Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High resolution electron microscopy for heterogeneous catalysis research   Heterogeneous catalysts are the most important catalysts in industrial
reactions. Nanocatalysts, with size ranging from hundreds of nanometers to the
atomic scale, possess activities that are closely connected to their structural
characteristics such as particle size, surface morphology, and
three-dimensional topography. Recently, the development of advanced analytical
transmission electron microscopy (TEM) techniques, especially quantitative
high-angle annular dark-field (HAADF) imaging and high-energy resolution
spectroscopy analysis in scanning transmission electron microscopy (STEM) at
the atomic scale, strengthens the power of (S)TEM in analyzing the
structural/chemical information of heterogeneous catalysts. Three-dimensional
reconstruction from two-dimensional projected images and the real-time
recording of structural evolution during catalytic reactions using in-situ
(S)TEM methods further broaden the scope of (S)TEM observation. The
atomic-scale structural information obtained from high resolution (S)TEM has
proven to be of significance for better understanding and designing of new
catalysts with enhanced performance.

21
The categories of this paper are: adap-org
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin