Role of the Surface Lewis Acid and Base Sites in the Adsorption of CO2 on Titania Nanotubes and Platinized Titania Nanotubes: An in Situ FT-IR Study

2013 ◽  
Vol 117 (24) ◽  
pp. 12661-12678 ◽  
Author(s):  
Kaustava Bhattacharyya ◽  
Alon Danon ◽  
Baiju K.Vijayan ◽  
Kimberly A. Gray ◽  
Peter C. Stair ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Titania Nanotubes ◽  
Acid And Base ◽  
Ft Ir ◽  
Ir Study ◽  
Adsorption Of Co2 ◽  
Lewis Acid And Base

The role of platinum on the NOx storage and desorption behavior of ceria: An online FT-IR study combined with in situ Raman and UV-Vis spectroscopy

2020 ◽  
Author(s):  
Anastasia Filtschew ◽  
Pablo Beato ◽  
Søren Birk Rasmussen ◽  
Christian Hess
Keyword(s):  
Gas Phase ◽  
Phase Analysis ◽  
Room Temperature ◽  
Storage Mechanism ◽  
In Situ Raman ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Ir Study

The role of platinum on the room temperature NOx storage mechanism and the NOx desorption behavior of ceria was investigated by combining online FT-IR gas-phase analysis with in situ Raman...

The dual role of halogen, chalcogen, and pnictogen atoms as Lewis acid and base: Triangular XBr:SHX:PH2 X complexes (X = F, Cl, Br, CN, NC, OH, NH2 , and OCH3 )

2015 ◽  
Vol 115 (22) ◽  
pp. 1580-1586 ◽  
Author(s):  
Mehdi D. Esrafili ◽  
Fariba Mohammadian-Sabet ◽  
Mohammad Mehdi Baneshi
Keyword(s):  
Lewis Acid ◽  
Dual Role ◽  
Acid And Base ◽  
Lewis Acid And Base

The dual role of pnicogen as Lewis acid and base and the unexpected interplay between the pnicogen bond and coordination interaction in H3N⋯FH2X⋯MCN (X = P and As; M = Cu, Ag, and Au)

2015 ◽  
Vol 39 (3) ◽  
pp. 2067-2074 ◽  
Author(s):  
Hongying Zhuo ◽  
Qingzhong Li ◽  
Wenzuo Li ◽  
Jianbo Cheng
Keyword(s):  
Lewis Acid ◽  
Binary Systems ◽  
Ternary Systems ◽  
Dual Role ◽  
Coordination Interaction ◽  
Pnicogen Bond ◽  
Acid And Base ◽  
Lewis Acid And Base

Ternary systems H3N⋯FH2X⋯MCN (X = P and As; M = Cu, Ag, and Au) as well as the corresponding pnicogen-bonded and coordination-bonded binary systems have been studied.

scholarly journals Lewis acid / Base-free Strategy for the Synthesis of 2-Arylthio and Selenyl Benzothiazole / Thiazole and Imidazole

2021 ◽  
Vol 27 (1) ◽  
pp. 17-23
Author(s):  
Guniganti Balakishan ◽  
Gullapalli Kumaraswamy ◽  
Vykunthapu Narayanarao ◽  
Pagilla Shankaraiah
Keyword(s):  
Lewis Acid ◽  
Bond Formation ◽  
Acid Base ◽  
Mechanistic Pathway ◽  
Wide Range ◽  
Acid And Base ◽  
Lewis Acid And Base ◽  
Sulfur Bond

Abstract A Cu(II)-catalyzed Csp2-Se and Csp2-Sulfur bond formation was achieved with moderate to good yields without the aid of Lewis acid and base. The reaction is compatible with a wide range of heterocycles such as benzothiazole, thiazole, and imidazole. Also, this typical protocol is found to be active in thio-selenation via S-H activation. Additionally, we proposed a plausible mechanistic pathway involving Cu(III) putative intermediate.

scholarly journals Experimental and Theoretical Studies of Sonically Prepared Cu–Y, Cu–USY and Cu–ZSM-5 Catalysts for SCR deNOx

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 824
Author(s):  
Przemysław J. Jodłowski ◽  
Izabela Czekaj ◽  
Patrycja Stachurska ◽  
Łukasz Kuterasiński ◽  
Lucjan Chmielarz ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Ultrasonic Irradiation ◽  
Active Phase ◽  
Spectroscopic Studies ◽  
In Situ Drifts ◽  
Ft Ir ◽  
Diffuse Reflectance Infrared ◽  
Experimental And Theoretical Studies

The objective of our study was to prepare Y-, USY- and ZSM-5-based catalysts by hydrothermal synthesis, followed by copper active-phase deposition by either conventional ion-exchange or ultrasonic irradiation. The resulting materials were characterized by XRD, BET, SEM, TEM, Raman, UV-Vis, monitoring ammonia and nitrogen oxide sorption by FT-IR and Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). XRD data confirmed the purity and structure of the Y/USY or ZSM-5 zeolites. The nitrogen and ammonia sorption results indicated that the materials were highly porous and acidic. The metallic active phase was found in the form of cations in ion-exchanged zeolites and in the form of nanoparticle metal oxides in sonochemically prepared catalysts. The latter showed full activity and high stability in the SCR deNOx reaction. The faujasite-based catalysts were fully active at 200–400 °C, whereas the ZSM-5-based catalysts reached 100% activity at 400–500 °C. Our in situ DRIFTS experiments revealed that Cu–O(NO) and Cu–NH3 were intermediates, also indicating the role of Brønsted sites in the formation of NH4NO3. Furthermore, the results from our experimental in situ spectroscopic studies were compared with DFT models. Overall, our findings suggest two possible mechanisms for the deNOx reaction, depending on the method of catalyst preparation (i.e., conventional ion-exchange vs. ultrasonic irradiation).

Combined theoretical and experimental study on alcoholysis of amides on CeO2 surface: A catalytic interplay between Lewis acid and base sites

2018 ◽  
Vol 303 ◽  
pp. 256-262 ◽  
Author(s):  
Takashi Kamachi ◽  
S.M.A. Hakim Siddiki ◽  
Yoshitsugu Morita ◽  
Md. Nurnobi Rashed ◽  
Kenichi Kon ◽  
...  
Keyword(s):  
Experimental Study ◽  
Lewis Acid ◽  
Acid And Base ◽  
Lewis Acid And Base

Stability and Selectivity of Au/TiO2 and Au/TiO2/SiO2 Catalysts in Propene Epoxidation: An in Situ FT-IR Study

2001 ◽  
Vol 201 (1) ◽  
pp. 128-137 ◽  
Author(s):  
Guido Mul ◽  
Aalbert Zwijnenburg ◽  
Bart van der Linden ◽  
Michiel Makkee ◽  
Jacob A Moulijn
Keyword(s):  
Ft Ir ◽  
Ir Study

Stereo- and Temporally Controlled Coordination Polymerization Triggered by Alternating Addition of a Lewis Acid and Base

2016 ◽  
Vol 55 (39) ◽  
pp. 11975-11978 ◽  
Author(s):  
Bo Liu ◽  
Dongmei Cui ◽  
Tao Tang
Keyword(s):  
Lewis Acid ◽  
Coordination Polymerization ◽  
Acid And Base ◽  
Lewis Acid And Base
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