Method for forming light olefins from methanol
AssigneeKing Fahd University of Petroleum and Minerals
InventorsMohammad Ashraf Ali, Shakeel Ahmed
Life of this patent
Estimating the term…
Abstract
A catalyst system and a process for methanol to light olefin conversion with enhanced selectivity towards propylene. The catalyst system comprises a honeycomb monolith catalyst support coated with aluminosilicate nanozeolite catalysts on the edges and inside the channels of the support structure. The aluminosilicate nanozeolite catalysts have not been pre-modified with a promoter metal. The catalyst system gives higher hydrothermal stability to the catalyst compared to randomly packed pellet catalysts and allows methanol to be converted to predominantly propylene at a low temperature, with decreased selectivity towards C2, higher olefins and paraffinic hydrocarbons.
Claims7
A method for forming light olefins from methanol, comprising:
- contacting gaseous methanol with a catalyst system for a time and at a temperature effective for converting the methanol to propylene and for forming a light olefin mixture,
- wherein the contacting is carried out with a selectivity towards converting methanol to propylene of at least 40% relative to a total mass of the light olefin mixture and a selectivity towards forming propylene is greater than a selectivity towards forming ethylene relative to a total mass of the light olefin mixture and that is greater than a selectivity towards forming butylene relative to a total mass of the light olefin mixture,
- wherein the catalyst system comprises:
- 7-12 wt % of the zeolite nanoparticles relative to the total weight of the catalyst system of zeolite nanoparticles having a silica to alumina molar ratio of 260-5000 in the form of crystals having an average particle diameter of 10-50 nm;
- and
- a honeycomb monolith support with 500-1200 cells per square inch coated with the zeolite nanoparticles on the edges and inside the channels of the honeycomb monolith support,
- wherein the honeycomb monolith support has an average cross-sectional dimension of 0.9-1.2 inches by 0.9-1.2 inches;
- wherein the zeolite nanoparticles are not modified with a promoter metal.
Dependencies are inferred from the claim text.