Так вот если, условно, нужно разместить текст на /catalog/ - то размещайте в /catalog/index.php сразу под подключением компонента каталога.
Options -Indexes
ErrorDocument 404 /404.php
<IfModule mod_php5.c>
php_flag session.use_trans_sid off
php_value display_errors 1
#php_value mbstring.internal_encoding UTF-8
</IfModule>
<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-l
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !/bitrix/urlrewrite.php$
RewriteRule ^(.*)$ /bitrix/urlrewrite.php [L]
RewriteRule .* - [E=REMOTE_USER:%{HTTP:Authorization}]
</IfModule>
<IfModule mod_dir.c>
DirectoryIndex index.php index.html
</IfModule>
<IfModule mod_expires.c>
ExpiresActive on
ExpiresByType image/jpeg "access plus 3 day"
ExpiresByType image/gif "access plus 3 day"
ExpiresByType image/png "access plus 3 day"
ExpiresByType text/css "access plus 3 day"
ExpiresByType application/javascript "access plus 3 day"
</IfModule>
AddDefaultCharset utf-8
AddType 'text/html; charset=utf-8' .html .htm .shtml