pg_dump: No matching schemas were found
Fixed this by changing the quotes from "schema_name" to '"schema_name"'

See: pg_dump doesn't dump datascheme with uppercase letters in

...where Tom Lane replied:


  The problem is that there are two levels of quoting needed: one for the shell and one for SQL.  As you wrote it, the double quotes are stripped off by the shell and so pg_dump gets Schema, which is case-folded per normal SQL rules.  So you need to write:

pg_dump -n '"Schema"' -U postgres database

  
  Now, the shell eats the single quotes and passes "Schema" to pg_dump.