Molecular sieve SSZ-123, its synthesis and use

A method of synthesizing a molecular sieve of MFS framework type, the method comprising:

• (1) preparing a reaction mixture comprising:
• (a) a source of silicon, wherein the source of silicon is selected from colloidal silica, precipitated silica, fumed silica, alkali metal silicates, tetraalkyl orthosilicates, and any combination thereof;
• (b) a source of aluminum, wherein the source of aluminum is selected from hydrated alumina, aluminum hydroxide, alkali metal aluminates, aluminum alkoxides, water-soluble aluminum salts, and any combination thereof;
• (c) a source of an alkali or alkaline earth metal (M), wherein the alkali or alkaline earth metal comprises potassium;
• (d) a structure directing agent comprising 1-ethyl-1-[5-(triethylammonio)pentyl]piperidinium cations (Q);
• (e) a source of hydroxide ions;
• and
• (f) water;
• and
• (2) subjecting the reaction mixture to crystallization conditions to form crystals of the molecular sieve, wherein the crystallization conditions comprise heating the reaction mixture under autogenous pressure at a temperature of from 120° C. to 200° C. for a time of from 1 day to 21 days;
• wherein the reaction mixture has a composition, in terms of molar ratios, as follows:
• SiO2/Al2O3
• 10 to 35
• M/SiO2
• 0.05 to 0.50
• Q/SiO2
• 0.01 to 0.30
• OH/SiO2
• 0.10 to 0.70
• H2O/SiO2
• 15 to 60.