The paper chiefly compares the catalytic activity and stability of nano-sized nickel and Raney nickel in the catalytic hydrogenation of p-nitrophenol.The experimental results show that the catalytic activity and stabi...The paper chiefly compares the catalytic activity and stability of nano-sized nickel and Raney nickel in the catalytic hydrogenation of p-nitrophenol.The experimental results show that the catalytic activity and stability of nano-sized nickel are superior to those of Raney nickel under the same reaction conditions. The fresh and used nickel samples are characterized by nitrogen sorption and particle analyzer. The results suggest that particle size,surface structure,etc. may play a key role in determining the catalytic activity of nickel samples.The aggregation of nano-particles would lead to the deactivation of nano-sized nickel,while the jamming of pores would be one of the reasons for the deactivation of Raney nickel.展开更多
用微型催化反应装置结合X射线衍射(XRD)、H2化学吸附、NH3吸附-程序升温脱附(NH3-TPD)和H2-程序升温还原等多种物理化学手段研究了丙烷脱氢负载型Pt Sn Na/SUZ-4催化剂中Na+助剂组分的作用。结果表明,Na+组分可中和SUZ-4载体表面的强酸...用微型催化反应装置结合X射线衍射(XRD)、H2化学吸附、NH3吸附-程序升温脱附(NH3-TPD)和H2-程序升温还原等多种物理化学手段研究了丙烷脱氢负载型Pt Sn Na/SUZ-4催化剂中Na+助剂组分的作用。结果表明,Na+组分可中和SUZ-4载体表面的强酸中心、提高催化剂的Pt金属分散度、抑制脱氢产物的裂解和积炭的生成,从而提高催化剂的丙烷脱氢选择性和反应稳定性。但是过量Na+组分的存在会削弱Sn物种与载体之间的相互作用,使其易被还原,导致催化剂丙烷脱氢活性显著下降。展开更多
文摘The paper chiefly compares the catalytic activity and stability of nano-sized nickel and Raney nickel in the catalytic hydrogenation of p-nitrophenol.The experimental results show that the catalytic activity and stability of nano-sized nickel are superior to those of Raney nickel under the same reaction conditions. The fresh and used nickel samples are characterized by nitrogen sorption and particle analyzer. The results suggest that particle size,surface structure,etc. may play a key role in determining the catalytic activity of nickel samples.The aggregation of nano-particles would lead to the deactivation of nano-sized nickel,while the jamming of pores would be one of the reasons for the deactivation of Raney nickel.
文摘用微型催化反应装置结合X射线衍射(XRD)、H2化学吸附、NH3吸附-程序升温脱附(NH3-TPD)和H2-程序升温还原等多种物理化学手段研究了丙烷脱氢负载型Pt Sn Na/SUZ-4催化剂中Na+助剂组分的作用。结果表明,Na+组分可中和SUZ-4载体表面的强酸中心、提高催化剂的Pt金属分散度、抑制脱氢产物的裂解和积炭的生成,从而提高催化剂的丙烷脱氢选择性和反应稳定性。但是过量Na+组分的存在会削弱Sn物种与载体之间的相互作用,使其易被还原,导致催化剂丙烷脱氢活性显著下降。
