Molecular sieve CIT-16P, its synthesis, transformation and use
AssigneeCalifornia Institute of Technology
InventorsJong Hun Kang, Faisal H Alshafei, Mark E Davis
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Abstract
The disclosure provides a novel silicoaluminophosphate molecular sieve, referred to as CIT-16P, that comprises a silicoaluminophosphate framework with an occluded OSDA that is DiQ-C4 or DiQ-C3. The synthesis of CIT-16P, its conversion to SAPO-17, and the use of the so-derived SAPO-17 in the MTO reaction are also disclosed.
Claims20
A silicoaluminophosphate molecular sieve (referred to as CIT-16P), comprising a silicoaluminophosphate framework with an occluded OSDA that is DiQ-C4 or DiQ-C3, wherein the CIT-16P is characterized by one or more of the following:
- a. a PXRD pattern substantially as shown in FIG. 3 entries S7, S8, or S9;
- b. a PXRD pattern substantially as shown in FIG. 4 entries S15, S16, S17, S18, S21, S24, S25, or S37;
- c. a PXRD pattern substantially as shown in FIG. 5(a);
- d. PXRD peaks at five or more of:
- 8.5±0.2, 10.1±0.2, 10.6±0.2, 13.5±0.2, 15.5±0.2, 16.9±0.2, 17.7±0.2, 18.0±0.2, 18.1±0.2, 19.9±0.2, 22.3±0.2, 22.9±0.2, 24.7±0.2, 25.3±0.2, 27.4±0.2, 29.5±0.2, 29.8±0.2, 30.6±0.2, 30.8±0.2, 32.3±0.2, or 34.8±0.2 degrees 2-θ;
- e. A thermogravimetric profile substantially as shown in FIG. 5(d);
- f. a 8 k MAS solid-state 13C NMR spectrum substantially as shown in FIG. 6;
- g. a 27Al MAS spectrum substantially as shown in FIG. 8(a);
- h. a 27Al MAS spectrum having peaks at about 41.5 ppm and about 7.3 ppm;
- i. a 31P MAS spectrum substantially as shown in FIG. 8(b);
- j. a 31P MAS spectrum having peaks at about −9.8, −13.7, −21.4, −23.7, and −28.1 ppm;
- k. a 1H-29Si CPMAS spectrum substantially as shown in FIG. 8(c);
- l. A 1H-29Si CPMAS spectrum having peaks at −91.1 ppm;
- m. a crystal structure having the lattice parameters shown in Table S4;
- n. a crystal structure having the atomic positions and anisotropic tensors of atoms substantially as shown in Table S5;
- o. a crystal structure having the topological analysis shown in Table S7;
- or
- p. a crystal structure having the bond valences and bond distances substantially as shown in Table S6.
A SAPO-17 molecular sieve having a Si/T-atom ratio that is less than 0.034 as determined by EDS elemental analysis, wherein T=Si+Al+P.
Dependencies are inferred from the claim text.