Raman spectroscopy during catalytic operations with on-line activity measurement (operando spectroscopy): a method for understanding the active centres of cations supported on porous materials

Bañares, Miguel Á.; Guerrero‐Pérez, M. Olga; Fierro, J.L.G.; Cortez, G. G.

doi:10.1039/b204494c

Cited by 131 publications

(99 citation statements)

References 40 publications

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“…Such phase forms during propane ammoxidation. This trend of Sb-V-O/ Al 2 O 3 catalysts to form VSbO 4 during reaction has been followed in detail with catalysts prepared with Sb 2 O 3 by operando Raman-GC spectroscopic study [22,34,35]. Deconvolution of the Raman band near 800 cm )1 has shown that it consists of two Raman bands at 835 and 795 cm )1 [22].…”

Section: Al 2 O 3 Supported Sb-v-o Catalystsmentioning

confidence: 99%

Effect of synthesis method on stabilized nano-scaled Sb–V–O catalysts for the ammoxidation of propane to acrylonitrile

2006

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A new synthesis method to prepare V-Sb-O phases on Al 2 O 3 , and Nb 2 O 5 substrates has been investigated and compared with previous works in which a conventional synthesis method was used. The new preparation method leads to an amorphous layer of Sb oxide, which had not been described previously; its Raman bands are reported for the first time. This new method provides an intimate contact between Sb and V during synthesis. It has a clear influence on the structure and catalytic properties of the final catalysts. The total amount (Sb + V), the Sb/V atomic ratio, and the specific support determine acrylonitrile production. Depending on catalyst stoichiometry, different preparation methods are preferred. Standard Sb 2 O 3 suspension method is preferred at Sb/V atomic ratios above 1. The new tartrate method is preferred at Sb/V = 1 atomic ratio, resulting in the best catalytic performance.

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Section: Al 2 O 3 Supported Sb-v-o Catalystsmentioning

confidence: 99%

Effect of synthesis method on stabilized nano-scaled Sb–V–O catalysts for the ammoxidation of propane to acrylonitrile

2006

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“…On roughly the same sort of timescales we have seen a much keener effort on many sides to observe catalytic systems, whether they be models based upon metal or oxide surfaces, or real catalysts operating at high pressures and temperature, under well-defined conditions that are parameterized according to the processes under study, and in a fashion that gets as close as possible to that situation that Banares [71,72] coined as "operando". For sure approaches that sought to do this predated the term, but the idea has acted as a considerable stimulus to the development of new methods and combinations of methods-that are not only efficient but internally self-consistent-that attempt to attain this ideal; and to do so they have required the effective collaboration of a very diverse array of people and knowledge bases.…”

Section: Discussionmentioning

confidence: 99%

“…As such they have become ideal resources for the development of operando philosophy that Banares and co-workers introduced in 2002 [71,72] as a method to properly establish relevant Quantitative Structure-Reactivity relationships (QSARS) in catalysis: structurally direct X-ray techniques being highly complementary partners to global assessments of catalytic performance (e.g., MS) or laboratory based spectroscopies sensitive to chemical speciation (e.g., infrared (DRIFTS [73][74][75][76][77][78][79], transmission IR [80,81]) or Raman spectroscopies [82][83][84][85][86][87], for reviews see [88][89][90][91]). …”

Section: Introductionmentioning

confidence: 99%

Time Resolved Operando X-ray Techniques in Catalysis, a Case Study: CO Oxidation by O2 over Pt Surfaces and Alumina Supported Pt Catalysts

Newton

2017

Catalysts

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Abstract:The catalytic oxidation of CO by O 2 to form CO 2 over Pt surfaces and supported catalysts is one of the most studied catalytic reactions from both fundamental and applied points of view. This review aims to show how the application of a range of time resolved, X-ray based techniques, such as X-ray diffraction (XRD), Surface X-ray diffraction (SXRD), total X-ray scattering/pair distribution function (PDF), X-ray absorption (XAFS), X-ray emission (XES), and X-ray photoelectron spectroscopies (XPS), applied under operando conditions and often coupled to adjunct techniques (for instance mass spectrometry (MS) and infrared spectroscopy (IR)) have shed new light on the structures and mechanisms at work in this most studied of systems. The aim of this review is therefore to demonstrate how a fusion of the operando philosophy with the ever augmenting capacities of modern synchrotron sources can lead to new insight and catalytic possibilities, even in the case of a process that has been intensely studied for almost 100 years.

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“…Simultaneous measurements of the reactants and products through MS/GC must also be made to understand the Catalysts 2017, 7, 109 3 of 15 whole reaction phenomena. The term operando (Latin word for 'working') was coined by Miguel Bañares in 2002 and operando spectroscopy/microscopy combines an in situ cell with simultaneous online product analysis [19]. In these in situ and operando applications, the analytical techniques used to analyze surface and bulk catalyst structures, adsorbates, and intermediates include both spectroscopy (Raman, IR, UV-VIS, XAS, XRD, LEIS, XPS, EPR, NMR, neutron diffraction, etc.)…”

Section: Operando Techniquesmentioning

confidence: 99%

Characterization of MoVTeNbOx Catalysts during Oxidation Reactions Using In Situ/Operando Techniques: A Review

et al. 2017

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Light alkanes are abundant in shale gas resources. The bulk mixed metal oxide MoVTe(Sb)NbO x catalysts play a very important role in dehydrogenation and selective oxidation reactions of these short hydrocarbons to produce high-value chemicals. This catalyst system mainly consists of M1 and less-active M2 crystalline phases. Due to their ability to directly monitor the catalysts under the relevant industrial conditions, in situ/operando techniques can provide information about the nature of active sites, surface intermediates, and kinetics/mechanisms, and may help with the synthesis of new and better catalysts. Sophisticated catalyst design and understanding is necessary to achieve the desired performance (activity, selectivity, lifetime, etc.) at reasonable reaction conditions (temperature, pressure, etc.). This article critically reviews the progress made in research of these MoVTe(Sb)NbO x catalysts in oxidation reactions mainly through in situ/operando techniques and suggests the future direction needed to realize the industrialization of these catalysts.

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Raman spectroscopy during catalytic operations with on-line activity measurement (operando spectroscopy): a method for understanding the active centres of cations supported on porous materials

Cited by 131 publications

References 40 publications

Effect of synthesis method on stabilized nano-scaled Sb–V–O catalysts for the ammoxidation of propane to acrylonitrile

Effect of synthesis method on stabilized nano-scaled Sb–V–O catalysts for the ammoxidation of propane to acrylonitrile

Time Resolved Operando X-ray Techniques in Catalysis, a Case Study: CO Oxidation by O2 over Pt Surfaces and Alumina Supported Pt Catalysts

Characterization of MoVTeNbOx Catalysts during Oxidation Reactions Using In Situ/Operando Techniques: A Review

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