I would like your contribution to find the best thermally stable MOF until reported. If you or your colleague published a new MOF with high thermal stability please also add to the answer.
UiO-66 decomposes at around 540 degrees Celcius in air, various ZIFs have similarly high thermal decomposition points. Your best bet is a search through SciFinder for MOFs or ZIFs with high thermal stability.
Synopsis A lithium based three-dimensional metal−organic framework is prepared using a solvothermal technique. The framework consists of a two-dimensional LiO antifluorite layer connected by organic linkers. It shows unprecedented thermal stability and is stable up to 610 °C. http://pubs.acs.org/doi/abs/10.1021/cg8014157
Synopsis A lithium based three-dimensional metal−organic framework is prepared using a solvothermal technique. The framework consists of a two-dimensional LiO antifluorite layer connected by organic linkers. It shows unprecedented thermal stability and is stable up to 610 °C. http://pubs.acs.org/doi/abs/10.1021/cg8014157
Maya Mary Kurian Only between 400-610 degree Celsius, and I think it's highly challenging to achieve a temperature of 1000 because of labile coordination bond in the MOF system. Besides, covalent organic framework that based on organics cannot reach 1000 degree Celsius . ONLY inorganic materials hold high withstanding temperature.
A high thermally stable novel binuclear Co-based MOF: The Lower Symmetric Cluster Meets the Lower Symmetric Ligand to Sharply Boost MOFs’ Thermal Stability DOI:10.1039/D0CC04543H
Your best shot will be using some transition metal-oxides or zeolites in that temperature range. Even mesoporous silica loses its porosity above 600 *C.