Room temperature oxidation of formaldehyde on Pt-based catalysts: A comparison between ceria and other supports (TiO2, Al2O3 and ZrO2)

Abstract

a b s t r a c t Platinum-based catalysts for the room temperature removal of formaldehyde are prepared on ceria andother supports (TiO2, Al2O3and ZrO2) for comparison, starting from chloride and nitrate precursors.The behaviour towards formaldehyde adsorption and oxidation is evaluated by means of temperature-programmed desorption (TPD), temperature-programmed oxidation (TPO) and catalytic tests. The resultsindicate that the catalytic performances are affected by Pt oxidation state, which, in turn, strongly dependson the properties of the support. In order to obtain high HCHO conversions, the support should guaranteethe accessibility to metal active sites as well as affinity for water. Moreover, to avoid Pt partial oxidation,non-reducible oxides are preferable to reducible ones

Cerium(III) Nitrate Derived CeO2 Support Stabilising PtOx Active Species for Room Temperature CO Oxidation

“…Pt and Ce L 3 -edges XAFS data for the reference compounds (Pt, PtO 2 , H 2 Pt(OH) 6 , Na 2 Pt(OH) 6 , (Me 4 N) 2 10 ], Ce(NO 3 ) 3 · 6H 2 O, and CeO 2 ) were collected at BM23 beam line of ESRF and at 10 C beam line of PALII (Pohang, South Korea).…”

“…Ceria supported platinum group metals (PGM) are widely applicable catalysts used for the oxidation of various harmful gases, including CO and hydrocarbons in automotive exhaust gases. [1,2] Particularly, catalysts containing platinum deposited on ceria were found to provide an excellent CO conversion at moderate temperatures, keeping their activity after hightemperature stresses. [3][4][5][6][7][8][9][10] The PtÀ Ceria interaction lowers the reaction ignition temperature, which is crucial for preventing air pollution when an engine starts or for autonomous air cleaning systems.…”

Platinum‐Supported Zirconia Nanotube Arrays Supported on Graphene Aerogels Modified with Metal–Organic Frameworks: Adsorption and Oxidation of Formaldehyde at Room Temperature

“…[17][18][19][20][21][22] The efficiencyo f noble-metal-supported transition-metal oxides in the removal of formaldehyde at room temperature is considerable. [19,20,23,24] An umber of noble-metal-supported oxidesh ave been used to catalyze formaldehyde degradation,i ncluding Pt/TiO 2 , [25] Pt/ Fe 2 O 3 , [26] Pt/MnO 2 , [27] Pt/MnO x -CeO 2 , [28] Pd-Mn/Al 2 O 3 , [29] Au/ TiO 2 , [30] Ag/CeO 2 , [31] and Ag/Co 3 O 4 . [32] Yazawa et al studied the loading of platinum on metal oxides( e.g.,L a 2 O 3 ,M gO, ZrO 2 , Al 2 O 3 ,S iO 2 /Al 2 O 3 ,S iO 2 ,a nd SO 4 2À -ZrO 2 )t of orm catalysts and the catalytic oxidationo fp ropane at low temperatures.…”

Relationship between Pt particle size and catalyst activity for catalytic oxidation of ultrahigh‐concentration formaldehyde

“…By comparing TiO 2 , Al 2 O 3 , CeO 2 and ZrO 2 , Colussi et al . thought that a non‐reducible support was preferable for avoiding Pt partial oxidation . An et al .…”