重芳烃轻质化催化剂n（Ni）/n（Ni+Mo）的优化与分析

doi:10.19964/j.issn.1006-4990.2021-0137

摘要/Abstract

摘要：

以β分子筛为载体,在保持金属总负载量不变的情况下,采用等体积浸渍法制备了4种不同n（Ni）/n（Ni+Mo）的催化剂。分别采用X射线衍射（XRD）、比表面积测试（BET）、氨程序升温脱附（NH₃-TPD）、氢程序升温还原（H₂-TPR）、氢程序升温脱附（H₂-TPD）和热重-差热分析（TG-DTG）等方法对催化剂进行了表征。结果表明,4种催化剂的酸量和酸强度相近,在n（Ni）/n（Ni+Mo）等于基准+0.2时,Mo与载体之间的相互作用最弱,其氢气吸附量最多且积炭量最少;采用某炼厂重整C₁₀⁺ 重芳烃对4种催化剂进行评价,结果表明n（Ni）/n（Ni+Mo）等于基准+0.2催化剂具有最优的催化活性和稳定性。上述结果表明,影响重芳烃轻质化催化剂活性和稳定性的关键因素是催化剂氢气吸附量的多少,氢气吸附量越多金属表面的溢流氢效应越明显,积炭前驱体被溢流氢及时消除,从而保护了催化剂的加氢活性中心不被积炭覆盖,有助于催化剂在较高活性下保持稳定。

关键词: 重芳烃轻质化, 催化剂, 加氢, n（Ni）/n（Ni+Mo）

Abstract:

In order to further improve the activity and stability of heavy aromatic light catalyst,four catalysts with different n（Ni）/n（Ni+Mo） atomic ratios were prepared by incipient-wetness impregnation method with zeolite β as support.The total mass of the metal was same.The catalysts were characterized by XRD,NH₃-TPD,H₂-TPR,H₂-TPD and TG-DTG.The results showed that the acid content and acid strength of the four catalysts were similar,and when the n（Ni）/n（Ni+Mo） atomic ratio was of standard+0.2,the interaction between Mo and the support was the weakest,with the maximum adsorption capacity of H₂ and the minimum carbon deposition.Four catalysts were evaluated by using reforming C₁₀⁺ heavy aromatics.The results showed that the catalyst with the n（Ni）/n（Ni+Mo） atomic ratio of standard+0.2 had the optimal catalytic activity and stabi-lity.The above results showed that the key factor affecting the activity and stability of catalyst was the amount of H₂ adsorption,the more H₂ was adsorbed,the more obvious the hydrogen overflow effect was on metal surface.The precursor of carbon deposition was eliminated in time by overflow hydrogen,thus,the hydrogenation active center of the catalyst was protected from carbon deposition,it was helpful to keep the catalyst stable at high activity.

Key words: heavy aromatics to light aromatics, catalyst, hydrogenation, n（Ni）/n（Ni+Mo） atomic ratios

中图分类号:

TQ138.13

刘航,臧甲忠,范景新,郭春垒,靳凤英,赵训志. 重芳烃轻质化催化剂n（Ni）/n（Ni+Mo）的优化与分析[J]. 无机盐工业, 2021, 53(12): 140-145.

LIU Hang,ZANG Jiazhong,FAN Jingxin,GUO Chunlei,JIN Fengying,ZHAO Xunzhi. Optimization and analysis of n（Ni）/n（Ni+Mo） of heavy aromatics to light aromatics catalyst[J]. Inorganic Chemicals Industry, 2021, 53(12): 140-145.

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碳数	w （环烷烃）	w （芳烃）	w （总和）
9	0	1.04	1.04
10	0.09	38.60	38.69
11	0	6.81	6.81
12	0	2.29	2.29
12⁺	0	51.20	51.20

项目	比表面积/（m²·g^-1）	孔容/（cm³·g^-1）
β载体	408	0.400
n（Ni）/n（Ni+Mo）=基准	376	0.358
n（Ni）/n（Ni+Mo）=基准+0.2	361	0.344
n（Ni）/n（Ni+Mo）=基准+0.3	359	0.342
n（Ni）/n（Ni+Mo）=基准+0.4	350	0.340

催化剂	酸强度/℃	酸量/（mmol·g^-1）
n（Ni）/n（Ni+Mo）=基准	311	0.358
n（Ni）/n（Ni+Mo）=基准+0.2	302	0.364
n（Ni）/n（Ni+Mo）=基准+0.3	308	0.368
n（Ni）/n（Ni+Mo）=基准+0.4	309	0.363

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