Disaply products from category

If you’re actually using categories (and not a custom taxonomy) then your category-name needs to be the slug, not the actual name.

If, however, you are using a custom taxononomy (and you’ll know if you are) then you should use

 'name-of-your-custom-tax' => 'slug'     

You can also see the below links for details.
http://codex.wordpress.org/Class_Reference/WP_Query#Category_Parameters http://codex.wordpress.org/Class_Reference/WP_Query#Taxonomy_Parameters