Posts per page does not work

<section <?php post_class('noticias'); ?>>
	<div class="container">
		<?php if(term_description($term_id, $taxonomy)): ?>
			<div class="descricao">
				<?php echo term_description($term_id, $taxonomy); ?>			
			</div>
		<?php endif; ?>
		
		<div class="row">
			
		
			
			<div class="col-md-9 ">

			<?php query_posts('posts_per_page=>12'); ?>
			<?php if (is_category()): ?>
				
				<?php if(have_posts()): ?>
					<?php include dirname(__FILE__) . '../../molecules/category.php'; ?>
				<?php else : ?>
					<?php
	if ( function_exists('yoast_breadcrumb') ) {
	yoast_breadcrumb('
	<p id="breadcrumbs">','</p>
	');
	}
	?>
	<br>
					<p><i class="fa fa-info-circle"></i> Nenhum post encontrado nesta categoria.</p>
				<?php endif; ?>

			<?php else: ?>
<?php query_posts('posts_per_page=>12'); ?>
				<?php if(have_posts()): while(have_posts()): the_post(); ?>
					<?php include dirname(__FILE__) . '../../molecules/post.php'; ?>
				<?php endwhile; else : ?>
				<?php
					if ( function_exists('yoast_breadcrumb') ) {
						yoast_breadcrumb('
							<p id="breadcrumbs">','</p>
						');
					}
				?>
	<br>

					<p><i class="fa fa-info-circle"></i> Nenhum post encontrado nesta categoria.</p>
				<?php endif; ?>
				
			<?php endif ?>

				<?php wp_pagenavi(); ?>

			</div>

			<div class="col-md-3">
				
				

				<?php get_sidebar(); ?>
			</div>

		</div><!-- /.row final linha -->
	</div>
</section>