Evaluation of Activation Energies for Pairwise and Non-Pairwise Hydrogen Addition to Propyne Over Pd/Aluminosilicate Fiberglass Catalyst by Parahydrogen-Induced Polarization (PHIP)

• Published in: Applied magnetic resonance 2014-10, Vol.45 (10), p.1051-1061
• Main Authors: Salnikov, Oleg G., Barskiy, Danila A., Burueva, Dudari B., Gulyaeva, Yulia K., Balzhinimaev, Bair S., Kovtunov, Kirill V., Koptyug, Igor V.
• Format: Article
• Language: English
• Subjects: Activation energy; Aluminosilicates; Aluminum silicates; Aqueous solutions; Atoms and Molecules in Strong Fields; Catalysts; Experiments; Fiberglass; Gases; Hydrogen; Hydrogenation; Induced polarization; Laser Matter Interaction; Magnetic resonance imaging; Nanoparticles; NMR; Nuclear magnetic resonance; Nuclear reactors; Organic Chemistry; Oxidation; Physical Chemistry; Physics; Physics and Astronomy; Solid State Physics; Spectroscopy/Spectrometry; Temperature; VOCs; Volatile organic compounds
• ISSN: 0937-9347; 1613-7507
• DOI: 10.1007/s00723-014-0586-7

Hydrogenation of propyne to propene over Pd/aluminosilicate fiberglass catalyst in the temperature range 175–350 °C was investigated with the use of parahydrogen-induced polarization (PHIP) technique. Activation energies for both pairwise and non-pairwise H 2 addition routes were estimated. It was found that at 175–275 °C the activation energies for hydrogen addition to the triple bond of propyne have similar values (about 60–70 kJ/mol) for both routes of hydrogen addition. At higher temperatures (275–350 °C), the rate constant for pairwise hydrogen addition reaches a maximum value while the rate constant for non-pairwise hydrogen addition continues to increase with increasing temperature.