Patent ID: 8557219

Claim:
A method of making a crystalline molecular sieve composition having a pore size in the range of from about 2 to about 19 Å, said method comprising the steps of: (a) providing a mixture comprising at least one source of ions of tetravalent element (Y), at least one hydroxide source (OH − ), at least one structure—directing agent (template), and water, said mixture having a solid-content in the range of from about 15% to about 50%, wherein said solid-content is measured as the weight of said tetravalent element and said weight of said trivalent element express in terms of their oxides divided by the weight of said water in said mixture as a percentage as follows: solid-content = said weight of said oxides in said mixture × 100 ⁢ % said weight of said in said mixture ; and (b) treating said mixture with stirring at crystallization conditions sufficient to obtain a weight hourly throughput from about 0.005 to about 1 hr −1 , and a weight hourly template efficiency of at least about 0.05 hr −1 to form said crystalline molecular sieve, wherein said crystallization conditions comprise a temperature in the range of from about 200° C. to about 500° C. and a crystallization time less than 100 hr, wherein said crystalline molecular sieve has a zeolite framework type comprising at least one of ABW, AEI, AEL, AET, AFI, AFO, CHA, EMT, FAU, FER, LEV, LTA, LTL, MAZ, MEL, MTT, NES, OFF, TON, VFI, MWW, MTW, MOR, EUO, *BEA, and MFS, wherein said weight hourly template efficiency is calculated by dividing the weight of the molecular sieve produced in the dried cake with the weight of the directing agent used in the synthesis mixture and the total time required for the crystallization as follows: weight hourly template efficiency = weight of the oxide of tetravalent element ( ⁢ YO 2 ) × tetravalent element oxide utilization (weight of the directing agent) × (crystallization time) , and said tetravalent element oxide utilization is 0.85.