12-Tungstophosphoric acid/zirconia—a highly active stable solid acid—comparison with a tungstated zirconia catalystElectronic supplementary information (ESI) available: W and P analysis in the reaction mixtures. Fig. S1: 31P MAS NMR. Fig. S2: FT-IR pyridine adsorption spectra. Fig. S3: conversion and acidity vs. TPA loading. See http://www.rsc.org/suppdata/cc/b2/b200722c/

2002 ◽  
pp. 1074-1075 ◽  
Author(s):  
Biju M. Devassy ◽  
S. B. Halligudi ◽  
S. G. Hegde ◽  
A. B. Halgeri ◽  
F. Lefebvre
Keyword(s):  
Solid Acid ◽  
Tungstophosphoric Acid ◽  
Mas Nmr ◽  
Supplementary Information ◽  
Pyridine Adsorption ◽  
Tungstated Zirconia ◽  
Highly Active ◽  
Ft Ir ◽  
31P Mas Nmr ◽  
Acid Comparison

scholarly journals Polyoxometalate-MgF2 hybrids as heterogeneous solid acid catalysts for efficient biodiesel production

RSC Advances ◽  
2017 ◽  
Vol 7 (53) ◽  
pp. 33335-33343 ◽  
Author(s):  
Kai-Li Yang ◽  
Shan Huang ◽  
Hu Pan ◽  
Heng Zhang ◽  
Xiao-Fang Liu ◽  
...  
Keyword(s):  
Solid Acid ◽  
Tungstophosphoric Acid ◽  
Biodiesel Production ◽  
Solid Acid Catalysts ◽  
Magnesium Fluoride ◽  
Acid Catalysts ◽  
Highly Active ◽  
Heterogeneous Solid

A series of highly active and stable Keggin heteropolyacid catalysts were prepared through mixing of 12-tungstophosphoric acid (TPA) with magnesium fluoride (MgF2).

scholarly journals New Insights into Keggin-Type 12-Tungstophosphoric Acid from 31P MAS NMR Analysis of Absorbed Trimethylphosphine Oxide and DFT Calculations

2010 ◽  
Vol 6 (1) ◽  
pp. 137-148 ◽  
Author(s):  
Shing-Jong Huang ◽  
Chih-Yi Yang ◽  
Anmin Zheng ◽  
Ningdong Feng ◽  
Ningya Yu ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Tungstophosphoric Acid ◽  
Mas Nmr ◽  
Nmr Analysis ◽  
Keggin Type ◽  
31P Mas Nmr

scholarly journals Nonthermal Plasma Induced Fabrication of Solid Acid Catalysts for Glycerol Dehydration to Acrolein

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 391
Author(s):  
Lu Liu ◽  
Xiaofei Philip Ye
Keyword(s):  
Solid Acid ◽  
Nonthermal Plasma ◽  
Temperature Programmed Desorption ◽  
Argon Atmosphere ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Pyridine Adsorption ◽  
X Ray ◽  
Glycerol Dehydration ◽  
Temperature Programmed

The feasibility of fabricating better solid acid catalysts using nonthermal plasma (NTP) technology for biobased acrolein production is demonstrated. NTP discharge exposure was integrated in catalyst fabrication in air or argon atmosphere. The fabricated catalysts were characterized by Brunauer–Emmett–Teller surface area analysis, temperature-programmed desorption of ammonia, X-ray powder diffraction and Fourier-transform infrared spectroscopy of pyridine adsorption, in comparison to regularly prepared catalysts as a control. Further, kinetic results collected via glycerol dehydration experiments were compared, and improvement in acrolein selectivity was displayed when the catalyst was fabricated in the argon NTP, but not in the air NTP. Possible mechanisms for the improvement were also discussed.

THE USE OF THE COMBINATION OF FTIR, PYRIDINE ADSORPTION, 27Al AND 29Si MAS NMR TO DETERMINE THE BRÖNSTED AND LEWIS ACIDIC SITES

2016 ◽  
Vol 78 (6) ◽  
Author(s):  
Djoko Hartanto ◽  
Lai Sin Yuan ◽  
Sestriana Mutia Sari ◽  
Djarot Sugiarso ◽  
Irmina Kris Murwarni ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Aluminum Atom ◽  
Xrd Analysis ◽  
Acid Sites ◽  
Mas Nmr ◽  
Molar Ratio ◽  
Pyridine Adsorption ◽  
Lewis Acid Sites ◽  
27Al Mas Nmr ◽  
Pre Treatment

Lewis and Brönsted acidity were studied on ZSM-5 with combination of pyridine adsorption and FTIR vibration, ZSM-5 synthesized using kaolin Bangka Indonesia with an increase in the molar ratio of Si/Al 30-60 without pre-treatment and without organic templates and with seeds silicalite. Interestingly, the intensity of the infrared showed an increase of band vibration pyridine as absorbed Brönsted and Lewis acid sites in a molar ratio increase of Si/Al in ZSM-5, indicating an increase in the number of silanol (Brönsted acid) and deformed silica (Lewis acid) because the amount of Aluminum in ZSM-5 decrease with increase Si/Al but amount acidity increase. 29Si and 27Al MAS NMR analysis was supported by the results of infrared to indicate that all of the aluminum atom is coordinated with their neighbors are the same in ordering the ZSM-5 framework and 27Al MAS NMR showed a sharp peak of all the variations of Si/Al except the Si/Al 30 shows a low peak area. XRD analysis supported that the ZSM-5 structure formed is pure and crystal and a decrease in crystallinity proven for more than Si/Al 50, that defects silica occurs in ZSM-5, this corresponds to the growing number of Lewis acid sites caused by defects silica described the infrared results.

Functionalization of α-ZrP by 1,2-Epoxypropane for Further Modification

2017 ◽  
Vol 898 ◽  
pp. 2347-2353
Author(s):  
Ahmed Hossamaldin ◽  
Ping Liu ◽  
Ya Du ◽  
Xiao Ze Jiang ◽  
Bin Sun ◽  
...  
Keyword(s):  
Epoxy Group ◽  
Thermo Gravimetric Analysis ◽  
Mas Nmr ◽  
Interlayer Distance ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Grafting Ratio ◽  
Internal Surfaces ◽  
Carbon Mass ◽  
Ft Ir

To prepare alpha zirconium phosphate (α-ZrP) with high interlayer distance, grafting ratio and thermal stability, 1,2-epoxypropane was used to modify α-ZrP as the epoxy group reacting with P-OH on the external and internal surfaces of α-ZrP to form P-O-C bonds after small amines pre-intercalation. Different characterization techniques were used, including X-ray Powder Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Thermo-Gravimetric Analysis (TGA) and Carbon Mass Nuclear Magnetic Resonance (13C MAS NMR). The results of XRD confirmed the pre-intercalation of amino-propane and the intercalation of 1,2-epoxypropane, as the interlayer distance increased from 7.5 Å to 16.9 Å and 15.3 Å, respectively. FT-IR and 13C MAS NMR results confirmed the formation of P-O-C bonds between 1,2-epoxypropane and α-ZrP. TGA analysis showed that the grafting ratio of 1,2-epoxypropane was 19.44%.

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