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A Single‐Stage Water–Gas Shift Reaction over Highly Active and Stable Si‐ and Al‐Substituted Pt/CeO 2 Catalysts
Author(s) -
Shinde Vijay M.,
Madras Giridhar
Publication year - 2012
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201200363
Subject(s) - catalysis , water gas shift reaction , x ray photoelectron spectroscopy , oxygen , dissociation (chemistry) , chemistry , hydrogen , nuclear chemistry , atmospheric temperature range , inorganic chemistry , materials science , chemical engineering , biochemistry , organic chemistry , engineering , physics , meteorology
Ce 0.88 Si 0.1 Pt 0.02 O 2− δ and Ce 0.88 Al 0.1 Pt 0.02 O 2− δ catalysts were synthesized by using a low‐temperature sonochemical method and characterized by using XRD, TEM, XPS, FTIR, and BET surface analyzer. The catalytic activities of these compounds were investigated for the water–gas shift reaction in the temperature range of 140–440 °C. The substitution of Si in Ce 0.98 Pt 0.02 O 2− δ increased the releasing capacity of lattice oxygen, whereas the substitution of Al decreased the reducibility of Ce 0.98 Pt 0.02 O 2− δ , as evidenced by hydrogen temperature‐programmed reduction studies. However, both the catalysts showed a considerable improvement in terms of activity and stability compared to Ce 0.98 Pt 0.02 O 2− δ . The combined activity measurement and characterization results suggest that the increase in the oxygen vacancy, which acts as a dissociation center for water, is the primary reason for the improvement in the activity of modified Ce 0.98 Pt 0.02 O 2− δ . Both the catalysts are 100 % selective toward H 2 production, and approximately 99 % conversion of CO to CO 2 was observed at 260 and 270 °C for Ce 0.88 Si 0.1 Pt 0.02 O 2− δ and Ce 0.88 Al 0.1 Pt 0.02 O 2− δ , respectively. These catalysts do not deactivate during the daily startup/shutdown operations and are sustainable even after prolonged reaction. Notably, these catalysts do not require any pretreatment or activation during startup/shutdown operations.