At this point, the psychological issues behind denialism are much more interesting than any more repetitions of mindless denier conspiracy theories. That is, what causes a normal human to devolve into a denier?
This recent study shows how, compared to regular people, deniers stick to their own echo chamber. They won't speak to anyone except other deniers, so they have little idea of what the real world is like.
Climate Change Debate Fueled by Echo Chambers New Study Finds SESYNC
We also have Lewandowsky's work on it. His first paper showed how conspiracy theorists tend to fall for a wide range of conspiracy theories. That's why most deniers will also tell you how the ozone hole never existed, and that DDT is harmless.
NASA Faked the Moon Landing Therefore Climate Science Is a Hoax
That paper prompted a torrent of conspiracy theories from deniers, thus proving the paper's point, and prompting the Recursive Fury paper.
http://scienceblogs.com/pharyngula/files/2014/03/fpsyg-04-00073.pdf
And that prompted the deniers to go on a cult jihad against the publisher. The authoritarian mindset in general, which deniers usually possess, is described here.
http://members.shaw.ca/jeanaltemeyer/drbob/TheAuthoritarians.pdf
Deniers don't show a common personality disorder, but we can often diagnose obvious personality disorders in individual deniers. Some common personality disorders you'll see displayed here are:
1. Histrionic (PAY ATTENTION TO ME!)
2. Narcissistic (Obviously, I, a mere layman, know better than all the scientists of the world, because of this blog I saw.)
3. Paranoid (IT'S ALL A HOAX!)
4. Shizotypal (cuckoo, cuckoo, ...)
5. Anti-social (I HATE YOU &#^#%^ DIRTY WARMERS)