wordpress categories by name loop

<?php
		$args = array( 'post_type' => 'post',
		//'category_name' => array('Ins', 'Pub'),
		//'cat' => '7,10',
		 'orderby' => 'date', 'order' => 'DESC',
		 'posts_per_page' => 17 );
$loop = new WP_Query( $args );
		// The beginning of the loop looks like this:
while ( $loop->have_posts() ) : $loop->the_post();
$post_id = get_the_ID();
 ?>