Stability of MCM-48 in aqueous solution as a function of pH

A. Doyle; B. K. Hodnett

doi:10.1016/S1387-1811(03)00431-1

Stability of MCM-48 in aqueous solution as a function of pH

A. Doyle
, B. K. Hodnett

Retired Staff

University of Limerick

Research output: Contribution to journal › Article › peer-review

Abstract

The stability of MCM-48 was investigated as a function of pH. The material was treated with aqueous solutions of varying pH and the stability was determined by comparison with the untreated MCM-48. In acidic conditions of pH<5.4, the MCM-48 structure was stable and the BET surface area remained high (>1000 m²g^-1), while the mean pore diameter decreased by approximately 20%. In neutral conditions, this phase was completely removed, characterised by the absence of an X-ray diffraction pattern and a dramatic reduction in surface area to 450 m²g^-1 at pH 6.9. Treatment at pH 9.1 caused a transformation to a poorly ordered material, while further increased basic conditions caused significant structural collapse.

Original language	English
Pages (from-to)	53-57
Number of pages	5
Journal	Microporous and Mesoporous Materials
Volume	63
Issue number	1-3
DOIs	https://doi.org/10.1016/S1387-1811(03)00431-1
Publication status	Published - 18 Sep 2003

Keywords

Aqueous stability
MCM-48
Mesoporous
PH

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10.1016/S1387-1811(03)00431-1

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title = "Stability of MCM-48 in aqueous solution as a function of pH",

abstract = "The stability of MCM-48 was investigated as a function of pH. The material was treated with aqueous solutions of varying pH and the stability was determined by comparison with the untreated MCM-48. In acidic conditions of pH<5.4, the MCM-48 structure was stable and the BET surface area remained high (>1000 m2g-1), while the mean pore diameter decreased by approximately 20\%. In neutral conditions, this phase was completely removed, characterised by the absence of an X-ray diffraction pattern and a dramatic reduction in surface area to 450 m2g-1 at pH 6.9. Treatment at pH 9.1 caused a transformation to a poorly ordered material, while further increased basic conditions caused significant structural collapse.",

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AU - Doyle, A.

AU - Hodnett, B. K.

PY - 2003/9/18

Y1 - 2003/9/18

N2 - The stability of MCM-48 was investigated as a function of pH. The material was treated with aqueous solutions of varying pH and the stability was determined by comparison with the untreated MCM-48. In acidic conditions of pH<5.4, the MCM-48 structure was stable and the BET surface area remained high (>1000 m2g-1), while the mean pore diameter decreased by approximately 20%. In neutral conditions, this phase was completely removed, characterised by the absence of an X-ray diffraction pattern and a dramatic reduction in surface area to 450 m2g-1 at pH 6.9. Treatment at pH 9.1 caused a transformation to a poorly ordered material, while further increased basic conditions caused significant structural collapse.

AB - The stability of MCM-48 was investigated as a function of pH. The material was treated with aqueous solutions of varying pH and the stability was determined by comparison with the untreated MCM-48. In acidic conditions of pH<5.4, the MCM-48 structure was stable and the BET surface area remained high (>1000 m2g-1), while the mean pore diameter decreased by approximately 20%. In neutral conditions, this phase was completely removed, characterised by the absence of an X-ray diffraction pattern and a dramatic reduction in surface area to 450 m2g-1 at pH 6.9. Treatment at pH 9.1 caused a transformation to a poorly ordered material, while further increased basic conditions caused significant structural collapse.

KW - Aqueous stability

KW - MCM-48

KW - Mesoporous

KW - PH

UR - https://www.scopus.com/pages/publications/0141563866

U2 - 10.1016/S1387-1811(03)00431-1

DO - 10.1016/S1387-1811(03)00431-1

M3 - Article

AN - SCOPUS:0141563866

SN - 1387-1811

VL - 63

SP - 53

EP - 57

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

IS - 1-3

ER -

Stability of MCM-48 in aqueous solution as a function of pH

Abstract

Keywords

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