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[1]荆开石,崔咪芬,费兆阳,等.HZSM-5分子筛硅铝比对催化氯甲烷偶联制备低碳烯烃性能的影响[J].南京工业大学学报(自然科学版),2018,40(05):14-19.[doi:10.3969/j.issn.1671-7627.2018.05.003]
 JING Kaishi,CUI Mifen,FEI Zhaoyang,et al.Effectes of silica-alumina molar ratios of HZSM-5 molecular sieves on catalytic performance of chloromethane coupling to lower olefins[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2018,40(05):14-19.[doi:10.3969/j.issn.1671-7627.2018.05.003]
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HZSM-5分子筛硅铝比对催化氯甲烷偶联制备低碳烯烃性能的影响()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
40
期数:
2018年05期
页码:
14-19
栏目:
出版日期:
2018-09-20

文章信息/Info

Title:
Effectes of silica-alumina molar ratios of HZSM-5 molecular sieves on catalytic performance of chloromethane coupling to lower olefins
文章编号:
1671-7627(2018)05-0014-06
作者:
荆开石1崔咪芬1费兆阳12陈献1汤吉海1乔旭12
1.南京工业大学 化工学院,江苏 南京 210009; 2.南京工业大学 材料化学工程国家重点实验室,江苏 南京 210009
Author(s):
JING Kaishi1CUI Mifen1FEI Zhaoyang12CHEN Xian1TANG Jihai1QIAO Xu12
1.College of Chemical Engineering,Nanjing Tech University,Nanjing 210009,China; 2.State Key Laboratory of Materials-Oriented Chemical Engineering,Nanjing Tech University,Nanjing 210009,China
关键词:
氯甲烷 HZSM-5分子筛 低碳烯烃 硅铝比
Keywords:
chloromethane HZSM-5 molecular sieve lower olefin SiO2/Al2O3 molar ratio
分类号:
TQ032.4
DOI:
10.3969/j.issn.1671-7627.2018.05.003
文献标志码:
A
摘要:
采用硅铝比(n(SiO2)/n(Al2O3))分别为25、38、50、80、200和300的HZSM-5分子筛作为催化氯甲烷偶联制备低碳烯烃(MeXTO)的催化剂,系统地考察HZSM-5分子筛的硅铝比、结构与表面性质对催化性能的影响。利用X线衍射仪(XRD)、N2吸附-脱附、NH3程序升温脱附(NH3-TPD)和O2程序升温氧化(O2-TPO)对催化剂进行表征。结果表明:随着硅铝比的增加,分子筛表面的中强酸酸量逐渐降低,酸强度也逐渐减弱,氯甲烷的转化率逐渐降低,而低碳烯烃的总选择性逐渐增大,催化剂的稳定性也逐渐增强,其中,硅铝比为80的HZSM-5分子筛因具有较适宜的表面酸强度和酸量,催化性能最优。在反应温度450 ℃、空速2.45 h-1下,氯甲烷的转化率达到92.9%,低碳烯烃的选择性达78.3%,反应稳定性达28 h。
Abstract:
HZSM-5 molecular sieves with different SiO2/Al2O3 molar ratios of 25,38,50,80,200 and 300 were selected as the catalysts for the catalytic coupling of chloromethane to lower olefins(MeXTO).The effects of silica-alumina molar ratios,structure,and surface property of HZSM-5 molecular sieves on catalytic performance were studied.The HZSM-5 molecular sieves were characterized by X-ray diffraction(XRD),nitrogen adsorption-desorption,ammonia temperature programmed desorption(NH3-TPD)and oxygen temperature programmed oxidation(O2-TPO)were investigated systematically.Results showed that the increase ratios of SiO2/Al2O3 could reduce the acid strength and acid amount of HZSM-5 molecular sieves,which resulted in the decrease conversion of chloromethane and increasing selectivity of lower olefins as well as the prolonged life time of the catalysts.Due to its appropriate acid strength and acid amount in the surface,HZSM-5 molecular sieve with a SiO2/Al2O3 of 80,showed the best catalytic performance.When the reaction temperature was 450 ℃ and the space velocity was 2.45 h-1,conversion of chloromethane and selectivity of lower olefins were 92.9% and 78.3%,respectively,and the reaction could be stable for 28 h.

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备注/Memo

备注/Memo:
收稿日期:2017-03-09
基金项目:江苏省产学研前瞻性联合研究项目(BY2015005-02); 江苏省创新基金(SJLX15_0345)
作者简介:荆开石(1991—),男,山东淄博人,硕士,主要研究方向为绿色化工及工业催化; 崔咪芬(联系人),教授,E-mail:mfcui@njtech.edu.cn.
引用本文:荆开石,崔咪芬,费兆阳,等.HZSM-5硅铝比对催化氯甲烷偶联制备低碳烯烃性能的影响[J].南京工业大学学报(自然科学版),2018,40(5):14-19..
更新日期/Last Update: 2018-09-30