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• W1971891299 abstract "Thermal decomposition of PtCl6-exchanged hydrotalcite-like Mg0.74Al0.26(OH)2(NO3)0.26·0.36H2O (Pt−HT) in a stream of H2 has been investigated to demonstrate the catalytic role of intercalated Pt on the transformation to porous structures. Platinum species in the interlayer promoted the reaction between H2 and interlayer nitrate (NO3-) to yield N2 so as to give rise to a large surface area (≥200 m2 g-1) solid at as low as ca. 200 °C, compared to 400 °C required for the pristine HT. The XAFS analysis of the PtCl6-exchanged HT gave evidence that part of chloride (Cl-) ligands bound to Pt was replaced by NO3- during an exchange process. Since molecular hydrogen is activated by Pt, the reaction of nitrate ligand with hydrogen to form N2/H2O should generate a vacant site, which is successively occupied by NO3- ions lying in the interlayer. Such coordination/catalytic reduction cycles would accelerate the removal of NO3- surrounding Pt in the interlayer before dehydroxylation of brucite layers. This is in contrast to the pristine HT, where the release of NO3- as NO and dehydroxylation occurred simultaneously at ≥400 °C. Consequently, N2 adsorption/desorption isotherms showed the two-dimensional pore structure of Pt−HT in contrast to the three-dimensional pores of the pristine HT after thermal decomposition." @default.
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• W1971891299 date "2005-08-24" @default.
• W1971891299 modified "2023-10-07" @default.
• W1971891299 title "Catalytic Role of Intercalated Pt Complex in Thermal Decomposition of Nitrate-Type Hydrotalcite to Porous Structure" @default.
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• W1971891299 doi "https://doi.org/10.1021/cm051087w" @default.
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