Mg–Al hydrotalcite-supported Pd catalyst for low-temperature CO oxidation: effect of Pdn+ species and surface hydroxyl groups. Issue 42 (12th September 2018)

• Record Type: Journal Article
• Authors: Lin, Xingyi; Zhou, Jianke; Fan, Yanyu; Zhan, Yingying; Chen, Chongqi; Li, Dalin; Jiang, Lilong
• Is Part Of: Dalton transactions. Volume 47:Issue 42(2018)
• Page Start: 14938
• Page End: 14944
• Publication Date: 2018-09-12
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt03012j
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : HTlcs is demonstrated as an alternative support for Pd-based catalyst in low temperature CO oxidation due to its unique characteristics. Abstract : Hydrotalcite-like compounds (HTlcs) are promising supports or catalyst precursors for heterogeneous catalysts. Herein, MgAl-HTlcs-supported Pd catalyst was fabricated, and two Pd catalysts supported on Mg(OH)2 and Al(OH)3 were prepared for comparison. The presence of hydroxyl groups (OH − ) in the support is important for obtaining uniform Pd nanoparticles with small sizes. We found that Pd n + species are more active than Pd 0 in low temperature CO oxidation due to their lower barrier in CO activation. The Pd/MgAl-HT catalyst shows the most stable Pd n + at a temperature lower than 90 °C, leading to the highest catalytic activity towards CO oxidation. Pd n + in the Pd/Al(OH)3 catalyst is more stable than that in Pd/Mg(OH)2 at low temperature, which is ascribed to its smaller temperature hysteresis ( T hysteresis ) between the oxidation and re-reduction cycles. The effect of hydroxyl groups on stabilizing Pd species is related to the stability of Pd catalyst in CO oxidation reaction.