TY - JOUR
T1 - Selective hydrogenation of acetylene on TiO2-added Pd catalysts
AU - Jung, Hwa Kang
AU - Eun, Woo Shin
AU - Woo, Jae Kim
AU - Jae, Duk Park
AU - Sang, Heup Moon
N1 - Funding Information:
This work was supported by the Research Center for Catalytic Technology at POSTECH, Daelim Industrial Co., Ltd., and Brain Korea 21 project.
PY - 2002
Y1 - 2002
N2 - The performance of TiO2-modified Pd catalysts, containing TiO2 either as an additive or as a support, in the selective hydrogenation of acetylene was investigated using a steady-state reaction test. The catalyst surface was characterized by H2 and CO chemisorption, infrared, X-ray photoelectron spectroscopy (XPS), and the temperature-programmed desorption (TPD) of ethylene. The TiO2-added Pd catalyst reduced at 500°C, denoted in this study Pd-Ti/SiO2/500°C, showed a higher selectivity for ethylene production than either the Pd/TiO2 or Pd/SiO2 catalyst. The amounts of chemisorbed H2 and CO were significantly reduced and, in particular, the adsorption of multiply coordinated CO species was suppressed on Pd-Ti/SiO2/500°C, which is characteristic of the well-known strong-metal-support-interaction (SMSI) phenomenon that has been observed with the TiO2-supported Pd catalyst reduced at 500°C, Pd/TiO2/500°C. XPS analyses of Pd-Ti/SiO2/500°C suggested an electronic modification of Pd by TiO2, and the TPD of ethylene from the catalyst showed the weakening in ethylene adsorption on the Pd surface. 1,3-Butadiene was produced in smaller amounts when using Pd-Ti/SiO2/500°C than when using Pd/SiO2/500°C, indicating that the polymerization of C2 species leading to catalyst deactivation proceeds at slower rates on the former catalyst than on the latter. The enhanced ethylene selectivity on Pd-Ti/SiO2/500°C may be explained by correlating the catalyst surface properties with the mechanism of acetylene hydrogenation.
AB - The performance of TiO2-modified Pd catalysts, containing TiO2 either as an additive or as a support, in the selective hydrogenation of acetylene was investigated using a steady-state reaction test. The catalyst surface was characterized by H2 and CO chemisorption, infrared, X-ray photoelectron spectroscopy (XPS), and the temperature-programmed desorption (TPD) of ethylene. The TiO2-added Pd catalyst reduced at 500°C, denoted in this study Pd-Ti/SiO2/500°C, showed a higher selectivity for ethylene production than either the Pd/TiO2 or Pd/SiO2 catalyst. The amounts of chemisorbed H2 and CO were significantly reduced and, in particular, the adsorption of multiply coordinated CO species was suppressed on Pd-Ti/SiO2/500°C, which is characteristic of the well-known strong-metal-support-interaction (SMSI) phenomenon that has been observed with the TiO2-supported Pd catalyst reduced at 500°C, Pd/TiO2/500°C. XPS analyses of Pd-Ti/SiO2/500°C suggested an electronic modification of Pd by TiO2, and the TPD of ethylene from the catalyst showed the weakening in ethylene adsorption on the Pd surface. 1,3-Butadiene was produced in smaller amounts when using Pd-Ti/SiO2/500°C than when using Pd/SiO2/500°C, indicating that the polymerization of C2 species leading to catalyst deactivation proceeds at slower rates on the former catalyst than on the latter. The enhanced ethylene selectivity on Pd-Ti/SiO2/500°C may be explained by correlating the catalyst surface properties with the mechanism of acetylene hydrogenation.
KW - Acetylene hydrogenation
KW - Ethylene selectivity
KW - Pd
KW - SMSI
KW - TiO
UR - http://www.scopus.com/inward/record.url?scp=0037053733&partnerID=8YFLogxK
U2 - 10.1006/jcat.2002.3583
DO - 10.1006/jcat.2002.3583
M3 - Article
AN - SCOPUS:0037053733
SN - 0021-9517
VL - 208
SP - 310
EP - 320
JO - Journal of Catalysis
JF - Journal of Catalysis
IS - 2
ER -