以菱镁矿轻烧粉、废弃水口和硅灰为原料制备多孔堇青石材料,研究分析菱镁矿轻烧粉中氧化镁对制备多孔堇青石材料致密度、结晶相组成及显微结构的影响。用XRD法和SEM法表征多孔堇青石材料中的结晶相和显微结构。结果表明:利用高温固相反应烧结,可以制备出以堇青石为主晶相的多孔堇青石材料。但菱镁矿轻烧粉的过量引入会降低多孔堇青石材料的孔隙率,导致合成材料中镁橄榄石相增多。

Porous cordierite was prepared with powder of light-burned magnesia, waste nozzle and silica fume as raw materials. The paper analyzed the effects of magnesium oxide on bulk density,crys-tialline composition and microstructure of the porous cordierite,which were characterized by XRD and SEM. The result shows that the porous cordierite material with cordierite as major crystal phase can be prepared by high-temperature solid-phase sintering method. But excessive addition of light-burned magnesite will reduce the porosity and increase the boltonite phase.

本文采用不同的酸对蜂窝式堇青石进行处理,研究酸蚀处理对其组成和孔结构的影响。并以自制的二氧化硅溶胶为第二载体对酸处理后的堇青石进行涂敷。采用XRD、N2等温吸附-脱附、SEM等手段对二氧化硅进行表征。结果表明:酸蚀处理并不改变堇青石的晶相结构;经酸处理后的堇青石其比表面积有不同程度的增加;而经二氧化硅涂敷后的堇青石比表面积可达93.35m2/g。

In this article the effects of different acid pretreatment conditions on the structure and characteristics of cordierite were investigated.And SiO2/cor was preparaed by using prepared SiO2 as coating, pretreated cordierite as support. N2 adsorption-desorption isotherms, XRD, SEM and some other experiment methods were used to investigate the structure and other physical properties of the samples. The results showed that no changes for the crystalline phase observed after acid treatment, acid pretreatment enhanced the specific surface araes of cordierite, and the specific surface area of the coating cordierite was increased to93.35 m2/g.

采用浸渍法制备了以堇青石为基底、氧化铈为活性组分的整体式脱硝催化剂CeO2/TiO2/堇青石催化剂。通过与商业钒基催化剂（V2O5-WO3/TiO2/堇青石）的对比研究发现，CeO2/TiO2/堇青石催化剂表现出了优良的抗硫抗水性能，经过30h抗硫抗水实验，CeO2/TiO2/堇青石催化剂的氮氧化物转化率仍能保持在70％以上，仅下降了5％。BET、XRD、FT-IR和TG表征结果表明，在含硫含水气氛中反应时，CeO2/TiO2/堇青石和V2O5-WO3/TiO2/堇青石催化剂表面均有硫酸铵盐的生成，且前者的生成量明显低于后者。NH3-DRIFT分析结果表明，在含硫含水气氛中两种催化剂表面Br？nsted酸性都被增强，而Lewis酸性有所减弱。进一步的XPS分析结果表明，烟气中的SO2＋H2O会使催化剂表面Ce4＋向Ce3＋发生转化，从而导致化学吸附氧含量增加，这是CeO2/TiO2/堇青石催化剂具有优良抗硫抗水性能的重要原因。

A monolithic CeO2/TiO2/cordierite deNOx catalyst was prepared by an impregnation method, with cordierite as the substrate and CeO2 as the active component.The CeO2/TiO2/codr ierite catalyst exhibits exceleln t resistance against SO2 and H2 O in the selective catayl tic reduction ( SCR) of NOx with NH3 , compared with the commercial vanadium-based catalyst ( V2 O5-WO3/TiO2/cordierite);the CeO2/TiO2/cordierite catalyst gives a conversion of NOxa bove 70%after 30h rse istance test ga ainst SO2+H2 O,o nly declined by 5%.BET, XRD, FT-IR and TG reslu ts indicated that ammonium sulfate is formed on the surface of both CeO2/TiO2/c ordierite and V2 O5-WO3/TiO2/corid erti e caat yl stsdu ring the SCR reaction in the presence of SO2 and H2 O, but on the former, the amount of ammonui m sulfate deposited is much less.NH3-DR IFT results us ggested that the surface Br?nsted acidity is strengthened, whereas the surface Lewis acidity is weakened during the SCR reaction in the presence of SO2

近年来,堇青石整体式催化剂由于具有低热膨胀性、比表面积大、优良的机械强度和高熔点等特点,在尾气废气处理、化工产品的合成、新能源处理、生化等多个领域得到了广泛应用,并表现出了良好的性能。综述了堇青石整体式催化剂制备的过程及研究进展,并对堇青石整体式催化剂的前景做了展望。

In recent years, cordierite monolithic catalyst has been widely used in many fields, such as exhaust waste gas processing, synthesis of chemical products, dealing with the new energy, biochemistry and so on, because it has low thermal expansion, high specific surface area, excellent mechanical strength and high melting point. In this paper, preparation process and research progress of the cordierite monolithic catalyst were reviewed, and development prospect of the cordierite monolithic catalyst was discussed.

为了综合利用煤矸石,以煤矸石、滑石等为原料,按堇青石的理论组成配料,分别外加质量分数为0、5%、10%、15%、20%的活性炭粉为造孔剂,在1 400℃下分别保温3和6 h烧结后制备了堇青石多孔陶瓷,通过检测显气孔率和常温抗折强度及其显微结构分析探讨了其合成工艺制度。结果表明:利用煤矸石为主原料,外加5%(w)的活性炭为造孔剂,在1 400℃下保温6 h可以合成性能优良的堇青石多孔陶瓷。所合成的堇青石多孔陶瓷的抗折强度为29.1 MPa,显气孔率为39.8%;显微结构分析显示,该多孔陶瓷中以堇青石相为骨架,内部形成了贯通气孔的多孔结构。

For comprehensive utilization of coal gangue,porous cordierite ceramics were prepared using coal gangue and talc as starting materials,batching according to the theoretical formulation of cordierite, extra adding activated carbon powder (5%,10%,15%,20%,in mass,respectively)as the pore-forming agent,firing at 1 400℃for 3 h and 6 h,respectively.The apparent porosity,cold modulus of rupture and mi-crostructure were tested to investigate the synthesis process of the ceramics.The results show that the por-ous cordierite ceramics with good performance can be synthesized at 1 400 ℃for 6 h with 5 mass%extra-added activated carbon;the obtained ceramic specimen has cold modulus of rupture of 29.1 MPa and ap-parent porosity of 39.8%.The microscopic structure analysis shows that the skeleton is composed of cordi-erite phase and a porous structure with through pores forms.