3-SCR;改性"/> x與其他組分的相互作用，進(jìn)而提高VOx的可還原性及V5+的占比，使Sn-V/UiO-66催化劑表面的VOx提供更多的酸性位點(diǎn)。中毒后的K-Sn-V/UiO-66催化劑仍然具有較高的總酸量和較強(qiáng)的氧化還原性，表明Sn-V/UiO-66催化劑具有優(yōu)異的抗堿金屬中毒能力。"/>

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摻雜Sn對(duì)V/UiO-66催化劑抗堿金屬性能的影響
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中國(guó)建筑材料科學(xué)研究總院 陶瓷科學(xué)研究院，北京 100024

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NKR&DPC（2016YFC0209302）


Effect of Sn Doping on Alkali Metal Resistance of V/UiO-66 Catalyst
Author:
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Ceramics Science Institute, China Building Materials Academy, Beijing 100024, China

Fund Project:

National Key Research and Development Program of China (2016YFC0209302)

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    摘要:

    采用浸漬法，以UiO-66為載體，制備了V/UiO-66及改性Sn-V/UiO-66催化劑，并對(duì)催化劑的堿金屬鉀中毒進(jìn)行了模擬，探討了釩鈦催化劑的反應(yīng)機(jī)理和失活機(jī)理。結(jié)果表明，K負(fù)載后催化劑的晶型變化不大并且催化劑比表面積的變化呈現(xiàn)不規(guī)律波動(dòng)。負(fù)載了堿金屬以后，催化劑的金屬氧化還原性能和表面酸量迅速降低，這是催化劑活性降低的主要原因。添加Sn能夠增強(qiáng)VOx與其他組分的相互作用，進(jìn)而提高VOx的可還原性及V5+的占比，使Sn-V/UiO-66催化劑表面的VOx提供更多的酸性位點(diǎn)。中毒后的K-Sn-V/UiO-66催化劑仍然具有較高的總酸量和較強(qiáng)的氧化還原性，表明Sn-V/UiO-66催化劑具有優(yōu)異的抗堿金屬中毒能力。

    Abstract:

    V/UiO-66 catalyst and modified Sn-V/UiO-66 catalyst were prepared by impregnation method with UiO-66 as carrier, and their potassium poisoning was simulated. The reaction and deactivation mechanisms of vanadium-titanium catalyst were analyzed. Results demonstrate that the crystallographic form of catalysts barely changes after K-loading, and the specific surface area of the catalysts has an irregular fluctuation. The catalyst activity is decreased rapidly after the alkali metal was loaded due to the degraded metal redox performance and the rapidly decreased surface acid content of the catalysts. The addition of Sn can enhance the interaction between VOx and other components, which thereby increases the V5+ content and reducibility of VOx. Thus, VOx on the surface of Sn-V/UiO-66 catalysts can provide more acid sites. The poisoned K-Sn-V/UiO-66 catalyst still has high total acid content and strong redox property, presenting the high resistance of Sn-V/UiO-66 catalyst against alkali metal poisoning.

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吳彥霞,陳玉峰,梁海龍,胡利明,王春朋.摻雜Sn對(duì)V/UiO-66催化劑抗堿金屬性能的影響[J].稀有金屬材料與工程,2023,52(1):41~47.[Wu Yanxia, Chen Yufeng, Liang Hailong, Hu Liming, Wang Chunpeng. Effect of Sn Doping on Alkali Metal Resistance of V/UiO-66 Catalyst[J]. Rare Metal Materials and Engineering,2023,52(1):41~47.]
DOI：10.12442/j. issn.1002-185X.20220282

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  • 收稿日期:2022-04-07
  • 最后修改日期:2022-08-05
  • 錄用日期:2022-08-11
  • 在線發(fā)布日期: 2023-02-09
  • 出版日期: 2023-02-08