Disclosed is a process for the conversion of acyclic C.sub.5 feedstock to a product comprising cyclic C.sub.5 compounds, such as for example, cyclopentadiene, and catalyst compositions for use in such process. The process comprising the steps of contacting said feedstock and, optionally, hydrogen under acyclic C.sub.5 conversion conditions in the presence of a catalyst composition to form said product. The catalyst composition comprising a crystalline aluminosilicate having a constraint index of less than or equal to 5, and a Group 10 metal, and, optionally, a Group 11 metal, in combination with a Group 1 alkali metal and/or a Group 2 alkaline earth metal.

Disclosed is a process for the conversion of acyclic C.sub.5 feedstock to a product comprising cyclic C.sub.5 compounds, such as for example, cyclopentadiene, and catalyst compositions for use in such process. The process comprising the steps of contacting said feedstock and, optionally, hydrogen under acyclic C.sub.5 conversion conditions in the presence of a catalyst composition to form said product. The catalyst composition comprising a crystalline aluminosilicate having a constraint index of less than or equal to 5, and a Group 10 metal, and, optionally, a Group 11 metal, in combination with a Group 1 alkali metal and/or a Group 2 alkaline earth metal.

Disclosed is a process for the conversion of acyclic C.sub.5 feedstock to a product comprising cyclic C.sub.5 compounds, including cyclopentadiene, and catalyst compositions for use in such process. The process comprises contacting the feedstock and, optionally, hydrogen under acyclic C.sub.5 conversion conditions in the presence of a catalyst composition to form said product. The catalyst composition comprises a microporous crystalline metallosilicate, a Group 10 metal or compound thereof, and a Group 11 metal or compound thereof.

Disclosed is a process for the conversion of acyclic C.sub.5 feedstock to a product comprising cyclic C.sub.5 compounds, including cyclopentadiene, and catalyst compositions for use in such process. The process comprises contacting the feedstock and, optionally, hydrogen under acyclic C.sub.5 conversion conditions in the presence of a catalyst composition to form said product. The catalyst composition comprises a microporous crystalline metallosilicate, a Group 10 metal or compound thereof, and a Group 11 metal or compound thereof.

Disclosed is a process for the conversion of acyclic C.sub.5 feedstock to a product comprising cyclic C.sub.5 compounds, such as, for example, cyclopentadiene, and catalyst compositions for use in such process. The process comprises the steps of contacting said feedstock and, optionally, hydrogen under acyclic C.sub.5 conversion conditions in the presence of a catalyst composition to form said product. The catalyst composition comprising a microporous crystalline aluminosilicate having a constraint index in the range of 3 to 12, a Group 10 metal, and, optionally, a Group 11 metal, in combination with a Group 1 alkali metal and/or a Group 2 alkaline earth metal.

Disclosed is a process for the conversion of acyclic C.sub.5 feedstock to a product comprising cyclic C.sub.5 compounds, such as, for example, cyclopentadiene, and catalyst compositions for use in such process. The process comprises the steps of contacting said feedstock and, optionally, hydrogen under acyclic C.sub.5 conversion conditions in the presence of a catalyst composition to form said product. The catalyst composition comprising a microporous crystalline aluminosilicate having a constraint index in the range of 3 to 12, a Group 10 metal, and, optionally, a Group 11 metal, in combination with a Group 1 alkali metal and/or a Group 2 alkaline earth metal.

Disclosed is a process for the conversion of acyclic C.sub.5 feedstock to a product comprising cyclic C.sub.5 compounds, such as for example, cyclopentadiene, and catalyst compositions for use in such process. The process comprising the steps of contacting said feedstock and, optionally, hydrogen under acyclic C.sub.5 conversion conditions in the presence of a catalyst composition to form said product. The catalyst composition comprising a microporous crystalline ferrosilicate, a Group 10 metal, and, optionally, a Group 11 metal, in combination with an optional Group 1 alkali metal and/or an optional Group 2 alkaline earth metal.

Disclosed is a process for the conversion of acyclic C.sub.5 feedstock to a product comprising cyclic C.sub.5 compounds, such as for example, cyclopentadiene, and catalyst compositions for use in such process. The process comprising the steps of contacting said feedstock and, optionally, hydrogen under acyclic C.sub.5 conversion conditions in the presence of a catalyst composition to form said product. The catalyst composition comprising a microporous crystalline ferrosilicate, a Group 10 metal, and, optionally, a Group 11 metal, in combination with an optional Group 1 alkali metal and/or an optional Group 2 alkaline earth metal.

A method for recovering cyclopentene, includes allowing a metathesis catalyst to act on a ring-opened polymer having a structural unit derived from cyclopentene to recover cyclopentene.

A method for recovering cyclopentene, includes allowing a metathesis catalyst to act on a ring-opened polymer having a structural unit derived from cyclopentene to recover cyclopentene.