不同MoO_(3)含量Raney Ni-Al_(2)O_(3)吸附剂的表征及其脱硫性能研究  

Characterization and desulfurization performance of Raney Ni-Al_(2)O_(3) adsorbents with different MoO_(3) contents

作　　者：瞿颖男 曹永正 徐新 罗国华[1] QU Ying-nan;CAO Yong-zheng;XU Xin;LUO Guo-hua(Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology,College of New Materials and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)

机构地区：[1]北京石油化工学院新材料与化工学院,燃料清洁化及高效催化减排技术北京市重点实验室,北京102617

出　　处：《现代化工》2023年第3期192-195,202,共5页Modern Chemical Industry

摘　　要：采用混捏法制备了添加不同质量分数氧化钼的Raney Ni-Al_(2)O_(3)吸附剂,并利用XRD、BET、SEM、XPS等手段对吸附剂进行表征,采用连续固定床反应装置评价吸附剂的脱硫性能。结果表明,当氧化钼负载量为1%时,Raney Ni-Al_(2)O_(3)吸附剂吸附活性最强,比表面积和孔径均达到最大,分别为68.45 m^(2)/g、15.24 nm。此时Raney Ni-Al_(2)O_(3)吸附剂在固定床反应器中对苯中噻吩的脱硫性能最高,饱和硫容达到最大,为35.17 mg/g。MoO_(3)添加量过高时会使吸附剂中的镍产生NiMoO_(4)晶相,堵塞吸附剂表面孔道,骨架镍海绵状结构特征不再明显,吸附活性大大降低。与未改性的Raney Ni-Al_(2)O_(3)吸附剂相比,添加1%MoO_(3)后的吸附剂表面分布更多的金属镍和氧化镍。Raney Ni-Al_(2)O_(3)adsorbents with different molybdenum oxide contents are prepared via the kneading method, and characterized by XRD,BET,SEM,XPS,H2-TPR and other means.Using benzene containing 100 mg·kg^(-1)thiophene as the target, the desulfurization performances of the adsorbents are evaluated in WFD-3030 fixed bed reactor.The result shows that the adsorption activity of Raney Ni-Al_(2)O_(3)adsorbent is the strongest and its specific surface area and pore size reach the largest, which are 68.45 m^(2)·g^(-1)and 15.24 nm, respectively when the loading of MoO_(3)is 1%.Such an adsorbent has the best adsorption activity for thiophene in benzene in the fixed bed reactor, with the saturated sulfur capacity reaching the maximum, 35.17 mg·g^(-1).XRD and SEM results show that too high amount of MoO_(3)can cause NiMoO_(4)crystal phase to form in nickel in the adsorbent, which will block the pores on the surface of the adsorbent.The sponge-like structure of the framework nickel will no longer be obvious, resulting in a decrease in adsorption activity.XPS characterization results also show that compared with the unmodified Raney Ni-Al_(2)O_(3),the 1% MoO_(3)/Raney Ni-Al_(2)O_(3)adsorbent has more metallic nickel and nickel oxide distributed on its surface.

关 键 词：吸附剂 制备 氧化钼 苯 噻吩 脱硫 

分 类 号：TQ028.6[化学工程] TQ027.8