摘要
Thermal decomposition of supported magnesium formate has been studied by gas chro- matography.The reaction paths of decomposition of supported magnesium formate depend on the nature of the supports.For Mg(HCO_2)_2/HZSM-5,the zeolite behaves as a dehydration catalyst to give CO and H_2O at lower temperatures;when the zeolite is modified by phosphorus,the methanation reaction will be partly restrained.In the case of Mg(HCO_2)_2/AC,strong adsorption of CO_2 leads to the formation of the shoulder peak of CO_2 at higher temperatures,however,CH_4 disappears after modified by phosphorus.For Mg(HCO_2)_2/Al_2O_3,the dehydrogenation of HCO_2^- takes place on the surface of Al_2O_3.The decomposition of Mg(HCO_2)_2 on SiO_2 in hydrogen yields two peaks of CO and only one appears after modified by phosphorus.When Mg(HCO_2)_2 decomposes on MgO,the first peak of CO_2 arises from the reaction of surface Mg^(2+) with HCO_2^- from dissociated Mg(HCO_2)_2.
Thermal decomposition of supported magnesium formate has been studied by gas chro- matography.The reaction paths of decomposition of supported magnesium formate depend on the nature of the supports.For Mg(HCO_2)_2/HZSM-5,the zeolite behaves as a dehydration catalyst to give CO and H_2O at lower temperatures;when the zeolite is modified by phosphorus,the methanation reaction will be partly restrained.In the case of Mg(HCO_2)_2/AC,strong adsorption of CO_2 leads to the formation of the shoulder peak of CO_2 at higher temperatures,however,CH_4 disappears after modified by phosphorus.For Mg(HCO_2)_2/Al_2O_3,the dehydrogenation of HCO_2^- takes place on the surface of Al_2O_3.The decomposition of Mg(HCO_2)_2 on SiO_2 in hydrogen yields two peaks of CO and only one appears after modified by phosphorus.When Mg(HCO_2)_2 decomposes on MgO,the first peak of CO_2 arises from the reaction of surface Mg^(2+) with HCO_2^- from dissociated Mg(HCO_2)_2.
基金
Project supported by Fok Ying Tung Education Foundation and the State Education Commission of China(FEYUT).
