A decade+ of operando spectroscopy studies

Chakrabarti, Anisha; Ford, Michael E.; Gregory, Daniel G.; Hu, Rongrong; Keturakis, Christopher J.; Lwin, Soe; Tang, Yadan; Zhou, Yang; Zhu, Minghui; Bañares, Miguel Á.; Wachs, Israel E.

doi:10.1016/j.cattod.2016.12.012

Cited by 132 publications

(100 citation statements)

References 172 publications

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“…[22,25] The deactivation of platinum is discussed to be caused not only by the noble metal oxidation but also by the accumulation of Ncontaining surface species, especially at low temperatures. [38][39][40] This work presents a systematic study of Pt/Al 2 O 3 catalysts for low temperature NH 3 oxidation. However, the number and nature of active sites are ultimately affected by the changes in reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Nature of Active Species of Pt/Al₂O₃ Catalysts for low Temperature NH₃ Oxidation

et al. 2019

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Two series of Pt/γ-Al 2 O 3 catalysts for low temperature NH 3 oxidation were prepared using Pt(NO 3 ) 4 and H 2 PtCl 6 precursors. Using both precursors results in the formation of small Pt particles (d < 1.5 nm), however, Cl-containing Pt precursors give a higher fraction of highly dispersed Pt species. Such species show high stability against thermal or H 2 treatment probably due to the presence of a substantial amount of chlorine on the surface. Treatment of the samples prepared from Pt(NO 3 ) 4 with H 2 leads to the formation of metallic Pt nanoparticles accompanied by the improvement of catalytic activity in NH 3 oxidation at T < 200°C. The main products of ammonia oxidation at temperatures below 250°C were molecular nitrogen and nitrous oxide with the N 2 selectivity reaching 80 %. Operando XANES/ EXAFS revealed that even after H 2 pretreatment at least 40 % of Pt surface remains in oxidized state under reaction conditions resulting in the appearance of N 2 O as a by-product.

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Section: Introductionmentioning

confidence: 99%

Insight into the Nature of Active Species of Pt/Al₂O₃ Catalysts for low Temperature NH₃ Oxidation

et al. 2019

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“…[1][2][3][4][5][6][7][8] Notable examples can be found in recent literature about some industrial catalytic systems that were implemented thanks to the know-how derived from the operando spectroscopic approach. [1][2][3][4][5][6][7][8] Notable examples can be found in recent literature about some industrial catalytic systems that were implemented thanks to the know-how derived from the operando spectroscopic approach.…”

Section: Introductionmentioning

confidence: 99%

Genesis of MgCl₂‐based Ziegler‐Natta Catalysts as Probed with Operando Spectroscopy

et al. 2018

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Ziegler-Natta catalysts for olefin polymerization are intrinsically complex multi-component systems. The genesis of the active sites involves several simultaneous and sequential steps, making the individual steps and interconnections difficult to be unraveled in an unambiguous manner. In this work, we combine X-ray diffraction and spectroscopy to probe each step of the birth and life of a MgCl -based Ziegler-Natta catalyst, namely the formation of high surface area MgCl by dealcoholation of an alcoholate precursor, the TiCl grafting, and the subsequent activation by triethylaluminum as co-catalyst. The so-prepared catalyst was tested towards ethylene polymerization, leading to the production of mainly crystalline high-density polyethylene. The use of operando characterization techniques allowed probing the transient details that are difficult to be dissected in the aftermath, but can radically affect the overall catalytic process.

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“…[1][2][3] However,analogous research with solid-liquid interfaces remains ac hallenge. Recent advances in spectroscopies that operate in situ under catalytic conditions have greatly facilitated the identification of structure-activity correlations in processes involving gaseous reactants and products.…”

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confidence: 99%

Correlation between Chiral Modifier Adsorption and Enantioselectivity in Hydrogenation Catalysis

Gordon

Florisa

et al. 2017

Angew Chem Int Ed

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Infrared absorption spectroscopy performed in situ at the solid-liquid interface revealed that the adsorption on platinum supported catalysts of 1-(1-naphthyl)-ethylamine, which is used as a chiral modifier in hydrogenation catalysis, occurs through the amine group, not the aromatic ring as is widely believed. Comparisons were performed against a set of related modifier compounds with targeted substitutions to help identify the key moiety involved in the adsorption. It was determined that neither naphthalene-based modifiers without amine groups nor those with tertiary amine moieties are capable of adsorbing on the metal surface to any significant extent. A direct correlation was also found between the ability of the amines to adsorb on the platinum surface and their performance as chiral modifiers that impart enantioselectivity to the hydrogenation of α-keto esters such as ethyl pyruvate.

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A decade+ of operando spectroscopy studies

Cited by 132 publications

References 172 publications

Insight into the Nature of Active Species of Pt/Al₂O₃ Catalysts for low Temperature NH₃ Oxidation

Insight into the Nature of Active Species of Pt/Al₂O₃ Catalysts for low Temperature NH₃ Oxidation

Genesis of MgCl₂‐based Ziegler‐Natta Catalysts as Probed with Operando Spectroscopy

Correlation between Chiral Modifier Adsorption and Enantioselectivity in Hydrogenation Catalysis

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A decade+ of operando spectroscopy studies

Cited by 132 publications

References 172 publications

Insight into the Nature of Active Species of Pt/Al2O3 Catalysts for low Temperature NH3 Oxidation

Insight into the Nature of Active Species of Pt/Al2O3 Catalysts for low Temperature NH3 Oxidation

Genesis of MgCl2‐based Ziegler‐Natta Catalysts as Probed with Operando Spectroscopy

Correlation between Chiral Modifier Adsorption and Enantioselectivity in Hydrogenation Catalysis

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Insight into the Nature of Active Species of Pt/Al₂O₃ Catalysts for low Temperature NH₃ Oxidation

Insight into the Nature of Active Species of Pt/Al₂O₃ Catalysts for low Temperature NH₃ Oxidation

Genesis of MgCl₂‐based Ziegler‐Natta Catalysts as Probed with Operando Spectroscopy