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不同前驱体的镍盐整体式催化剂催化分解臭氧

作者:时间:2019-12-02点击数:

全文下载:      201906003.pdf


文章编号: 1672-6987201906-0027-04DOI10.16351/j.1672-6987.2019.06.003

 

 余会发

(浙江师范大学 物理化学研究所, 浙江 金华 321004)

 

摘要: 分别以Ni(NO3)2·6H2ONiONiCl2为前驱体,加入拟薄水铝石,用球磨机球磨,所得浆料用堇青石浸渍,分别制得Ni-NNi-ONi-Cl整体式催化剂,然后进行催化分解臭氧活性测试,发现以Ni-N为前驱体的催化剂活性最高,臭氧分解率达到98%,催化剂活性稳定。以Ni-Cl为前驱体的催化剂活性最差,臭氧分解率在30%,并且催化剂易失活。通过XRDXPSRaman等表征,发现以Ni-N为前驱体的催化剂的晶体颗粒小,晶体缺陷多,是提高催化剂活性的主要原因。以Ni-Cl为前驱体的催化剂失活的主要原因在于存在NiCl键,由于Cl的电负性大,使得Ni的电子结合能发生偏移,不易失去电子,因此催化活性低。

关键词: 臭氧分解; 催化剂; 失活


中图分类号: O 643文献标志码: A

引用格式: 余会发. 不同前驱体的镍盐整体式催化剂催化分解臭氧\[J\]. 青岛科技大学学报(自然科学版), 2019406): 27-30.


YU Huifa. Catalytic decomposition of ozone over monolithic catalysts with different nickel salt precursors\[J\]. Journal of Qingdao University of Science and TechnologyNatural Science Edition), 2019, 40(6)27-30.


Catalytic Decomposition of Ozone over Monolithic Catalysts with

Different Nickel Salt Precursors

YU Huifa

(Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China)


Abstract: Ni-N,Ni-O and Ni-Cl monolithic catalysts were prepared by impregnating the slurry with cordierite, using Ni(NO3)2·6H2O, NiO and NiCl2 as precursors, adding pseudo-boehmite and ball milling with ball mill, respectively. Then the catalytic ozone decomposition activity of Ni-N as precursor was tested. It was found that the catalytic activity of Ni-N as precursor was the highest, the ozone decomposition rate reached 98%, and the catalytic activity was stable. The catalyst with Ni-Cl as the precursor had the worst activity,the ozone decomposition rate was 30%, and the catalyst was easily deactivated. XRD,XPS and Raman characterization showed that the catalyst with Ni-N as the precursor had small crystal particles and many crystal defects, which was the main reason for improving the activity of the catalyst. The main reason for the deactivation of catalyst using Ni-Cl as precursor is the existence of NiCl bond. Because of the large electronegativity of Cl, the electron binding energy of Ni shifts and the electrons are not easily lost, so the catalytic activity is low.

Key words: ozone decomposition; catalyst; deactivation

 

收稿日期:  2018-12-28

作者简介: 余会发(1990—),男,硕士研究生.

 

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