摘要
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.
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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第8期1364-1366,共3页
Chemical Journal of Chinese Universities
基金
国家教育委员会博士点基金
关键词
甲醇
甲酸甲酯
多相催化
羰化
MF
催化剂
Methanol, Methyl formate, Heterogeneous carbonylation, Supported liquid-film catalyst
