Synergy Effect of High K-Low Ca-High Si Biomass Ash Model System on Syngas Production and Reactivity Characteristics during Petroleum Coke Steam Gasification oleh Juntao Wei, Lina Tian, Jiawei Sun, Kuan Ding, Bin Li, Yonghui Bai, Lipeeka Rout, Xia Liu, Guangyu Xu, Guangsuo Yu