CN110013875A - 一种氟改性分子筛fer的制备方法 - Google Patents
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- 239000002808 molecular sieve Substances 0.000 title claims abstract description 67
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 title claims abstract description 67
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910052731 fluorine Inorganic materials 0.000 title claims abstract description 29
- 239000011737 fluorine Substances 0.000 title claims abstract description 29
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- 238000002425 crystallisation Methods 0.000 claims abstract description 9
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- 239000002253 acid Substances 0.000 claims abstract description 5
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
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- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical group S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 10
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 10
- 229910052708 sodium Inorganic materials 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 229910052681 coesite Inorganic materials 0.000 claims description 8
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- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000004411 aluminium Substances 0.000 claims description 6
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
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- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
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Abstract
本发明公开了一种氟改性分子筛FER的制备方法,在水溶液中加入碱源,继续加入铝源、硅源和模板剂,搅拌混合均匀形成混合物胶体,再将混合物胶体晶化48h,抽滤,水洗,干燥,焙烧即得分子筛FER;将分子筛FER按固液比1g:50mL加入到0.1mol/L硝酸铵水溶液中,搅拌5h,抽滤,洗涤,干燥,焙烧,再将焙烧后的分子筛FER按固液比1g:20mL加入到0.02‑0.05mol/L改性剂水溶液中,搅拌5h直至分子筛FER与改性剂充分混合,静置,蒸干即制得目标产物氟改性分子筛FER。本发明制得的氟改性分子筛FER具有独特的孔道结构、适宜的酸性、良好的稳定性以及较大的比表面积等优点,在催化氯代甲烷制备丙烯的反应中催化性能变好且使用寿命变长。
Description
技术领域
本发明属于改性分子筛的制备技术领域,具体涉及一种氟改性分子筛FER的制备方法。
背景技术
丙烯可用于生产聚丙烯、环氧丙烷、丙酮、异丙醇、苯酚、甘油等重要化工产品,是现代社会经济发展不可或缺的化工生产原料,然而目前制备丙烯的效率较低,导致供不应求,因此需要开发高效的生产丙烯的方法。
目前卤代甲烷制备丙烯的生产路径已经相对成熟,卤代甲烷制备丙烯过程中需要分子筛催化剂,这种方法虽然提高了丙烯的产率,但由于分子筛催化剂的孔道结构、酸性等原因,使其容易失活,因此制备使用寿命较长、稳定性较好且催化性能较高的分子筛催化剂尤为重要。
发明内容
本发明解决的技术问题是提供了一种具有独特的孔道结构、适宜的酸性、良好的稳定性以及较大的比表面积的氟改性分子筛FER的制备方法。
本发明为解决上述技术问题采用如下技术方案,一种氟改性分子筛FER的制备方法,其特征在于具体步骤为:
步骤S1:在水溶液中加入碱源,继续加入铝源、硅源和模板剂,搅拌混合均匀形成混合物胶体,再将混合物胶体晶化48h,抽滤,水洗,干燥,焙烧即得分子筛FER,其中碱源为氢氧化钠,铝源为偏铝酸钠,硅源为硅溶胶,模板剂为吡咯烷;
步骤S2:将分子筛FER按固液比1g:50mL加入到0.1mol/L硝酸铵水溶液中,搅拌5h,抽滤,洗涤,干燥,焙烧,再将焙烧后的分子筛FER按固液比1g:20mL加入到0.02-0.05mol/L改性剂水溶液中,其中改性剂为氟化铵、氟硅酸或氟硅酸铵,搅拌5h直至分子筛FER与改性剂充分混合,静置,蒸干即制得目标产物氟改性分子筛FER。
优选的,步骤S1混合物胶体中各组分的摩尔比为n(Na2O):n(Al2O3):n(SiO2):n(H2O):n(吡咯烷)=1.56:1:50:600:18.96。
优选的,步骤S2改性剂水溶液为0.03mol/L氟化铵水溶液。
本发明所述的氟改性分子筛FER的制备方法,其特征在于具体步骤为:
步骤S1:在水溶液中加入碱源,继续加入铝源、硅源和模板剂,其中碱源为氢氧化钠,铝源为偏铝酸钠,硅源为硅溶胶,模板剂为吡咯烷,搅拌混合均匀形成混合物胶体,该混合物胶体中各组分的摩尔比为n(Na2O):n(Al2O3):n(SiO2):n(H2O):n(吡咯烷)=1.56:1:50:600:18.96,再将混合物胶体晶化48h,抽滤,水洗,干燥,焙烧即得分子筛FER;
步骤S2:将分子筛FER按固液比1g:50mL加入到0.1mol/L硝酸铵水溶液中,搅拌5h,抽滤,洗涤,干燥,焙烧,再将焙烧后的分子筛FER按固液比1g:20mL加入到0.03mol/L氟化铵水溶液中,搅拌5h直至分子筛FER和改性剂充分混合,静置,蒸干即制得目标产物氟改性分子筛FER;
该氟改性分子筛FER作为催化剂用于氯代甲烷制备丙烯的反应,其中氯代甲烷的转化率达到90%,丙烯的选择性达到40%,丙烯的收率达到36%,并且在12h内催化剂没有失活现象。
本发明相对于现有技术产生的有益效果是:本发明通过加入改性剂制得的氟改性分子筛FER具有独特的孔道结构、适宜的酸性、良好的稳定性以及较大的比表面积,是氯代甲烷制备丙烯反应中潜在的优异催化剂。除此之外还可以用于烃类的催化,应用范围广泛。在添加氟的基础上使得该分子筛稳定性提高,催化性能变好,使用寿命变长。未改性的FER作为催化剂在氯代甲烷制备丙烯的反应中,氯代甲烷的转化率为57%,丙烯的选择性为20%,丙烯的收率为11.4%;而氟改性分子筛FER作为催化剂在氯代甲烷制备丙烯的反应中,氯代甲烷的转化率可达90%,丙烯的选择性可达40%,丙烯的收率可达36%,并且在12h内催化剂没有失活现象。该方法具有工艺简便、生产效率高的优点。
具体实施方式
以下通过实施例对本发明的上述内容做进一步详细说明,但不应该将此理解为本发明上述主题的范围仅限于以下的实施例,凡基于本发明上述内容实现的技术均属于本发明的范围。
实施例1
在水溶液中加入碱源,继续加入铝源、硅源和模板剂,搅拌混合均匀形成混合物胶体,再将混合物胶体晶化48h,抽滤,水洗,干燥,焙烧即得分子筛FER,混合物胶体中各组分的摩尔比为n(Na2O):n(Al2O3):n(SiO2):n(H2O):n(吡咯烷)=1.56:1:50:600:18.96,铝源为偏铝酸钠,硅源为硅溶胶,碱源为氢氧化钠,模板剂为吡咯烷;
将分子筛FER按固液比1g:50mL加入到0.1mol/L硝酸铵水溶液中,搅拌5h,抽滤,洗涤,干燥,焙烧,再将焙烧后的分子筛FER按固液比1g:20mL加入到0.02mol/L氟化铵水溶液中,搅拌5h直至分子筛FER和改性剂充分混合,静置,蒸干即制得目标产物氟改性分子筛FER。
将实施例1制备的氟改性分子筛FER作为催化剂用于氯代甲烷制备丙烯的反应,其中氯代甲烷的转化率可达76%,丙烯的选择性可达24%,丙烯的收率可达18.24%,并且在6h内催化剂没有失活现象。
实施例2
在水溶液中加入碱源,继续加入铝源、硅源和模板剂,搅拌混合均匀形成混合物胶体,再将混合物胶体晶化48h,抽滤,水洗,干燥,焙烧即得分子筛FER,混合物胶体中各组分的摩尔比为n(Na2O):n(Al2O3):n(SiO2):n(H2O):n(吡咯烷)=1.56:1:50:600:18.96,铝源为偏铝酸钠,硅源为硅溶胶,碱源为氢氧化钠,模板剂为吡咯烷;
将分子筛FER按固液比1g:50mL加入到0.1mol/L硝酸铵水溶液中,搅拌5h,抽滤,洗涤,干燥,焙烧,再将焙烧后的分子筛FER按固液比1g:20mL加入到0.03mol/L氟化铵水溶液中,搅拌5h直至分子筛FER和改性剂充分混合,静置,蒸干即制得目标产物氟改性分子筛FER。
将实施例2制备的氟改性分子筛FER作为催化剂用于氯代甲烷制备丙烯的反应,其中氯代甲烷的转化率可达90%,丙烯的选择性可达40%,丙烯的收率可达36%,并且在12h内催化剂没有失活现象。
实施例3
在水溶液中加入碱源,继续加入铝源、硅源和模板剂,搅拌混合均匀形成混合物胶体,再将混合物胶体晶化48h,抽滤,水洗,干燥,焙烧即得分子筛FER,混合物胶体中各组分的摩尔比为n(Na2O):n(Al2O3):n(SiO2):n(H2O):n(吡咯烷)=1.56:1:50:600:18.96,铝源为偏铝酸钠,硅源为硅溶胶,碱源为氢氧化钠,模板剂为吡咯烷;
将分子筛FER按固液比1g:50mL加入到0.1mol/L硝酸铵水溶液中,搅拌5h,抽滤,洗涤,干燥,焙烧,再将焙烧后的分子筛FER按固液比1g:20mL加入到0.04mol/L氟化铵水溶液中,搅拌5h直至分子筛FER和改性剂充分混合,静置,蒸干即制得目标产物氟改性分子筛FER。
将实施例3制备的氟改性分子筛FER作为催化剂用于氯代甲烷制备丙烯的反应,其中氯代甲烷的转化率可达68%,丙烯的选择性可达45%,丙烯的收率可达30%,2h催化剂开始失活。
对比例1
在水溶液中加入碱源,继续加入铝源、硅源和模板剂,搅拌混合均匀形成混合物胶体,再将混合物胶体晶化48h,抽滤,水洗,干燥,焙烧即得分子筛FER,混合物胶体中各组分的摩尔比为n(Na2O):n(Al2O3):n(SiO2):n(H2O):n(吡咯烷)=1.56:1:50:600:18.96,铝源为偏铝酸钠,硅源为硅溶胶,碱源为氢氧化钠,模板剂为吡咯烷;将分子筛FER按固液比1g:50mL加入到0.1mol/L硝酸铵水溶液中,搅拌5h,抽滤,洗涤,干燥,焙烧得到分子筛FER。
将对比例1制备的分子筛FER作为催化剂用于氯代甲烷制备丙烯的反应,其中氯代甲烷的转化率为57%,丙烯的选择性为20%,丙烯的收率为11.4%,5h催化剂开始失活。
本发明实施例1-3制得了催化性能较好且使用寿命较长的氟改性分子筛FER,当改性剂溶液为0.03mmol/L的氟化铵水溶液时,所制备的氟改性分子筛FER催化性能最好,使用寿命最长,其作为催化剂在氯代甲烷制备丙烯的反应中,氯代甲烷的转化率可达90%,丙烯的选择性可达40%,丙烯的收率可达36%,并且在12h内催化剂没有失活现象。该方法工艺简单、方法便捷,具有良好的应用前景。
以上实施例描述了本发明的基本原理、主要特征及优点,本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明原理的范围下,本发明还会有各种变化和改进,这些变化和改进均落入本发明保护的范围内。
Claims (4)
1.一种氟改性分子筛FER的制备方法,其特征在于具体步骤为:
步骤S1:在水溶液中加入碱源,继续加入铝源、硅源和模板剂,搅拌混合均匀形成混合物胶体,再将混合物胶体晶化48h,抽滤,水洗,干燥,焙烧即得分子筛FER,其中碱源为氢氧化钠,铝源为偏铝酸钠,硅源为硅溶胶,模板剂为吡咯烷;
步骤S2:将分子筛FER按固液比1g:50mL加入到0.1mol/L硝酸铵水溶液中,搅拌5h,抽滤,洗涤,干燥,焙烧,再将焙烧后的分子筛FER按固液比1g:20mL加入到0.02-0.05mol/L改性剂水溶液中,其中改性剂为氟化铵、氟硅酸或氟硅酸铵,搅拌5h直至分子筛FER与改性剂充分混合,静置,蒸干即制得目标产物氟改性分子筛FER。
2.根据权利要求1所述的氟改性分子筛FER的制备方法,其特征在于:步骤S1中所述混合物胶体中各组分的摩尔比为n(Na2O):n(Al2O3):n(SiO2):n(H2O):n(吡咯烷)=1.56:1:50:600:18.96。
3.根据权利要求1所述的氟改性分子筛FER的制备方法,其特征在于:步骤S2改性剂水溶液为0.03mol/L氟化铵水溶液。
4.根据权利要求1所述的氟改性分子筛FER的制备方法,其特征在于具体步骤为:步骤S1:在水溶液中加入碱源,继续加入铝源、硅源和模板剂,其中碱源为氢氧化钠,铝源为偏铝酸钠,硅源为硅溶胶,模板剂为吡咯烷,搅拌混合均匀形成混合物胶体,该混合物胶体中各组分的摩尔比为n(Na2O):n(Al2O3):n(SiO2):n(H2O):n(吡咯烷)=1.56:1:50:600:18.96,再将混合物胶体晶化48h,抽滤,水洗,干燥,焙烧即得分子筛FER;
步骤S2:将分子筛FER按固液比1g:50mL加入到0.1mol/L硝酸铵水溶液中,搅拌5h,抽滤,洗涤,干燥,焙烧,再将焙烧后的分子筛FER按固液比1g:20mL加入到0.03mol/L氟化铵水溶液中,搅拌5h直至分子筛FER和改性剂充分混合,静置,蒸干即制得目标产物氟改性分子筛FER;
该氟改性分子筛FER作为催化剂用于氯代甲烷制备丙烯的反应,其中氯代甲烷的转化率达到90%,丙烯的选择性达到40%,丙烯的收率达到36%,并且在12h内催化剂没有失活现象。
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