Direct Synthesis of Conformal Layered Protonated Titanate Nanoarray Coatings on Various Substrate Surfaces Boosted by Low-Temperature Microwave-Assisted Hydrothermal Synthesis

ACS Applied Materials & Interfaces
Xingxu LuPu-Xian Gao

Abstract

Layered protonated titanates (LPTs) are promising support materials for catalytic applications because their high surface area and cation exchange capacity provide the possibility of achieving a high metal dispersion. However, the reported LPT nanomaterials are mainly limited to free-standing nanoparticles (NPs) and usually require high temperature and pressure conditions with extended reaction time. In this work, a high-throughput microwave-assisted hydrothermal method was developed for the direct synthesis of conformal LPT nanoarray coatings onto the three-dimensional honeycomb monoliths as well as other substrate surfaces at low temperature (75-95 °C) and pressure (1 atm). Using TiCl3 as the titanium source, H2O2 as the oxidant, and hydrochloric acid as the pH controller, a peroxotitanium complex (PTC) was formed and identified to play an essential role for the formation of LPT nanoarrays. The gaseous O2 released during the decomposition of PTC promotes the mass transfer of the precursors, making this method applicable to substrates with complex geometries. With the optimized conditions, a growth rate of 42 nm/min was achieved on cordierite monolith substrates. When loaded with Pt NPs, the LPT nanoarray-based monolithic cata...Continue Reading

References

Mar 3, 2006·The Journal of Physical Chemistry. B·Yury V Kolen'koMasahiro Yoshimura
Jan 16, 2009·Inorganic Chemistry·Tao GaoPoul Norby
May 7, 2010·Chemistry, an Asian Journal·Bin ZhaoJinlong Zhang
Jun 10, 2011·Chemical Communications : Chem Comm·Narottam SutradharAsit Baran Panda
Mar 17, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Chen ZouYan Xu

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