Selective reforming process for the production of aromatics
First Claim
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1. A process for the reforming of a hydrocarbon feedstock comprising contacting the feedstock with a reforming catalyst at reforming conditions to obtain an aromatics-rich effluent stream, the catalyst comprising:
- (a) a nonacidic large-pore molecular sieve having a unit empirical formula on an anhydrous basis of mA;
(SnwAlxSiy)O2;
where A is at least one exchangeable cation selected from the group consisting of alkali and alkaline earth metals, “
m”
is the mole fraction of A and varies from about 0.01 to about 0.49, “
w”
is the mole fraction of tin and varies from about 0.01 to about 0.49, “
x”
is the mole fraction of aluminum and varies from about 0.01 to about 0.49, and “
y”
is the mole fraction of silicon and varies from about 0.50 to about 0.98;
(b) a platinum-group metal component; and
, (c) an non-acid inorganic-oxide binder.
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Abstract
A reforming process, selective for the dehydrocyclization of paraffins to aromatics, is effected using a large-pore molecular-sieve catalyst containing a uniformly distributed platinum-group metal component, and a tin component incorporated into the large-pore molecular sieve by secondary synthesis. The use of this catalyst results in greater selectivity of conversion of paraffins to aromatics and in improved catalyst stability.
36 Citations
20 Claims
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1. A process for the reforming of a hydrocarbon feedstock comprising contacting the feedstock with a reforming catalyst at reforming conditions to obtain an aromatics-rich effluent stream, the catalyst comprising:
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(a) a nonacidic large-pore molecular sieve having a unit empirical formula on an anhydrous basis of mA;
(SnwAlxSiy)O2;
where A is at least one exchangeable cation selected from the group consisting of alkali and alkaline earth metals, “
m”
is the mole fraction of A and varies from about 0.01 to about 0.49, “
w”
is the mole fraction of tin and varies from about 0.01 to about 0.49, “
x”
is the mole fraction of aluminum and varies from about 0.01 to about 0.49, and “
y”
is the mole fraction of silicon and varies from about 0.50 to about 0.98;
(b) a platinum-group metal component; and
,(c) an non-acid inorganic-oxide binder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A process for the reforming of a hydrocarbon feedstock comprising contacting the feedstock with a reforming catalyst at reforming conditions comprising an operating pressure of from about 100 kPa to about 1.0 MPa, a liquid hourly space velocity of from about 0.5 to 40 hr−
- 1 and a temperature of from about 260°
to 600°
C. to convert at least about 50 mass-% of paraffinic and olefinic hydrocarbons in the feedstock with a yield of no more than about 0.5 mass-% methane relative to the hydrocarbon feedstock and obtain an aromatics-rich effluent stream, the catalyst comprising;(a) a nonacidic L-zeolite having a unit empirical formula on an anhydrous basis of mA;
(SnwAlxSiy)O2;
where A is at least one exchangeable cation selected from the group consisting of alkali and alkaline earth metals, “
m”
is the mole fraction of A and varies from about 0.01 to about 0.49, “
w”
is the mole fraction of tin and varies from about 0.01 to about 0.49, “
x”
is the mole fraction of aluminum and varies from about 0.01 to about 0.49, and “
y”
is the mole fraction of silicon and varies from about 0.50 to about 0.98;
(b) a platinum-group metal component; and
,(c) an non-acidic silica inorganic-oxide binder. - View Dependent Claims (18, 19)
- 1 and a temperature of from about 260°
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20. A process for the reforming of a hydrocarbon feedstock comprising contacting the feedstock with a reforming catalyst at reforming conditions to obtain an aromatics-rich effluent stream, the catalyst being characterized by a method of preparation comprising:
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(a) contacting a microporous crystalline material with a fluoro salt of tin, said fluoro salt being in the form of an aqueous solution or slurry at a pH of about 3 to about 7 to provide a molecular sieve having a unit empirical formula on an anhydrous basis of mA;
(SnwAlxSiy)O2;
where A is at least one exchangeable cation selected from the group consisting of alkali and alkaline earth metals, “
m”
is the mole fraction of A and varies from about 0.01 to about 0.49, “
w”
is the mole fraction of tin and varies from about 0.01 to about 0.49, “
x”
is the mole fraction of aluminum and varies from about 0.01 to about 0.49, and “
y”
is the mole fraction of silicon and varies from about 0.50 to about 0.98;
(b) treating the microporous crystalline material to render it nonacidic (c) compositing the molecular sieve with an inorganic non-acidic silica binder to form a bound catalyst; and
,(d) incorporating a platinum-group metal component and finishing the composite to form a catalyst by one or both of calcination and reduction.
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Specification