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Positron annihilation spectroscopic investigation of Al-pillared montmorillonites

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Abstract

We report, for the first time, our result on characterisation of Al-pillared clay using positron annihilation spectroscopy (PAS) along with XRD and BET techniques. Positron life-time spectra for Al-pillared montmorillonite, as received and calcined at different temperature (100–500°C), along with the parent natural clay are measured. The annihilation rate of ortho-positronium (o-Ps) increases monotonically with calcination temperature up to 300°C and falls subsequently. Similar behaviour is seen for the fraction of o-Ps formed. We interpret the initial rise in annihilation rate of o-Ps to be due to the increase in Brønsted acidity with dehydroxylation of pillars. The reduction in annihilation rate on calcination at higher temperatures could be due to loss of acidity and/or due to mesopore formation following delamination of clay structure.

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Authors and Affiliations

  1. Chemical Engineering Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India

    J.M. Joshi & S. Srisaila

  2. Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India

    H.S. Sodaye, P.K. Pujari & M.B. Bajpai

Authors
  1. J.M. Joshi
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  2. H.S. Sodaye
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  3. P.K. Pujari
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  4. S. Srisaila
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  5. M.B. Bajpai
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Joshi, J., Sodaye, H., Pujari, P. et al. Positron annihilation spectroscopic investigation of Al-pillared montmorillonites. Catalysis Letters 51, 109–112 (1998). https://doi.org/10.1023/A:1019093202950

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