球形氧化铝的制备及其在丙烷脱氢催化剂中的应用

doi:10.11962/1006-4990.2019-0412

Abstract

Abstract:

Alumina precursors synthesized by neutralization method,hydrothermal method,alcoholic aluminium method and aluminium powder-hydrochloric acid reflux method were used as raw materials to prepare spherical alumina carriers which are marked as ZH、SR、ST and SOL respectively.The samples were characterized by strength tester,XRF,BET,SEM and NH₃-TPD,etc.The effect of the alumina support on the performance of Pt-Sn-K/Al₂O₃ catalysts in the dehydrogenation of propane was investigated.The results showed that the alumina precursors synthesized by different methods have been used to prepared spherical alumina supports with high strength.Especially the alumina supports prepared by hydrothermal method and alcoholic aluminium method also had large pore volume and moderate specific surface area.The preparation methods of precursors had greater influence on the acidity of catalysts,while neutralization catalyst was mainly weak-medium-strong acid center and other catalysts were mainly weak acid center,and the order of acidity was ZH-CAT>SOL-CAT>ST-CAT>SR-CAT.The evaluation results showed that the supports prepared by alcoholic aluminium method and hydrothermal method had good performance for propane dehydrogenation catalyst,which was equivalent to or even superior to the industrial catalyst.

Key words: dehydrogenation, propane, alumina, catalyst

CLC Number:

TQ133.1

Yang Wenjian,Meng Guangying,Li Xiaoyun,Sun Yanmin,Cai Qi,Guo Qiushuang. Preparation of spherical alumina and its application in PDH[J]. Inorganic Chemicals Industry, 2020, 52(6): 87-91.

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References 11

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样品	w（Al₂O₃）	w（Na₂O）	w（SiO₂）	w（Fe₂O₃）	w（Cl）
ZH	99.6	0.050	0.062	0.010	—
ST	99.8	0.005	0.010	—	—
SR	99.6	0.041	0.061	0.009	—
SOL	98.5	0.008	0.007	0.013	0.9

样品	孔容/（mL·g^-1）	比表面积/（m²·g^-1）	平均孔径/nm
ZH	0.59	141	16.7
SOL	0.79	81	39.0
ST	0.68	106	25.7
SR	0.66	89	29.7

样品	平均强度/N	表观密度/（g·mL^-1）	强度离散系数
ZH	51.2	0.67	0.17
SOL	34.1	0.58	0.26
ST	42.0	0.64	0.19
SR	38.7	0.64	0.21

样品	酸量/（mmol·g^-1）	样品	酸量/（mmol·g^-1）
ZH-CAT	0.294	SR-CAT	0.187
ST-CAT	0.225	SOL-CAT	0.240

催化剂	平均转化率/%	平均选择性/%	平均收率/%
ZH-CAT	41.8	93.2	39.0
SOL-CAT	42.0	94.5	39.7
ST-CAT	41.9	95.1	39.8
SR-CAT	42.0	95.2	40.0
DH-CAT	41.9	95.2	39.8

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Preparation of spherical alumina and its application in PDH

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