Catalytic Methylation of Aromatic Hydrocarbons using CO2/H2 over Re/TiO2 and H‐MOR Catalysts. Issue 8 (6th March 2020)

• Record Type: Journal Article
• Authors: Ting, Kah Wei; Kamakura, Haruka; Poly, Sharmin S.; Toyao, Takashi; Hakim Siddiki, S. M. A.; Maeno, Zen; Matsushita, Koichi; Shimizu, Ken‐ichi
• Is Part Of: ChemCatChem. Volume 12:Issue 8(2020)
• Page Start: 2215
• Page End: 2220
• Publication Date: 2020-03-06
• Subjects: CO2 hydrogenation -- C-methylation -- Aromatics -- One-pot synthesis; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202000036
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: A combined catalyst comprising TiO2 ‐supported Re (Re(1)/TiO2 ; Re=1 wt%) and H‐MOR (SiO2 /Al2 O3 =90) was found to promote the methylation of benzene using CO2 and H2 . This catalytic system exhibited high performance with regard to the synthesis of methylated benzenes and gave high yields of total methylated products (up to 52 % benzene‐based yield and 42 % CO2 ‐based yield) under the reaction conditions employed in this study ( p CO2 =1 MPa; p H2 =5 MPa; T =250 °C; t =20 h) in a batch reactor. Catalyst screening demonstrated that a combination of Re(1)/TiO2 and H‐MOR (SiO2 /Al2 O3 =90) exhibited superior performance compared to other combinations of supported metal catalysts and zeolites in terms of both yield and selectivity for methylated benzenes. Abstract : The catalytic methylation of benzene using CO2 and H2 was performed in conjunction with a catalyst system comprising TiO2 ‐supported Re (Re(1)/TiO2 ) and H‐MOR (SiO2 /Al2 O3 =90). This catalyst combination gave high yields and selectivity for methylated benzene compounds. The catalytic methylation of naphthalene was also successfully carried out using a similar catalytic system consisting of Re(1)/TiO2 and H‐BEA (SiO2 /Al2 O3 =40).