Matches in SemOpenAlex for { <https://semopenalex.org/work/W1991983263> ?p ?o ?g. }
Showing items 1 to 71 of
71
with 100 items per page.
- W1991983263 endingPage "10" @default.
- W1991983263 startingPage "1" @default.
- W1991983263 abstract "Crystalline microporous SAPO-5 molecular sieves with different silicon content, acid-treated SAPO-5 and Na-exchanged SAPO-5 were investigated far their thermal stability, and acidic and catalytic properties. SAPO-5 materials with increasing Si framework content exhibited lower thermal stability. The effects of the thermal treatment and Na exchange on the N2-sorption capacity (at 78 K) of these materials were studied. In situ IR spectroscopic investigations of pyridine chemisorbed on the aluminophosphate catalysts revealed that the concentration of Bronsted and Lewis acid sites are strongly affected by the Si content in the AlPO4 framework, acid treatment, and Na exchange. The results of temperature programmed desorption (TPD) and stepwise thermal desorption of pyridine suggest that there exists a broad site energy distribution over the aluminophosphate catalysts. The number of strong acid sites on the aluminophosphate catalysts increases with the increasing Si content in the AlPO4 framework. The acid treatment and Na exchange showed a decrease in the number of strong acid sites on SAPO-5. The TPD of pyridine over SAPO-5, acid-treated SAPO-5, and Na-exchanged SAPO-5 indicated the presence of two types of acid sites. Correlation between the number of strong acid sites (measured in terms of the chemisorption of pyridine at 673 K) and framework charge on the aluminophosphate catalysts has also been obtained. The catalytic activities of SAPO-5 catalysts in the ethanol, n-hexane, isooctane, toluene, and o-xylene conversion reactions were studied. The catalytic activity of the aluminophosphate increases with the Si content in the AlPO4 framework. The dependence of cumene cracking activity of the aluminophosphate on time-on-stream show that the deactivation of SAPO-5 with higher Si content is faster. A sharp increase in the deactivation rate of SAPO-5 was observed after the Na exchange." @default.
- W1991983263 created "2016-06-24" @default.
- W1991983263 creator A5054379823 @default.
- W1991983263 date "1994-09-01" @default.
- W1991983263 modified "2023-09-23" @default.
- W1991983263 title "Thermal Stability, Acidity, Catalytic Properties, and Deactivation Behavior of SAPO-5 Catalysts: Effect of Silicon Content, Acid Treatment, and Na Exchange" @default.
- W1991983263 doi "https://doi.org/10.1006/jcat.1994.1267" @default.
- W1991983263 hasPublicationYear "1994" @default.
- W1991983263 type Work @default.
- W1991983263 sameAs 1991983263 @default.
- W1991983263 citedByCount "14" @default.
- W1991983263 countsByYear W19919832632014 @default.
- W1991983263 countsByYear W19919832632015 @default.
- W1991983263 countsByYear W19919832632021 @default.
- W1991983263 crossrefType "journal-article" @default.
- W1991983263 hasAuthorship W1991983263A5054379823 @default.
- W1991983263 hasConcept C105281773 @default.
- W1991983263 hasConcept C150394285 @default.
- W1991983263 hasConcept C155916967 @default.
- W1991983263 hasConcept C161790260 @default.
- W1991983263 hasConcept C162711632 @default.
- W1991983263 hasConcept C163638829 @default.
- W1991983263 hasConcept C178790620 @default.
- W1991983263 hasConcept C179104552 @default.
- W1991983263 hasConcept C185592680 @default.
- W1991983263 hasConcept C2777352791 @default.
- W1991983263 hasConcept C2778077586 @default.
- W1991983263 hasConcept C2779485729 @default.
- W1991983263 hasConcept C2781047139 @default.
- W1991983263 hasConcept C33790079 @default.
- W1991983263 hasConcept C59061564 @default.
- W1991983263 hasConcept C79878483 @default.
- W1991983263 hasConcept C86381522 @default.
- W1991983263 hasConceptScore W1991983263C105281773 @default.
- W1991983263 hasConceptScore W1991983263C150394285 @default.
- W1991983263 hasConceptScore W1991983263C155916967 @default.
- W1991983263 hasConceptScore W1991983263C161790260 @default.
- W1991983263 hasConceptScore W1991983263C162711632 @default.
- W1991983263 hasConceptScore W1991983263C163638829 @default.
- W1991983263 hasConceptScore W1991983263C178790620 @default.
- W1991983263 hasConceptScore W1991983263C179104552 @default.
- W1991983263 hasConceptScore W1991983263C185592680 @default.
- W1991983263 hasConceptScore W1991983263C2777352791 @default.
- W1991983263 hasConceptScore W1991983263C2778077586 @default.
- W1991983263 hasConceptScore W1991983263C2779485729 @default.
- W1991983263 hasConceptScore W1991983263C2781047139 @default.
- W1991983263 hasConceptScore W1991983263C33790079 @default.
- W1991983263 hasConceptScore W1991983263C59061564 @default.
- W1991983263 hasConceptScore W1991983263C79878483 @default.
- W1991983263 hasConceptScore W1991983263C86381522 @default.
- W1991983263 hasIssue "1" @default.
- W1991983263 hasLocation W19919832631 @default.
- W1991983263 hasOpenAccess W1991983263 @default.
- W1991983263 hasPrimaryLocation W19919832631 @default.
- W1991983263 hasRelatedWork W1576300119 @default.
- W1991983263 hasRelatedWork W1995609448 @default.
- W1991983263 hasRelatedWork W2004291541 @default.
- W1991983263 hasRelatedWork W2033987418 @default.
- W1991983263 hasRelatedWork W2072574582 @default.
- W1991983263 hasRelatedWork W2072633711 @default.
- W1991983263 hasRelatedWork W2077962522 @default.
- W1991983263 hasRelatedWork W2117869826 @default.
- W1991983263 hasRelatedWork W2521378802 @default.
- W1991983263 hasRelatedWork W2950319402 @default.
- W1991983263 hasVolume "149" @default.
- W1991983263 isParatext "false" @default.
- W1991983263 isRetracted "false" @default.
- W1991983263 magId "1991983263" @default.
- W1991983263 workType "article" @default.