Pd/TiO2 catalysts prepared by electroless deposition with and without SnCl2 sensitization for the liquid-phase hydrogenation of 3-hexyn-1-ol. Sittikun, J., Boonyongmaneerat, Y., Weerachawanasak, P., Praserthdam, P., & Panpranot, J. Reaction Kinetics Mechanisms and Catalysis, 111(1):123–135, February, 2014. WOS:000330840000009
doi  abstract   bibtex   
Pd/TiO2 catalysts were prepared by the electroless deposition method with and without SnCl2 sensitization and employed in the liquid-phase selective hydrogenation of 3-hexyn-1-ol under mild conditions (40 A degrees C, H-2 0.2 MPa). As revealed by inductively coupled plasma optical emission spectroscopy, transmission electron microscopy, and CO pulse chemisorption, the use of conventional SnCl2/PdCl2 solution resulted in a larger amount of Pd being deposited (0.98 wt% Pd) on the TiO2 and higher Pd dispersion (6.6 x 10(17) molecules CO/g Pd) than the SnCl2-free activation (0.87 wt% Pd, 5.3 x 10(17) molecules CO/g Pd). However, tin was found to remain on the catalyst in the form of Sn4+ and partially covered the Pd surface. Large Pd particles were formed after electroless plating of Pd when the TiO2 was activated by PdCl2 followed by the reduction using NaH2PO2 (SnCl2-free process). The selectivity towards cis-hexen-1-ol after complete conversion of 3-hexyne-1-ol was much improved using the electroless deposition catalysts (selectivity 60-87 %) compared to the ones prepared by conventional impregnation method (selectivity 4 %). The results in this study show the advantages of electroless deposition technique as a simple methodology to synthesize highly selective catalysts for the production of cis-alkene in the alkynes semihydrogenation.
@article{sittikun_pd/tio2_2014,
	title = {Pd/{TiO2} catalysts prepared by electroless deposition with and without {SnCl2} sensitization for the liquid-phase hydrogenation of 3-hexyn-1-ol},
	volume = {111},
	issn = {1878-5190},
	doi = {10.1007/s11144-013-0634-6},
	abstract = {Pd/TiO2 catalysts were prepared by the electroless deposition method with and without SnCl2 sensitization and employed in the liquid-phase selective hydrogenation of 3-hexyn-1-ol under mild conditions (40 A degrees C, H-2 0.2 MPa). As revealed by inductively coupled plasma optical emission spectroscopy, transmission electron microscopy, and CO pulse chemisorption, the use of conventional SnCl2/PdCl2 solution resulted in a larger amount of Pd being deposited (0.98 wt\% Pd) on the TiO2 and higher Pd dispersion (6.6 x 10(17) molecules CO/g Pd) than the SnCl2-free activation (0.87 wt\% Pd, 5.3 x 10(17) molecules CO/g Pd). However, tin was found to remain on the catalyst in the form of Sn4+ and partially covered the Pd surface. Large Pd particles were formed after electroless plating of Pd when the TiO2 was activated by PdCl2 followed by the reduction using NaH2PO2 (SnCl2-free process). The selectivity towards cis-hexen-1-ol after complete conversion of 3-hexyne-1-ol was much improved using the electroless deposition catalysts (selectivity 60-87 \%) compared to the ones prepared by conventional impregnation method (selectivity 4 \%). The results in this study show the advantages of electroless deposition technique as a simple methodology to synthesize highly selective catalysts for the production of cis-alkene in the alkynes semihydrogenation.},
	language = {English},
	number = {1},
	journal = {Reaction Kinetics Mechanisms and Catalysis},
	author = {Sittikun, Jarutphon and Boonyongmaneerat, Yuttanant and Weerachawanasak, Patcharaporn and Praserthdam, Piyasan and Panpranot, Joongjai},
	month = feb,
	year = {2014},
	note = {WOS:000330840000009},
	keywords = {3-hexyn-1-ol, Electroless deposition, Pd   catalyst, Selective hydrogenation, Sn sensitization, acetylene, activation process, alkyne   hydrogenations, metal-support interaction, morphology, particles, pd/sio2, semihydrogenation, silicon},
	pages = {123--135},
}

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