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| 1 | Deactivation mechanism of beta-zeolite catalyst for synthesis of cumene by benzene alkylation with isopropanol显示文摘The alkylation of benzene with isopropanol over beta-zeolite is a more cost-effective solution to cumene production. During the benzene alkylation cycles, the cumene selectivity slowly increased, while the benzene conversion presented the sharp decrease due to catalyst deactivation. The deactivation mechanism of betazeolite catalyst was investigated by characterizing the fresh and used catalysts. The XRD, SEM and TEM results show that the crystalline and particle size of the beta-zeolite catalyst almost remained stable during the alkylation cycles. The drop in catalytic activity and benzene conversion could be explained by the TG, BET,NH_3-TPD and GC–MS results. The organic matters mainly consisted of ethylbenzene, p-xylene and 1-ethyl-3-(1-methyl) benzene produced in the benzene alkylation deposited in the catalyst, which strongly reduced the specific surface area of beta-zeolite catalyst. Moreover, during the reaction cycles, the amount of acidity also significantly decreased. As a result, the catalyst deactivation occurred. To maintain the catalytic performance,the catalyst regeneration was carried out by using ethanol rinse and calcination. The deactivated catalyst could be effectively regenerated by the calcination method and the good catalytic performance was obtained. | Yefei Liu Yang Zou Hong Jiang Huanxin Gao Rizhi Chen | 2017 | Chinese Journal of Chemical Engineering2017，25，9： | 4 |
| 2 | Phenol hydrogenation to cyclohexanone over palladium nanoparticles loaded on charming activated carbon adjusted by facile heat treatment显示文摘Selective phenol hydrogenation is a green approach to produce cyclohexanone.It still remains a big challenge to prepare efficient supports of the catalysts for the phenol hydrogenation via a simple and cost-effective approach.Herein,a facile approach was developed,i.e.,direct calcination of activated carbon(AC)under argon at high temperature,to improve its structure and surface properties.The modified AC materials were supported with Pd nanoparticles(NPs)to fabricate the Pd/C catalysts.The as-prepared Pd/C600 catalyst exhibits superior catalytic performance in the phenol hydrogenation,and its turnover frequency(TOF)value is 199.2 h^-1,1.31 times to that of Pd/C-raw.The Pd/C600 catalyst presents both better hydrophobicity and more structural defects,contributing to the improved dispersibility in the reaction solution(phenol-cyclohexane),the better Pd dispersion and the smaller Pd size,which result in the enhancement of the catalytic performance.Furthermore,the as-prepared Pd/C600 catalyst shows a good recyclability. | Chunhua Zhang Guangxin Yang Hong Jiang Yefei Liu Rizhi Chen Weihong Xing | 2020 | Chinese Journal of Chemical Engineering2020，28，10： | 2 |
| 3 | ANALYSIS OF DYNAMIC FLOW BEHAVIOR IN PITCHING MANEUVER显示文摘ANALYSIS OF DYNAMIC FLOW BEHAVIOR IN PITCHING MANEUVERChenNanqian;LiuRizhi;MaZongjiang(InstituteOfFluidMechanics,BeijingUnive... | Chen Nanqian Liu Rizhi Ma Zongjiang(Institute Of Fluid Mechanics, Beijing University Of Aeronauticsand Astronautics, Beijing, China, 100083) | 1996 | Chinese Journal of Aeronautics1996，9，4： | 0 |
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