add_action( 'woocommerce_after_shop_loop_item', 'remove_add_to_cart_buttons', 1 );
function remove_add_to_cart_buttons() {
if( is_product_category() || is_shop()) {
remove_action( 'woocommerce_after_shop_loop_item', 'woocommerce_template_loop_add_to_cart' );
}
}