화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.38, No.7, 1381-1393, July, 2021
DOI10.1007/s11814-021-0793-5  Export Citation
Template-assisted preparation of metal-modified SAPO-34 molecular sieves for the catalysis of methanol-to-olefins
Jihui Yao1, Jiapeng Jiao1, Ruiqiang Liu*1, Fei Zha1, †, Xiaojun Guo1, Xiaohua Tang1, Haifeng Tian1, and Yue Chang1, 2
  • 1College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, Gansu, China
  • 2Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Lanzhou 730070, Gansu, China
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To improve the dispersion of metals and to enhance the catalytic performance of SAPO-34 molecular sieves, the template-assisted method was applied to synthesize Co, Ni and Zn modified SAPO-34 molecular sieves by using palygorskite as silicon source and tetraethylammonium hydroxide as template. The metal modified SAPO-34 molecular sieves were characterized by XRD, SEM, XPS, N2-adsorption-desorption, NH3-TPD, FTIR, ICP-AES and TG. The N atoms of tetraethylammonium hydroxide exhibited the different forces to three metal ions, thus the acidity of the molecular sieves was further regulated. Compared with metal modified SAPO-34 molecular sieves prepared by impregnation, metal modified SAPO-34 molecular sieves prepared by template-assisted maintained higher surface area, bigger pore volume and better dispersion of metals. The catalytic performance of metal modified SAPO-34 molecular sieves prepared by template-assisted method in the reaction of methanol-to-olefins (MTO) was investigated in the fixed bed reactor. Under the reaction conditions that the reaction temperature was 400 °C, the reaction pressure was 0.1 MPa, the feed WHSV was 2.0 h-1 and the mass of catalyst was 0.5 g, Ni modified SAPO-34 molecular sieves exhibited great methanol conversion and high selectivity to light olefins. The selectivity of light olefins reached 95.7%.
Keywords:SAPO-34 Molecular Sieves;Metal Modification;Palygorskite;MTO;Template-assisted;Light Olefins
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