Effects of synthesis conditions on MFI zeolite membrane quality and catalytic cracking deposition modification results

Haibing Wang, Y. S. Lin

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

MFI zeolite membranes were synthesized by the templated in-situ synthesis method on α-alumina porous supports under various conditions and subsequently modified by catalytic cracking deposition (CCD) of methyldiethoxysilane (MDES) to improve high temperature H2/CO 2 separation performance. The quality of the zeolite membranes was examined by helium permeation (before template removal) and room temperature H2/CO2 separation (after template removal). For membranes prepared through single hydrothermal synthesis, the helium permeance decreases and the room temperature H2/CO2 separation factor increases with increasing synthesis time (or membrane thickness). Helium flows through the defects of the as-prepared membranes before template removal decreases as membrane thickness increases, but the thicker membranes contain more defects formed during the template removal step. Twice-hydrothermal treatment with calcination in between is effective to improve the quality of MFI zeolite membranes. However, a minimal synthesis time for each hydrothermal cycle is needed to eliminate the intercrystalline defects. Catalytic cracking deposition of MDES improves the high temperature H2/CO2 separation performance of the MFI zeolite membranes and the extent of the improvements is directly correlated with the membrane synthesis conditions. After CCD modification, the H2/CO2 separation factor of the membrane synthesized twice with 4 h for each hydrothermal cycle was improved from 4.2 to 8.6 with around 40% reduction in H2 permeance.

Original languageEnglish (US)
Pages (from-to)481-488
Number of pages8
JournalMicroporous and Mesoporous Materials
Volume142
Issue number2-3
DOIs
StatePublished - Jul 2011

Fingerprint

Zeolites
Catalytic cracking
membranes
Membranes
synthesis
Helium
templates
helium
Defects
defects
Temperature
cycles
Aluminum Oxide
Hydrothermal synthesis
room temperature
Carbon Monoxide
Permeation
Calcination
roasting
Alumina

Keywords

  • Catalytic cracking deposition (CCD)
  • H/CO separation factor
  • In-situ hydrothermal synthesis
  • Intercrystalline defects
  • MFI zeolite membranes

ASJC Scopus subject areas

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

Cite this

Effects of synthesis conditions on MFI zeolite membrane quality and catalytic cracking deposition modification results. / Wang, Haibing; Lin, Y. S.

In: Microporous and Mesoporous Materials, Vol. 142, No. 2-3, 07.2011, p. 481-488.

Research output: Contribution to journalArticle

@article{1e162194e9164a2b885f424c7fda9c45,
title = "Effects of synthesis conditions on MFI zeolite membrane quality and catalytic cracking deposition modification results",
abstract = "MFI zeolite membranes were synthesized by the templated in-situ synthesis method on α-alumina porous supports under various conditions and subsequently modified by catalytic cracking deposition (CCD) of methyldiethoxysilane (MDES) to improve high temperature H2/CO 2 separation performance. The quality of the zeolite membranes was examined by helium permeation (before template removal) and room temperature H2/CO2 separation (after template removal). For membranes prepared through single hydrothermal synthesis, the helium permeance decreases and the room temperature H2/CO2 separation factor increases with increasing synthesis time (or membrane thickness). Helium flows through the defects of the as-prepared membranes before template removal decreases as membrane thickness increases, but the thicker membranes contain more defects formed during the template removal step. Twice-hydrothermal treatment with calcination in between is effective to improve the quality of MFI zeolite membranes. However, a minimal synthesis time for each hydrothermal cycle is needed to eliminate the intercrystalline defects. Catalytic cracking deposition of MDES improves the high temperature H2/CO2 separation performance of the MFI zeolite membranes and the extent of the improvements is directly correlated with the membrane synthesis conditions. After CCD modification, the H2/CO2 separation factor of the membrane synthesized twice with 4 h for each hydrothermal cycle was improved from 4.2 to 8.6 with around 40{\%} reduction in H2 permeance.",
keywords = "Catalytic cracking deposition (CCD), H/CO separation factor, In-situ hydrothermal synthesis, Intercrystalline defects, MFI zeolite membranes",
author = "Haibing Wang and Lin, {Y. S.}",
year = "2011",
month = "7",
doi = "10.1016/j.micromeso.2010.12.037",
language = "English (US)",
volume = "142",
pages = "481--488",
journal = "Microporous and Mesoporous Materials",
issn = "1387-1811",
publisher = "Elsevier",
number = "2-3",

}

TY - JOUR

T1 - Effects of synthesis conditions on MFI zeolite membrane quality and catalytic cracking deposition modification results

AU - Wang, Haibing

AU - Lin, Y. S.

PY - 2011/7

Y1 - 2011/7

N2 - MFI zeolite membranes were synthesized by the templated in-situ synthesis method on α-alumina porous supports under various conditions and subsequently modified by catalytic cracking deposition (CCD) of methyldiethoxysilane (MDES) to improve high temperature H2/CO 2 separation performance. The quality of the zeolite membranes was examined by helium permeation (before template removal) and room temperature H2/CO2 separation (after template removal). For membranes prepared through single hydrothermal synthesis, the helium permeance decreases and the room temperature H2/CO2 separation factor increases with increasing synthesis time (or membrane thickness). Helium flows through the defects of the as-prepared membranes before template removal decreases as membrane thickness increases, but the thicker membranes contain more defects formed during the template removal step. Twice-hydrothermal treatment with calcination in between is effective to improve the quality of MFI zeolite membranes. However, a minimal synthesis time for each hydrothermal cycle is needed to eliminate the intercrystalline defects. Catalytic cracking deposition of MDES improves the high temperature H2/CO2 separation performance of the MFI zeolite membranes and the extent of the improvements is directly correlated with the membrane synthesis conditions. After CCD modification, the H2/CO2 separation factor of the membrane synthesized twice with 4 h for each hydrothermal cycle was improved from 4.2 to 8.6 with around 40% reduction in H2 permeance.

AB - MFI zeolite membranes were synthesized by the templated in-situ synthesis method on α-alumina porous supports under various conditions and subsequently modified by catalytic cracking deposition (CCD) of methyldiethoxysilane (MDES) to improve high temperature H2/CO 2 separation performance. The quality of the zeolite membranes was examined by helium permeation (before template removal) and room temperature H2/CO2 separation (after template removal). For membranes prepared through single hydrothermal synthesis, the helium permeance decreases and the room temperature H2/CO2 separation factor increases with increasing synthesis time (or membrane thickness). Helium flows through the defects of the as-prepared membranes before template removal decreases as membrane thickness increases, but the thicker membranes contain more defects formed during the template removal step. Twice-hydrothermal treatment with calcination in between is effective to improve the quality of MFI zeolite membranes. However, a minimal synthesis time for each hydrothermal cycle is needed to eliminate the intercrystalline defects. Catalytic cracking deposition of MDES improves the high temperature H2/CO2 separation performance of the MFI zeolite membranes and the extent of the improvements is directly correlated with the membrane synthesis conditions. After CCD modification, the H2/CO2 separation factor of the membrane synthesized twice with 4 h for each hydrothermal cycle was improved from 4.2 to 8.6 with around 40% reduction in H2 permeance.

KW - Catalytic cracking deposition (CCD)

KW - H/CO separation factor

KW - In-situ hydrothermal synthesis

KW - Intercrystalline defects

KW - MFI zeolite membranes

UR - http://www.scopus.com/inward/record.url?scp=79954419547&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79954419547&partnerID=8YFLogxK

U2 - 10.1016/j.micromeso.2010.12.037

DO - 10.1016/j.micromeso.2010.12.037

M3 - Article

AN - SCOPUS:79954419547

VL - 142

SP - 481

EP - 488

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

SN - 1387-1811

IS - 2-3

ER -