jun; Li, Xiang; Zhou, Weiyue; Chang, Zhenqi; Serra, Christophe A.

doi:10.1016/j.ijhydene.2014.08.045

Cited by 15 publications

(6 citation statements)

References 20 publications

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“…In an interesting study, Khan et al [59] prepared micro particles sensitive to environmental pH, which permits to modulate release rate by pH changes. Another example is the work of Song et al [60] which describe the fabrication of narrow size-distribution catalyst beads using capillaries. In all of these applications, droplet and particle dimensions can be modified varying solution flow rates and capillary dimensions, and in some conditions sizes can be predicted from fluid flow profiles.…”

Section: Organic and Medicinal Chemistry International Journalmentioning

confidence: 99%

The Role of Micro fluidic Systems in Biological and Medical Sciences

Helbling¹

2017

OMCIJ

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Micro fluidics is a young discipline. During its beginning, it was mainly an academic field in where researchers study the behavior of fluids at micro scale and how it can be modified with operative and experimental variables. Then, the focus was placed on studying device fabrication process and how to optimize them to lower costs and time, and to enhance system features. After a period of maturation, micro fluidic researchers began to evaluate system usefulness and the possibility of use them in different areas. Micro fluidics became a multidisciplinary field combining concepts of biological and medical sciences and engineering. Diagnostic test, micro particles fabrications, contaminant detection, and medical analyses were first goals. Then, its uses expanded exponentially to other areas opening a world of possibilities. With the advances in miniaturization and material sciences as well as the boom in micro and nanotechnology, manufacturing process became highly precise. New applications in biochemistry, biotechnology, biology and medical sciences were appearing attracting the interest of the industrial sector. Since then, projects are aimed to develop micro fluidic systems with industrial applications. The present contribution describes the characteristics of the three major type of micro fluidic systems, chip-based, capillary-based and paper-based systems. Advantages and limitations of each one are mentioned. In addition, their most important applications in biological and medical sciences are presented.

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Section: Organic and Medicinal Chemistry International Journalmentioning

confidence: 99%

The Role of Micro fluidic Systems in Biological and Medical Sciences

Helbling¹

2017

OMCIJ

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“…To avoid such water poisoning, many researchers have been making efforts to increase hydrophobicity of the supports. Pt nanoparticles (Pt NPs) or Pt-loaded catalysts mixed with various hydrophobic supports, such as styrene-divinylbenzene copolymer (SDB), polytetrafluoroethylene (PTFE), polydimethylsiloxane (PDMS), and so on, were developed for catalyst packing for catalyzing LPCE much more stably and efficiently. − In a comparison of the direct mixture of Pt NPs and the above hydrophobic supports (defined as the first support), the Pt-loaded catalyst plays a more efficient role because another hydrophobic component (defined as the second support) is introduced first to increase the proportion of active sites actually exposed. , Although the efficiency of the catalytic exchange process was improved through increasing the dispersion of the Pt site, due to the water molecules involved in the reaction, severe internal diffusion resistance for water molecules reaching the Pt active site still exists in the channels of second support. In fact, to achieve the high efficiency of LPCE, more than 50% of the hydrophilic packings were usually filled into the reaction column to enhance the efficient contact between hydrophobic catalyst and liquid water containing deuterium or tritium .…”

Section: Introductionmentioning

confidence: 99%

Hydrophilic Amino Groups Acted in the Hydrophobic Reaction Environment for Efficient Hydrogen Isotopes Enrichment

Feng

Yin

2023

ACS Appl. Mater. Interfaces

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Hydrogen isotope enrichment through liquid-phase catalytic exchange (LPCE) technology is achieved in a hydrophobic reaction environment to avoid liquid water poisoning, but the usage of hydrophobic support severely inhibits the internal diffusion of water molecules to decrease the catalytic efficiency. Herein, we encapsulate platinum active sites into a metal organic framework (Pt@NH 2 −UiO-66) as the efficient catalyst for LPCE via introducing hydrophilic amino groups. Experiments and density functional theory simulation reveal amino groups in the channel as the adsorption site of water molecules accelerates the internal diffusion and slows down the accumulation on the platinum sites. Meanwhile, the amino groups interact with the Pt site bridge electron transfer from active sites to support the host, thus decreasing the catalytic reaction and generated water desorption barrier. Due to these positive roles, the turnover frequency of Pt@NH 2 −UiO-66 reaches 2272 h −1 in a microchannel reactor. This work provides a novel design strategy of catalysts in LPCE.

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“…Pt is widely used in LPCE and shows high catalytic activities [1a,13] . In general, there are two factors that affect the catalytic activity of hydrophobic catalysts, namely particle size and distribution of Pt nanoparticles [14] .…”

Section: Introductionmentioning

confidence: 99%

Liquid‐Phase Catalytic Exchange of Hydrogen Isotopes over Ion Sputtering Platinum on Superhydrophobic Coatings

Liu

Feng²,

et al. 2022

ChemNanoMat

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Liquid‐phase catalytic exchange (LPCE) of hydrogen isotopes has extensive application in upgrading of recycled water and wastewater treatment. This low‐temperature catalytic exchange requires hydrophobic catalysts for keeping high exchange efficiency and catalytic stability. To eliminate diffusional influences in conventional porous catalysts, we designed a flat catalyst coating with fully exposed platinum (Pt) active sites by two steps. The hydrophobic coating was firstly established by superhydrophobic silica nanospheres (SSNs) and then Pt nanoparticles were dispersed on the surface of coating by ion sputtering. By adjusting the time of ion sputtering, the catalytic exchange efficiency of optimized catalyst coating (50‐Pt/SSNs/PDMS) improved up to 86% at 60 °C and maintained stability for at least 5 h, behaving high catalytic exchange efficiency and good stability. Besides, the turnover frequency of the 50‐Pt/SSNs/PDMS was 1.7 times than that of “PDMS+Pt/SSNs” prepared by “glue+power” method. The “step by step” strategy can effectively improve the utilization of Pt and provide a new idea for the preparation of Pt‐based hydrophobic catalysts.

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Synthesis of size-controlled Pt/C/PTFE hydrophobic catalyst pellets in a capillary-based microfluidic system

Cited by 15 publications

References 20 publications

The Role of Micro fluidic Systems in Biological and Medical Sciences

The Role of Micro fluidic Systems in Biological and Medical Sciences

Hydrophilic Amino Groups Acted in the Hydrophobic Reaction Environment for Efficient Hydrogen Isotopes Enrichment

Liquid‐Phase Catalytic Exchange of Hydrogen Isotopes over Ion Sputtering Platinum on Superhydrophobic Coatings

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