Study of Phosphorus-modified Aluminum Pillared Montmorillonite .1. Effect of the Nature of Phosphorus-compounds
(1990) Applied Catalysis A: General — Vol. 67, n° 1, p. 93-106 (1990)
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- Abstract
- Phosphorus and phosphoric acids induce effects on the physiochemical and catalytic properties of Al-pillared montmorillonite. H3PO3 results in a slight increase in the thermal stability and a significant enhancement of total acidity defined as an improvement of Br-theta-nsted acidity and a loss of Lewis acidity. H3PO4 causes a strong reduction in the thermal stability, BET area and both Lewis and Br-theta-nsted acid sites. This substantial difference is attributed to different pH and different ease of AlPO4 formation: low pH and AlPO4 formation produce deleterious effects. Two different structural models and new acid site formation are proposed. Conversion in the 1 butanol reaction shows that the conversion is correlated with Lewis acidity. The medium and strong acid sites created explain the ratios of 1-butene (1B) to dibutyl ether (DBE) and of 2-butenes to (1B + DBE).
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Shen, YF., Ko, AN., & Grange, P. (1990). Study of Phosphorus-modified Aluminum Pillared Montmorillonite .1. Effect of the Nature of Phosphorus-compounds. Applied Catalysis A: General, 67(1), 93-106. https://doi.org/10.1016/S0166-9834(00)84434-6 (Original work published 1990)