Catalytic hydrogenolysis of a polymer
AssigneeNorthwestern University
InventorsTobin Jay Marks, Yosi Kratish, Alexander Heath Mason
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Abstract
Provided is a process for hydrogenolysis of a polymer that includes providing in a reactor the polymer, hydrogen gas and a supported organometallic catalyst. The supported organometallic catalyst formed from an organometallic complex precatalyst and an acidic metal oxide support. The polymer is reacted with the supported organometallic catalyst in the presence of the hydrogen gas at a predetermined temperature in the reactor to produce a reduced polymer product having a weight average molecular weight less than the polymer.
Claims19
A process for hydrogenolysis of a polymer, comprising:
- providing in a reactor the polymer, hydrogen gas and a supported organometallic catalyst, the supported organometallic catalyst formed from an organometallic complex precatalyst of Formula I:
- MRmLx, Formula I
- wherein m is 0 to 6;
- x is 0 to 6;
- M is a transition metal selected from the group consisting of transition metal groups 3 through 8;
- R is independently selected from the group consisting of H, a C1 to C8 hydrocarbyl, and a halogen;
- and each L is independently selected from the group consisting of a C1 to C12 substituted or unsubstituted hydrocarbyl, wherein the value of m and x depends upon the oxidation state of M;
- and
- an acidic metal oxide support;
- and
- reacting the polymer with the supported organometallic catalyst in the presence of the hydrogen gas at a predetermined temperature in the reactor to produce a reduced polymer product having a weight average molecular weight less than the polymer, wherein the supported organometallic catalyst is represented by Formula II:
- Ly-xRx-zMn+ . . . O− (acidic metal oxide support) Formula II
- wherein M is selected from the group consisting of Zr, Hf, Ti, Nb, V, Cr, Mo, W. Ta, Co, and Ni;
- R is independently selected from hydrogen, a halogen, and L;
- each L is independently selected from a C1 to C12 saturated or unsaturated hydrocarbyl, and a C1 to C12 silyl hydrocarbyl;
- n is 1, 2, or 3;
- y is 3;
- x is 2 or 1;
- and z is 1 or 0.
A process for hydrogenolysis of a polymer, comprising:
- providing in a reactor the polymer, hydrogen gas and a supported organometallic catalyst, the supported organometallic catalyst formed from an organometallic complex precatalyst of Formula I:
- MRmLx, Formula I
- wherein m is 0 to 6;
- x is 0 to 6;
- M is a transition metal selected from the group consisting of transition metal groups 3 through 8;
- R is independently selected from the group consisting of H, a C1 to C8 hydrocarbyl, and a halogen;
- and each L is independently selected from the group consisting of a C1 to C12 substituted or unsubstituted hydrocarbyl, wherein the value of m and x depends upon the oxidation state of M;
- and
- an acidic metal oxide support;
- and
- reacting the polymer with the supported organometallic catalyst in the presence of the hydrogen gas at a predetermined temperature in the reactor to produce a reduced polymer product having a weight average molecular weight less than the polymer, wherein the supported organometallic catalyst is represented by Formula II:
- Ly-xRx-zMn+ . . . O− (acidic metal oxide support) Formula II
- wherein M is selected from the group consisting of Zr, Hf, Ti, Nb, V, Cr, Mo, W, Ta, Co, and Ni;
- R is independently selected from hydrogen, a halogen, and L;
- each L is independently selected from a C1 to C12 saturated or unsaturated hydrocarbyl, and a C1 to C12 silyl hydrocarbyl;
- n is 1;
- y is 3;
- x is 2 or 1;
- and z is 1 or 0.
Dependencies are inferred from the claim text.