Activation of Surface Lattice Oxygen in Ceria Supported Pt/Al<sub>2</sub>O<sub>3</sub> Catalyst for Low‐Temperature Propane Oxidation

Wang, Chengxiong; Feng, Feng; Du, Junliang; Zheng, Tingting; Pan, Zhizhong Z.; Zhao, Yaohua

doi:10.1002/cctc.201900190

Cited by 27 publications

(19 citation statements)

References 30 publications

(27 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The T 90 gaps between Pt/Al 2 O 3 and CeO 2 -Pt/Al 2 O 3 catalyst for CO and C 3 H 8 conversions are higher than the corresponding T 50 gaps, reaching 41.2 • C and 92.0 • C, respectively. These results indicate that the ceria addition significantly promotes low-temperature catalytic oxidation of CO, NO, C 3 H 6 and C 3 H 8 , which agree well with the literature [10,13,16,20]. In addition, the CeO 2 -Pt/Al 2 O 3 catalyst showed the lower characteristic temperatures for CO, NO and C 3 H 6 conversion than that of the reference catalyst, although there was no obvious superiority for catalytic oxidation of C 3 H 8 .…”

Section: Catalytic Performancesupporting

confidence: 90%

“…The average sizes of CeO 2 nanoparticles in the CeO 2 /Al 2 O 3 and CeO 2 -Pt/Al 2 O 3 catalysts were 7.0 nm and 4.1 nm, respectively, indicating that the catalytic decomposition of cerium nitrate by Pt δ+ species show a positive impact on promoting the dispersity of ceria. Co-existence of Pt 4+ and Pt 2+ species in Pt/alumina powder using [HOCH 2 CH 2 NH 3 ] 2 Pt(OH) 6 as the Pt-precursor has been confirmed in our previous investigations [10]. The average size of CeO 2 nanoparticles in the reference catalyst was bigger by comparison with the CeO 2 -Pt/Al 2 O 3 catalyst, reaching 5.4 nm.…”

Section: Catalytic Performancesupporting

confidence: 74%

“…The recognized ability of ceria to undergo rapid reduction/oxidation cycles (4CeO 2 2Ce 2 O 3 + O 2 ) plays a significant role in providing oxygen mobility and oxygen storage/release [8]. In our previous investigations, it was reported that the synergy between ceria additive and active Pt species has a positive impact on the stability of coordinately unsaturated Pt 2+ and Pt 4+ species, thereby drives C-C and C-H bonds activation and promotes low-temperature oxidation of propane [10]. Ceria can also stabilize atomically dispersed ionic platinum (Pt 2+ species) to accelerate CO oxidation at low temperature [11].…”

Section: Introductionmentioning

confidence: 99%

“…Some methods for cerium addition into Al 2 O 3 supported catalyst have been reported, for instance, incipient wetness impregnation [10], controlled surface reaction (CSR) technique [18], and atomic layer deposition (ALD) technique [19]. The latter two methods can effectively improve the dispersity of ceria, but the use of expensive organometallics, such as Ce(acac) 3 (cerium acetylacetonate) and Ce(TMHD) 4 (tetrakis(2,2,6,6-tetramethyl-3,5-heptanedionato)cerium) is required to prepare the CeO 2-x /Pt/Al 2 O 3 catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…The latter two methods can effectively improve the dispersity of ceria, but the use of expensive organometallics, such as Ce(acac) 3 (cerium acetylacetonate) and Ce(TMHD) 4 (tetrakis(2,2,6,6-tetramethyl-3,5-heptanedionato)cerium) is required to prepare the CeO 2-x /Pt/Al 2 O 3 catalyst. By contrast, the incipient wetness impregnation method was considered as the most practical method, resulting from requiring the use of low-cost inorganic precursors, such as Ce(NO 3 ) 3 (cerium nitrate) and (NH 4 ) 2 [Ce(NO 3 ) 6 ] (diammonium hexanitrate cerate) [10,20]. The cerium addition by incipient wetness impregnation using Ce(NO 3 ) 3 has been successfully employed to prepare the highly-efficient automotive catalysts [13].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

In Situ Investigations on the Facile Synthesis and Catalytic Performance of CeO2-Pt/Al2O3 Catalyst

Wang

Ren

et al. 2020

Catalysts

Self Cite

View full text Add to dashboard Cite

Ceria-modified Pt/Al2O3 catalyst has been commonly prepared by the impregnation of platinum on ceria-modified alumina and widely applied in the chemical industry and automotive industry. The in situ diffuse reflectance infrared Fourier transformed spectroscopy (DRIFTS), and thermogravimetric (TG) analysis techniques were employed to investigate the typical mechanisms of the bis(ethanolammonium)hexahydroxyplatinate(IV) and cerium nitrate decomposition catalyzed by Ptδ+ species for the facile synthesis of CeO2-Pt/Al2O3 catalyst. It was found that Pt4+-catalyzed decomposition of cerium nitrate leads to the higher dispersity of ceria and forming more active oxygen species, on the basis of X-ray diffraction (XRD) and H2 temperature-programmed reduction (H2-TPR) results. The in situ activity measurements were also performed to investigate the reaction mechanisms and the specific activities for the catalytic CO, NO, C3H6 and C3H8 co-oxidation. The results indicate that undesirable N2O by-product is formed by the selective catalytic reduction (SCR) of NO by C3H6 below 350 °C. The cerium addition effectively improves the activity of catalytic oxidation, but exhibits an increased N2O yield, due to the increased reducibility.

show abstract

Section: Catalytic Performancesupporting

confidence: 90%

Section: Catalytic Performancesupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

In Situ Investigations on the Facile Synthesis and Catalytic Performance of CeO2-Pt/Al2O3 Catalyst

Wang

Ren

et al. 2020

Catalysts

Self Cite

View full text Add to dashboard Cite

show abstract

Thermally Induced Structure and Functionality Evolution of a Pt–based Lean NOx Trap Catalyst

Ren,

Wang,

Yang

et al. 2024

ChemCatChem

View full text Add to dashboard Cite

Applying a NOx trap catalyst to effectively remove NOx contaminants from the oxygen‐rich exhaust is still very challenging, due to the lack of use guidance based on deactivation mechanisms. The temperature‐dependent Pt sintering rate constant was described using Pt dispersion determined by pulse CO chemisorption. It was found that 700‐850 ºC was the determining temperature regions for the significant Pt sintering, according to the sintering kinetics and the evolution of active Ptδ+ sites. The weak basicity plays a critical role in trapping NOx at low‐temperature (≤ 300 ºC), and the NOx trap efficiency decreases because of the loss of catalytic activity and medium basicity caused by forming BaAl2O4 phase. The reduction of NOx towards N2 on the Pt crystallites smaller than 18 nm is structure sensitive and decreases with losing the reducibility of catalysts. The security for long‐time use of a NOx trap catalyst should be exposed to the exhaust gas within 750 ºC, and effectively removing NOx contaminants requires it to be worked in the 350‐500 ºC regions. These findings can guide engineers and applied chemists how to efficiently use a NOx trap catalyst in the automotive exhaust purification system.

show abstract

Promotion of Low‐Temperature Oxidation of Propane through Introduction of Ce into Mullite Oxide YMn₂O₅

et al. 2022

View full text Add to dashboard Cite

A high-surface-area Ce doped mullite YMn 2 O 5 was developed via a facile hydrothermal approach, which exhibited higher catalytic activity with a long thermal stability towards propane oxidation in regards to pristine mullite YMn 2 O 5 . T 90 (the temperature at 90 % conversion of reactant) of propane over the mixed oxides is ~40 °C lower than that over pristine YMn 2 O 5 mullite (147 m 2 /g). The complete oxidation temperature occurs at as low as 225 °C (1000 ppm C 3 H 8 and 10 % O 2 balanced with N 2 , WHSV = 30,000 mL/g h). Notably, the mixed oxides maintain superior catalytic stability at 250 °C for 120 h without noticeable loss in the activity. Fundamentally, the remarkable performance stems from the abundant oxygen defects caused by the lattice mismatch between CeO 2 and YMn 2 O 5 , which is conducive to the gas phase oxygen adsorption and activation, thereby enhancing the low temperature catalytic activity of the material. In addition, the CeO 2 on the catalyst's surface acts as an oxygen reservoir and provides additional adsorption sites for propane to promote the oxidation reaction. In situ DRIFTS results indicates that the dissociation of acrylate could be the key step for propane oxidation since acrylate is more difficult to decompose and desorb than formate and acetate. These findings revealed the roles of ceria on mullite oxides for propane oxidation activity.

show abstract

Activation of Surface Lattice Oxygen in Ceria Supported Pt/Al₂O₃ Catalyst for Low‐Temperature Propane Oxidation

Cited by 27 publications

References 30 publications

In Situ Investigations on the Facile Synthesis and Catalytic Performance of CeO2-Pt/Al2O3 Catalyst

In Situ Investigations on the Facile Synthesis and Catalytic Performance of CeO2-Pt/Al2O3 Catalyst

Thermally Induced Structure and Functionality Evolution of a Pt–based Lean NOx Trap Catalyst

Promotion of Low‐Temperature Oxidation of Propane through Introduction of Ce into Mullite Oxide YMn₂O₅

Contact Info

Product

Resources

About

Activation of Surface Lattice Oxygen in Ceria Supported Pt/Al2O3 Catalyst for Low‐Temperature Propane Oxidation

Cited by 27 publications

References 30 publications

In Situ Investigations on the Facile Synthesis and Catalytic Performance of CeO2-Pt/Al2O3 Catalyst

In Situ Investigations on the Facile Synthesis and Catalytic Performance of CeO2-Pt/Al2O3 Catalyst

Thermally Induced Structure and Functionality Evolution of a Pt–based Lean NOx Trap Catalyst

Promotion of Low‐Temperature Oxidation of Propane through Introduction of Ce into Mullite Oxide YMn2O5

Contact Info

Product

Resources

About

Activation of Surface Lattice Oxygen in Ceria Supported Pt/Al₂O₃ Catalyst for Low‐Temperature Propane Oxidation

Promotion of Low‐Temperature Oxidation of Propane through Introduction of Ce into Mullite Oxide YMn₂O₅