ChemInform Abstract: NATURE OF CATALYTICALLY ACTIVE SITES OVER SOLID ACIDS. I. SELECTIVE POISONING G OF LEWIS ACID SITES ON SILICA-ALUMINA WITH PYRIDINE AND ITS APPLICATION TO OLEFIN POLYMERIZATION

1976 ◽  
Vol 7 (42) ◽  
pp. no-no
Author(s):  
KOICHI MIZUNO ◽  
MASANORI IKEDA ◽  
TOSHIAKI IMOKAWA ◽  
JUN-ICHIRO TAKE ◽  
YUKIO YONEDA
Keyword(s):  
Lewis Acid ◽  
Active Sites ◽  
Olefin Polymerization ◽  
Acid Sites ◽  
Solid Acids ◽  
Lewis Acid Sites ◽  
Catalytically Active ◽  
Silica Alumina

The role of weak Lewis acid sites for methanol thiolation

2019 ◽  
Vol 9 (2) ◽  
pp. 509-516 ◽  
Author(s):  
Manuel Weber-Stockbauer ◽  
Oliver Y. Gutiérrez ◽  
Ricardo Bermejo-Deval ◽  
Johannes A. Lercher
Keyword(s):  
Lewis Acid ◽  
Active Sites ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Strong Base

Weak Lewis acid sites combined with strong base sites of Cs+ supported on WS2 and γ-Al2O3 are the active sites in the thiolation of methanol.

scholarly journals Adsorption of Phosphate on Synthetic Silica–Alumina Possessing Lewis-acid Sites

1977 ◽  
Vol 50 (9) ◽  
pp. 2479-2480 ◽  
Author(s):  
Kazuto Takimoto ◽  
Akira Fujita ◽  
Satoru Tsuda
Keyword(s):  
Lewis Acid ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Silica Alumina

Methanol to Gasoline Conversion over CuO/ZSM-5 Catalyst Synthesized Using Sonochemistry Method

2018 ◽  
Vol 17 (2) ◽  
Author(s):  
Ehsan Kianfar ◽  
Mahmoud Salimi ◽  
Saeed Hajimirzaee ◽  
Behnam Koohestani
Keyword(s):  
Copper Oxide ◽  
Lewis Acid ◽  
Active Sites ◽  
Fixed Bed ◽  
Acid Sites ◽  
High Specific Surface Area ◽  
Fixed Bed Reactor ◽  
Lewis Acid Sites ◽  
Hydrocarbon Production ◽  
Methanol To Gasoline

Abstract In this research, the catalytic conversion of methanol to gasoline range hydrocarbons has been studied over CuO (5 %)/ZSM-5 and CuO (7 %)/ZSM-5 catalysts prepared via sonochemistry methods. Conversion of methanol to gasoline (MTG) has been carried out in a fixed bed reactor under atmospheric pressure and 400˚C temperature, over copper oxide on the synthesized ZSM-5 catalyst. The samples were characterized by XRD, SEM, TEM, BET, and FTIR techniques; in which good crystallinity and high specific surface area of synthesized zeolite were proved after impregnation of zeolite with copper. The present investigation suggests that the CuO/ZSM-5 catalyst made by sonochemistry method can increase the yield toward hydrocarbon production. It was concluded that impregnation of zeolite with copper oxide can alter the Brønsted/Lewis acid sites ratio and provide new Lewis acid sites over the surface of the ZSM-5. The main products of methanol to gasoline reaction over the catalyst that prepared via sonochemistry method were toluene, xylene, ethylbenzene, ethyl toluene, tetra methylbenzene, diethyl benzene and butylbenzene. The total amount of aromatics in the products was 80 % by using this catalyst. Our results suggest that catalyst synthesized by using sonochemistry shows better production yield toward hydrocarbons by affecting the distribution of active sites on the surface of the ZSM-5.

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.

Water Resistant, Catalytically Active Nb and Ta Isolated Lewis Acid Sites, Homogeneously Distributed by Direct Synthesis in a Beta Zeolite

2009 ◽  
Vol 113 (26) ◽  
pp. 11306-11315 ◽  
Author(s):  
Avelino Corma ◽  
Francesc X. Llabrés i Xamena ◽  
Carmelo Prestipino ◽  
Michael Renz ◽  
Susana Valencia
Keyword(s):  
Lewis Acid ◽  
Direct Synthesis ◽  
Acid Sites ◽  
Beta Zeolite ◽  
Lewis Acid Sites ◽  
Catalytically Active

Methyltrioxorhenium Interactions with Lewis Acid Sites of an Amorphous Silica−Alumina

2006 ◽  
Vol 25 (9) ◽  
pp. 2157-2165 ◽  
Author(s):  
Anthony W. Moses ◽  
Naseem A. Ramsahye ◽  
Christina Raab ◽  
Heather D. Leifeste ◽  
Swarup Chattopadhyay ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Amorphous Silica ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Silica Alumina
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