废弃SCR脱硝催化剂资源化制备再生钛钨粉的研究

摘要以蜂窝式废弃SCR脱硝催化剂为原料，采用常温湿法浸出工艺，在不同的反应条件下制备了一系列再生钛钨粉产品，根据其中杂质硅、铝、砷、钠、钾和钙等元素的含量和比表面积筛选出最适宜的浸出工艺条件[w（氢氟酸）为2%，浸出时间为3 h]。以最适宜条件下制备的再生钛钨粉为原料制备了新的脱硝催化剂，与工业钛钨粉制备的催化剂相比具有较高的脱硝率。采用X射线荧光光谱（XRF）、氮吸附BET（N₂-BET）、X射线衍射（XRD）及透射电镜（TEM）手段表征了其元素含量、表面性质、晶型结构和微观形貌，并与工业钛钨粉制备的催化剂表征结果对比后发现，再生钛钨粉为原料制备的新的脱硝催化剂之所以具有较高的脱硝率，是因为废脱硝催化剂经过氢氟酸浸出反应后制备的再生钛钨粉所制备的催化剂不仅具有与工业钛钨粉所制备催化剂相似的化学成分、比表面积、晶型结构和微观形貌，而且经过浸出反应制备的再生钛钨粉还保留了一部分活性V₂O₅。此外，再生钛钨粉具有较好的催化稳定性，拥有良好的工业化前景。

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	李彬彬

关键词：脱硝催化剂浸出钛钨粉再生

Abstract： Using the honeycomb waste selective catalytic reduction (SCR) denitration catalyst as raw material, a series of regenerated titanium tungsten powder products were prepared under normal temperature. The best reaction condition was screened according to the contents of impurities such as silicon, aluminum, arsenic, sodium, potassium and calcium, and the specific surface areas. The optimum reaction conditions are that the concentration of hydrofluoric acid is 2% and the reaction time is 3 h. A new denitration catalyst prepared from the regenerated titanium tungsten power had a higher denitration rate than that that of industrial titanium tungsten powder. The X-ray fluorescence (XRF), nitrogen adsorption BET (N₂-BET), X-ray diffraction (XRD) and transmission electron microscope (TEM) were used to characterize the elemental content, surface properties, crystal structure and microscopic appearance. It is found that the catalyst prepared from the regenerated titanium tungsten powder has similar chemical composition, specific surface area, crystal structure and microstructure with that prepared from the industrial titanium tungsten powder, and still retains a part of the active V₂O₅. In addition, the regenerated titanium tungsten powder shows good catalytic stability and industrial prospects.

Keywords： denitration； catalyst； leaching； titanium tungsten powder； regeneration

Received 2019-04-15;

Corresponding Authors: 李彬彬,E-mail:libinbin621@163.com。 Email: libinbin621@163.com

About author: 李彬彬(1988-),男,工程师,现从事工业固(危)废资源化利用方面的研究。

引用本文:

李彬彬.废弃SCR脱硝催化剂资源化制备再生钛钨粉的研究[J]. 化学工业与工程, 2020,37(3): 60-66,73

Li Binbin.Research on the Preparation of Regenerated Titanium Tungsten Powder by Recycling SCR Denitration Catalyst[J]. Chemcial Industry and Engineering, 2020,37(3): 60-66,73

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