CN107737589A - 一种低温scr催化剂的制备方法 - Google Patents
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- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 8
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- 238000000034 method Methods 0.000 description 2
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- 239000003638 chemical reducing agent Substances 0.000 description 1
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- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种低温SCR催化剂的制备方法,包括以下步骤:1)将以下重量比的各组分混合20‑30min制备混合粉:高岭土粉30‑40份、凹凸棒土粉25‑35份、二氧化锰12‑16份、五水氯化锡0.3‑0.9份、羧甲基纤维素3‑8份、白炭黑2‑3.5份;2)将步骤1)制备的混合粉中加入混合粉重量25‑45%的水,练泥5‑6次,后常温密封陈化6‑9h;3)模压成型;4)焙烧,自然冷却,即可制得低温SCR催化剂;本发明制备的催化剂机械性能好、热稳定性高、催化效率高。
Description
技术领域
本发明涉及一种低温SCR催化剂的制备方法。
背景技术
氮氧化物(NOx)是大气污染重要组成之一,而且由它引起的酸雨、光化学烟雾、近地面臭氧浓度增高以及灰霾天气,对人类健康和动植物生长造成极大的危害。因此,大气中NOx含量控制已经成为刻不容缓的事实。
目前利用NH3作为还原剂,选择性催化还原(SCR)脱除NOx技术是工业应用最广泛的烟气脱硝技术。商业使用的钒基催化剂多用于高温SCR 脱氮工艺。但锅炉烟气高温区存在大量飞灰和SO2,这些物质会造成催化剂中毒,减少催化剂的寿命。目前国内外低温SCR催化剂总面临着机械性能、热稳定性、催化效率等问题。
发明内容
本发明所要解决的技术问题是,克服以上现有技术的缺点:提供一种机械性能好、热稳定性高、催化效率高的低温SCR催化剂的制备方法。
本发明的技术解决方案如下:一种低温SCR催化剂的制备方法,包括以下步骤:
1)将以下重量比的各组分混合20-30min制备混合粉:高岭土粉 30-40份、凹凸棒土粉25-35份、二氧化锰 12-16份、五水氯化锡 0.3-0.9份、羧甲基纤维素 3-8份、白炭黑 2-3.5份;
2)将步骤1)制备的混合粉中加入混合粉重量25-45%的水,练泥5-6次,后常温密封陈化6-9h;
3)将步骤2)陈化后的泥料模压成型后于80-85℃烘干15-16h,然后于100-120℃下烘干3-8h;
4)将步骤3)烘干后的坯体先以10-12℃/min的速度升温至300-350℃保温3-4h,然后以8-12℃/min的速度升温至500-650℃保温5-6h,自然冷却,即可制得低温SCR催化剂。
作为优化,步骤3)中,模压成型为蜂窝状结构的坯体。
作为优化,步骤1)中混合粉组成为:高岭土粉 35-40份、凹凸棒土粉 30-35份、二氧化锰 15-16份、五水氯化锡 0.5-0.9份、羧甲基纤维素 3-5份、白炭黑 2-3.5份。
作为优化,步骤4)中,烘干后的坯体先以10℃/min的速度升温至350℃保温4h,然后以8℃/min的速度升温至650℃保温5h。
本发明的有益效果是:本发明通过合理的配方结合具体的工艺提高了低温SCR催化剂的机械性能、热稳定性以及催化效率。
具体实施方式
下面用具体实施例对本发明做进一步详细说明,但本发明不仅局限于以下具体实施例。
实施例一
一种低温SCR催化剂的制备方法,包括以下步骤:
1)将以下重量比的各组分混合20-30min制备混合粉:高岭土粉 40份、凹凸棒土粉 25份、二氧化锰 12份、五水氯化锡 0.9份、羧甲基纤维素 8份、白炭黑 3.5份;
2)将步骤1)制备的混合粉中加入混合粉重量25%的水,练泥6次,后常温密封陈化9h;
3)将步骤2)陈化后的泥料模压成型后于80-85℃烘干16h,然后于100-120℃下烘干8h;
4)将步骤3)烘干后的坯体先以12℃/min的速度升温至350℃保温4h,然后以12℃/min的速度升温至650℃保温6h,自然冷却,即可制得低温SCR催化剂。
实施例二
一种低温SCR催化剂的制备方法,包括以下步骤:
1)将以下重量比的各组分混合20-30min制备混合粉:高岭土粉 35份、凹凸棒土粉 35份、二氧化锰 16份、五水氯化锡 0.9份、羧甲基纤维素 5份、白炭黑 3.5份。
2)将步骤1)制备的混合粉中加入混合粉重量25%的水,练泥6次,后常温密封陈化9h;
3)将步骤2)陈化后的泥料模压成型为蜂窝状结构的坯体后于80℃烘干16h,然后于120℃下烘干8h;
4)将步骤3)烘干后的坯体先以10℃/min的速度升温至350℃保温4h,然后以8℃/min的速度升温至650℃保温5h,自然冷却,即可制得低温SCR催化剂。
实施例三
一种低温SCR催化剂的制备方法,包括以下步骤:
1)将以下重量比的各组分混合30min制备混合粉:高岭土粉 35份、凹凸棒土粉 30份、二氧化锰 13份、五水氯化锡 0.6份、羧甲基纤维素 5份、白炭黑 3份;
2)将步骤1)制备的混合粉中加入混合粉重量35%的水,练泥6次,后常温密封陈化9h;
3)将步骤2)陈化后的泥料模压成型后于85℃烘干16h,然后于120℃下烘干3h;
4)将步骤3)烘干后的坯体先以12℃/min的速度升温至350℃保温4h,然后以8℃/min的速度升温至650℃保温6h,自然冷却,即可制得低温SCR催化剂。
以上仅是本发明的特征实施范例,对本发明保护范围不构成任何限制。凡采用同等交换或者等效替换而形成的技术方案,均落在本发明权利保护范围之内。
Claims (4)
1.一种低温SCR催化剂的制备方法,其特征在于:包括以下步骤:
1)将以下重量比的各组分混合20-30min制备混合粉:高岭土粉 30-40份、凹凸棒土粉25-35份、二氧化锰 12-16份、五水氯化锡 0.3-0.9份、羧甲基纤维素 3-8份、白炭黑 2-3.5份;
2)将步骤1)制备的混合粉中加入混合粉重量25-45%的水,练泥5-6次,后常温密封陈化6-9h;
3)将步骤2)陈化后的泥料模压成型后于80-85℃烘干15-16h,然后于100-120℃下烘干3-8h;
4)将步骤3)烘干后的坯体先以10-12℃/min的速度升温至300-350℃保温3-4h,然后以8-12℃/min的速度升温至500-650℃保温5-6h,自然冷却,即可制得低温SCR催化剂。
2.根据权利要求1所述的低温SCR催化剂的制备方法,其特征在于:步骤3)中,模压成型为蜂窝状结构的坯体。
3. 根据权利要求1所述的低温SCR催化剂的制备方法,其特征在于:步骤1)中混合粉组成为:高岭土粉 35-40份、凹凸棒土粉 30-35份、二氧化锰 15-16份、五水氯化锡 0.5-0.9份、羧甲基纤维素 3-5份、白炭黑 2-3.5份。
4.根据权利要求1所述的低温SCR催化剂的制备方法,其特征在于:步骤4)中,烘干后的坯体先以10℃/min的速度升温至350℃保温4h,然后以8℃/min的速度升温至650℃保温5h。
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