Fabrication of Pd-Nb bimetallic doped organosilica membranes by different metal doping routes for H<sub>2</sub>/CO<sub>2</sub> separation

Hengfei Zhang; Yibin Wei; Shufeng Niu; Hong Qi

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Fabrication of Pd-Nb bimetallic doped organosilica membranes by different metal doping routes for H₂/CO₂ separation

Separation Science and Engineering | Updated：2026-01-06

- Fabrication of Pd-Nb bimetallic doped organosilica membranes by different metal doping routes for H₂/CO₂ separation
- Chinese Journal of Chemical Engineering Vol. 36, Issue 8, Pages: 67-75(2021)
- Affiliations：
  
  1. State Key Laboratory of Material-Oriented Chemical Engineering, Membrane Science and Technology Research Center, Nanjing Tech University,Nanjing,China,210009
  2. Hongyi Ceramic Membranes Research Institute, Nanjing Hongyi Ceramic Nanofiltration Membranes Co., Ltd.,Nanjing,China,210009
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2021
- Accepted：
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DOI：

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摘要

Abstract

Monometallic doping has proved its superiority in improving either permselectivity or H

permeability of organosilica membranes for H

/CO

separation

but it is still challenging to break the trade-off effect. Herein

we report a series of Pd-Nb bimetallic doped 1

2-bis(triethoxysilyl)ethane (Pd-Nb-BTESE

PNB) membranes with different metal doping routes for simultaneously improving H

permeance and H

/CO

permselectivity by the synergetic effects of Pd and Nb. The doped Pd can exist in the BTESE network as nanoparticles while the doped Nb is incorporated into BTESE network forming Nb-O-Si covalent bonds. The metal doping routes significantly influence the microstructure of PNB networks and gas separation performance of the PNB membranes. We found that the PNB membrane with Pd doping priority (PNB-Pd) exhibited the highest surface area and pore volume

comparing with Nb doping priority (PNB-Nb) or Pd-Nb simultaneous doping (PNB-PdNb). The PNB-Pd membrane could not only exhibit an excellent H

permeance of ~10

-6

mol·m

-2

·s

-1

·Pa

-1

but a

lso a high H

/CO

permselectivity of 17.2. Our findings may provide novel insights into preparation of bimetallic doped organosilica membranes with excellent H

/CO

separation performance.

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Fabrication of Pd-Nb bimetallic doped organosilica membranes by different metal doping routes for H2/CO2 separation

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摘要

Abstract

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Keywords

references

Fabrication of Pd-Nb bimetallic doped organosilica membranes by different metal doping routes for H₂/CO₂ separation