Use of Borosilicate Seeds to Synthesize Aluminosilicate SSZ-82, a Zeolite Containing Intersecting 12-and 10-Membered Ring Channels

SSZ-82 (SEW) is a 12 x 10 membered ring zeolite that offers intriguing catalytic possibilities due to the intersection of pore channels of differing dimensions. Previously, SSZ-82 was a zeolite that could only be directly made as a borosilicate. Here, we show that the borosilicate material can be used as seeds to synthesize an aluminosilicate product. Aluminum-containing SSZ-82 (Al-SSZ-82) was directly synthesized using an interzeolite conversion method: FAU zeolite was the parent zeolite, and boron-containing SSZ-82 (B-SSZ-82) was used as seeds. The conversion of FAU to Al-SSZ-82 was monitored with time, and the use of SSZ-82 seeds, organic structure-directing agent, Na+, and total OH- were all shown to be important for successful conversion to SSZ-82. In addition, the surface area and heteroatom of the SSZ-82 seeds played important roles in the conversion rate: calcining the seeds, grinding the seeds down to smaller particles, and using heteroatoms that are less stable all increased the kinetics of the conversion.

Automated summary

SSZ-82 (SEW) is a zeolite with a 12 x 10 membered ring structure and intersecting pore channels of different dimensions, offering intriguing catalytic possibilities. Previously, SSZ-82 could only be directly synthesized as a borosilicate. However, this study demonstrates that the borosilicate material can be used as seeds to synthesize an aluminosilicate product, Al-SSZ-82, through interzeolite conversion using FAU zeolite as the parent zeolite and B-SSZ-82 as seeds. The use of SSZ-82 seeds, organic structure-directing agent, Na+, and total OH- were all found to be important for the successful conversion to SSZ-82, and the conversion rate was influenced by the surface area and heteroatom of the SSZ-82 seeds.