This article is by Andrew Ross Sorkin, Eric Dash and Rachel L. Swarns.

WASHINGTON  Obama administration officials worked Sunday to persuade reluctant private investors to buy as much as $1 trillion in troubled mortgages and related assets from banks, with government help.

The talks came a day before the Treasury secretary, Timothy F. Geithner, planned to unveil the details of the administration’s long-awaited plan to purchase troubled assets, meant to remove them from the balance sheets of banks and, in turn, spur banks to lend more money to consumers and companies.

The plan relies on private investors to team up with the government to relieve banks of assets tied to loans and mortgage-linked securities of unknown value. There have been virtually no buyers of these assets because of their uncertain risk.

As part of the program, the government plans to offer subsidies, in the form of low-interest loans, to coax private funds to form partnerships with the government to buy troubled assets from banks.