Sn和Zn对重芳烃轻质化NiMo/β催化剂性能的影响

doi:10.16085/j.issn.1000-6613.2020-1707

摘要/Abstract

摘要：

以β分子筛为载体，采用等体积浸渍法制备了三种催化剂NiMo/β、SnNiMo/β和ZnNiMo/β，采用XRD、NH₃-TPD、H₂-TPR、H₂-TPD和TG-DTG对催化剂进行表征。结果表明，第三金属Sn和Zn的加入减弱了催化剂的酸性质，促进了Mo与载体之间的相互作用，提高了催化剂吸附H₂的能力，降低了反应过程的积炭量。采用某炼厂重整C₁₀₊重芳烃对三种催化剂进行评价，结果表明第三金属Sn和Zn的加入均显著提高了催化剂的稳定性和液收，且含Zn的催化剂具有最优的轻质化性能。

关键词: 重芳烃, 轻质化, 催化剂, 分子筛, 加氢, 锡, 锌

Abstract:

Three catalysts, NiMo/β, SnNiMo/β and ZnNiMo/β were prepared by incipient-wetness impregnation method with β zeolite as the support. The catalysts were characterized by XRD, NH₃-TPD, H₂-TPR, H₂-TPD and TG-DTG. The results show that the addition of Sn and Zn weaken the acid properties of the catalyst, promoted the interaction between Mo and the support, improved the H₂ adsorption capacity of the catalyst, and reduced the amount of carbon deposition in the reaction process. The three catalysts were evaluated by using reforming C₁₀₊ heavy aromatics. The results show that the addition of Sn and Zn significantly improved the stability and liquid yield, and the catalyst containing Zn had the best heavy aromatics to light aromatics properties.

Key words: heavy aromatics to light aromatics, catalyst, zeolite, hydrogenation, stannum(Sn), zinc(Zn)

中图分类号:

TQ032

刘航, 臧甲忠, 范景新, 郭春垒, 靳凤英, 赵训志, 马明超. Sn和Zn对重芳烃轻质化NiMo/β催化剂性能的影响[J]. 化工进展, 2021, 40(7): 3909-3914.

LIU Hang, ZANG Jiazhong, FAN Jingxin, GUO Chunlei, JIN Fengying, ZHAO Xunzhi, MA Mingchao. Effects of Sn and Zn on the properties of heavy aromatic to light aromatic NiMo/β catalyst[J]. Chemical Industry and Engineering Progress, 2021, 40(7): 3909-3914.

图/表 9

表1 某炼厂C10+重芳烃性质

项目	值
密度（20℃）/g·cm^-3	0.959
初馏点/℃	162
终馏点/℃	368.6

图1 载体及催化剂XRD谱图（RC为相对结晶度）

表2 三种催化剂的物性数据

催化剂	脱附温度/℃	酸量/mmol·g^-1	积炭量/%
NiMo/β	314	0.358	22.9
SnNiMo/β	304	0.314	20.6
ZnNiMo/β	302	0.322	18.3

图2 三种催化剂的NH3-TPD曲线图

表3 载体及三种催化剂的BET数据

项目	比表面积/m²·g^-1	孔容/cm³·g^-1
β载体	408	0.40
NiMo/β	376	0.358
SnNiMo/β	361	0.344
ZnNiMo/β	359	0.342

图3 三种催化剂的H2-TPR曲线图

图4 三种催化剂的H2-TPD曲线图

图5 三种评价后的催化剂TG-DTG曲线图

图6 三种催化剂C10+重芳烃转化率及液收对比

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