Selective Introduction of Acid Sites in Different Confined Positions in ZSM-5 and Its Catalytic Implications

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F18%3A00506544" target="_blank" >RIV/61388955:_____/18:00506544 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/11104/0297775" target="_blank" >http://hdl.handle.net/11104/0297775</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acscatal.8b02112" target="_blank" >10.1021/acscatal.8b02112</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Selective Introduction of Acid Sites in Different Confined Positions in ZSM-5 and Its Catalytic Implications

Popis výsledku v původním jazyce

Controlling the location of acid sites in zeolites can have a great effect on catalysis. In this work we face the objective of directing the location of AI into the 10R channels of ZSM-5 by taking advantage of the structural preference of B to occupy certain positions at the channel intersections, as suggested by theoretical calculations. The synthesis of B-Al-ZSM-5 zeolites with variable Si/Al and Si/B ratios, followed by B removal in a postsynthesis treatment, produces ZSM-5 samples enriched in Al occupying positions at 10R channels. The location of the acid sites is determined on the basis of the product distribution of 1-hexene cracking as a test reaction. The higher selectivity to propene and lower C-4(=)/C-3(=) ratio in the samples synthesized with B and subsequently deboronated can be related to a larger concentration of acid sites in 10R channels, where monomolecular cracking occurs. Finally, several ZSM-5 samples have been tested in the methanol to propene reaction, and those synthesized through the Bassisted method show longer catalytic lifetime, higher propene yield, and lower yield of alkanes and aromatics.

Název v anglickém jazyce

Selective Introduction of Acid Sites in Different Confined Positions in ZSM-5 and Its Catalytic Implications

Popis výsledku anglicky

Controlling the location of acid sites in zeolites can have a great effect on catalysis. In this work we face the objective of directing the location of AI into the 10R channels of ZSM-5 by taking advantage of the structural preference of B to occupy certain positions at the channel intersections, as suggested by theoretical calculations. The synthesis of B-Al-ZSM-5 zeolites with variable Si/Al and Si/B ratios, followed by B removal in a postsynthesis treatment, produces ZSM-5 samples enriched in Al occupying positions at 10R channels. The location of the acid sites is determined on the basis of the product distribution of 1-hexene cracking as a test reaction. The higher selectivity to propene and lower C-4(=)/C-3(=) ratio in the samples synthesized with B and subsequently deboronated can be related to a larger concentration of acid sites in 10R channels, where monomolecular cracking occurs. Finally, several ZSM-5 samples have been tested in the methanol to propene reaction, and those synthesized through the Bassisted method show longer catalytic lifetime, higher propene yield, and lower yield of alkanes and aromatics.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

ACS Catalysis

ISSN

2155-5435

e-ISSN

—

Svazek periodika

8

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

7688-7697

Kód UT WoS článku

000441112400091

EID výsledku v databázi Scopus

2-s2.0-85049915298