CN105457632A - 一种单层涂覆三元催化剂的制备方法 - Google Patents
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Abstract
本发明公开了一种单层涂覆三元催化剂的制备方法,包括以下步骤:A、将Pd担载在氧化铝材料上制得Rh催化剂粉体,将Rh担载在稀土氧化物上制得Pb浆料;B、将Rh催化剂粉体和Pb浆料进行充分混合,再经过球磨机球磨形成催化剂涂层浆料;C、将惰性载体浸渍到催化剂涂层浆料中进行涂覆;D、将涂覆后的惰性载体烘干并进行焙烧,使得催化剂涂层固化在惰性载体上,即得到三元催化剂。本发明实现了将传统2~3层涂覆简化为单层涂覆,催化剂背压降低了15~30%,并简化了生产工艺,降低了生产成本;本发明的新鲜态活性测试较双层涂覆的催化剂表现出更好的催化活性,尤其是NOx的转化效率提升明显,老化后的催化剂活性也表现出与双层涂覆催化剂相当的活性。
Description
技术领域
本发明涉及汽车排气系统领域,尤其是一种单层涂覆三元催化剂的制备方法。
背景技术
目前,三元催化剂的涂层技术大多采用分层涂覆的方式,其中大部分为两层,也有部分催化剂采用三层涂覆的方式,这种涂覆方式的提高了催化剂的涂覆成本,也增加了催化剂的背压。也有部分研究者尝试采用单层涂覆的方式来降低成本,但是由于Pd,Rh易形成合金,导致催化剂的失活,因此也使得单层涂覆的方式受限。
发明内容
针对现有技术中的上述问题,本发明提出了一种单层涂覆三元催化剂的制备方法。
本发明的技术方案为:一种单层涂覆三元催化剂的制备方法,包括以下步骤:
A、将Pd担载在氧化铝材料上制得Rh催化剂粉体,将Rh担载在稀土氧化物上制得Pb浆料;
B、将Rh催化剂粉体和Pb浆料进行充分混合,再经过球磨机球磨形成催化剂涂层浆料;
C、将惰性载体浸渍到催化剂涂层浆料中进行涂覆;
D、将经过催化剂涂覆后的惰性载体取出并进行烘干,然后进行焙烧,使得催化剂涂层固化在惰性载体上,即得到单层涂覆三元催化剂。
进一步地,所述步骤A中Rh催化剂粉体的制备过程为:将活性组分Rh浸渍到氧化铝材料上得到Rh催化剂,然后进行烘干,再在300~900℃条件下进行焙烧,使得Rh在载体表面的分散与固化制得Rh催化剂粉体。
进一步地,所述步骤A中Pb浆料的制备过程为:将活性组分Rh浸渍到稀土氧化物材料上得到Pb催化剂,然后进行烘干,再在300~900℃条件下进行焙烧,使得Pb在载体表面的分散与固化制得粉状Pb催化剂,再加入适量去离子水制得Pb浆料。
进一步地,步骤D中的烘干温度为120℃,焙烧温度为300~900℃。
与现有技术相比,本发明的有益效果是:本发明通过将活性组分Pd和Rh分别担载在不同载体上,有效避免了Pd和Rh形成合金的问题,再混合制得涂层浆料,实现了将传统的2~3层涂覆简化为单层涂覆,使得催化剂的背压降低了15~30%,同时极大简化了生产工艺,降低了催化剂的生产成本;从催化效果来看,本发明的新鲜态活性测试较双层涂覆的催化剂表现出更好的催化活性,尤其是NOx的转化效率提升明显,老化后的催化剂活性也表现出与双层涂覆催化剂相当的活性。
具体实施方式
下面结合实施例对本发明中的技术方案进一步说明。
实施例一
一种单层涂覆三元催化剂的制备方法,包括以下步骤:
A、将活性组分Rh浸渍到氧化铝材料上得到Rh催化剂,然后进行烘干,再在300℃条件下进行焙烧,使得Rh在载体表面的分散与固化制得Rh催化剂粉体;将活性组分Rh浸渍到稀土氧化物材料上得到Pb催化剂,然后进行烘干,再在300℃条件下进行焙烧,使得Pb在载体表面的分散与固化制得粉状Pb催化剂,再加入适量去离子水制得Pb浆料;
B、将Rh催化剂粉体和Pb浆料进行充分混合,再经过球磨机球磨形成催化剂涂层浆料;
C、将惰性载体浸渍到催化剂涂层浆料中进行涂覆;
D、将经过催化剂涂覆后的惰性载体取出并在120℃条件下进行烘干,然后在300℃条件下进行焙烧,使得催化剂涂层固化在惰性载体上,即得到单层涂覆三元催化剂。
实施例二
一种单层涂覆三元催化剂的制备方法,包括以下步骤:
A、将活性组分Rh浸渍到氧化铝材料上得到Rh催化剂,然后进行烘干,再在600℃条件下进行焙烧,使得Rh在载体表面的分散与固化制得Rh催化剂粉体;将活性组分Rh浸渍到稀土氧化物材料上得到Pb催化剂,然后进行烘干,再在600℃条件下进行焙烧,使得Pb在载体表面的分散与固化制得粉状Pb催化剂,再加入适量去离子水制得Pb浆料;
B、将Rh催化剂粉体和Pb浆料进行充分混合,再经过球磨机球磨形成催化剂涂层浆料;
C、将惰性载体浸渍到催化剂涂层浆料中进行涂覆;
D、将经过催化剂涂覆后的惰性载体取出并在120℃条件下进行烘干,然后在600℃条件下进行焙烧,使得催化剂涂层固化在惰性载体上,即得到单层涂覆三元催化剂。
实施例三
一种单层涂覆三元催化剂的制备方法,包括以下步骤:
A、将活性组分Rh浸渍到氧化铝材料上得到Rh催化剂,然后进行烘干,再在900℃条件下进行焙烧,使得Rh在载体表面的分散与固化制得Rh催化剂粉体;将活性组分Rh浸渍到稀土氧化物材料上得到Pb催化剂,然后进行烘干,再在900℃条件下进行焙烧,使得Pb在载体表面的分散与固化制得粉状Pb催化剂,再加入适量去离子水制得Pb浆料;
B、将Rh催化剂粉体和Pb浆料进行充分混合,再经过球磨机球磨形成催化剂涂层浆料;
C、将惰性载体浸渍到催化剂涂层浆料中进行涂覆;
D、将经过催化剂涂覆后的惰性载体取出并在120℃条件下进行烘干,然后在900℃条件下进行焙烧,使得催化剂涂层固化在惰性载体上,即得到单层涂覆三元催化剂。
与现有技术的三元催化剂相比,在本发明的转化效率高于90%,其各项性能符合GB18352.3-2005《轻型汽车污染物排放限值及测量方法(中国Ⅲ、Ⅳ阶段)》。从催化效果来看,本发明的新鲜态活性测试较双层涂覆的催化剂表现出更好的催化活性,尤其是NOx的转化效率提升明显,老化后的催化剂活性也表现出与双层涂覆催化剂相当的活性。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (4)
1.一种单层涂覆三元催化剂的制备方法,其特征在于:包括以下步骤:
A、将Pd担载在氧化铝材料上制得Rh催化剂粉体,将Rh担载在稀土氧化物上制得Pb浆料;
B、将Rh催化剂粉体和Pb浆料进行充分混合,再经过球磨机球磨形成催化剂涂层浆料;
C、将惰性载体浸渍到催化剂涂层浆料中进行涂覆;
D、将经过催化剂涂覆后的惰性载体取出并进行烘干,然后进行焙烧,使得催化剂涂层固化在惰性载体上,即得到单层涂覆三元催化剂。
2.如权利要求1所述的一种单层涂覆三元催化剂的制备方法,其特征在于:所述步骤A中Rh催化剂粉体的制备过程为:将活性组分Rh浸渍到氧化铝材料上得到Rh催化剂,然后进行烘干,再在300~900℃条件下进行焙烧,使得Rh在载体表面的分散与固化制得Rh催化剂粉体。
3.如权利要求1所述的一种单层涂覆三元催化剂的制备方法,其特征在于:所述步骤A中Pb浆料的制备过程为:将活性组分Rh浸渍到稀土氧化物材料上得到Pb催化剂,然后进行烘干,再在300~900℃条件下进行焙烧,使得Pb在载体表面的分散与固化制得粉状Pb催化剂,再加入适量去离子水制得Pb浆料。
4.如权利要求1所述的一种单层涂覆三元催化剂的制备方法,其特征在于:步骤D中的烘干温度为120℃,焙烧温度为300~900℃。
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