Novel Au/TiO2/Al2O3 · xH2O catalysts for CO oxidation

Yan, Wen; Ma, Zhen; Mahurin, Shannon M.; Hagaman, Edward W.; Overbury, Steven H.; Dai, Sheng

doi:10.1007/s10562-007-9369-1

Cited by 16 publications

(18 citation statements)

References 52 publications

(101 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(2) can we find active gold catalysts based on previously overlooked supports (e.g., metal phosphates)? In addition, the effects of the crystal phase [65,82,[96][97][98][99][100], size [99,[101][102][103][104][105][106][107][108], and shape [45,[108][109][110][111][112][113][114] of solid supports on the catalytic performance are also of interest. Below we first present the development of Au/SiO 2 and Au/metal phosphate catalysts in our group, and then highlight recent findings on the effects of the particle size and shape of solid supports.…”

Section: General Considerationsmentioning

confidence: 99%

“…Indeed, Fe 2 O 3 , TiO 2 , NiO x , and CoO x have been classified as "active" supports because they are reducible and can activate and store oxygen, whereas Al 2 O 3 and SiO 2 were classified as "inert" supports because they may not be able to supply reactive oxygen for CO oxidation [117]. Nevertheless, Au/Al 2 O 3 [82,109,118,119] and Au/SiO 2 [93,95,[120][121][122][123][124][125] can be active for CO oxidation. For example, Au/SiO 2 prepared via gas-phase grafting of dimethyl gold acetylacetonate exhibited high activity in CO oxidation [120][121][122].…”

Section: Au/siomentioning

confidence: 99%

“…The [186] should be treated with caution, because experimentally, Au/Al 2 O 3 catalysts were found to be active for CO oxidation [82,109,118,119]. Indeed, Liu and co-workers recently found that the presence of moisture could assist the activation of oxygen, thus promoting CO oxidation on Au/Al 2 O 3 [187].…”

Section: Pre-modification Of Tio 2 Supportsmentioning

confidence: 99%

“…Our group modified various Al 2 O 3 supports (boehmite AlOOH, amorphous Al(OH) 3 , and highly crystalline γ-Al 2 O 3 ) by amorphous TiO 2 via a surface-sol-gel method, and then loaded gold nanoparticles via deposition-precipitation [82]. The activity in CO oxidation was significantly enhanced after pretreating the Au/TiO 2 /Al 2 O 3 catalysts at high temperature.…”

Section: Pre-modification Of Al 2 O 3 Supportsmentioning

confidence: 99%

See 3 more Smart Citations

Development of novel supported gold catalysts: A materials perspective

2010

Self Cite

View full text Add to dashboard Cite

Since Haruta et al. discovered that small gold nanoparticles finely dispersed on certain metal oxide supports can exhibit surprisingly high activity in CO oxidation below room temperature, heterogeneous catalysis by supported gold nanoparticles has attracted tremendous attention. The majority of publications deal with the preparation and characterization of conventional gold catalysts (e.g., Au/TiO 2 ), the use of gold catalysts in various catalytic reactions, as well as elucidation of the nature of the active sites and reaction mechanisms. In this overview, we highlight the development of novel supported gold catalysts from a materials perspective. Examples, mostly from those reported by our group, are given concerning the development of simple gold catalysts with single metal-support interfaces and heterostructured gold catalysts with complicated interfacial structures. Catalysts in the first category include active Au/SiO 2 and Au/metal phosphate catalysts, and those in the second category include catalysts prepared by pre-modification of supports before loading gold, by post-modification of supported gold catalysts, or by simultaneous dispersion of gold and an inorganic component onto a support. CO oxidation has generally been employed as a probe reaction to screen the activities of these catalysts. These novel gold catalysts not only provide possibilities for applied catalysis, but also furnish grounds for fundamental research.

show abstract

Section: General Considerationsmentioning

confidence: 99%

Section: Au/siomentioning

confidence: 99%

Section: Pre-modification Of Tio 2 Supportsmentioning

confidence: 99%

Section: Pre-modification Of Al 2 O 3 Supportsmentioning

confidence: 99%

See 2 more Smart Citations

Development of novel supported gold catalysts: A materials perspective

2010

Self Cite

View full text Add to dashboard Cite

show abstract

“…It has been suggested that gold on reducible supports (e.g., TiO 2 , CeO 2 , Fe 2 O 3 ) exhibits higher activity in CO oxidation than gold on non-reducible supports (e.g., Al 2 O 3 , SiO 2 ) because the former can activate oxygen [6][7][8]. Nevertheless, properly prepared Au/Al 2 O 3 [9][10][11] and Au/SiO 2 [12][13][14][15][16][17][18][19] can also show high activities in CO oxidation.…”

Section: Introductionmentioning

confidence: 99%

Metal Phosphates as a New Class of Supports for Gold Nanocatalysts

Yin

Overbury

et al. 2008

Catal Lett

Self Cite

View full text Add to dashboard Cite

Oxides and carbon are commonly used as supports for gold nanoparticles, but metal salts are barely considered as suitable supports. Our group recently communicated that gold nanoparticles supported on nanosized LaPO 4 (6-8 nm) are active for CO oxidation (Yan et al., Angew Chem Int Ed 45:3614, 2006). In the current work, we systematically developed an array of Au/M-P-O catalysts and tested them for catalytic activity and stability. It was found that 200°C-pretreated Au/M-P-O (M = Ca, Fe, Co, Y, La, Pr, Nd, Sm, Eu, Ho, Er) show high CO conversions below 50°C, and 500°C-pretreated Au/M-P-O (M = Ca, Y, La, Pr, Nd, Sm, Eu, Ho, Er) show high CO conversions below 100°C. These samples were characterized by ICP-OES, BET, XRD, TEM, SEM, and H 2 -TPR. The stability of selected catalysts was studied as a function of time on stream. This work furnishes a new catalyst system for further fundamental and applied research.

show abstract

Effect of MgO content in the support of Au/MgF2–MgO catalysts on CO oxidation

Tomska-Foralewska

Przystajko

Pietrowski

et al. 2010

Reac Kinet Mech Cat

View full text Add to dashboard Cite

Novel magnesium oxo-fluoride supports containing different amounts of MgO, prepared by the sol-gel method have been proposed for the synthesis of gold catalysts. The MgF 2 -MgO supports have mesoporous structure and their surface area is a few times larger than those of pure MgF 2 or pure MgO. Gold catalysts have been prepared by impregnation of the MgF 2 -MgO supports with HAuCl 4 in the amount corresponding to 1 wt.% Au. The gold catalysts has been characterized by XRD, TEM measurements and the catalytic activity in CO oxidation at temperatures 30-300°C have been performed. The Au/MgF 2 -MgO catalysts show higher activities (depending on the content of MgO in the support) as compared to Au/ MgF 2 and Au/MgO prepared under the same conditions. Their activities fall into the upper range of gold catalysts supported on other carrier reported in literature.

show abstract

Novel Au/TiO2/Al2O3 · xH2O catalysts for CO oxidation

Cited by 16 publications

References 52 publications

Development of novel supported gold catalysts: A materials perspective

Development of novel supported gold catalysts: A materials perspective

Metal Phosphates as a New Class of Supports for Gold Nanocatalysts

Effect of MgO content in the support of Au/MgF2–MgO catalysts on CO oxidation

Contact Info

Product

Resources

About