By using zeolite-supported alkali methoxide liquid-film catalysts, such as KOCH3-PEG/NaZSM-5(or NaY), the heterogeneous catalytic carbonylation of methanol to methyl formate was realized in a fixed-bed continuous flow...By using zeolite-supported alkali methoxide liquid-film catalysts, such as KOCH3-PEG/NaZSM-5(or NaY), the heterogeneous catalytic carbonylation of methanol to methyl formate was realized in a fixed-bed continuous flow reactor. Under the reaction conditions of 353 K,1.0 MPa, feedgas composition of CO/CH3OH=6.48(molar ratio) and GHSV=11160h-1, the STY of MF reached up to 1900mg/(h·gcat.), with selectivity to MF at 100%.The experimental results indicated that methoxide anion CH3O- was crucial catalyti-cally active species. The role of the additive polyethylene glycol(PEG) in generating a liquid-film environment, in which the carbonylation reaction would take place, is important,espe-cially in the case of supports with large pore-diameter as SiO2. However, in the case of some support materials with abundant micropore structure such as ZSM-5 or Y-type zeolite, it is probable to design and select appropriate reaction conditions(mainly, temperature and partial pressure of methanol in feedstream) to generate directly liquid-film of methanol by means of the "capillary condensation effect", as a consequence, addition of PEG may be cut down, or even, avoided.展开更多
A novel supported liquid phase film catalyst: Supported PdCl2-(n-C4H9),N+Cl- molten salts was found to be an effective catalyst with good stability for selective hydrodechlorination of CCl2F2 (CFC-12) to its alternati...A novel supported liquid phase film catalyst: Supported PdCl2-(n-C4H9),N+Cl- molten salts was found to be an effective catalyst with good stability for selective hydrodechlorination of CCl2F2 (CFC-12) to its alternatives CH2F2 and CHClF2. Addition of CoCl2, GaCl3 and CuCl2 to PdCl2-(n-C4H9),N+Cl- modifies the catalytic performance of supported molten salts.展开更多
文摘By using zeolite-supported alkali methoxide liquid-film catalysts, such as KOCH3-PEG/NaZSM-5(or NaY), the heterogeneous catalytic carbonylation of methanol to methyl formate was realized in a fixed-bed continuous flow reactor. Under the reaction conditions of 353 K,1.0 MPa, feedgas composition of CO/CH3OH=6.48(molar ratio) and GHSV=11160h-1, the STY of MF reached up to 1900mg/(h·gcat.), with selectivity to MF at 100%.The experimental results indicated that methoxide anion CH3O- was crucial catalyti-cally active species. The role of the additive polyethylene glycol(PEG) in generating a liquid-film environment, in which the carbonylation reaction would take place, is important,espe-cially in the case of supports with large pore-diameter as SiO2. However, in the case of some support materials with abundant micropore structure such as ZSM-5 or Y-type zeolite, it is probable to design and select appropriate reaction conditions(mainly, temperature and partial pressure of methanol in feedstream) to generate directly liquid-film of methanol by means of the "capillary condensation effect", as a consequence, addition of PEG may be cut down, or even, avoided.
文摘A novel supported liquid phase film catalyst: Supported PdCl2-(n-C4H9),N+Cl- molten salts was found to be an effective catalyst with good stability for selective hydrodechlorination of CCl2F2 (CFC-12) to its alternatives CH2F2 and CHClF2. Addition of CoCl2, GaCl3 and CuCl2 to PdCl2-(n-C4H9),N+Cl- modifies the catalytic performance of supported molten salts.
