scholarly journals Effect of iridium loading on the formation of protonic acid sites over Ir/Pt-HZSM5

2013 ◽  
Vol 9 (1) ◽  
Author(s):  
S. Triwahyono ◽  
H.D. Setiabudi ◽  
A.A. Jalil ◽  
S.N. Timmiati ◽  
N.H.R. Annuar ◽  
...  
Keyword(s):  
Ftir Spectroscopy ◽  
Lewis Acid ◽  
Esr Spectroscopy ◽  
Acid Sites ◽  
Acidic Properties ◽  
Lewis Acid Sites ◽  
Brønsted Acid Sites ◽  
Protonic Acid ◽  
Concomitant Decrease ◽  
Brønsted And Lewis Acid

The Ir/Pt-HZSM5 with different iridium loading (0.3-1.0 wt%) was prepared by impregnation of iridium on Pt-HZSM5. The acidic properties of Ir/Pt-HZSM5 were studied by FTIR spectroscopy, while the activity of the catalysts was tested for n-pentane isomerization in a microcatalytic pulse reactor.The IR results of adsorbed 2,6-lutidine showed that all catalysts possessed strong Brönsted and Lewis acid sites in the outgassing at 473 K and below.When Ir/Pt-HZSM5 was heated in hydrogen, protonic acid sites were formed with concomitant decrease of Lewis acid sites. An increase in iridiumloading continuously decreased the Lewis and Brönsted acid sites and inhibited the formation of protonic acid sites induced by hydrogen. The formationof protonic acid sites induced by hydrogen was also confirmed by the formation of electron detected by ESR spectroscopy. Additionally for n-pentaneisomerization, an increase in iridium loading decreased the yield of isopentane due to the inhibition in the formation of protonic acid sites via hydrogenspillover phenomenon.

One-pot transformation of furfural into γ-valerolactone catalyzed by hierarchical Hf-Al-USY zeolite with balanced Lewis and Brønsted acid sites

2021 ◽  
Author(s):  
Bo Tang ◽  
Shuang Li ◽  
Wei-Chao Song ◽  
Yan Li ◽  
En-Cui Yang
Keyword(s):  
Lewis Acid ◽  
Value Added ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Lewis Acid Sites ◽  
One Pot ◽  
Usy Zeolite ◽  
Brønsted Acid Sites ◽  
Brönsted Acid ◽  
Brønsted And Lewis Acid

Upgrading of furfural to high value-added chemicals are currently an attractive and challenging route in biorefineries. Herein, hierarchically structured bifunctional Hf-Al-USY zeolite with balanced Brønsted and Lewis acid sites has...

On the nature of framework Brønsted and Lewis acid sites in ZSM-5

Zeolites ◽  
1997 ◽  
Vol 19 (4) ◽  
pp. 288-296 ◽  
Author(s):  
G.L. Woolery ◽  
G.H. Kuehl ◽  
H.C. Timken ◽  
A.W. Chester ◽  
J.C. Vartuli
Keyword(s):  
Lewis Acid ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Brønsted And Lewis Acid

Enhancing Brønsted and Lewis Acid Sites of the Utilized Spent RFCC Catalyst Waste for the Continuous Cracking Process of Palm Oil to Biofuels

2020 ◽  
Vol 59 (20) ◽  
pp. 9459-9468 ◽  
Author(s):  
I. Istadi ◽  
Teguh Riyanto ◽  
Luqman Buchori ◽  
Didi Dwi Anggoro ◽  
G. Gilbert ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Palm Oil ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Cracking Process ◽  
Brønsted And Lewis Acid

High activity of aluminated bifunctional mesoporous silica nanoparticles for cumene hydrocracking and measurement of molar absorption coefficient

2015 ◽  
Vol 39 (10) ◽  
pp. 8006-8016 ◽  
Author(s):  
Mohammad Reza Sazegar ◽  
Sugeng Triwahyono ◽  
Aishah Abdul Jalil ◽  
Rino R. Mukti ◽  
Seyed Mohammad Seyed Mohaghegh ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Absorption Coefficient ◽  
Silica Nanoparticles ◽  
High Activity ◽  
Lewis Acid ◽  
Mesoporous Silica Nanoparticles ◽  
Acid Sites ◽  
Molar Absorption Coefficient ◽  
Lewis Acid Sites ◽  
Brønsted And Lewis Acid

Pt/HAlMSN synthesized with Si/Al ratios = 7–50 showed high activity in cumene hydrocracking due to the Brønsted and Lewis acid sites.

Time-resolved observation of V2O5/TiO2 in NH3-SCR reveals the equivalence of Brønsted and Lewis acid sites

2020 ◽  
Vol 56 (98) ◽  
pp. 15450-15453
Author(s):  
Inhak Song ◽  
Hwangho Lee ◽  
Se Won Jeon ◽  
Taejin Kim ◽  
Do Heui Kim
Keyword(s):  
Lewis Acid ◽  
Catalytic Reaction ◽  
Reaction Rates ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Time Resolved ◽  
Nh3 Scr ◽  
Brønsted And Lewis Acid

Reaction rates of Lewis-NH3 and Brønsted-NH3 species were measured to be equivalent in the selective catalytic reaction over V2O5/TiO2 catalyst.

scholarly journals Solid Acids for the Reaction of Bioderived Alcohols into Ethers for Fuel Applications

Catalysts ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 172 ◽  
Author(s):  
Federica Zaccheria ◽  
Nicola Scotti ◽  
Nicoletta Ravasio
Keyword(s):  
Physical Properties ◽  
Lignocellulosic Biomass ◽  
Lewis Acid ◽  
Product Distribution ◽  
Acid Sites ◽  
Solid Acids ◽  
Lewis Acid Sites ◽  
Hydroxymethyl Furfural ◽  
Brønsted And Lewis Acid

The use of solids acids in the synthesis of ethers suitable to be used as fuels or fuel additives were reviewed in a critical way. In particular, the role of Brønsted and Lewis acid sites was highlighted to focus on the pivotal role of the acidity nature on the product distribution. Particular emphasis is given to the recently proposed ethers prepared starting from furfural and 5-hydroxymethyl furfural. Thus, they are very promising products that can be derived from lignocellulosic biomass and bioalcohols and possess very interesting chemical and physical properties for their use in the diesel sector.

Sign in / Sign up

Export Citation Format

Share Document