CN110227465A - 二氧化碳甲烷化介孔催化剂的制备方法 - Google Patents
二氧化碳甲烷化介孔催化剂的制备方法 Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 48
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 50
- 235000019441 ethanol Nutrition 0.000 claims abstract description 20
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims abstract description 10
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- 239000002184 metal Substances 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 159000000013 aluminium salts Chemical class 0.000 claims abstract description 6
- 229910000329 aluminium sulfate Inorganic materials 0.000 claims abstract description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 3
- 239000011651 chromium Substances 0.000 claims abstract description 3
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 3
- 239000010941 cobalt Substances 0.000 claims abstract description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 3
- 150000002815 nickel Chemical class 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims abstract description 3
- -1 zirconates Chemical class 0.000 claims abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 17
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 239000004411 aluminium Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 5
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- 239000000243 solution Substances 0.000 description 17
- 229910052799 carbon Inorganic materials 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 229910052707 ruthenium Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910003286 Ni-Mn Inorganic materials 0.000 description 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
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- 238000006731 degradation reaction Methods 0.000 description 1
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- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
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- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/755—Nickel
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- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
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Abstract
本发明涉及一种二氧化碳甲烷化介孔催化剂的制备方法,包括如下步骤:S1:将铝盐、锆盐、镍盐以及第二活性金属溶于乙醇中,超声溶解形成溶液Ι,其中第二活性金属为铁、钴、锰、铬中的任意一种;S2:搅拌溶液Ι,在搅拌的同时向溶液Ι中滴加环氧丙烷形成溶胶;S3:将溶胶放于室温下陈化,形成凝胶;S4:将所得凝胶用乙醇洗涤、离心,之后进行烘干,最后放于500‑600℃下焙烧4.5‑5.5小时,即二氧化碳甲烷化介孔催化剂粉末。本发明的制备方法简单,易操作,合成介孔材料过程中未使用昂贵的模板剂或表面活性剂,所用原料均价格低廉、方便易得,且制得的催化剂在二氧化碳甲烷化反应中表现出优异的低温催化活性和稳定性。
Description
技术领域
本发明涉及催化剂的技术领域,具体涉及一种二氧化碳甲烷化介孔催化剂的制备方法。
背景技术
随着石油、煤炭等不可再生能源的日益枯竭,加上大气中温室气体浓度上升带来的环境恶化,将温室气体二氧化碳转化为高附加值的化工产品成为国内外学术界研究的热点。其中,利用二氧化碳加氢合成甲烷,不仅可以降低大气中二氧化碳的浓度,制得的甲烷还可作为燃料,可以在一定程度上缓解能源问题。此外,甲烷也是常用的化工原料,可进一步用于制取乙炔、合成氨等化工产品。因此,开发一种高效的二氧化碳甲烷化催化剂具有较大的现实意义。
在常见的甲烷化催化剂中,大部分是以过渡金属镍、钌、铑、钯等为活性组分,负载于氧化物载体如氧化铝、氧化锆、氧化硅之上。其中,贵金属钌、铑、钯制得的催化剂具有较强的催化活性,但价格昂贵,无法大规模应用于工业制备过程中。相较之下,以镍为活性相的催化剂具有更好的应用前景。Ni/Al2O3是二氧化碳甲烷化中最常用的催化剂,具有活性好、价格低廉的优势。但镍基催化剂在反应过程中容易烧结,高温反应下容易生成积碳,导致无法长时间稳定工作,且低温反应活性较差导致能耗较高。因此,对镍基氧化铝催化剂进行改性,通过合理设计催化剂结构、添加助剂等方式改善催化剂的性能,制备出一种具备低温活性、抗烧结、抗积碳的甲烷化催化剂是行业内的一个重要研究热点。
发明内容
本发明的目的在于提供一种二氧化碳甲烷化介孔催化剂的制备方法,该制备方法制备出的复合载体催化剂在改善催化剂低温反应性能的同时,提升了催化剂的抗烧结、抗积碳性能。
本发明解决上述技术问题所采用的方案是:
一种二氧化碳甲烷化介孔催化剂的制备方法,包括如下步骤:
S1:将铝盐、锆盐、镍盐以及第二活性金属溶于乙醇中,超声溶解形成溶液Ι,其中第二活性金属为铁、钴、锰、铬中的任意一种;
S2:搅拌溶液Ι,在搅拌的同时向溶液Ι中滴加环氧丙烷形成溶胶;
S3:将上述溶胶放于室温下陈化,形成凝胶;
S4:将所得凝胶用乙醇洗涤、离心,之后进行烘干,最后放于500-600℃下焙烧4.5-5.5小时,即二氧化碳甲烷化介孔催化剂粉末。
进一步地,镍的负载量占催化剂总质量的1wt.%-30wt.%。
进一步地,铝盐和锆盐中铝元素和锆元素的摩尔比为0.4-10:1。
进一步地,镍元素与第二活性金属元素的摩尔比为1.0-6.0:1。
本发明还提供一种根据上述的二氧化碳甲烷化介孔催化剂的制备方法所制得的催化剂。
与现有技术相比,本发明至少具有以下有益效果:本发明使用铝盐和锆盐为载体,镍以及第二活性金属为活性成分,采用一步法合成了介孔Ni-Mn/Al2O3-ZrO2复合载体催化剂,该制备方法简单,反应条件温和易操作,合成介孔材料过程中未使用昂贵的模板剂或表面活性剂,所用原料均价格低廉、方便易得;根据本发明的方法制得的催化剂具有孔径集中的介孔结构,且比表面积较大,能明显提升催化剂的低温反应性能,同时也能提高催化剂的抗烧结、抗积碳性能,为CO2甲烷化反应体系提供了一种具有较大潜在应用价值的催化剂。
具体实施方式
为更好的理解本发明,下面的实施例是对本发明的进一步说明,但本发明的内容不仅仅局限于下面的实施例。
实施例1:样品制备
(1)称取1.99gFe(NO3)3·9H2O、8.58gZr(NO3)4·5H2O、7.50gAl(NO3)3·9H2O以及4.30gNi(NO3)2·6H2O共同溶于60mL乙醇中,借助超声溶解形成溶液1;(2)剧烈搅拌的同时,往溶液1中滴加30mL环氧丙烷,一段时间后形成透明溶胶;(3)将溶胶置于常温下陈化48小时,形成凝胶;(4)将所得凝胶用乙醇洗涤、离心,再放入烘箱中80℃烘干48小时,最后放入马弗炉中于550℃焙烧5小时,得到催化剂1。
实施例2:样品制备
(1)称取1.43gCo(NO3)2·6H2O、8.58gZr(NO3)4·5H2O、7.50gAl(NO3)3·9H2O以及4.30gNi(NO3)2·6H2O共同溶于60mL乙醇中,借助超声溶解形成溶液1;(2)剧烈搅拌的同时,往溶液1中滴加30mL环氧丙烷,一段时间后形成透明溶胶;(3)将溶胶置于常温下陈化48小时,形成凝胶;(4)将所得凝胶用乙醇洗涤、离心,再放入烘箱中80℃烘干48小时,最后放入马弗炉中于550℃焙烧5小时,得到催化剂2。
实施例3:样品制备
(1)称取1.97gCr(NO3)3·9H2O、8.58gZr(NO3)4·5H2O、7.50gAl(NO3)3·9H2O以及4.30gNi(NO3)2·6H2O共同溶于60mL乙醇中,借助超声溶解形成溶液1;(2)剧烈搅拌的同时,往溶液1中滴加30mL环氧丙烷,一段时间后形成透明溶胶;(3)将溶胶置于常温下陈化48小时,形成凝胶;(4)将所得凝胶用乙醇洗涤、离心,再放入烘箱中80℃烘干48小时,最后放入马弗炉中于550℃焙烧5小时,得到催化剂3。
实施例4:样品制备
(1)称取0.89gMn(NO3)2(50%水溶液)、8.58gZr(NO3)4·5H2O、7.50gAl(NO3)3·9H2O以及4.30gNi(NO3)2·6H2O共同溶于60mL乙醇中,借助超声溶解形成溶液1;(2)剧烈搅拌的同时,往溶液1中滴加30mL环氧丙烷,一段时间后形成透明溶胶;(3)将溶胶置于常温下陈化48小时,形成凝胶;(4)将所得凝胶用乙醇洗涤、离心,再放入烘箱中80℃烘干48小时,最后放入马弗炉中于550℃焙烧5小时,得到催化剂4。
实施例5:样品制备
(1)称取1.78gMn(NO3)2(50%水溶液)、8.58gZr(NO3)4·5H2O、7.50gAl(NO3)3·9H2O以及4.30gNi(NO3)2·6H2O共同溶于60mL乙醇中,借助超声溶解形成溶液1;(2)剧烈搅拌的同时,往溶液1中滴加30mL环氧丙烷,一段时间后形成透明溶胶;(3)将溶胶置于常温下陈化48小时,形成凝胶;(4)将所得凝胶用乙醇洗涤、离心,再放入烘箱中80℃烘干48小时,最后放入马弗炉中于550℃焙烧5小时,得到催化剂5。
实施例6:样品制备
(1)称取5.29gMn(NO3)2(50%水溶液)、8.58gZr(NO3)4·5H2O、7.50gAl(NO3)3·9H2O以及4.30gNi(NO3)2·6H2O共同溶于60mL乙醇中,借助超声溶解形成溶液1;(2)剧烈搅拌的同时,往溶液1中滴加30mL环氧丙烷,一段时间后形成透明溶胶;(3)将溶胶置于常温下陈化48小时,形成凝胶;(4)将所得凝胶用乙醇洗涤、离心,再放入烘箱中80℃烘干48小时,最后放入马弗炉中于550℃焙烧5小时,得到催化剂6。
实施例7:对比样制备
(1)称取15gAl(NO3)3·9H2O以及4.30gNi(NO3)2·6H2O共同溶于60mL乙醇中,借助超声溶解形成溶液1;(2)剧烈搅拌的同时,往溶液1中滴加30mL环氧丙烷,一段时间后形成透明溶胶;(3)将溶胶置于常温下陈化48小时,形成凝胶;(4)将所得凝胶用乙醇洗涤、离心,再放入烘箱中80℃烘干48小时,最后放入马弗炉中于550℃焙烧5小时,得到催化剂7。
实施例8:样品评价
将1-7号催化剂分别转入固定床反应器中,评价条件为:空速6000h-1,压力0.1MPa,反应温度160℃-460℃,原料气H2/CO2=4。评价结果如表1所示,列出了催化剂在320℃较低温度下的CO2转化率及CH4选择性。
催化剂编号 | CO<sub>2</sub>转化率(%) | CH<sub>4</sub>选择性(%) |
1 | 75.2 | 99.9 |
2 | 76.9 | 99.9 |
3 | 75.1 | 99.8 |
4 | 75.4 | 99.9 |
5 | 78.2 | 99.9 |
6 | 78.3 | 99.9 |
对比样 | 49.7 | 99.3 |
从表1中可以看到,添加了第二金属的1-6号复合载体催化剂相对于Ni/Al2O3对比样,具有更高的CO2转化率和CH4选择性,其中CO2转化率的提升尤为明显。
以上所述是本发明的优选实施方式而已,当然不能以此来限定本发明之权利范围,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和变动,这些改进和变动也视为本发明的保护范围。
Claims (5)
1.一种二氧化碳甲烷化介孔催化剂的制备方法,其特征在于,包括如下步骤:
S1:将铝盐、锆盐、镍盐以及第二活性金属溶于乙醇中,超声溶解形成溶液Ι,其中第二活性金属为铁、钴、锰、铬中的任意一种;
S2:搅拌溶液Ι,在搅拌的同时向溶液Ι中滴加环氧丙烷形成溶胶;
S3:将上述溶胶放于室温下陈化,形成凝胶;
S4:将所得凝胶用乙醇洗涤、离心,之后进行烘干,最后放于500-600℃下焙烧4.5-5.5小时,即二氧化碳甲烷化介孔催化剂粉末。
2.根据权利要求1所述的二氧化碳甲烷化介孔催化剂的制备方法,其特征在于,镍的负载量占催化剂总质量的1wt.%-30wt.%。
3.根据权利要求1所述的二氧化碳甲烷化介孔催化剂的制备方法,其特征在于,铝盐和锆盐中铝元素和锆元素的摩尔比为0.4-10:1。
4.根据权利要求1所述的二氧化碳甲烷化介孔催化剂的制备方法,其特征在于,镍元素与第二活性金属元素的摩尔比为1.0-6.0:1。
5.一种根据权利要求1-4任意一项所述的二氧化碳甲烷化介孔催化剂的制备方法所制得的催化剂。
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