Abstract
Thermochemical stability of pure-silica MCM-41 molecular sieves(pore size 2.5-5 nm) was studied by high temperature solution and transposed temperature drop calorimetry at 977 K. Though the pore size varies by approximately 2 nm(almost a factor of 2), there are minimal differences in enthaply among these structures both at 977 and 298 K. At 298 K they are destabilized by less than 15 kJ/mol relative to quartz, which implies an energy only about 1 kJ/mol higher than siliceous zeolite Y, whose pore size is 0.74 nm. Results are compared with those for other microporous silicas and implications for structure/stability relations are discussed.
Original language | English (US) |
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Pages (from-to) | 677-684 |
Number of pages | 8 |
Journal | Studies in Surface Science and Catalysis |
Volume | 84 |
Issue number | C |
DOIs | |
State | Published - Jan 1 1994 |
Externally published | Yes |
ASJC Scopus subject areas
- Catalysis
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry