Synthesis of high silica zeolites using a combination of pyrrolidine and tetramethylammonium as template

Unary Adsorption Equilibria of Hydrogen, Nitrogen, and Carbon Dioxide on Y-Type Zeolites at Temperatures from 298 to 393 K and at Pressures up to 3 MPa

“…When compared to the ionic radii of Na + and TMA + (Table ), it can be inferred that the kinetics of ion exchange between Na + within the β-cages and TMA + in solution may be sterically hindered. Similar conclusions were drawn for TMA + exchange in a ZSM-5 framework by heating in air . Most notably, as indicated by the TG curves for Zeolite NaTMA–Y, the TMA + content of our sample after activation at 623 K under vacuum for 16 h substantially decreased, yielding 0.2 mol kg –1 of TMA + (Table ).…”

“…Similar conclusions were drawn for TMA + exchange in a ZSM-5 framework by heating in air. 48 Most notably, as indicated by the TG curves for Zeolite NaTMA−Y, the TMA + content of our sample after activation at 623 K under vacuum for 16 h substantially decreased, yielding 0.2 mol kg −1 of TMA + (Table 2). At these conditions, TMA + may already undergo partial decomposition to C−H and N−H compounds, leaving H + within the cages to balance the charge.…”

Synthesis and catalytic application of nanorod-like FER-type zeolites

“…The former signal is assigned to the methylene (C 1 ) groups existed in pyrrolidine ring, while the latter is attributed to the methylene groups linked to the nitrogen atom in pyrrolidine ring. 36 These results confirm that the pyrrolidine molecule is well preserved within the zeolite pores. The TGA patterns of the samples are shown in Fig.…”

Advances in the Synthesis of Ferrierite Zeolite

“…Recently, Rima et al studied the synthesis of FER zeolites through the combined use of TMA and THP as co-SDAs. The result showed that THP plays an important role in the initial nucleation while TMA + provided both space-filling and basicity capacities in the synthesis of aluminosilicate FER zeolite [71].…”

“…In general, it is well-known that the use of different organic templates would affect the properties of the obtained zeolites including Al distribution, acidic strength, morphology and so on, and thus further influence its catalytic performance. In this case, the use of cooperative structure-directing agents (co-SDAs) would attract much attention because the different combinations of the organic templates used in the synthesis could influence the zeolite properties [22,66,[70][71][72][73][74]. For example, Perez-Pariente et al designed a novel synthesis strategy in fluoride medium based on the combination of the small molecules (TMA) with the bulkier molecules (benzylmethylpyrrolidinium, BMP) as the organic templates.…”