Was the Haitian earthquake the 2nd highest ever on the Richter scale?

No. The second highest earthquake magnitude (depending on the source of the information) was either the Boxing Day 2004 Indian Ocean earthquake (magnitude 9.1 - 9.3) or the 1964 Alaskan earthquake (magnitude 9.2).

The Haitian Earthquake in January 2010 had a Richter magnitude of 7.2.