Influence of active phase composition (Mn, Ni, Mn x Ni 10−x ) on catalytic properties and performance of clinoptilolite supported nanocatalysts synthesized using ultrasound energy toward abatement of toluene from polluted air

Ahmadi, Maryam; Haghighi, Mohammad; Kahforoushan, Davood

doi:10.1016/j.psep.2016.06.029

Cited by 14 publications

(11 citation statements)

References 77 publications

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“…Likewise, natural zeolites have recently been employed for air pollution control [13,14], mainly motivated by their low cost, high availability, and the presence of active acid sites [15]. Such studies have focused on the removal of sulphur dioxide from combustion gases [16], the removal of VOCs (via adsorption) [17,18], the regeneration of toluene-saturated natural zeolites (via ozonation) [19], and the catalytic oxidation of toluene [20,21].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Ozonation of Toluene Using Chilean Natural Zeolite: The Key Role of Brønsted and Lewis Acid Sites

et al. 2018

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Abstract:The influence of surface physical-chemical characteristics of Chilean natural zeolite on the catalytic ozonation of toluene is presented in this article. Surface characteristics of natural zeolite were modified by acid treatment with hydrochloric acid and ion-exchange with ammonium sulphate. Prior to catalytic ozonation assays, natural and chemically modified zeolite samples were thermally treated at 623 and 823 K in order to enhance Brønsted and Lewis acid sites formation, respectively. Natural and modified zeolite samples were characterised by N 2 adsorption at 77 K, elemental analysis, X-ray fluorescence, and Fourier transform infrared (FTIR) spectroscopy, using pyridine as a probe molecule. The highest values of the reaction rate of toluene oxidation were observed when NH4Z1 and 2NH4Z1 zeolite samples were used. Those samples registered the highest density values of Lewis acid sites compared to other samples used here. Results indicate that the presence of strong Lewis acid sites at the 2NH4Z1 zeolite surface causes an increase in the reaction rate of toluene oxidation, confirming the role of Lewis acid sites during the catalytic ozonation of toluene at room temperature. Lewis acid sites decompose gaseous ozone into atomic oxygen, which reacts with the adsorbed toluene at Brønsted acid sites. On the other hand, no significant contribution of Brønsted acid sites on the reaction rate was registered when NH4Z1 and 2NH4Z1 zeolite samples were used.

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Section: Introductionmentioning

confidence: 99%

Catalytic Ozonation of Toluene Using Chilean Natural Zeolite: The Key Role of Brønsted and Lewis Acid Sites

et al. 2018

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“…In agriculture and horticulture, clinoptilolite has been used as a slow releasing carrier of fertilizers, insecticides, pesticides, antibacterial agents, and growth stimulators [ 9 ]. This kind of material is frequently used in environmental technology to remove heavy metals [ 10 , 11 ], dyes, and surfactants [ 12 ] from water or to eliminate toxic gasses [ 13 ]. Moreover, clinoptilolite can be used for producing antidiarrheal [ 14 ] and antiviral drugs [ 8 ], anticancer therapy [ 15 ], and drug carriers [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Modification of Clinoptilolite

et al. 2017

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Clinoptilolite is a natural mineral with exceptional physical characteristics resulting from its special crystal structure, mainstreamed into a large zeolite group called heulandites. An overall view of the research related to the synthesis, modification and application of synthetic clinoptilolite is presented. A single phase of clinoptilolite can be hydrothermally synthesized for 1–10 days in an autoclave from various silica, alumina, and alkali sources with initial Si/Al ratio from 3.0 to 5.0 at a temperature range from 120 to 195 °C. Crystallization rate and crystallinity of clinoptilolite can be improved by seeding. The modification of clinoptilolite has received noticeable attention from the research community, since modified forms have specific properties and therefore their area of application has been broadening. This paper provides a review of the use of organic compounds such as quarter alkyl ammonium, polymer, amine and inorganic species used in the modification process, discusses the processes and mechanisms of clinoptilolite modification, and identifies research gaps and new perspectives.

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“…Furthermore, the catalyst appeared as active as conventional synthetic zeolites ZSM-5 and Beta. In another study (Ahmadi et al, 2017), the Mn and Ni were loaded on clinoptilolite by sonochemical method and the presence of single and mixed metal oxide nanoparticles was confirmed. Furthermore, the catalytic tests for total toluene oxidation revealed that bimetallic oxides on clinoptilolite support had lower temperature activity compared to monometallic ones and the Mn7%Ni3%/clinoptilolite sample showed the best performance.…”

Section: Introductionmentioning

confidence: 92%

“…In most of the studies the metal loading was optimized to obtain highly active metal-oxo-species on zeolite support. The tested systems were single metal oxides (Mn, Co., Fe, Cu) supported on clinoptilolite (Ozcelik et al, 2009;Soylu et al, 2010;Russo et al, 2018a;Russo et al, 2018b), bimetal oxides (Mn/Ni, Fe/Cu) supported on clinoptilolite (Ahmadi et al, 2017;Rostami and Jonidi Jafari, 2014) and single metals (Mn, Cu, Ni) supported on CeO 2 -clinoptilolite systems (Yosefi et al, 2015a;Yosefi et al, 2015b;Yosefi et al, 2015c). The catalysts prepared by incipient wetness impregnation of clinoptilolite in hydrogen form, which resulted in 9.5% MnO 2 on clinoptilolite, exhibited the highest performance among different oxides in comparison with Fe, Cu and Co-oxides on the same support (Soylu et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Utilisation of waste Cu-, Mn- and Fe-loaded zeolites generated after wastewater treatment as catalysts for air treatment

et al. 2022

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Disposal of copper, manganese and iron is particularly problematic in wastewater of metallurgical and galvanization plants, the electronics industry and agriculture. On the other hand, volatile organic compounds (VOCs), emitted from industrial processes, transportation and consumer products are the main class of air pollutants. The study revealed the potential of waste metal-loaded zeolite, generated through wastewater treatment procedures, to be utilised as an effective VOC removal catalyst for air treatment. In the first step, we have evaluated the sorption performance of natural zeolite clinoptilolite (HEU type), and synthetic zeolite 4A (LTA type) for the simultaneous removal of Cu2+, Mn2+ and Fe3+ species from aqueous solution. By a detailed sorption study, we determined the optimum sorption conditions and maximum metal concentrations in wastewater that can be after treatment disposed of in rivers or municipal plants. The efficiency of both zeolites for metal immobilization was demonstrated for concentrations up to 5 mg metals/1 g zeolite. These waste Cu-, Mn- and Fe-loaded zeolites were thermally treated at 540 °C before the second step, where we evaluated their catalytic performance in removing VOC. The thermally treated waste Cu-, Mn- and Fe-loaded natural zeolite clinoptilolite showed good catalytic performance in total toluene oxidation as a model VOC (conversion rate up to 96% at 510°C) and cycling stability (less than 15% drop in conversion rate in 4 h). In contrast, this is not the case for thermally treated waste Cu-, Mn- and Fe-loaded synthetic zeolite 4A.

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Influence of active phase composition (Mn, Ni, Mn x Ni 10−x ) on catalytic properties and performance of clinoptilolite supported nanocatalysts synthesized using ultrasound energy toward abatement of toluene from polluted air

Cited by 14 publications

References 77 publications

Catalytic Ozonation of Toluene Using Chilean Natural Zeolite: The Key Role of Brønsted and Lewis Acid Sites

Catalytic Ozonation of Toluene Using Chilean Natural Zeolite: The Key Role of Brønsted and Lewis Acid Sites

Synthesis and Modification of Clinoptilolite

Utilisation of waste Cu-, Mn- and Fe-loaded zeolites generated after wastewater treatment as catalysts for air treatment

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