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Treatment of diatomaceous earth to obtain its catalyst support

Mahani, H ; Sharif University of Technology | 2003

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  1. Type of Document: Article
  2. Publisher: Sharif University of Technology , 2003
  3. Abstract:
  4. Treatment of diatomaceous earth with sulfuric acid reduces mineral and organic impurities, such as Fe2O3, Al2O3 and alkali metal oxides (CaO, MgO and Na2O). In addition, wettability and porosity of the acid-treated diatomite are greatly enhanced. Acid-treated diatomite is suitable to be used as a siliceous support for catalysts, due to high silica content (> 90%), amorphous structure with low cristobalite and quartz phases, appropriate Brunauer-Emmett-Teller surface area, high absorptive capacity, good mechanical strength after calcinations and low cost of production. In the first part of this study, the influence of temperature, sulfuric acid concentration, acid-diatomite mass ratio and time of acid treating was investigated on one sample of diatomite obtained from one of the Khorassan Province mines (sample A). Then, the determined optimum ranges of the aforementioned parameters were tested on other samples of diatomite obtained from Tabriz and Khorassan mines (sample B) and the Persian Gulf seashore. Results confirmed the determined optimum conditions for acid treatment of diatomite
  5. Keywords:
  6. Catalyst ; Silicate
  7. Source: Scientia Iranica ; Volume 10, Issue 3 , 2003 , Pages 350-356 ; 10263098 (ISSN)
  8. URL: http://scientiairanica.sharif.edu/article_2644.html