基于UiO-66热解制备多孔氧化锆及其热解催化生物质性能研究

Study on the Preparation of Porous ZrO_(2) by Pyrolysis of UiO-66 and Its Catalytic Performance in Biomass Pyrolysis

生物质材料通过催化热解产生的氧杂环类化合物中5-羟甲基糠醛具有广泛的应用。本文利用Zr^(4+)离子与对苯二甲酸形成的金属有机框架材料(UiO-66)作为牺牲模版,分别采用分段煅烧以及直接煅烧两种方式制备氧化锆催化剂。结果表明以UiO-66为模板,采用分段式煅烧以及直接空气气氛煅烧两种方式衍生得到的氧化锆固体酸催化剂形貌相似,呈现出纳米针状疏松结构。比较而言,采用分段式煅烧得到的氧化锆催化剂比表面积更加优异,能有效地提高生物质催化产物中5-羟甲基糠醛的含量。

Biomass materials can produce a series of oxygen-containing heterocyclic compounds through catalytic pyrolysis,among which 5-hydroxymethylfurfural,as a marker of the Maillard reaction,has widespread applications in the food industry.This paper utilizes a metal-organic framework material(UiO-66)formed by Zr^(4+) ions and terephthalic acid as a sacrificial template,employing both segmented calcination and direct calcination methods to prepare ZrO_(2) catalysts.The structure and morphology of the catalysts were characterized using X-ray diffraction(XRD),scanning electron microscopy(SEM),and so on,and the catalytic performance in biomass pyrolysis was tested using pyrolysis-gas chromatography/mass spectrometry(Py-GC/MS).The results show that the ZrO_(2) solid acid catalysts derived using UiO-66 as a template,through both segmented calcination and direct air atmosphere calcination,have similar morphologies which exhibiting a loose nanoneedle structure.Comparatively,the ZrO_(2) catalyst obtained through segmented calcination has a superior specific surface area and more catalytic sites,which effectively enhances the content of 5-hydroxymethylfurfural in the biomass catalytic products.