We consider intertwining relations of the augmented q-Onsager algebra
introduced by Ito and Terwilliger, and obtain generic (diagonal) boundary
K-operators in terms of the Cartan element of U_q(sl_2). These
K-operators solve reflection equations. Taking appropriate limits of these
K-operators in Verma modules, we derive K-operators for Baxter Q-operators
and corresponding reflection equations.
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