Influence of transition metals on the surface acidic properties of titania prepared by sol–gel route

Shali, N.B.; Sugunan, S.

doi:10.1016/j.materresbull.2006.11.016

Cited by 23 publications

(10 citation statements)

References 19 publications

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“…The base sites are usually probed by the adsorption of CO 2 , since carbon dioxide has almost no redox behavior and does not undergo undesirable side reactions at the metal oxides surfaces. The strength and quantity of adsorption can be measured by spectrophotometric titration in presence of indicators, thermal desorption spectrometry (TDS), temperature programmed desorption (TPD) [147][148][149]. The strength of acid sites is characterized by a Hammett parameter (H 0 ) related to acidity constant (K a ) of the indicator: H 0 = pK a − lg{a(IH + )/a(I), where IH + and I are the concentrations of protonated and deprotonated forms of the indicator.…”

Section: Conflicts Of Interestmentioning

confidence: 99%

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Marikutsa

Rumyantseva

Константинова

et al. 2021

Sensors

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Development of sensor materials based on metal oxide semiconductors (MOS) for selective gas sensors is challenging for the tasks of air quality monitoring, early fire detection, gas leaks search, breath analysis, etc. An extensive range of sensor materials has been elaborated, but no consistent guidelines can be found for choosing a material composition targeting the selective detection of specific gases. Fundamental relations between material composition and sensing behavior have not been unambiguously established. In the present review, we summarize our recent works on the research of active sites and gas sensing behavior of n-type semiconductor metal oxides with different composition (simple oxides ZnO, In2O3, SnO2, WO3; mixed-metal oxides BaSnO3, Bi2WO6), and functionalized by catalytic noble metals (Ru, Pd, Au). The materials were variously characterized. The composition, metal-oxygen bonding, microstructure, active sites, sensing behavior, and interaction routes with gases (CO, NH3, SO2, VOC, NO2) were examined. The key role of active sites in determining the selectivity of sensor materials is substantiated. It was shown that the metal-oxygen bond energy of the MOS correlates with the surface acidity and the concentration of surface oxygen species and oxygen vacancies, which control the adsorption and redox conversion of analyte gas molecules. The effects of cations in mixed-metal oxides on the sensitivity and selectivity of BaSnO3 and Bi2WO6 to SO2 and VOCs, respectively, are rationalized. The determining role of catalytic noble metals in oxidation of reducing analyte gases and the impact of acid sites of MOS to gas adsorption are demonstrated.

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Section: Conflicts Of Interestmentioning

confidence: 99%

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Marikutsa

Rumyantseva

Константинова

et al. 2021

Sensors

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“…Figure 2 shows the NH 3 -TPD profiles of the catalysts. The profiles for all catalysts show two peaks, namely, the strong acid desorption peak (400-650 • C) and the weak-medium acid desorption peak (100-400 • C) (Shali and Suguman, 2007). The strong acid amount of PCA-M is 3.2 times than that of PCA-V and 1.5 times than that of PCZA-M.…”

Section: Nh 3 -Tpd Resultsmentioning

confidence: 94%

Cracking Performance of Supercritical n-Decane with Mo-promoted Pt/CeO₂-Al₂O₃Catalysts

Zhu

Wang

et al. 2015

Petroleum Science and Technology

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PCZA-M) are investigated using n-decane cracking in a plug flow reactor. The catalytic cracking activities of the catalysts are found to increase with the order of the strong acid amount: PCA-M > PCZA-M > PCA-V. Hence, it is concluded that the larger the strong acid amount the better the cracking activities. The gas yield of PCA-M increase by 5.8% at 700 • C compared to that of PCA-V, and its heat sink increases by 0.17 MJ/kg correspondingly. PCA-M has the greatest effects on the gas yields and heat sinks.

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“…This can be attributed to the enhanced amount of acidic sites present in the catalyst systems. Molybdenum incorporated systems are having comparatively high abundance of Bronsted acid sites [25]. The catalyst was easily separated from the reaction mixture by simple filtration.…”

Section: Resultsmentioning

confidence: 99%

Tetrahydropyranylation of Alcohols over Modified Zeolites

et al. 2009

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Influence of transition metals on the surface acidic properties of titania prepared by sol–gel route

Cited by 23 publications

References 19 publications

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Cracking Performance of Supercritical n-Decane with Mo-promoted Pt/CeO₂-Al₂O₃Catalysts

Tetrahydropyranylation of Alcohols over Modified Zeolites

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Influence of transition metals on the surface acidic properties of titania prepared by sol–gel route

Cited by 23 publications

References 19 publications

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Cracking Performance of Supercritical n-Decane with Mo-promoted Pt/CeO2-Al2O3Catalysts

Tetrahydropyranylation of Alcohols over Modified Zeolites

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Product

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Cracking Performance of Supercritical n-Decane with Mo-promoted Pt/CeO₂-Al₂O₃Catalysts