Formation of Co2+…(CO)n complexes on high surface area CoO–MgO, as investigated by electron spin resonance

1981 ◽  
Vol 77 (4) ◽  
pp. 811 ◽  
Author(s):  
Valerio Indovina ◽  
Dante Cordischi ◽  
Manlio Occhiuzzi
Keyword(s):  
Electron Spin Resonance ◽  
Surface Area ◽  
Electron Spin ◽  
High Surface ◽  
High Surface Area ◽  
Spin Resonance

Catalysts Examined by Electron Spin Resonance-Examples from Hydrodesulfurization Catalysis

1980 ◽  
Vol 3 ◽  
Author(s):  
Bernard G. Silbernagel
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
High Surface ◽  
High Surface Area ◽  
Chemical Form ◽  
Model Systems ◽  
Catalyst Characterization ◽  
Defect Sites ◽  
Spin Resonance ◽  
Alumina Supports

ABSTRACTThe utility of electron spin resonance (ESR) for catalyst characterization is illustrated for the desulfurization catalysts used to remove sulfur, nitrogen, and organically bound metals from petroleum. These catalysts consist of active metals (Mo, W, Co, Ni) in mixed oxide and sulfide phases on high surface area alumina supports. Coordinated studies of unsupported sulfide and oxide model systems determine the chemical form and number of defect sites on the actual catalysts. Parallel catalysis studies correlate ESR defects and catalytic activity for many reactions.

Amine Modified Magnetic Diatomite Particles as an Effcicent Adsorbent for Pecticide Removal

2021 ◽  
Author(s):  
İhsan Alacabey
Keyword(s):  
Surface Area ◽  
Emerging Contaminants ◽  
High Surface ◽  
High Surface Area ◽  
Scan Ning Electron Microscopy ◽  
Promising Alternative ◽  
Pesticide Removal ◽  
Spin Resonance ◽  
Ft Ir ◽  
Surface Modified

Pesticides are one of the most critical emerging contaminants which are highly toxic for the environment and have potential risk to human health. In this study, surface-modified magnetic diatomite particles (m-DE-APTES) have been suc-cessfully synthesized and used as a sorbent for the removal of endosulfan from an aqueous solution. Magnetic diatomite particles with surface modification were characterized by Fourier transform-infrared spectroscopy (FT-IR), scan-ning electron microscopy (SEM), energy dispersive X-ray (EDX), electron spin resonance (ESR), and surface area measurements. Characterization results sug-gest that magnetic diatomite has a high surface area and porous structure. In addition, m-DE-APTES has higher adsorption capacity (97.2 mg/g) for en-dosulfan pesticide than unmodified diatomite particles (DE) (16.6 mg/g). The adsorption data fit the Langmuir model (R2=0.9905), and the adsorption process took place spontaneously with the values of ΔGo as -2.576. In conclusion, the surface-modified diatomite particles are promising alternative adsorbents for pesticide removal from aqueous solutions.

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