DeIuliis will replace J Brett Harvey, who will take on the position of executive chairman.
“Nick is well-prepared to lead Consol Energy into a very exciting chapter in our 150-year history, having already served as a critical member of the management team that skilfully steered the company through a transformative and important period of time," Harvey said.
DeIuliis has served as president of Consol since February 2011.
He has spent more than 23 years with the company, at both the coal and exploration and production divisions of the business.
In that time he has held positions of chief operating officer and senior vice president of strategic planning.
He was also president and CEO of CNX Gas Corporation from its creation in 2005, to 2009.
