1.-4. (canceled)
5. An exhaust-gas recirculation valve configured for forwarding a gas in a cooled or uncooled state, the exhaust-gas recirculation valve comprising:
a tubular center part having an outer shell;
a gas inlet arranged on the outer shell of the tubular center part;
a gas outlet arranged on the outer shell of the tubular center part adjacent to the gas inlet;
a first branch arranged on the outer shell of the tubular center part opposite the gas outlet;
a second branch arranged on the outer shell of the tubular center part opposite the gas inlet;
a radiator connecting the first branch and the second branch; and
a rotary slide rotatably mounted centrally in the tubular center part such that it sealingly contacts an inner surface of the tubular center part at two points on opposite sides of the longitudinal axis and rotatable about a longitudinal axis of the tubular center part,
wherein the rotary slide is rotatable to create a plurality of operating states comprising:
closing the gas inlet;
passing the exhaust-gas stream in a continuous quantity-regulated manner from the inlet to the outlet; and
passing the exhaust-gas stream in a continuous quantity-regulated manner from the gas inlet to the gas outlet via the first branch, the radiator, and the second branch.
6. The exhaust-gas recirculation valve according to claim 5, wherein
the gas inlet and the gas outlet are arranged perpendicular to each other,
the first branch and the second branch are arranged perpendicular to each other, and respective longitudinal axes of the gas inlet, the gas outlet, the first branch, and the second branch having a common point of intersection.
7. The exhaust-gas recirculation valve according to claim 5 wherein the radiator is a water radiator.
8. The exhaust-gas recirculation valve according to claim 5 wherein the exhaust-gas recirculation valve is configured to recirculate exhaust gas in a motor vehicle.
9. The exhaust-gas recirculation valve according to claim 6, wherein the common point of intersection corresponds to the longitudinal axis of the tubular center part.
10. The exhaust-gas recirculation valve according to claim 6 wherein the radiator is a water radiator.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for preparing zeolite SSZ-52, comprising:
(a) preparing a reaction mixture containing:
(1) at least one source of silicon;
(2) one or more sources of one or more oxides selected from the group consisting of oxides of trivalent elements, pentavalent elements, and mixtures thereof;
(3) at least one source of an element selected from Groups 1 and 2 of the Periodic Table;
(4) at least one organic structure directing agent represented by the following structure:
wherein R1, R2, R3 and R4 are independently selected from the group consisting of alkyl groups having from 1 to 3 carbon atoms and n has a value of 0, 1 or 2;
(5) optionally, an auxiliary structure directing agent comprising an N-cyclohexylmethyl-N-ethylpiperidinium cation;
(6) hydroxide ions; and
(7) water; and
(b) subjecting the reaction mixture to crystallization conditions sufficient to form crystals of the zeolite.
2. The method of claim 1, wherein the organic structure directing agent is selected from the group consisting of an N-ethyl-N-(2,4,4-trimethylcyclopentyl)pyrrolidinium cation, an N-ethyl-N-(3,3,5-trimethylcyclohexyl)pyrrolidinium cation, and mixtures thereof.
3. The method of claim 1, wherein the zeolite is prepared from a reaction mixture comprising, in terms of mole ratios, the following:
SiO2X2Ob
15 to 60
OHSiO2
0.30 to 1.0\u2002
(Q + A)SiO2
0.10 to 0.40
MSiO2
0.10 to 0.50
H2OSiO2
15 to 50
wherein:
(1) X is selected from the group consisting of trivalent and pentavalent elements from Groups 3-13 of the Periodic Table, and mixtures thereof
(2) stoichiometric variable b equals the valence state of compositional variable X;
(3) Q is the at least one organic structure directing agent, and Q>0;
(4) A is an auxiliary structure directing agent comprising an N-cyclohexylmethyl-N-ethylpiperidinium cation, and A\u22670; and
(5) M is selected from the group consisting of elements from Groups 1 and 2 of the Periodic Table.
4. The method of claim 3, wherein Q is selected from the group consisting of an N-ethyl-N-(2,4,4-trimethylcyclopentyl)pyrrolidinium cation, an N-ethyl-N-(3,3,5-trimethylcyclohexyl)pyrrolidinium cation, and mixtures thereof.
5. The method of claim 3, wherein X is selected from the group consisting of B, Al, Ga, In, and mixtures thereof.
6. The method of claim 3, wherein X is Al.
7. A crystalline SSZ-52 zeolite having a composition, as-synthesized and in its anhydrous state, comprising, in terms of mole ratios, the following:
SiO2X2Ob
\u20026 to 50
(Q + A)SiO2
0.02 to 0.08
MSiO2
0.02 to 0.20
wherein:
(1) X is selected from the group consisting of trivalent and pentavalent elements from Groups 3-13 of the Periodic Table, and mixtures thereof;
(2) stoichiometric variable b equals the valence state of compositional variable X;
(3) Q is at least one organic structure directing agent represented by the following structure:
wherein (i) R1, R2, R3 and R4 are independently selected from the group consisting of alkyl groups having from 1 to 3 carbon atoms; (ii) n has a value of 0, 1 or 2; and (iii) Q>0;
(4) A is an auxiliary structure directing agent comprising an N-cyclohexylmethyl-N-ethylpiperidinium cation, and A\u22670; and
(5) M is selected from the group consisting of elements from Groups 1 and 2 of the Periodic Table.
8. The zeolite of claim 7, wherein Q is selected from the group consisting of an N-ethyl-N-(2,4,4-trimethylcyclopentyl)pyrrolidinium cation, an N-ethyl-N-(3,3,5-trimethylcyclohexyl)pyrrolidinium cation, and mixtures thereof.
9. The zeolite of claim 7, wherein X is selected from the group consisting of B, Al, Ga, In, and mixtures thereof.
10. The zeolite of claim 7, wherein X is Al.