1. College of Chemistry and Chemical Engineering, Collaborat Innovat Center of Coal Work Safety, Henan Polytechnic University, Jiaozuo, People’s Republic of China
2. China National Accreditation Service for Conformity Assessment, Beijing, People’s Republic of China
3. Institute of Resources & Environment, Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Henan Polytechnic University, Jiaozuo, People’s Republic of China