A study on HCHO oxidation characteristics at room temperature using a Pt/TiO2 catalyst

Kim, Sung Su; Park, Kwang Hee; Hong, Sung Chang

doi:10.1016/j.apcata.2011.03.018

Cited by 79 publications

(31 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…of 100. Similar results were reported in studies reported by Rooke et al [87] and Kim et al [88]. As the treatment of the toluene, in the present study, was carried out with a synthetic toluene, it is expected that the developed nano-catalysts will still have significant % TN Conv.…”

Section: Catalytic Oxidation Of Toluenesupporting

confidence: 90%

Moderate Temperature Treatment of Gas-Phase Volatile Organic Toluene Using NiO and NiO–TiO2 Nano-catalysts: Characterization and Kinetic Behaviors

Almomani

Bhosale

Khraisheh

2020

Waste Biomass Valor

View full text Add to dashboard Cite

For the first time, the potential of Ni/NiO and NiO–TiO2 nano-catalysts for the oxidation of toluene under moderate temperatures was investigated. The nano-catalysts were prepared using the solution combustion synthesis method (SCSM) and the effect of the composition of nano-catalysts, the inlet toluene concentration $$([\text{C}_{7} {\text{H}}_{8}]_{in})$$ ( [ C 7 H 8 ] in ) , the relative humidity (RH), and the temperature on the percentage of toluene conversion ($$\% {\text{TN}}_{Conv.} )$$ % TN C o n v . ) were subsequently examined. Results revealed that the nano-catalysts synthesized with a low fuel-to-metal ratio produced pure NiO, which has significant catalytic activity toward the conversion of toluene. Conversely, the high fuel-to-metal ratio generated a nano-catalysts that contains a mixture of Ni/NiO or pure Ni with low activity toward the conversion of toluene. Adding NiO to TiO2 increased the surface area of the catalyst, augmented the catalyst active sites, enhanced the oxidation of toluene, and increased CO2 selectivity ($${\text{S}}_{{{\text{CO}}_{2} }}$$ S CO 2 ). NiO and NiO–TiO2 nano-catalysts exhibited higher reaction rates, significant catalyst turnover frequency, and low activation energy. The obtained results revealed that the SCSM is a promising synthesis method for producing NiO or NiO–TiO2 nano-catalysts, which can be employed successfully for the removal of toluene from gas streams. Graphic Abstract

show abstract

Section: Catalytic Oxidation Of Toluenesupporting

confidence: 90%

Moderate Temperature Treatment of Gas-Phase Volatile Organic Toluene Using NiO and NiO–TiO2 Nano-catalysts: Characterization and Kinetic Behaviors

Almomani

Bhosale

Khraisheh

2020

Waste Biomass Valor

View full text Add to dashboard Cite

show abstract

“…3,300 cm −1 indicated the adsorption of water. Several bands at 1,296, 1,338, and 1,389 cm −1 could be ascribed to the bending vibrations of CH ( Nie et al., 2013a , Zhang et al., 2006 ), whereas those at 2,819, 2,771, and 2,732 cm −1 could be assigned to the stretching vibrations of CH ( Huang and Leung, 2011 , Kim et al., 2011 ). Compared with typical CH bands (1,350, 1,465, 2,853, and 2926 cm −1 ), the red-shifted bands in PbO suggest that CH groups were attached to electron-donating groups ( Zou et al., 2014 ).…”

Section: Resultsmentioning

confidence: 98%

“…3,400 cm −1 were observed without signals of –OH, proving the non-hydroxyl-associated HCHO adsorption. The bands at 2,835–2,945 cm −1 and 2,754 cm −1 are attributed to ν(CH) from HCHO and HCOO* ( Huang and Leung, 2011 , Kim et al., 2011 ), respectively, whereas the signals at 1,650 cm −1 and 1,560/1,420 cm −1 are individually assigned to ν(C=O) of the intermediate carbonates and ν as (COO − )/ν s (COO − ) of formate species ( Nie et al., 2013a , Zhang et al., 2006 ). In contrast, the DRIFTS of Pt@Al 2 O 3 reveals different features ( Figure 6 B).…”

Section: Resultsmentioning

confidence: 99%

Ultralow Pt Catalyst for Formaldehyde Removal: The Determinant Role of Support

et al. 2018

View full text Add to dashboard Cite

SummarySupported Pt catalyst has been intensively investigated for formaldehyde elimination owing to its superior reactivity at room temperature (RT). However, the high Pt content is challenging because of its high cost. Herein, we report PbO-supported Pt catalysts with only 0.1 wt % Pt, which can achieve complete conversion of formaldehyde and reliable stability at RT under demanding conditions. Both experiments and simulations demonstrate that PbO interacts strongly with the Pt species, resulting in tight Pb-O-Pt bonding at the metal/support interface and concomitant activation of the surface lattice oxygen of the support. Moreover, PbO exhibits an extremely high capacity of formaldehyde capture through methylene glycol chemisorption rather than the common hydroxyl-associated adsorption, presenting a different reaction mechanism because the active surface lattice oxygen in the vicinity of Pt species offers improved reactivity. This work provides a valuable example for the design of an efficient catalyst for formaldehyde and potentially oxidation of other carbohydrates.

show abstract

“…[22] Kim et al also reported a similar reaction mechanism of HCHO oxidation over Pt/TiO 2 catalyst at room temperature. [32] Here, the reaction mechanism of HCHO oxidation over Na-promoted Pt/TiO 2 catalysts was studied using in situ DRIFTS ( Figure 2 b; Supporting Information, Figure S15). After the samples were exposed to a flow of O 2 + HCHO + He + H 2 O for 60 min, surface formate (1596, 1352 cm À1 for u(COO À ) and 2807, 2703 cm À1 for u(CH), [33] were dominant at steady-state.…”

mentioning

confidence: 99%

Alkali‐Metal‐Promoted Pt/TiO₂ Opens a More Efficient Pathway to Formaldehyde Oxidation at Ambient Temperatures

et al. 2012

View full text Add to dashboard Cite

Formaldehyde is emitted from building and furnishing materials and consumer products, [1] and is known to cause irritation of eyes and respiratory tract, headache, pneumonia, and even cancer. [2,3] It is a dominant indoor air pollutant, especially in developing countries, and significant efforts have gone into indoor HCHO purification to meet environmental regulations and human health needs.Removal of HCHO by adsorbents has been investigated extensively using potassium permanganate, activated carbon, aluminum oxide, and some ceramic materials. [4][5][6] Sorbent effectiveness is typically limited by low adsorption capacities. Catalytic oxidation is the most effective technology for volatile organic compound (VOC) abatement because VOCs can be oxidized to CO 2 over certain catalysts at much lower temperatures than in thermal oxidation. [7][8][9] Supported noble metal catalysts (Pt, Pd, Rh, Au, Ag) or metal oxide catalysts (Ni, Cu, Cr, Mn) have been used for the catalytic oxidation of VOCs. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] Complete oxidation of HCHO over catalysts occurs above 150 8C on clean and oxidized films of Ni, Pd, and Al [15] and over silver-cerium composite oxide, [16] above 100 8C over Ag/MnOx-CeO 2 [18] and Au/CeO 2 , [19] and above 85 8C over Pd-Mn/Al 2 O 3[17] and Au/FeOx. [20] As catalytic oxidation at even lower temperatures is desirable for indoor air purification, the development of a catalyst for total HCHO oxidation at room temperature is of great interest. In our recent study, [21,22] 1 % Pt/TiO 2 catalyst was shown to be effective for HCHO oxidation at room temperature, achieving 100 % conversion of d = 100 ppm HCHO to CO 2 and H 2 O at a gas hourly space velocity (GHSV) of 50 000 h À1 . However, we also observed that this type catalyst is not as active as needed for practical applications, and deactivates with time-on-stream.Herein, we report a novel alkali-metal-promoted Pt/TiO 2 catalyst for the ambient destruction of HCHO. We show that the addition of alkali-metal ions (such as Li + , Na + , and K + ) to Pt/TiO 2 catalyst stabilized an atomically dispersed Pt-O(OH)x-alkali-metal species on the catalyst surface and also opened a new low-temperature reaction pathway, significantly promoting the activity for the HCHO oxidation by activating H 2 O and catalyzing the facile reaction between surface OH and formate species to total oxidation products.Figure 1 a shows the HCHO conversion to CO 2 as a function of temperature over the x % Na-1 % Pt/TiO 2 (x = 0, 1, and 2) samples at a GHSV of 120 000 h À1 and HCHO inlet of d = 600 ppm. All gas streams were humidified to a RH of around 50 %. Before each activity test, the samples were reduced in H 2 at 300 8C for 30 min. The sodium-free catalyst had low activity for the HCHO oxidation reaction, with HCHO conversion being only about 19 % at 15 8C. With 1 % Na addition, the HCHO conversion reached 96 % at 15 8C and 100 % at 40 8C. With 2 % Na addition, 100 % HCHO conversion to CO 2 and H 2 O was measured at 15 8C. The effect of ...

show abstract

A study on HCHO oxidation characteristics at room temperature using a Pt/TiO2 catalyst

Cited by 79 publications

References 15 publications

Moderate Temperature Treatment of Gas-Phase Volatile Organic Toluene Using NiO and NiO–TiO2 Nano-catalysts: Characterization and Kinetic Behaviors

Moderate Temperature Treatment of Gas-Phase Volatile Organic Toluene Using NiO and NiO–TiO2 Nano-catalysts: Characterization and Kinetic Behaviors

Ultralow Pt Catalyst for Formaldehyde Removal: The Determinant Role of Support

Alkali‐Metal‐Promoted Pt/TiO₂ Opens a More Efficient Pathway to Formaldehyde Oxidation at Ambient Temperatures

Contact Info

Product

Resources

About

A study on HCHO oxidation characteristics at room temperature using a Pt/TiO2 catalyst

Cited by 79 publications

References 15 publications

Moderate Temperature Treatment of Gas-Phase Volatile Organic Toluene Using NiO and NiO–TiO2 Nano-catalysts: Characterization and Kinetic Behaviors

Moderate Temperature Treatment of Gas-Phase Volatile Organic Toluene Using NiO and NiO–TiO2 Nano-catalysts: Characterization and Kinetic Behaviors

Ultralow Pt Catalyst for Formaldehyde Removal: The Determinant Role of Support

Alkali‐Metal‐Promoted Pt/TiO2 Opens a More Efficient Pathway to Formaldehyde Oxidation at Ambient Temperatures

Contact Info

Product

Resources

About

Alkali‐Metal‐Promoted Pt/TiO₂ Opens a More Efficient Pathway to Formaldehyde Oxidation at Ambient Temperatures