Catalytic exchange of hydrogen isotopes intensified by two-phase stratified flow in wettability designable microchannels

Song, Yuexiao; Feng, Xin; Xu, Yongsheng

doi:10.1039/d0lc00250j

Cited by 10 publications

(7 citation statements)

References 44 publications

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“…Firstly, we successfully supported Pt nanoparticles on the superhydrophobic coatings to prepare the superhydrophobic catalysts, and used a small semi batch reactor to evaluate. The LPCE was evaluated in a reactor shown in Figure 6 [1b] . The reaction main body was a cylindrical glass reactor, placing the prepared superhydrophobic catalysts on the reactor cover plate, the area of superhydrophobic catalysts was about 11.34 cm 2 .…”

Section: Methodsmentioning

confidence: 99%

“…The concentration of HD in hydrogen at the outlet was analyzed by the online Agilent 7890 A GC with a GS‐Carbon PLOT capillary column and a thermal conductivity detector. The over deuterium in the liquid‐phase is exchanged by hydrogen into the gas phase following two steps: gas‐liquid mass transfer (eq 1 and catalytic exchange in (eq 2 [1b,9b]

true {HDO (normalL) + normalH}_{2} O (G) \overset{⇀}{↽} {HDO (normalG) + normalH}_{2} O (L)

true {HDO (normalG) + normalH}_{2} (G) \overset{⇀}{↽} {HD (normalG) + normalH}_{2} O (G)

…”

Section: Methodsmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

true {HDO (normalL) + normalH}_{2} O (G) \overset{⇀}{↽} {HDO (normalG) + normalH}_{2} O (L)

true {HDO (normalG) + normalH}_{2} (G) \overset{⇀}{↽} {HD (normalG) + normalH}_{2} O (G)

…”

Section: Methodsmentioning

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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“…The LPCE was evaluated in a reactor shown in Scheme 1. 1 First, 80 mg of catalysts was coated on the surface of the reactor by Cao's method. 25 The detailed preparation process is described in the Supporting Information.…”

Section: Methodsmentioning

confidence: 99%

“…Upgrading of recycled water from a nuclear power station usually contains low abundances of deuterium (D) and radioactive tritium (T), which are needed to separate these hydrogen isotopes and decrease their toxicity. − In general, separation technologies include physical processes such as distillation and thermal diffusion and chemical reactions like catalytic exchange. As one of the catalytic exchange technologies, liquid-phase catalytic exchange (LPCE) has attracted much attention because of mild operating conditions, low energy consumption, and high separation efficiency. − …”

Section: Introductionmentioning

confidence: 99%

“…Taking hydrogen–deuterated water, including HDO and H 2 O, as an example, the deuterium in the liquid-phase is exchanged by hydrogen into the gas phase through two steps: gas-liquid mass transfer (eq ) and catalytic exchange in (eq ) , The above two processes are dominated by humidity of HDO in the gas phase and the rate of the catalytic exchange to accelerate the reaction approaching equilibrium, which needs to be overcome by using highly efficient catalysts. Usually, platinum is regarded as an efficient catalyst for LPCE .…”

Section: Introductionmentioning

confidence: 99%

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Liquid-Phase Catalytic Exchange of Hydrogen Isotopes over Platinum on Dual-Modified Graphene

Feng

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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Although liquid-phase catalytic exchange is an environmentally friendly treatment of hydrogen isotopes in recycled water of a nuclear power station, the successive development of hydrophobic catalysts is still needed to meet much higher catalytic exchange efficiency and stability. Herein, a dual-modified graphene with Pt loading was designed by amination and silanization to anchor Pt nanoparticles uniformly, as well as obtain higher hydrophobicity. After coating the reactor walls with poly(dimethylsiloxane), the catalytic exchange efficiency of the dual-modified graphene with lower Pt loadings (Pt/200-S-NH2-GR) improved up to 91% at 80 °C, which was higher than 80% of only animated graphene (Pt/NH2-GR) at the same condition. Furthermore, the Pt/200-S-NH2-GR maintained high stability for at least 10 h in the temperature range of 40–80 °C, while the Pt/NH2-GR decreased 17% of catalytic exchange efficiency at 80 °C within 10 h. Using the dual-modified strategy for graphene support, high efficiency and stability was achieved for heavy water dedeuteration.

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Lithium Fluoride Enhanced Platinum Catalytic Exchange of Hydrogen Isotopes by High Hydrogen Adsorption at Low Temperature

Liu,

Xu,

Ren

et al. 2024

ChemNanoMat

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The catalytic exchange of hydrogen isotopes is a promising technology for purifying recycled water in nuclear power stations. However, it remains a challenge for achieving high catalytic efficiency and stability at low temperatures. In this work, we propose a facile strategy to enhance the catalyst efficiency by introducing LiF in the Pt/Ti3AlC2 (Pt‐5‐LiF/Ti3AlC2). The incorporation of LiF significantly achieves high catalytic exchange efficiency of 92% and a turnover frequency of 28.1 h‐1, which are more than twice that of Pt/Ti3AlC2. The structure‐activity relationship analysis reveals that the introduction of LiF substantially enhanced the hydrogen adsorption capacity of the catalyst and further improved the performance of the catalysts. Moreover, this LiF‐added strategy is also applicable to other Pt‐based catalysts such as Pt/Al2O3 and Pt/activated carbon. This work provides a novel catalyst design strategy for high‐efficiency catalytic exchange of hydrogen isotopes.

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Catalytic exchange of hydrogen isotopes intensified by two-phase stratified flow in wettability designable microchannels

Abstract: Liquid phase catalytic exchange of hydrogen isotopes is intensified by stratified flow in a microchannel reactor coated with hydrophobic Pt/AC/PDMS.

Cited by 10 publications

References 44 publications

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

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

Liquid-Phase Catalytic Exchange of Hydrogen Isotopes over Platinum on Dual-Modified Graphene

Lithium Fluoride Enhanced Platinum Catalytic Exchange of Hydrogen Isotopes by High Hydrogen Adsorption at Low Temperature

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