摘要:
A process for preparing a ZSM-4 type crystalline zeolite material wherein 1,4-diazobicyclo (2.2.2) octane (DABCO), triethylenediamine (TED) is used as the source of an organic cation.
摘要:
As synthesized by previous methods, ZSM-4 zeolites are crystallized in the presence of substantial amounts of a tetramethylammonium hydroxide or halide. When synthesized in this way, they contain the tetramethylammonium cation as well as a metal cation such as sodium. To obtain a more catalytically active form, the sodium ion must be exchanged to very low levels. Catalysts prepared in this manner have been found to be quite low in stability. By synthesizing these zeolites in the presence of pyrrolidine or choline salts, ZSM-4 having a different organic nitrogen containing cation but the same crystal structure as previously prepared ZSM-4 is obtained. Catalysts made therefrom are, surprisingly, much more stable than those prepared from ZSM-4 made by previous methods.
摘要:
A new crystalline zeolite, designated ZSM-35, a method of making same and the use thereof in catalytic conversion of hydrocarbons is the subject of this application. The new zeolite has a composition, in the anhydrous state, expressed in terms of mole ratios of oxides as follows:(0.3-2.5)R.sub.2 O:(0-0.8)M.sub.2 O:Al.sub.2 O.sub.3 :>8 SiO.sub.2wherein R is an organic nitrogen-containing cation and M is an alkali metal cation, and is characterized by a specified X-ray powder diffraction pattern.
摘要:
A method of producing zeolites particularly ZSM-5 and ZSM-11 by strictly controlling the composition of the forming bath such that no organic is required. In a preferred embodiment the forming bath can contain seeds, lower aliphatic alcohols and/or ammonium hydroxide. The as-crystallized product has no organic in its pore structures and has a relatively low silica to alumina ratio.
摘要:
As synthesized by previous methods, ZSM-5 or ZSM-11 zeolites are crystallized in the presence of substantial amounts of a nitrogen-containing compound. When synthesized in this way, they contain an organic ammonium cation as well as a metal cation such as sodium. To obtain a more active form, the sodium ion must be exchanged out. Such exchange, especially with ZSM-5 and ZSM-11, is difficult unless there is calcination of the zeolite to remove the obstructing organo compounds. By making these zeolites in the presence of (1) seeds of the desired zeolite, (2) mixtures of them with ammonium hydroxide and/or alcohol, (3) the alcohol per se or (4) mixtures of the alcohol with ammonium hydroxide, a product substantially deficient in organic ammonium cation is obtained. These products can be exchanged directly without any calcination.
摘要:
Catalytic conversion of organic compounds in the presence of crystalline zeolite ZSM-23, or a thermal decomposition product thereof, is provided. Zeolite ZSM-23 has a composition, in the anhydrous state, expressed in terms of mole ratios ofoxides, as follows:(0.58 to 3.4)M.sub.2/n O : Al.sub.2 O.sub.3 : (40 to 25)SiO.sub.2wherein M is at least one cation having a valence n, and is characterized by a specified X-ray powder diffraction pattern.
摘要:
A new crystalline zeolite, designated ZSM-43, a method of making same and the use thereof in catalytic conversion of organic compounds is the subject of this application. The new zeolite has a composition, in the anhydrous state, expressed in terms of mole ratios of oxides, as follows:(0.6 to 2.1)M.sub.2/n O : Al.sub.2 O.sub.3 : xSiO.sub.2wherein M is at least one cation having a valence n and x is at least 5, and is characterized by a specified X-ray powder diffraction pattern.
摘要:
As synthesized by previous methods, ZSM-5 or ZSM-11 zeolites are crystallized in the presence of substantial amounts of a nitrogen-containing compound. When synthesized in this way, they contain an organic ammonium cation as well as a metal cation such as sodium. To obtain a more active form, the sodium ion must be exchanged out. Such exchange, especially with ZSM-5 and ZSM-11, is difficult unless there is calcination of the zeolite to remove the obstructing organo compounds. By making these zeolites in the presence of (1) seeds of the desired zeolite, (2) mixtures of them with ammonium hydroxide and/or alcohol, (3) the alcohol per se or (4) mixtures of the alcohol with ammonium hydroxide, a product substantially deficient in organic ammonium cation is obtained. These products can be exchanged directly without any calcination.
摘要:
Catalytic conversion of hydrocarbon compounds in the presence of crystalline zeolite ZSM-35, or a thermal decomposition product thereof, is provided. Zeolite ZSM-35 has a composition, in the anhydrous state, expressed in terms of mole ratios of oxides as follows:(0.3-2.5)R.sub.2 O:(0-0.8)M.sub.2 O : Al.sub.2 O.sub.3 : (x) SiO.sub.2wherein R is an organic nitrogen-containing cation derived from ethylenediamine or pyrrolidine, M is an alkali metal cation and x is greater than 8, and is characterized by a specified X-ray powder diffraction pattern.
摘要:
A new crystalline zeolite, designated ZSM-23, a method of making same and the use thereof in catalytic conversion of organic compounds is the subject of this application. The new zeolite has a composition, in the anhydrous state, expressed in terms of mole ratios of oxides, as follows;(0.58-3.4)M.sub.2/n O : Al.sub.2 O.sub.3 : (40-250)SiO.sub.2wherein M is at least one cation having a valence n, and is characterized by a specified X-ray powder diffraction pattern.