Generation and extraction of hydrogen from low-temperature water-gas-shift reaction by a ZIF-8-based membrane reactor

Hang Yin, Jin Shang, Jungkyu Choi, Alex C.K. Yip

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this study, for the first time, a membrane reactor (MR) was constructed with a crystalline metal-organic framework (MOF) membrane and Cu/Zn/Al 2 O 3 catalysts, and utilized for hydrogen production and purification through a low-temperature water gas shift reaction (LT-WGSR). Compared with the existing metal and zeolite membranes, the as-synthesized zeolitic imidazolate framework-8 (ZIF-8) membrane showed a pure hydrogen permeance of 9.2 × 10 −7 mol/m 2 s Pa, which is orders of magnitude higher than those of metal membranes, and a considerable H 2 /CO ideal selectivity of 6.13 at room temperature without any post-treatment, making it a more practical option for producing hydrogen with a MR process from a WGSR from the perspectives of productivity and scalability. Significantly enhanced CO conversions and hydrogen purities were achieved when the LT-WGSR was conducted in this ZIF-8-based MR system compared to those achieved with traditional packed-bed reactors (PBRs) under the operating conditions of interest in the present study, i.e. temperature of 120–220 °C and space velocity of 20–80 L/g·h. An improvement of ∼13.5% in the CO conversion was achieved with the MR at 220 °C and a space velocity of 80 L (STP)/g-cat·h, whereas a higher temperature and lower space velocity favoured a higher H 2 recovery. The feasibility of using this ZIF-8-based MR for long-term LT-WGSRs was assessed; the structural stability of the ZIF-8 membrane must be enhanced to achieve a ZIF-8-based MR in the future.

Original languageEnglish
Pages (from-to)347-356
Number of pages10
JournalMicroporous and Mesoporous Materials
Volume280
DOIs
Publication statusPublished - 2019 May 15

Fingerprint

Water gas shift
Hydrogen
reactors
membranes
Membranes
shift
hydrogen
gases
water
Temperature
Carbon Monoxide
Metals
metals
Zeolites
structural stability
Packed beds
hydrogen production
Hydrogen production
productivity
purification

Keywords

  • Hydrogen production and purification
  • Membrane reactor
  • Water-gas-shift reaction
  • ZIF-8 membrane

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

Generation and extraction of hydrogen from low-temperature water-gas-shift reaction by a ZIF-8-based membrane reactor. / Yin, Hang; Shang, Jin; Choi, Jungkyu; Yip, Alex C.K.

In: Microporous and Mesoporous Materials, Vol. 280, 15.05.2019, p. 347-356.

Research output: Contribution to journalArticle

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AB - In this study, for the first time, a membrane reactor (MR) was constructed with a crystalline metal-organic framework (MOF) membrane and Cu/Zn/Al 2 O 3 catalysts, and utilized for hydrogen production and purification through a low-temperature water gas shift reaction (LT-WGSR). Compared with the existing metal and zeolite membranes, the as-synthesized zeolitic imidazolate framework-8 (ZIF-8) membrane showed a pure hydrogen permeance of 9.2 × 10 −7 mol/m 2 s Pa, which is orders of magnitude higher than those of metal membranes, and a considerable H 2 /CO ideal selectivity of 6.13 at room temperature without any post-treatment, making it a more practical option for producing hydrogen with a MR process from a WGSR from the perspectives of productivity and scalability. Significantly enhanced CO conversions and hydrogen purities were achieved when the LT-WGSR was conducted in this ZIF-8-based MR system compared to those achieved with traditional packed-bed reactors (PBRs) under the operating conditions of interest in the present study, i.e. temperature of 120–220 °C and space velocity of 20–80 L/g·h. An improvement of ∼13.5% in the CO conversion was achieved with the MR at 220 °C and a space velocity of 80 L (STP)/g-cat·h, whereas a higher temperature and lower space velocity favoured a higher H 2 recovery. The feasibility of using this ZIF-8-based MR for long-term LT-WGSRs was assessed; the structural stability of the ZIF-8 membrane must be enhanced to achieve a ZIF-8-based MR in the future.

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