In this work, pyrolysis photoionization time-of-flight mass spectrometry （Py-PI-TOFMS） was applied to study the behavior of ammonia poisoning on H-form ultra stable Y （HUSY） zeolite for the catalytic pyrolysis of ...In this work, pyrolysis photoionization time-of-flight mass spectrometry （Py-PI-TOFMS） was applied to study the behavior of ammonia poisoning on H-form ultra stable Y （HUSY） zeolite for the catalytic pyrolysis of polypropylene （PP）. Firstly, ammonia poisoning on HUSY was performed to obtain the suitable catalysts with different strength and amounts of acid sites. Secondly, online photoionization mass spectra for the pyrolysis products of PP and HUSY with various acid strength were recorded at different pyrolysis temperatures. Finally, the formation curves of various pyrolysates of PP/HUSY with the increase of temperature were determined. Our results indicate that the formation temperatures, yields and selectivity of the pyrolysis products of PP demonstrate obvious relationship with the acid strength of HUSY.展开更多
从工业硅酸盐水泥熟料中分离出硅酸盐矿物,制备了C S H凝胶,并利用能谱、红外光谱、X光电子能谱等技术研究了K+和Na+在C S H凝胶中的存在形式.研究结果显示,C S H凝胶中结合的K+,Na+量随C S H凝胶中n(CaO)/n(SiO2)的降低而增加;K+,Na+在...从工业硅酸盐水泥熟料中分离出硅酸盐矿物,制备了C S H凝胶,并利用能谱、红外光谱、X光电子能谱等技术研究了K+和Na+在C S H凝胶中的存在形式.研究结果显示,C S H凝胶中结合的K+,Na+量随C S H凝胶中n(CaO)/n(SiO2)的降低而增加;K+,Na+在C S H凝胶中均有2种存在形式,即既有通过表面力作用而吸附在C S H凝胶表面这种形式,也有通过化学键力结合在C S H凝胶结构中这种形式;在C S H凝胶的结构中,可能存在着Si—OK或Si—ONa基团,从而使K+,Na+可结合在C S H凝胶中.展开更多
The purpose of this study is to investigate the catalytic effects of alkali and alkaline earth metallic species （AAEM） on char conversion during the gasification in steam and the changes in ex-situ char reactivity i...The purpose of this study is to investigate the catalytic effects of alkali and alkaline earth metallic species （AAEM） on char conversion during the gasification in steam and the changes in ex-situ char reactivity in oxygen after the gasification in steam using different forms （i.e. H-form, Na-form） of Shengli brown coal. The surface area, AAEM concentration and carbon crystallite of chars were obtained to understand the change in char reactivity. It was found that not only Na concentration and carbon structure were the main factors governing the char reactivity in the atmosphere of steam and oxygen, but also they interacted each other. The presence of Na could facilitate the formation of disordering carbon structure in char, and the amorphous carbon structure would in turn affect the distribution of Na and thus its catalytic performance. The surface area and pore volume had very little relationship with the char＇s reactivity. Addi- tionally, the morphology of chars from different forms of coals were observed using scanning electron microscope （SEM）.展开更多
文摘In this work, pyrolysis photoionization time-of-flight mass spectrometry （Py-PI-TOFMS） was applied to study the behavior of ammonia poisoning on H-form ultra stable Y （HUSY） zeolite for the catalytic pyrolysis of polypropylene （PP）. Firstly, ammonia poisoning on HUSY was performed to obtain the suitable catalysts with different strength and amounts of acid sites. Secondly, online photoionization mass spectra for the pyrolysis products of PP and HUSY with various acid strength were recorded at different pyrolysis temperatures. Finally, the formation curves of various pyrolysates of PP/HUSY with the increase of temperature were determined. Our results indicate that the formation temperatures, yields and selectivity of the pyrolysis products of PP demonstrate obvious relationship with the acid strength of HUSY.
文摘从工业硅酸盐水泥熟料中分离出硅酸盐矿物,制备了C S H凝胶,并利用能谱、红外光谱、X光电子能谱等技术研究了K+和Na+在C S H凝胶中的存在形式.研究结果显示,C S H凝胶中结合的K+,Na+量随C S H凝胶中n(CaO)/n(SiO2)的降低而增加;K+,Na+在C S H凝胶中均有2种存在形式,即既有通过表面力作用而吸附在C S H凝胶表面这种形式,也有通过化学键力结合在C S H凝胶结构中这种形式;在C S H凝胶的结构中,可能存在着Si—OK或Si—ONa基团,从而使K+,Na+可结合在C S H凝胶中.
文摘The purpose of this study is to investigate the catalytic effects of alkali and alkaline earth metallic species （AAEM） on char conversion during the gasification in steam and the changes in ex-situ char reactivity in oxygen after the gasification in steam using different forms （i.e. H-form, Na-form） of Shengli brown coal. The surface area, AAEM concentration and carbon crystallite of chars were obtained to understand the change in char reactivity. It was found that not only Na concentration and carbon structure were the main factors governing the char reactivity in the atmosphere of steam and oxygen, but also they interacted each other. The presence of Na could facilitate the formation of disordering carbon structure in char, and the amorphous carbon structure would in turn affect the distribution of Na and thus its catalytic performance. The surface area and pore volume had very little relationship with the char＇s reactivity. Addi- tionally, the morphology of chars from different forms of coals were observed using scanning electron microscope （SEM）.
