Synthesis of framework modified ZSM-48 crystals
AssigneeExxonMobil Research and Engineering Company
InventorsWenyih Frank Lai, Lei Zhang
Life of this patent
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Abstract
Methods are provided for synthesis ZSM-48 crystals (or other MRE framework crystals) having heteroatoms different from silicon and aluminum incorporated into the framework structure, and use of such crystals for applications such as catalytic processing of hydrocarbonaceous feeds. Examples of heteroatoms can include titanium, zirconium, and zinc.
Claims13
A method of dewaxing a hydrocarbonaceous feedstock, comprising:
- exposing a feedstock under effective dewaxing conditions to a catalyst comprising ZSM-48 crystals containing at least one of titania, zirconia, or zinc oxide as a framework metal oxide in a ZSM-48 structural framework, a molar ratio of SiO2 to the framework metal oxide in the ZSM-48 structural framework being 70 to 200, a molar ratio of SiO2 to Al7O3 in the ZSM-48 structural framework of 120 to 225.
A method of synthesizing ZSM-48 crystals containing at least one of titania, zirconia, or zinc oxide as a framework metal oxide in a zeolite structural framework, the method comprising crystallizing a reaction mixture comprising a source of water, a source of SiO2, a source of the framework metal oxide, a source of an alkali metal M, and a source of a structure directing agent in the form of an organic cation, Q,
- the reaction mixture having a molar ratio of structure directing agent cation, Q, to SiO2 in said reaction mixture of 0.01 to 0.2;
- a molar ratio of SiO2 to framework metal oxide in said reaction mixture of 50 to 225;
- a molar ratio of water to SiO2 in said reaction mixture of 1 to 500;
- a molar ratio of hydroxyl group concentration to SiO2 in said reaction mixture of from 0.1 to 0.5;
- a molar ratio of alkali metal, M, to SiO2 in said reaction mixture of from 0.05 to 0.5;
- and a molar ratio of SiO2 to Al2O3 in said reaction mixture of 120 to 225.
Dependencies are inferred from the claim text.