High-efficiency palladium/halloysite nanotubes catalyst for toluene catalytic oxidation: Characterization, performance and reaction mechanism
Source abstract
Abstract
In this study, the halloysite treated with nitric acid was designed as a functionalized support material for favoring surface availability and dispersion of nanometric palladium (Pd) nanoparticles. The prepared supported catalysts were characterized by X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), H 2 temperature-programmed reduction (H 2-TPR), and O 2 temperature-programmed desorption (O 2 -TPD). The catalytic performance and reaction mechanism of toluene oxidation were evaluated and proposed. Scanning and transmission electron microscopy images showed that 4–5 nm diameter Pd nanoparticles were uniformly dispersed on the external and edge surfaces of the A-Hal nanotubes and no obvious aggregations observed. The Pd nanoparticles were mainly present in the zero-valent state. The ratio of metallic Pd to Pd oxide species and adsorbed (O ads) to lattice (O latt ) presented a maximum value of 2.54 and 23.0, respectively, when the Pd loading was 0.5%. The prepared support catalysts exhibited a satisfactory catalytic performance and cycling stability for toluene conversion. Among the analyzed samples, the 0.5% Pd/A-Hal catalyst exhibited the highest catalytic activity for toluene oxidation, stability, and water resistance. Toluene conversions of 50% and 90% were obtained at 167 and 185 °C, respectively. In situ diffuse reflection Fourier transform spectroscopy measurements confirmed the intermediates generated during toluene oxidation and revealed that toluene oxidation occurred via the benzyl alcohol → benzaldehyde → benzoic acid → maleic anhydride reaction pathway over the obtained catalysts. These results were attributed to the high content of metal Pd species, abundant O ads species, and low-temperature reducibility. These results indicate that Hal support catalysts are promising materials for application in environmental protection.
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Research context
OpenAlex topics: Clay minerals and soil interactions · Iron oxide chemistry and applications · Layered Double Hydroxides Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (57)
Show source-provided references
1. Identification of key reaction intermediates during toluene combustion on a Pd/CeO2 catalyst using operando modulated DRIFT spectroscopy10.1016/j.cattod.2021.09.009 ↗
2. Excellent catalytic activity and water resistance of UiO-66-supported highly dispersed Pd nanoparticles for toluene catalytic oxidation10.1016/j.apcatb.2020.118767 ↗
3. Developments in odour control and waste gas treatment biotechnology: a review10.1016/S0734-9750(00)00058-6 ↗
4. Catalytic combustion of toluene over mesoporous Cr2O3-supported platinum catalysts prepared by in situ pyrolysis of MOFs10.1016/j.cej.2017.10.091 ↗
5. Thermal analysis and infrared emission spectroscopic study of halloysite–potassium acetate intercalation compound10.1016/j.tca.2010.08.003 ↗
6. In situ characterizations of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts for oxidative steam reforming of propane10.1016/j.apcatb.2009.07.001 ↗
7. Clay nanotube-metal core/shell catalysts for hydroprocesses10.1039/D1CS00502B ↗
8. Highly active Pd-based catalysts with hierarchical pore structure for toluene oxidation: catalyst property and reaction determining factor10.1016/j.cej.2011.10.099 ↗
9. Preparation and characterization of manganese oxides supported on functionalized halloysite nanotubes with enhanced catalytic oxidation for toluene10.1016/j.clay.2021.106147 ↗
10. Effect of Y modified ceria support in mono and bimetallic Pd–Au catalysts for complete benzene oxidation
11. Halloysite clay minerals - a review10.1180/0009855054040180 ↗
12. Catalytic oxidation of volatile organic compounds (VOCs) – a review10.1016/j.atmosenv.2016.05.031 ↗
13. Manganese and Cobalt Doped hierarchical mesoporous halloysite-based catalysts for selective oxidation of p-Xylene to terephthalic acid
14. Catalytic oxidation of toluene over Pd/Co3AlO catalysts derived from hydrotalcite-like compounds: Effects of preparation methods10.1016/j.apcatb.2010.10.030 ↗
15. Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation10.1016/j.apcata.2017.11.003 ↗
16. Highly efficient Pd catalysts loaded on La1−Sr MnO3 perovskite nanotube support for low-temperature toluene oxidation10.1016/j.jallcom.2021.159575 ↗
17. Complete oxidation of toluene on Pd/modified-CeO 2 catalysts10.1016/j.jtice.2016.07.033 ↗
18. Separation of VOCs from N2using poly(ether block amide) membranes10.1002/cjce.20181 ↗
19. The catalytic oxidation of formaldehyde over palygorskite-supported copper and manganese oxides: Catalytic deactivation and regeneration10.1016/j.apsusc.2018.09.070 ↗
20. Low-temperature methane combustion over Pd/H-ZSM-5: active Pd sites with specific electronic properties modulated by acidic sites of H-ZSM-510.1021/acscatal.6b01801 ↗
21. Plant-Mediated synthesis of Ag–Pd alloy nanoparticles and their application as catalyst toward selective hydrogenation10.1021/sc500034r ↗
22. Complete methanol oxidation in carbon monoxide streams over Pd/CeO2 catalysts: correlation between activity and properties10.1016/j.apcatb.2013.02.020 ↗
23. Clean synthesis of RGO/Mn3O4 nanocomposite with well-dispersed Pd nanoparticles as a high-performance catalyst for hydroquinone oxidation10.1016/j.jcis.2019.05.009 ↗
24. Halloysite nanotubes as support for metal-based catalysts10.1039/C7TA02996A ↗
25. Chemical modification of halloysite nanotubes for controlled loading and release10.1039/C8TB00543E ↗
26. Halloysite nanotubes: smart nanomaterials in catalysis10.3390/catal12020149 ↗
27. A study on the formation of palladium hydride in a carbon-supported palladium catalyst10.1021/jp004535q ↗
28. Supported au catalysts for low-temperature abatement of propene and toluene, as model VOCs: support effect10.1016/j.apcatb.2010.11.004 ↗
29. Characterisation of properties of various halloysites relevant to their use as nanotubes and microfibre fillers10.1016/j.clay.2012.06.014 ↗
30. Fe-ZSM-5 supported palladium nanoparticles as an efficient catalyst for toluene abatement10.1016/j.cattod.2018.05.032 ↗
31. Gold nanoparticle-decorated halloysite nanotubes – selective catalysts for benzyl alcohol oxidation10.1016/j.clay.2017.03.015 ↗
32. Adsorption of volatile organic compounds in Y zeolites and pillared clays10.1016/S1387-1811(01)00207-4 ↗
33. High performance Pd catalysts supported on bimodal mesopore silica for the catalytic oxidation of toluene10.1016/S1872-2067(15)60924-X ↗
34. Total catalytic oxidation of toluene using Pd impregnated on hierarchically porous Nb2O5 and Ta2O5 supports10.1016/j.cattod.2011.10.011 ↗
35. Hydrogenation of nitrobenzene over palladium-supported catalysts—effect of support10.1016/j.apcata.2008.10.044 ↗
36. Boosting toluene combustion by engineering Co–O strength in cobalt oxide catalysts10.1021/acs.est.0c02680 ↗
37. Architectural design of core-shell nanotube systems based on aluminosilicate clay10.1039/D2NA00163B ↗
38. The role of lattice oxygen on the activity and selectivity of the OMS-2 catalyst for the total oxidation of toluene10.1016/j.cej.2015.02.017 ↗
39. Support morphology-dependent catalytic activity of Pd/CeO2 for formaldehyde oxidation10.1021/acs.est.5b01264 ↗
40. Unraveling the effects of the coordination number of Mn over α-MnO2 catalysts for toluene oxidation10.1016/j.cej.2020.125192 ↗
41. Activity of manganese oxides supported on halloysite towards the thermal catalytic oxidation of formaldehyde: Constraint from the manganese precursor
42. Highly dispersed Pd/modified-Al2O3 catalyst on complete oxidation of toluene: Role of basic sites and mechanism insight10.1016/j.apsusc.2019.143747 ↗
43. Mesoporous Cr2O3-supported Au–Pd nanoparticles: high-performance catalysts for the oxidation of toluene10.1016/j.micromeso.2015.11.061 ↗
44. Au–Pd/3DOM Co3O4: Highly active and stable nanocatalysts for toluene oxidation10.1016/j.jcat.2014.09.024 ↗
45. Elements of pulsed corona induced non-thermal plasmas for pollution control and sustainable development10.1016/S0304-3886(01)00116-4 ↗
46. Comparative study of α-, β-, γ- and δ-MnO2 on toluene oxidation: oxygen vacancies and reaction intermediates10.1016/j.apcatb.2019.118150 ↗
47. A self-supporting UiO-66 photocatalyst with Pd nanoparticles for efficient degradation of tetracycline10.1016/j.apsusc.2021.148928 ↗
48. Properties and applications of halloysite nanotubes: recent research advances and future prospects10.1016/j.clay.2015.05.001 ↗
49. Catalytically active silver nanoparticles loaded in the lumen of halloysite nanotubes via electrostatic interactions10.1007/s10853-017-1073-y ↗
50. Effects of acid treatment on the physico-chemical and pore characteristics of halloysite10.1016/j.colsurfa.2011.12.067 ↗
51. The effects of the Pd chemical state on the activity of Pd/Al2O3 catalysts in CO oxidation10.1039/C4CY00552J ↗
52. Applications and interfaces of halloysite nanocomposites10.1016/j.clay.2015.06.034 ↗
53. Zeolitic acidity as a promoter for the catalytic oxidation of toluene over MnO /HZSM-5 catalysts10.1016/j.cattod.2018.03.019 ↗
54. Insights into the size and structural effects of zeolitic supports on gaseous toluene oxidation over MnO /HZSM-5 catalysts10.1016/j.apsusc.2019.04.201 ↗
55. Preparation and intercalation structure model of halloysite-stearic acid intercalation compound10.1016/j.clay.2020.105451 ↗
56. Pd–Co based spinel oxides derived from pd nanoparticles immobilized on layered double hydroxides for toluene combustion10.1016/j.apcatb.2015.08.001 ↗
57. Preparation of Ni, CoO-supported halloysite nanotube catalyst and its application in the hydrogenation of furfural to furfuryl alcohol10.1016/j.clay.2020.105761 ↗