Untitled

Luo, Ming; Hou, Zhaoyin; Yuan, Xingzhong; Zheng, Xiao-Ming

doi:10.1023/a:1019023220271

Cited by 145 publications

(79 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Such results are also consistent with the general considerations that the reduction temperature of PdO in Pd/CeO 2 shifts to a higher value compared with the individual PdO, while the reduction temperature of CeO 2 in Pd/CeO 2 is lower than that of individual CeO 2 , due to the interaction between PdO and CeO 2 [12,47].…”

Section: H 2 -Tprsupporting

confidence: 91%

“…Although CO was rarely used as reducing agent in the TPR characterization compared with H 2 , CO-TPR is one of the best probes to investigate the reducibility of both the PdO and the supports for CO-involved reactions and is helpful to identify the surface oxygen species and the finely dispersed PdO [12,48,49].…”

Section: Co-tprmentioning

confidence: 99%

“…Catalysts containing noble metals such as Au [1][2][3][4][5][6], Pt [7,8], and Pd [9][10][11][12] have been proved very effective for CO oxidation at low temperature. Pd supported catalysts have drawn much attention due to the excellent activity for the low-tivity for CO oxidation even at relatively low temperatures due to the synergistic effect between gold and TiO 2 support [18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pd/CeO2?TiO2 catalyst for CO oxidation at low temperature: a TPR study with H2 and CO as reducing agents

Zhu

2004

Journal of Catalysis

View full text Add to dashboard Cite

The catalysts Pd/TiO 2 , Pd/CeO 2 , and Pd/CeO 2 -TiO 2 for CO oxidation at low temperature together with their corresponding supports TiO 2 , CeO 2 , and CeO 2 -TiO 2 prepared by sol-gel precipitation followed by supercritical fluid drying were characterized by means of N 2 adsorption, XRD, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) of CO adsorption and temperature-programmed reduction (TPR) with H 2 and CO as reducing agents. The results showed that PdO is finely dispersed on the supports with high surface area. DRIFTS of CO adsorption further indicated that both Pd 2+ and Pd 0 species coexist in Pd/CeO 2 , while only Pd 0 is detected in Pd/TiO 2 and Pd/CeO 2 -TiO 2 . H 2 -TPR showed that no bulk CeO 2 exists in CeO 2 -TiO 2 and the reduction of CeO 2 -TiO 2 is more difficult than that of the surface oxygen in the individual CeO 2 probably due to the formation of CeO 2 -TiO 2 solid solution. PdO in Pd/TiO 2 can be fully reduced by H 2 at ambient temperature, whereas PdO in Pd/CeO 2 and Pd/CeO 2 -TiO 2 is reduced respectively at 162 and 80 • C, accompanied by the reduction of surface CeO 2 . CO-TPR showed that the reduction of PdO in PdO/TiO 2 is limited within the outermost layer at ambient temperature and the core PdO can only be reduced with a further increase of temperature. PdO/CeO 2 is also reduced both at ambient temperature and with the increase of temperature during the CO-TPR process, and the reduction temperature of CeO 2 decreased significantly in the presence of PdO, which may be due to the different degrees of interaction between PdO and CeO 2 . In contrast, a complete reduction of PdO in Pd/CeO 2 -TiO 2 by CO is observed at ambient temperature, accompanied by the partial reduction of CeO 2 , which may indicate that the special Pd-Ce-Ti interaction in Pd/CeO 2 -TiO 2 is favorable for the reduction of PdO and interfacial CeO 2 species. The water-gas shift (WGS) between CO and the hydroxyl groups in the catalysts is detected at a temperature higher than 210 • C on all of the Pd-supported catalysts as well as the individual CeO 2 and TiO 2 supports.  2004 Elsevier Inc. All rights reserved.

show abstract

Section: H 2 -Tprsupporting

confidence: 91%

Section: Co-tprmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pd/CeO2?TiO2 catalyst for CO oxidation at low temperature: a TPR study with H2 and CO as reducing agents

Zhu

2004

Journal of Catalysis

View full text Add to dashboard Cite

show abstract

“…2) and leads to the easy interaction of ethanol with oxygen. Moreover, PdO weakens the CeAO bond thus increasing the mobility of the lattice oxygen, which may be involved in the ethanol oxidation [9,13]. This supposition needs to be identified using labeled oxygen for the oxidation of ethanol in further study.…”

Section: Tpsr and Tpdmentioning

confidence: 99%

“…There are two major reasons for this renewed interest in palladium. First, PdO is by far the cheapest noble metal in the market for its ability to catalyze VOCs at significantly low temperature; second, to achieve faster light-off performance, Pd-based catalyst offer significant advantages over the traditional three-way catalysts [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The Mechanism Studies of Ethanol Oxidation on PdO Catalysts by TPSR Techniques

et al. 2004

Self Cite

View full text Add to dashboard Cite

The paper studies the direct oxidation of ethanol and CO on PdO/Ce 0.75 Zr 0.25 O 2 and Ce 0.75 Zr 0.25 O 2 catalysts. Characterization of catalysts is carried out by temperature-programmed desorption (TPD), temperature-programmed surface reaction (TPSR) techniques to correlate with catalytic properties and the effect of supports on PdO. The simple Ce 0.75 Zr 0.25 O 2 is in less active for ethanol and CO oxidation. After loaded with PdO, the catalytic activity enhances effectively. Combined the ethanol and CO oxidation activity with CO-TPD and ethanol-TPSR profiles, we can find the more intensive of CO 2 desorption peaks, the higher it is for the oxidation of CO and ethanol. Conversion versus yield plot shows the acetaldehyde is the primary product, the secondary products are acetic acid, ethyl acetate and ethylene, and the final product is CO 2 . A simplified reaction scheme (not surface mechanism) is suggested that ethanol is first oxidized to form intermediate of acetaldehyde, then acetic acid, ethyl acetate and ethylene formed going with the formation of acetaldehyde, acetic acid, ethyl acetate; finally these byproducts are further oxidized to produce CO 2 . PdO/Ce 0.75 Zr 0.25 O 2 catalyst has much higher catalytic activity not only for the oxidation of ethanol but also for CO oxidation. Thus the CO poison effect on PdO/Ce 0.75 Zr 0.25 O 2 catalysts can be decreased and they have the feasibility for application in direct alcohol fuel cell (DAFC) with high efficiency.

show abstract

Low‐Temperature CO Oxidation over a Ternary Oxide Catalyst with High Resistance to Hydrocarbon Inhibition

et al. 2015

View full text Add to dashboard Cite

Platinum group metal (PGM) catalysts are the current standardf or control of pollutants in automotive exhaust streams.A side from their high cost, PGM catalysts struggle with CO oxidation at lowtemperatures (< 200 8 8C) due to inhibition by hydrocarbons in exhaust streams.H ere we present at ernary mixed oxide catalyst composed of copper oxide,cobalt oxide,and ceria (dubbed CCC) that outperforms synthesized and commercial PGM catalysts for CO oxidation in simulated exhaust streams while showing no signs of inhibition by propene.D iffuse reflectance IR (DRIFTS) and light-off data both indicate lowi nteraction between propene and the CO oxidation active site on this catalyst, and as eparation of adsorption sites is proposed as the cause of this inhibition resistance.This catalyst shows great potential as alow-cost component for low temperature exhaust streams that are expected to be acharacteristic of future automotive systems.

show abstract

Untitled

Cited by 145 publications

References 0 publications

Pd/CeO2?TiO2 catalyst for CO oxidation at low temperature: a TPR study with H2 and CO as reducing agents

Pd/CeO2?TiO2 catalyst for CO oxidation at low temperature: a TPR study with H2 and CO as reducing agents

The Mechanism Studies of Ethanol Oxidation on PdO Catalysts by TPSR Techniques

Low‐Temperature CO Oxidation over a Ternary Oxide Catalyst with High Resistance to Hydrocarbon Inhibition

Contact Info

Product

Resources

About