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Mesoporous silica beads encapsulated with functionalized palladium nanocrystallites: Novel catalyst for selective hydrogen evolution

Published online by Cambridge University Press:  15 June 2017

Prem Chandra Pandey Open the ORCID record for Prem Chandra Pandey [Opens in a new window] ,
Shubhangi Shukla  and
Yashashwa Pandey
Prem Chandra Pandey*
Affiliation:
Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, India
Shubhangi Shukla
Affiliation:
Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, India
Yashashwa Pandey
Affiliation:
Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, India
*
a) Address all correspondence to this author. e-mail: pcpandey.apc@iitbhu.ac.in
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Abstract

2-(3,4 epoxycyclohexyl)ethyltrimethoxysilane (EETMS)/3-glycidoxypropyltrimethoxysilane (GPTMS) mediated, in situ synthesis of functional palladium (Pd) nanocomposites over the graphene oxide (GO) surface is reported. The prepared nanocomposites viz, Pd/EETMS, Pd/GPTMS, Pd/GO/EETMS, and Pd/GO/GPTMS, are encapsulated into mesoporous (2–10 nm) silica-alginate beads to primarily serve the development of cost-effective catalyst for on-board generation of hydrogen. Major findings involve: (i) the synthesis of porous silica alginate beads, with the controlled pore sizes (2–10 nm) as a function of concentration of alkoxysilanes, (ii) onboard release of hydrogen from the decomposition of hydrazine, which is evaluated as: (1) time-dependent disappearance of the N–N bond stretching band at 1069 cm−1 based on the FTIR spectroscopy, (2) volumetric estimation of the equimolar hydrogen using methylene blue (MB); (3) catalytic reduction of p-nitroaniline (PNA). The decomposition of high concentration of hydrazine is made possible using very low concentration of palladium. On calcination the efficiency of catalysts found to enhance further. The noteworthy finding is probing the hydrogen evolution using FTIR spectroscopy. Hydrogen selectivity of ∼100% is obtained from the most efficient catalyst (Pd/GO/EETMS-623 K).

Keywords

mesoporoussilica-alginate beadsencapsulationhydrazinehydrogen evolution
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 18 , 28 September 2017 , pp. 3574 - 3584
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Xiaobo Chen

References

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