Highly dispersed and active supported Pt nanoparticles for gaseous formaldehyde oxidation: Influence of particle size

Huang, Haibao; Hu, Peng; Huang, Huiling; Chen, Jiandong; Ye, Xinguo; Leung, Dennis Y.C.

doi:10.1016/j.cej.2014.04.108

Cited by 102 publications

(34 citation statements)

References 47 publications

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“…reported that activity was a balance between Pt dispersion and TOF, so the size of Pt was very important . For HCHO oxidation, the influence of Pt particle size was also studied previously and with similar results . Nevertheless, the relationship between Pt particle size and catalyst activity for the oxidation of HCHO on AC has not been reported yet.…”

Section: Introductionmentioning

confidence: 78%

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

Liu

Guan

et al. 2019

Applied Organom Chemis

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The effects of particle size and kinetics of Pt/activated carbon (AC) catalysts on catalytic oxidation of formaldehyde (HCHO) were investigated. AC, f-SiO 2 and MCM-41 were used as supports to prepare low-Pt-content catalysts using H 2 reduction. Pt/AC catalyst shows the highest activity with the largest Pt particle size. By contrast, 0.1 wt% Pt/AC reduced using KBH 4 has much higher activity than that reduced using H 2 , which can oxidize HCHO completely over 6000 ppm at 60°C in a fixed bed reactor. Transmission electron microscopy and X-ray photoelectron spectroscopy results indicate that Pt/AC-KBH 4 has larger Pt particles and lower valence state than Pt/AC-H 2 , which may be attributed to the ligand effect between Pt 4+ and the AC support. The result of O 2 temperature-programmed oxidation suggests that highly dispersed Pt 4+ ions have stronger interaction with AC support and thus are harder to be reduced by H 2 . Furthermore, Pt/AC is structure-sensitive and larger-sized Pt particles result in a high conversion of HCHO. Investigation of kinetics indicated that it is a zero-order reaction for such a high HCHO concentration condition for Pt/AC-KBH 4 .

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Section: Introductionmentioning

confidence: 78%

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

Liu

Guan

et al. 2019

Applied Organom Chemis

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“…The use of catalysts allows carrying out VOCs oxidation at relatively low temperatures at complete conversion. As a rule, two main types of effective catalysts for total oxidation of VOCs are developed, including supported metals (e.g., Au, Pt, Pd, Ag) [125][126][127][128][129][130] and transition metal oxides (CeO 2 , MnO 2 , Co 3 O 4 ) [130][131][132][133]. The combination of noble metal and transition metal oxide used as a support or modifier is promising to increase the effectiveness of catalytic composites [134][135][136].…”

Section: Vocs Abatementmentioning

confidence: 99%

Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs

et al. 2018

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Nowadays catalytic technologies are widely used to purify indoor and outdoor air from harmful compounds. Recently, Ag-CeO 2 composites have found various applications in catalysis due to distinctive physical-chemical properties and relatively low costs as compared to those based on other noble metals. Currently, metal-support interaction is considered the key factor that determines high catalytic performance of silver-ceria composites. Despite thorough investigations, several questions remain debating. Among such issues, there are (1) morphology and size effects of both Ag and CeO 2 particles, including their defective structure, (2) chemical and charge state of silver, (3) charge transfer between silver and ceria, (4) role of oxygen vacancies, (5) reducibility of support and the catalyst on the basis thereof. In this review, we consider recent advances and trends on the role of silver-ceria interactions in catalytic performance of Ag/CeO 2 composites in low-temperature CO oxidation, soot oxidation, and volatile organic compounds (VOCs) abatement. Promising photoand electrocatalytic applications of Ag/CeO 2 composites are also discussed.Au [17][18][19][20][21][22][23], Ru [24,25], Rh [26][27][28][29], and Cu [30,31] were proposed. Metal oxide-based catalysts (Co 3 O 4 [32], MnO x [33], etc.) also attracted wide interest. However, a significant part of the developed catalysts has limited use under real conditions due to high costs of noble metals (the loading of palladium, platinum, gold is of 2-10 wt. %), relatively low stability to "hard" conditions of oxidation processes causing the loss of active component and reduction of the catalyst activity and selectivity. Therefore, the development of high-performance affordable and stable catalysts for low-temperature total oxidation of harmful compounds is still challenging. Efficiency and costs of such catalysts are connected with proper selection of the type of active component, support, and preparation method [34].Recently, supported silver catalysts have brought about wide interest due to their high activity in low-temperature oxidation processes. Different supports are studied (SiO 2 , CeO 2 , MnO x , TiO 2 , Al 2 O 3 , ZrO 2 , etc.) [35][36][37][38]. It is shown that an enhanced catalytic activity of Ag-based catalysts can be achieved by using reducible metal oxides as supports and by controlling the metal-support interaction to provide synergistic effect between active sites of the support and noble metal [39].Among the supports mentioned, CeO 2 brings about high interest, since it combines exceptional redox and acid-base properties with oxygen storage, which can be controlled by proper preparation methods and treatments. Moreover, these distinctive properties of ceria cause its wide applications as a support for catalysts. For this reason, highly active and relatively inexpensive Ag/CeO 2 composite is considered promising heterogeneous catalyst for total oxidation of harmful organic compounds, including formaldehyde [40], , soot [44][45][46][47][48][49]. The Ag...

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“…[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.…”

Section: Introductionmentioning

confidence: 99%

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

Tan

Chen

et al. 2019

Chemistry A European J

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Precious-metal catalysts (e.g.,A u, Rh, Ag, Ru, Pt, and Pd)s upported on transition-metal oxides (e.g.,A l 2 O 3 , Fe 2 O 3 ,CeO 2 ,ZrO 2 ,Co 3 O 4 ,MnO 2 ,T iO 2 ,and NiO) can effectively oxidize volatile organic compounds. In this study,p orous platinum-supported zirconia materials have been prepared by a" surface-casting" method.T he synthesized catalysts presenta no rdered nanotube structure and exhibited excellent performance toward the catalytic oxidation of formaldehyde. Af acile method, utilizing ab oilingw ater bath, was used to fabricate graphene aerogel (GA), and the macroscopic 3D Pt/ZrO 2 -GA was modified by introducing an adjustable MOF coating by as urfaces tep-by-stepm ethod.T he unblocked mesoporous structure of the graphene aerogel facilitates the ingress and egress of reactants and product molecules. The selected 7wt.% Pt/ZrO 2 -GA-MOF-5 composite demonstrated excellent performance for HCHO adsorption. Additionally,t his catalysta chieved around 90 %c onversion when subjectedto ar eaction temperature of 70 8C (T 90 % = 70 8C). The Pt/ZrO 2 -GA-MOF-5c omposite induces a catalytic cycle, increasing the conversion by simultaneously adsorbing and oxidizing HCHO. Thisw ork providesasimple approacht oi ncreasing reactantc oncentration on the catalyst to increase the rate of reaction.

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Highly dispersed and active supported Pt nanoparticles for gaseous formaldehyde oxidation: Influence of particle size

Cited by 102 publications

References 47 publications

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

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

Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs

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

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