Herein, for the first time, we report a solvent-free synthesis of aluminosilicate SSZ-39 zeolite without addition of water in the presence of N,N-dimethyl-3,5-dimethylpiperidine (DMDMP) cation as an organic structure-directing agent. Various characterizations, including powder X-ray diffraction ...
The unsolved challenges related to zeolite SSZ-39 are outlined and the corresponding areas for future exploration in the synthesis and applications of zeolite SSZ-39 are discussed.Keywords SSZ-39, Small-pore zeolite, Synthesis, Methanol to olefins, Selective catalytic reduction 分子筛材料以其独特的...
Rare-earth Yttrium Exchanged Cu-SSZ-39 Zeolite with Superior Hydrothermal Stability and SO2-Tolerance in NH3-SCR of NOx Rui Yu,Haiyu Kong, Dr. Zhenchao Zhao, Prof. Chuan Shi, Prof. Xiangju Meng, Prof. Feng-Shou Xiao, Dr. Trees De Baerdemaeker, Dr. Andrei-Nicolae Parvulescu, Dr. Ulric...
Co-SSZ-39 zeoliteCH4Hydrothermal stabilityCO and SO2 toleranceSelective catalytic reduction (SCR) of nitrogen oxides (NOx ) with methane has been considered as an efficient technology for simultaneous removal of emitted NOx and unburned CH4 in both transport (heavy-duty vehicles and ships) and ...
The present invention relates to new crystalline zeolite SSZ- 39 prepared using a cyclic or polycyclic quaternary ammonium cation templating agent.doi:US5958370 AStacey I. ZonesYumi NakagawaSusan T. EvansGregory S. LeeUSUS5958370 * Dec 11, 1997 Sep 28, 1999 Chevron U.S.A. Inc. Zeolite SSZ...
The present disclosure is directed to producing zeolite structures, especially Zeolite SSZ-39, using organic structure directing agents (OSDAs). In particular, the OSDAs comprise isomeric mixtures of N,N-dialkyl piperidinium cations.MICHIEL J. DUSSELIER...
The addition of CTAB changed the morphology of SSZ-39 zeolite. Compared to conventional SSZ-39 without CTAB addition, the nanosheet SSZ-39 had a higher SiO2/Al2O3 ratio (18.5 vs 16.7), a larger specific surface area (482 m2 g1 vs 433 m2 g1) and a higher strong acid density of (...
The present disclosure is directed to producing zeolite structures, especially Zeolite SSZ-39, using organic structure directing agents (OSDAs). In particular, the OSDAs comprise isomeric mixtures of Ν,Ν-dialkyl piperidinium cations.DUSSELIER, Michiel, J....
Previous studies have demonstrated that zeolite support with twelve-membered ring (12-MR) and five-membered ring (5-MR) structures are susceptible to framework collapse in the presence of H2O, leading to catalyst deactivation. Consequently, there is a necessity to explore novel z...
A process for making SSZ-39 zeolite employing at least one organic structure-directing agent (OSDA), in which a substantial quantity of the at least one OSDA, which otherwise would be required to form a zeolite such as SSZ-39, is replaced by at least one quaternary ammonium or phosphonium ...