Single stage water gas shift conversion over Pt/TiO2—Problem of catalyst deactivation

Azzam, Khalid G.; Babich, Igor V.; Seshan, Kulathuiyer; Lefferts, Leon

doi:10.1016/j.apcata.2007.12.020

Cited by 40 publications

(25 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Hydroxyl groups formed on the titania layer incorporated on the SBA-15 at the adsorption of benzaldehyde caused a broad band around 3500 cm -1 . C-H stretching bands of alkyl and aldehyde groups appeared at Unusual adsorption of hydrogen and carbon monoxide on platinum catalysts dispersed on titania support after reduction at high temperature is usually explained by the decoration of platinum with titania [23][24][25]. Titania migrates to the exposed surface of platinum particles and reduces effective platinum atoms for their adsorption.…”

Section: Resultsmentioning

confidence: 98%

“…These clear differences in distribution among silicon, titanium and platinum were due to the interaction between platinum and titania. The exceptionally high platinum dispersion on the titania-incorporated SBA-15 was primarily responsible for the titania layer incorporated onto it, inducing the SMSI with platinum and maintaining the high dispersion of platinum even at high temperature [23][24][25].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of Highly Dispersive and Stable Platinum Catalysts Supported on Siliceous SBA-15 Mesoporous Material: Roles of Titania Layer Incorporation and Hydrogen Peroxide Treatment

et al. 2008

View full text Add to dashboard Cite

Roles of titania layer incorporation and hydrogen peroxide treatment in the preparation of highly dispersed platinum catalysts supported on siliceous SBA-15 mesoporous materials were studied by examining the catalysts at each step of the preparation. XRD, TEM, XPS, Raman, IR, CO chemisorptions, EXAFS and XANES techniques were employed to the investigation of the physico-chemical states of platinum and titanium. The platinum particles were uniformly dispersed on SBA-15 ranged from 1 to 2 nm in size by incorporating titania onto the surface of SBA-15 and then treating the impregnating platinum precursor with hydrogen peroxide, even at platinum loading as high as 4 wt.%. The platinum catalysts showed considerably higher catalytic activity in the combustion reactions of both carbon monoxide and methane, suggesting a suitable catalyst for purifying diesel engine exhaust.

show abstract

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Preparation of Highly Dispersive and Stable Platinum Catalysts Supported on Siliceous SBA-15 Mesoporous Material: Roles of Titania Layer Incorporation and Hydrogen Peroxide Treatment

et al. 2008

View full text Add to dashboard Cite

show abstract

“…However, these catalyst systems suffer from certain drawbacks when used in small-scale fuel processors with characteristics such as cyclic operation and the possibility of air contamination [3,4]. To overcome these weak points of commercial WGS catalysts, some noble metal catalysts including Pt group metals have been extensively studied [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Panagiotopoulou and Kondarides [5] compared the WGS activity among various noble metal catalysts supported on Al 2 O 3 and reported that the catalytic activity followed the order of Pt>Rh≈Ru>Pd.…”

Section: Introductionmentioning

confidence: 99%

Water-gas shift reaction over supported Pt and Pt-CeOx catalysts

Kim

Park

2010

Korean J. Chem. Eng.

View full text Add to dashboard Cite

A comparison study was performed of the water-gas shift (WGS) reaction over Pt and ceria-promoted Pt catalysts supported on CeO 2 , ZrO 2 , and TiO 2 under rather severe reaction conditions: 6.7 mol% CO, 6.7 mol% CO 2 , and 33.2 mol% H 2 O in H 2 . Several techniques--CO chemisorption, temperature-programmed reduction (TPR), and inductively coupled plasma-atomic emission spectroscopy (ICP-AES)--were employed to characterize the catalysts. The WGS reaction rate increased with increasing amount of chemisorbed CO over Pt/ZrO 2 , Pt/TiO 2 , and Pt-CeO x /ZrO 2 , whereas no such correlation was found over Pt/CeO 2 , Pt-CeO x /CeO 2 , and Pt-CeO x /TiO 2 . For these catalysts in the absence of any impurities such as Na + , the WGS activity increased with increasing surface area of the support, showed a maximum value, and then decreased as the surface area of the support was further increased. An adverse effect of Na + on the amount of chemisorbed CO and the WGS activity was observed over Pt/CeO 2 . Pt-CeO x /TiO 2 (51) showed the highest WGS activity among the tested supported Pt and Pt-CeO x catalysts. The close contact between Pt and the support or between Pt and CeO x , as monitored by H 2 -TPR, is closely related to the WGS activity. The catalytic stability at 583 K improved with increasing surface area of the support over the CeO 2 -and ZrO 2 -supported Pt and Pt-CeO x catalysts.

show abstract

“…Nevertheless, Pt [16], Pd [7] and Au [17] supported catalysts used under realistic water gas shift streams and in frequent start/stop cycles are irreversibly deactivated. Furthermore, the destabilization at high temperatures by sintering of the metal and support has also been reported and represents a problem to overcome for the noble metal supported catalysts in the WGS [18].…”

mentioning

confidence: 99%

Mono and bimetallic Cu-Ni structured catalysts for the water gas shift reaction

Arbeláez

Reina

Ivanova

et al. 2015

Applied Catalysis A: General

View full text Add to dashboard Cite

Highlights-Efficient Cu-Ni catalysts supported on activated carbon for the water gas shift reaction.-Supressed methanation activity due to the presence of Cu.-Cu-Ni alloy as a key factor of the catalytic design.-Good stability and tolerance towards start/stop situations. AbstractThe water-gas shift (WGS) reaction over structured Cu, Ni, and bimetallic Cu-Ni supported on active carbon (AC) catalysts was investigated. The structured catalysts were prepared in pellets form and applied in the medium range WGS reaction. A good activity in the 180-350 °C temperature range was registered being the bimetallic Cu-Ni:2-1/AC catalyst the best catalyst. Page 2 of 38A c c e p t e d M a n u s c r i p tThe presence of Cu mitigates the methanation activity of Ni favoring the shift process. In addition the active carbon gasification reaction was not observed for the Cu-containing catalyst converting the active carbon in a very convenient support for the WGS reaction. The stability of the bimetallic Cu-Ni:2-1/AC catalyst under continuous operation conditions, as well as its tolerance towards start/stop cycles was also evaluated.

show abstract

Single stage water gas shift conversion over Pt/TiO2—Problem of catalyst deactivation

Cited by 40 publications

References 27 publications

Preparation of Highly Dispersive and Stable Platinum Catalysts Supported on Siliceous SBA-15 Mesoporous Material: Roles of Titania Layer Incorporation and Hydrogen Peroxide Treatment

Preparation of Highly Dispersive and Stable Platinum Catalysts Supported on Siliceous SBA-15 Mesoporous Material: Roles of Titania Layer Incorporation and Hydrogen Peroxide Treatment

Water-gas shift reaction over supported Pt and Pt-CeOx catalysts

Mono and bimetallic Cu-Ni structured catalysts for the water gas shift reaction

Contact Info

Product

Resources

About