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ZSM-5 synthesis by the assistance of biomass and biomass-derivate compounds
Microporous and Mesoporous Materials ( IF 4.8 ) Pub Date : 2017-12-24 , DOI: 10.1016/j.micromeso.2017.12.022
Elisa S. Gomes , Donato A.G. Aranda , Marcelo M. Pereira , Benoît Louis

ZSM-5 zeolites with tailored properties were successfully synthesized in the presence of biomass-derivative compounds following conventional hydrothermal route. The strategy consisted of introducing, along with silica and alumina precursors, either sugar cane bagasse itself or biomass-derivate compounds obtained by hydrolysis of the sugar cane. As-prepared ZSM-5 catalysts were thoroughly characterized by XRD, XRF, SEM, nitrogen sorption and H/D isotope exchange techniques. The catalysts were evaluated both in the cracking of n-hexane and the methanol conversion into hydrocarbons. Our approach yielded solely ZSM-5 phase with broad differences in their intrinsic properties: external surface area (between 51 and 153 m2 g−1); 8 < Si/Al < 29, thus leading up to high Brønsted acid sites density; crystal size (from 0.3 to 13 μm) and peculiar morphologies. The high Al-content ZSM-5 led to achieve the higher n-hexane cracking activity. The ZSM-5 with the highest external area and higher Si/Al (SAR) converted methanol mainly into light olefins, whilst, the ZSM-5 material with the lower external area and lower SAR yielded gasoline formation.



中文翻译:

借助生物质和生物质衍生化合物合成ZSM-5

按照常规水热法,在存在生物质衍生化合物的情况下,成功合成了具有定制性能的ZSM-5沸石。该策略包括与二氧化硅和氧化铝前体一起引入甘蔗渣本身或通过甘蔗水解获得的生物质衍生化合物。通过XRD,XRF,SEM,氮吸附和H / D同位素交换技术对制得的ZSM-5催化剂进行了全面表征。在正己烷裂化和甲醇转化为烃的过程中都对催化剂进行了评估。我们的方法仅产生ZSM-5相,它们的内在特性差异很大:外表面积(介于51和153 m 2  g -1之间)); 8 <Si / Al <29,从而导致布朗斯台德酸位点密度高;晶体尺寸(从0.3到13μm)和特殊的形貌。高铝含量的ZSM-5导致获得更高的正己烷裂解活性。具有最高外部面积和较高Si / Al(SAR)的ZSM-5将甲醇主要转化为轻质烯烃,而具有较低外部面积和SAR较低的ZSM-5材料产生了汽油。

更新日期:2017-12-24
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