We present an embedding scheme to introduce local corrections at post Hartree-Fock level to density functional theory (DFT) calculations. As a first application we study proton jump reactions in the zeolite HSSZ-13 and show that energy barriers and rate constants are significantly changed by second-order Moller-Plesset perturbation theory (MP2) corrections to plane wave based DFT calculations. Electronic energy barriers increase from 68 to 81 kJ/mol (dry zeolite), and from 22 to 30 kJ/mol (hydrated zeolite). The predicted heats of adsorption of one water molecule onto the Bronsted acidic sites O-1 and O-2 are 73 and 69 kJ/mol, respectively. (C) 2004 Elsevier B.V. All rights reserved.