If you want to remove the “Add to Cart” buttons from the catalog pages, this is how you do it:
All you have to do is find the right file to edit, then you just need to delete some code in that file.
The file you need to edit is list.phtml
You can find it by going to: app > design > frontend > default > default > template > catalog > product > list.phtml
Because the catalog pages can by viewed in either grid mode or list mode, there are two references to the “Add to Cart” button in the code within the list.phtml file. Make sure you delete the code in both sections. If you read the code, you will see where it says list mode and grid mode.
Look for this code, then delete it:
<?if($_product->isSaleable()):?><button class="form-button" onclick="setLocation('<?=$this->getAddToCartUrl($_product)?>')"><span><?=__('Add to Cart')?></span></button><?endif;?>
Once you’ve done that, you shouldn’t see the “Add to Cart” buttons on the catalog pages anymore.