Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theoretical models for NO decomposition in Cu-exchanged zeolites   A unified description of the catalytic effect of Cu-exchanged zeolites is
proposed for the decomposition of NO. A general expression for the rate
constant of NO decomposition is obtained by assuming that the rate-determining
step consists of the transferring of a single atom associated with breaking of
the N-O bond. The analysis is performed on the base of the generalized Langevin
equation and takes into account both the potential interactions in the system
and the memory effects due to the zeolite vibrations. Two different mechanisms
corresponding to monomolecular and bimolecular NO decomposition are discussed.
The catalytic effect in the monomolecular mechanism is related to both the Cu+
ions and zeolite O-vacancies, while in the case of the bimolecular mechanism
the zeolite contributes through dissipation only. The comparison of the
theoretically calculated rate constants with experimental results reveals
additional information about the geometric and energetic characteristics of the
active centers and confirms the logic of the proposed models.

6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom