Thermal reactions of aromatics with CaO. Technical progress report, September 1, 1982-March 31, 1983. [l-methylnaphthalene]
The effect of calcining temperature and calcining time on the activity of CaO for the cracking of polycyclic aromatic hydrocarbons, as determined by the cracking of l-methylnaphthalene, was examined. In-situ calcination and cracking experiments were performed on fresh Ca(OH)/sub 2/-quartz mixtures for calcining temperatures between 500 and 900/sup 0/C and calcining time between 0 and 8 h. Activity of CaO, which is measured by the extent of cracking of the aromatic, was determined at a reaction temperature of 550/sup 0/C and a contact time of 1 s. Vapor-phase concentration of the aromatic in helium carrier was 2.5 mole percent. Maximum activity of the oxide was obtained at a calcining temperature between 700 and 800/sup 0/C and a calcining time of at least 3 h. Prolonged heating up to 8 h did not change the activity significantly. The cracking of 9-methylanthracene at temperatures between 300 and 700/sup 0/C was studied over both CaO and quartz. Below 600/sup 0/C, this compound did not undergo any noticeable cracking over quartz but yielded a more than 80% conversion over CaO. Although coke, anthracene and CH/sub 4/ were the major products for both cases, the CH/sub 4/ to anthracene ratio revealed that the mechanism for the cracking of this aromatic over CaO was different from that over quartz. In addition, cracking performed at temperatures below 400/sup 0/C suggested that chemisorption probably plays an important role in the cracking chemistry of CaO. This behavior will be further investigated in the next reporting period. 14 references, 9 figures.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA)
- DOE Contract Number:
- FG22-80PC30229
- OSTI ID:
- 6087045
- Report Number(s):
- FE-MIT-30229-5; ON: DE85008530
- Country of Publication:
- United States
- Language:
- English
Similar Records
Thermal reactions of aromatics with CaO. Final report. [1-Methylanthracene, 9-methylanthracene]
Thermal reactions of aromatics with CaO. Technical progress report, September 1, 1980-April 30, 1981. [Compounds tested -1-methylnaphthalene, toulene, benzene, n-heptane]
Related Subjects
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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ALKALINE EARTH METAL COMPOUNDS
ALKANES
ANTHRACENE
AROMATICS
CALCINATION
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CALCIUM OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COKE
COMPARATIVE EVALUATIONS
CONDENSED AROMATICS
CRACKING
DATA
DECOMPOSITION
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
METHANE
MINERALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POLYCYCLIC AROMATIC HYDROCARBONS
PYROLYSIS
QUARTZ
SILICON COMPOUNDS
SILICON OXIDES
TEMPERATURE EFFECTS
THERMOCHEMICAL PROCESSES
YIELDS